Merge branch 'hotfix/sangshuduo/fix-issue-getenv-return-unknown-size' into coverity_scan

2020-09-10 14:19:12 +08:00 · 2020-09-10 14:19:12 +08:00 · 390429aaea
parent b2c3e10385 ae20e56239
commit 390429aaea
156 changed files with 2385 additions and 910 deletions
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -13,6 +13,8 @@ ENDIF ()
 SET(TD_ACCOUNT FALSE)
 SET(TD_ADMIN FALSE)
 SET(TD_GRANT FALSE)
+SET(TD_SYNC TRUE)
+SET(TD_MQTT TRUE)
 SET(TD_TSDB_PLUGINS FALSE)

 SET(TD_COVER FALSE)
--- a/README.md
+++ b/README.md
@ -3,6 +3,7 @@
 [![Coverage Status](https://coveralls.io/repos/github/taosdata/TDengine/badge.svg?branch=develop)](https://coveralls.io/github/taosdata/TDengine?branch=develop)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/4201/badge)](https://bestpractices.coreinfrastructure.org/projects/4201)
 [![Docker Pulls](https://img.shields.io/docker/pulls/tdengine/tdengine)](https://hub.docker.com/repository/docker/tdengine/tdengine)
+[![tdengine](https://snapcraft.io//tdengine/badge.svg)](https://snapcraft.io/tdengine)

 [![TDengine](TDenginelogo.png)](https://www.taosdata.com)

--- a/alert/app/rule.go
+++ b/alert/app/rule.go
@ -121,7 +121,21 @@ func (alert *Alert) refresh(rule *Rule, values map[string]interface{}) {
 	alert.Values = values
 	res := rule.Expr.Eval(func(key string) interface{} {
 		// ToLower is required as column name in result is in lower case
-		return alert.Values[strings.ToLower(key)]
+		i := alert.Values[strings.ToLower(key)]
+		switch v := i.(type) {
+		case int8:
+			return int64(v)
+		case int16:
+			return int64(v)
+		case int:
+			return int64(v)
+		case int32:
+			return int64(v)
+		case float32:
+			return float64(v)
+		default:
+			return v
+		}
 	})

 	val, ok := res.(bool)
--- a/cmake/define.inc
+++ b/cmake/define.inc
@ -13,6 +13,14 @@ IF (TD_GRANT)
  ADD_DEFINITIONS(-D_GRANT)
 ENDIF ()

+IF (TD_SYNC)
+  ADD_DEFINITIONS(-D_SYNC)
+ENDIF ()
+
+IF (TD_MQTT)
+  ADD_DEFINITIONS(-D_MQTT)
+ENDIF ()
+
 IF (TD_TSDB_PLUGINS)
  ADD_DEFINITIONS(-D_TSDB_PLUGINS)
 ENDIF ()
--- a/cmake/input.inc
+++ b/cmake/input.inc
@ -42,6 +42,16 @@ IF (${MEM_CHECK} MATCHES "true")
  MESSAGE(STATUS "build with memory check")
 ENDIF ()

+IF (${MQTT} MATCHES "false")
+  SET(TD_MQTT FALSE)
+  MESSAGE(STATUS "build without mqtt module")
+ENDIF ()
+
+IF (${SYNC} MATCHES "false")
+  SET(TD_SYNC FALSE)
+  MESSAGE(STATUS "build without sync module")
+ENDIF ()
+
 IF (${RANDOM_FILE_FAIL} MATCHES "true")
  SET(TD_RANDOM_FILE_FAIL TRUE)
  MESSAGE(STATUS "build with random-file-fail enabled")
--- a/deps/CMakeLists.txt
+++ b/deps/CMakeLists.txt
@ -10,6 +10,6 @@ ADD_SUBDIRECTORY(cJson)
 ADD_SUBDIRECTORY(wepoll)
 ADD_SUBDIRECTORY(MsvcLibX)

-IF (TD_LINUX)
+IF (TD_LINUX AND TD_MQTT)
  ADD_SUBDIRECTORY(MQTT-C)
 ENDIF ()
--- a/deps/MQTT-C/CMakeLists.txt
+++ b/deps/MQTT-C/CMakeLists.txt
@ -1,5 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
-project(MQTT-C VERSION 1.1.2 LANGUAGES C)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8)

 # MQTT-C build options
 option(MQTT_C_OpenSSL_SUPPORT "Build MQTT-C with OpenSSL support?" OFF)
--- a/documentation/webdocs/markdowndocs/administrator-ch.md
+++ b/documentation/webdocs/markdowndocs/administrator-ch.md
@ -128,24 +128,84 @@ TDengine集群中加入一个新的dnode时，涉及集群相关的一些参数
 - maxTablesPerVnode: 每个vnode中能够创建的最大表个数。默认值：1000000。
 - maxVgroupsPerDb: 每个数据库中能够使用的最大vnode个数。
 - arbitrator: 系统中裁决器的end point，缺省为空
- timezone：时区。从系统中动态获取当前的时区设置。
- locale：系统区位信息及编码格式。系统中动态获取，如果自动获取失败，需要用户在配置文件设置或通过API设置。
- charset：字符集编码。系统中动态获取，如果自动获取失败，需要用户在配置文件设置或通过API设置。
+- timezone、locale、charset 的配置见客户端配置。

 ## 客户端配置 

-TDengine系统的前台交互客户端应用程序为taos，它与taosd共享同一个配置文件taos.cfg。运行taos时，使用参数-c指定配置文件目录，如taos -c /home/cfg，表示使用/home/cfg/目录下的taos.cfg配置文件中的参数，缺省目录是/etc/taos。更多taos的使用方法请见[Shell命令行程序](#_TDengine_Shell命令行程序)。本节主要讲解taos客户端应用在配置文件taos.cfg文件中使用到的参数。
+TDengine系统的前台交互客户端应用程序为taos，它与taosd共享同一个配置文件taos.cfg。运行taos时，使用参数-c指定配置文件目录，如taos -c /home/cfg，表示使用/home/cfg/目录下的taos.cfg配置文件中的参数，缺省目录是/etc/taos。本节主要说明 taos 客户端应用在配置文件 taos.cfg 文件中使用到的参数。

 客户端配置参数列表及解释

 - firstEp: taos启动时，主动连接的集群中第一个taosd实例的end point, 缺省值为 localhost:6030。
 - secondEp: taos启动时，如果first连接不上，尝试连接集群中第二个taosd实例的end point, 缺省值为空。
- charset：字符集编码。系统中动态获取，如果自动获取失败，需要用户在配置文件设置或通过API设置。
- locale：系统区位信息及编码格式。系统中动态获取，如果自动获取失败，需要用户在配置文件设置或通过API设置。

-日志的配置参数，与server的配置参数完全一样。
+- locale

-启动taos时，也可以从命令行指定一个taosd实例的end point，否则就从taos.cfg读取。
+    > 默认值：系统中动态获取，如果自动获取失败，需要用户在配置文件设置或通过API设置
+
+TDengine为存储中文、日文、韩文等非ASCII编码的宽字符，提供一种专门的字段类型nchar。写入nchar字段的数据将统一采用UCS4-LE格式进行编码并发送到服务器。需要注意的是，编码正确性是客户端来保证。因此，如果用户想要正常使用nchar字段来存储诸如中文、日文、韩文等非ASCII字符，需要正确设置客户端的编码格式。
+
+客户端的输入的字符均采用操作系统当前默认的编码格式，在Linux系统上多为UTF-8，部分中文系统编码则可能是GB18030或GBK等。在docker环境中默认的编码是POSIX。在中文版Windows系统中，编码则是CP936。客户端需要确保正确设置自己所使用的字符集，即客户端运行的操作系统当前编码字符集，才能保证nchar中的数据正确转换为UCS4-LE编码格式。
+
+在 Linux 中 locale 的命名规则为: <语言>_<地区>.<字符集编码> 如：zh_CN.UTF-8，zh代表中文，CN代表大陆地区，UTF-8表示字符集。字符集编码为客户端正确解析本地字符串提供编码转换的说明。Linux系统与 Mac OSX 系统可以通过设置locale来确定系统的字符编码，由于Windows使用的locale中不是POSIX标准的locale格式，因此在Windows下需要采用另一个配置参数charset来指定字符编码。在Linux 系统中也可以使用charset来指定字符编码。
+
+- charset
+
+    > 默认值：系统中动态获取，如果自动获取失败，需要用户在配置文件设置或通过API设置
+
+如果配置文件中不设置charset，在Linux系统中，taos在启动时候，自动读取系统当前的locale信息，并从locale信息中解析提取charset编码格式。如果自动读取locale信息失败，则尝试读取charset配置，如果读取charset配置也失败，则中断启动过程。
+
+在Linux系统中，locale信息包含了字符编码信息，因此正确设置了Linux系统locale以后可以不用再单独设置charset。例如：
+```
+    locale zh_CN.UTF-8
+```
+在Windows系统中，无法从locale获取系统当前编码。如果无法从配置文件中读取字符串编码信息，taos默认设置为字符编码为CP936。其等效在配置文件中添加如下配置：
+```
+    charset CP936
+```
+如果需要调整字符编码，请查阅当前操作系统使用的编码，并在配置文件中正确设置。
+
+在Linux系统中，如果用户同时设置了locale和字符集编码charset，并且locale和charset的不一致，后设置的值将覆盖前面设置的值。
+```
+    locale zh_CN.UTF-8
+    charset GBK
+```
+则charset的有效值是GBK。
+```
+    charset GBK
+    locale zh_CN.UTF-8
+```
+charset的有效值是UTF-8。
+
+日志的配置参数，与server 的配置参数完全一样。
+
+- timezone
+
+    默认值：从系统中动态获取当前的时区设置
+
+客户端运行系统所在的时区。为应对多时区的数据写入和查询问题，TDengine 采用 Unix 时间戳(Unix Timestamp)来记录和存储时间戳。Unix 时间戳的特点决定了任一时刻不论在任何时区，产生的时间戳均一致。需要注意的是，Unix时间戳是在客户端完成转换和记录。为了确保客户端其他形式的时间转换为正确的 Unix 时间戳，需要设置正确的时区。
+
+在Linux系统中，客户端会自动读取系统设置的时区信息。用户也可以采用多种方式在配置文件设置时区。例如：
+```
+    timezone UTC-8
+    timezone GMT-8
+    timezone Asia/Shanghai
+```
+均是合法的设置东八区时区的格式。
+
+时区的设置对于查询和写入SQL语句中非Unix时间戳的内容（时间戳字符串、关键词now的解析）产生影响。例如：
+```
+    SELECT count(*) FROM table_name WHERE TS<'2019-04-11 12:01:08';
+```
+在东八区，SQL语句等效于
+```
+    SELECT count(*) FROM table_name WHERE TS<1554955268000;
+```
+在UTC时区，SQL语句等效于
+```
+    SELECT count(*) FROM table_name WHERE TS<1554984068000;
+```
+为了避免使用字符串时间格式带来的不确定性，也可以直接使用Unix时间戳。此外，还可以在SQL语句中使用带有时区的时间戳字符串，例如：RFC3339格式的时间戳字符串，2013-04-12T15:52:01.123+08:00或者ISO-8601格式时间戳字符串2013-04-12T15:52:01.123+0800。上述两个字符串转化为Unix时间戳不受系统所在时区的影响。

 ## 用户管理

--- a/documentation20/webdocs/markdowndocs/Documentation-ch.md
+++ b/documentation20/webdocs/markdowndocs/Documentation-ch.md
@ -95,6 +95,8 @@ TDengine是一个高效的存储、查询、分析时序大数据的平台，专
 - [数据查询](https://www.taosdata.com/cn/documentation20/taos-sql/#数据查询)：支持时间段、值过滤、排序、查询结果手动分页等
 - [SQL函数](https://www.taosdata.com/cn/documentation20/taos-sql/#SQL函数)：支持各种聚合函数、选择函数、计算函数，如avg, min, diff等
 - [时间维度聚合](https://www.taosdata.com/cn/documentation20/taos-sql/#时间维度聚合)：将表中数据按照时间段进行切割后聚合，降维处理
+- [边界线制](https://www.taosdata.com/cn/documentation20/taos-sql/#TAOS-SQL-边界限制)：TAOS SQL的边界限制
+- [错误码](https://www.taosdata.com/cn/documentation20/Taos-Error-Code)：TDengine 2.0 错误码以及对应的十进制码

 ## TDengine的技术设计

--- a/documentation20/webdocs/markdowndocs/TAOS
+++ b/documentation20/webdocs/markdowndocs/TAOS
@ -86,13 +86,29 @@ TDengine缺省的时间戳是毫秒精度，但通过修改配置参数enableMic
    ```mysql
    ALTER DATABASE db_name COMP 2;
    ```
-    修改数据库文件压缩标志位，有效数字为0，1，2. 0表示不压缩，1表示一阶段压缩，2表示两阶段压缩。修改后可以使用show databases命令查看是否修改成功
+    COMP参数是指修改数据库文件压缩标志位，取值范围为[0, 2]. 0表示不压缩，1表示一阶段压缩，2表示两阶段压缩。

    ```mysql
    ALTER DATABASE db_name REPLICA 2;
    ```
-    修改数据库副本数，有效副本数为1到3。在集群中使用，副本数必须小于dnode的数目。修改后可以使用show databases命令查看是否修改成功
+    REPLICA参数是指修改数据库副本数，取值范围[1, 3]。在集群中使用，副本数必须小于dnode的数目。

+    ```mysql
+    ALTER DATABASE db_name KEEP 365;
+    ```
+    KEEP参数是指修改数据文件保存的天数，缺省值为3650，取值范围[days, 365000]，必须大于或等于days参数值。
+
+    ```mysql
+    ALTER DATABASE db_name QUORUM 365;
+    ```
+    QUORUM参数是指数据写入成功所需要的确认数。取值范围[1, 3]。对于异步复制，quorum设为1，具有master角色的虚拟节点自己确认即可。对于同步复制，需要至少大于等于2。原则上，Quorum >=1 并且 Quorum <= replica(副本数)，这个参数在启动一个同步模块实例时需要提供。
+
+    ```mysql
+    ALTER DATABASE db_name BLOCKS 365;
+    ```
+    BLOCKS参数是每个VNODE (TSDB) 中有多少cache大小的内存块，因此一个VNODE的用的内存大小粗略为（cache * blocks）。取值范围[3, 1000]。
+
+    **Tips**: 以上所有参数修改后都可以用show databases来确认是否修改成功。

 - **显示系统所有数据库**
    ```mysql
--- a/documentation20/webdocs/markdowndocs/Taos
+++ b/documentation20/webdocs/markdowndocs/Taos
@ -0,0 +1,173 @@
+# TDengine 2.0 错误码以及对应的十进制码
+
+
+| Code                  |  bit  |   error code |  错误描述                  | 十进制错误码       |
+|-----------------------| :---: | :---------:  | :------------------------ | ---------------- |
+|TSDB_CODE_RPC_ACTION_IN_PROGRESS|	0	| 0x0001|	 "Action in progress"|	-2147483647|
+|TSDB_CODE_RPC_AUTH_REQUIRED|	0	| 0x0002	| "Authentication required"|	-2147483646|
+|TSDB_CODE_RPC_AUTH_FAILURE|	0|	 0x0003	| "Authentication failure"|	-2147483645|
+|TSDB_CODE_RPC_REDIRECT	|0	| 0x0004|	 "Redirect"|	-2147483644|
+|TSDB_CODE_RPC_NOT_READY|	0	| 0x0005	| "System not ready"|	-2147483643|
+|TSDB_CODE_RPC_ALREADY_PROCESSED|	0	| 0x0006	 |"Message already processed"|	-2147483642|
+|TSDB_CODE_RPC_LAST_SESSION_NOT_FINISHED|	0	 |0x0007|	 "Last session not finished"|	-2147483641|
+|TSDB_CODE_RPC_MISMATCHED_LINK_ID|	0|	 0x0008	| "Mismatched meter id"|	-2147483640|
+|TSDB_CODE_RPC_TOO_SLOW|	0	| 0x0009	| "Processing of request timed out"|	-2147483639|
+|TSDB_CODE_RPC_MAX_SESSIONS|	0	| 0x000A	| "Number of sessions reached limit"|	-2147483638|
+|TSDB_CODE_RPC_NETWORK_UNAVAIL|	0	 |0x000B	| "Unable to establish connection"	|-2147483637|
+|TSDB_CODE_RPC_APP_ERROR|	0|	 0x000C	| "Unexpected generic error in RPC"|	-2147483636|
+|TSDB_CODE_RPC_UNEXPECTED_RESPONSE|	0	 |0x000D	| "Unexpected response"|	-2147483635|
+|TSDB_CODE_RPC_INVALID_VALUE|	0	| 0x000E	| "Invalid value"|	-2147483634|
+|TSDB_CODE_RPC_INVALID_TRAN_ID|	0	| 0x000F	| "Invalid transaction id"|	-2147483633|
+|TSDB_CODE_RPC_INVALID_SESSION_ID|	0|	 0x0010	| "Invalid session id"|	-2147483632|
+|TSDB_CODE_RPC_INVALID_MSG_TYPE|	0|	 0x0011|	 "Invalid message type"|	-2147483631|
+|TSDB_CODE_RPC_INVALID_RESPONSE_TYPE|	0	| 0x0012|	 "Invalid response type"|	-2147483630|
+|TSDB_CODE_RPC_INVALID_TIME_STAMP|	0|	 0x0013|	 "Invalid timestamp"|	-2147483629|
+|TSDB_CODE_COM_OPS_NOT_SUPPORT|	0	| 0x0100|	 "Operation not supported"|	-2147483392|
+|TSDB_CODE_COM_MEMORY_CORRUPTED	|0|	 0x0101	| "Memory corrupted"|	-2147483391|
+|TSDB_CODE_COM_OUT_OF_MEMORY|	0|	 0x0102|	 "Out of memory"|	-2147483390|
+|TSDB_CODE_COM_INVALID_CFG_MSG|	0	| 0x0103|	 "Invalid config message"|	-2147483389|
+|TSDB_CODE_COM_FILE_CORRUPTED|	0|	 0x0104|	 "Data file corrupted"	|-2147483388|
+|TSDB_CODE_TSC_INVALID_SQL|	0|	 0x0200	| "Invalid SQL statement"|	-2147483136|
+|TSDB_CODE_TSC_INVALID_QHANDLE|	0	| 0x0201	| "Invalid qhandle"|	-2147483135|
+|TSDB_CODE_TSC_INVALID_TIME_STAMP|	0	| 0x0202	| "Invalid combination of client/service time"|	-2147483134|
+|TSDB_CODE_TSC_INVALID_VALUE|	0	| 0x0203|	 "Invalid value in client"|	-2147483133|
+|TSDB_CODE_TSC_INVALID_VERSION|	0	| 0x0204	| "Invalid client version"	|-2147483132|
+|TSDB_CODE_TSC_INVALID_IE|	0	| 0x0205	| "Invalid client ie"	|-2147483131|
+|TSDB_CODE_TSC_INVALID_FQDN|	0	| 0x0206|	 "Invalid host name"|	-2147483130|
+|TSDB_CODE_TSC_INVALID_USER_LENGTH|	0	| 0x0207|	 "Invalid user name"|	-2147483129|
+|TSDB_CODE_TSC_INVALID_PASS_LENGTH|	0	| 0x0208	| "Invalid password"|	-2147483128|
+|TSDB_CODE_TSC_INVALID_DB_LENGTH|	0	| 0x0209|	 "Database name too long"|	-2147483127|
+|TSDB_CODE_TSC_INVALID_TABLE_ID_LENGTH|	0	| 0x020A	| "Table name too long"|	-2147483126|
+|TSDB_CODE_TSC_INVALID_CONNECTION|	0	| 0x020B|	 "Invalid connection"|	-2147483125|
+|TSDB_CODE_TSC_OUT_OF_MEMORY|	0	| 0x020C	| "System out of memory"	|-2147483124|
+|TSDB_CODE_TSC_NO_DISKSPACE|	0	| 0x020D	| "System out of disk space"|	-2147483123|
+|TSDB_CODE_TSC_QUERY_CACHE_ERASED|	0	| 0x020E|	 "Query cache erased"|	-2147483122|
+|TSDB_CODE_TSC_QUERY_CANCELLED|	0	| 0x020F	 |"Query terminated"|	-2147483121|
+|TSDB_CODE_TSC_SORTED_RES_TOO_MANY|	0	 |0x0210	| "Result set too large to be sorted"|	-2147483120|
+|TSDB_CODE_TSC_APP_ERROR|	0	| 0x0211	| "Application error"|	-2147483119|
+|TSDB_CODE_TSC_ACTION_IN_PROGRESS|	0	 |0x0212	| "Action in progress"|	-2147483118|
+|TSDB_CODE_TSC_DISCONNECTED|	0	| 0x0213	 |"Disconnected from service"	|-2147483117|
+|TSDB_CODE_TSC_NO_WRITE_AUTH|	0	| 0x0214	| "No write permission"	|-2147483116|
+|TSDB_CODE_MND_MSG_NOT_PROCESSED|	0|	 0x0300|	 "Message not processed"|	-2147482880|
+|TSDB_CODE_MND_ACTION_IN_PROGRESS|	0	| 0x0301	 |"Message is progressing"|	-2147482879|
+|TSDB_CODE_MND_ACTION_NEED_REPROCESSED|	0	| 0x0302	 |"Messag need to be reprocessed"|	-2147482878|
+|TSDB_CODE_MND_NO_RIGHTS|	0	| 0x0303|	 "Insufficient privilege for operation"|	-2147482877|
+|TSDB_CODE_MND_APP_ERROR|	0	| 0x0304	| "Unexpected generic error in mnode"|	-2147482876|
+|TSDB_CODE_MND_INVALID_CONNECTION|	0	| 0x0305	| "Invalid message connection"|	-2147482875|
+|TSDB_CODE_MND_INVALID_MSG_VERSION|	0	| 0x0306	| "Incompatible protocol version"|	-2147482874|
+|TSDB_CODE_MND_INVALID_MSG_LEN|	0|	 0x0307	| "Invalid message length"|	-2147482873|
+|TSDB_CODE_MND_INVALID_MSG_TYPE|	0	| 0x0308	| "Invalid message type"	|-2147482872|
+|TSDB_CODE_MND_TOO_MANY_SHELL_CONNS|	0	 |0x0309	| "Too many connections"|	-2147482871|
+|TSDB_CODE_MND_OUT_OF_MEMORY|	0	 |0x030A	| "Out of memory in mnode"|	-2147482870|
+|TSDB_CODE_MND_INVALID_SHOWOBJ|	0	| 0x030B	 |"Data expired"|	-2147482869|
+|TSDB_CODE_MND_INVALID_QUERY_ID	|0	| 0x030C	 |"Invalid query id"	|-2147482868|
+|TSDB_CODE_MND_INVALID_STREAM_ID|	0	 |0x030D	| "Invalid stream id"|	-2147482867|
+|TSDB_CODE_MND_INVALID_CONN_ID|	0|	 0x030E	| "Invalid connection id"	|-2147482866|
+|TSDB_CODE_MND_SDB_OBJ_ALREADY_THERE|	0	| 0x0320|	 "Object already there"|	-2147482848|
+|TSDB_CODE_MND_SDB_ERROR|	0	 |0x0321	| "Unexpected generic error in sdb"	|-2147482847|
+|TSDB_CODE_MND_SDB_INVALID_TABLE_TYPE|	0	| 0x0322|	 "Invalid table type"	|-2147482846|
+|TSDB_CODE_MND_SDB_OBJ_NOT_THERE|	0	| 0x0323	 |"Object not there"	|-2147482845|
+|TSDB_CODE_MND_SDB_INVAID_META_ROW|	0	| 0x0324|	 "Invalid meta row"	|-2147482844|
+|TSDB_CODE_MND_SDB_INVAID_KEY_TYPE|	0	| 0x0325	 |"Invalid key type"	|-2147482843|
+|TSDB_CODE_MND_DNODE_ALREADY_EXIST|	0	| 0x0330	| "DNode already exists"|	-2147482832|
+|TSDB_CODE_MND_DNODE_NOT_EXIST|	0	| 0x0331|	 "DNode does not exist"	|-2147482831|
+|TSDB_CODE_MND_VGROUP_NOT_EXIST|	0	| 0x0332	 |"VGroup does not exist"|	-2147482830|
+|TSDB_CODE_MND_NO_REMOVE_MASTER	|0	| 0x0333	| "Master DNode cannot be removed"|	-2147482829|
+|TSDB_CODE_MND_NO_ENOUGH_DNODES	|0	| 0x0334|	 "Out of DNodes"|	-2147482828|
+|TSDB_CODE_MND_CLUSTER_CFG_INCONSISTENT	|0	| 0x0335	| "Cluster cfg inconsistent"|	-2147482827|
+|TSDB_CODE_MND_INVALID_DNODE_CFG_OPTION|	0	| 0x0336	| "Invalid dnode cfg option"|	-2147482826|
+|TSDB_CODE_MND_BALANCE_ENABLED|	0	| 0x0337	| "Balance already enabled"	|-2147482825|
+|TSDB_CODE_MND_VGROUP_NOT_IN_DNODE|	0	 |0x0338	| "Vgroup not in dnode"|	-2147482824|
+|TSDB_CODE_MND_VGROUP_ALREADY_IN_DNODE|	0	| 0x0339	| "Vgroup already in dnode"|	-2147482823|
+|TSDB_CODE_MND_DNODE_NOT_FREE	|0	| 0x033A	 |"Dnode not avaliable"|	-2147482822|
+|TSDB_CODE_MND_INVALID_CLUSTER_ID	|0	 |0x033B	| "Cluster id not match"|	-2147482821|
+|TSDB_CODE_MND_NOT_READY|	0	| 0x033C	 |"Cluster not ready"|	-2147482820|
+|TSDB_CODE_MND_ACCT_ALREADY_EXIST|	0	| 0x0340	| "Account already exists"	|-2147482816|
+|TSDB_CODE_MND_INVALID_ACCT|	0	| 0x0341|	 "Invalid account"|	-2147482815|
+|TSDB_CODE_MND_INVALID_ACCT_OPTION|	0	| 0x0342	| "Invalid account options"|	-2147482814|
+|TSDB_CODE_MND_USER_ALREADY_EXIST|	0	| 0x0350	| "User already exists"|	-2147482800|
+|TSDB_CODE_MND_INVALID_USER	|0	| 0x0351	| "Invalid user"	|-2147482799|
+|TSDB_CODE_MND_INVALID_USER_FORMAT|	|0	 |0x0352	 |"Invalid user format"	|-2147482798|
+|TSDB_CODE_MND_INVALID_PASS_FORMAT|	0|	 0x0353	| "Invalid password format"|	-2147482797|
+|TSDB_CODE_MND_NO_USER_FROM_CONN|	0	| 0x0354	| "Can not get user from conn"|	-2147482796|
+|TSDB_CODE_MND_TOO_MANY_USERS|	0	| 0x0355|	 "Too many users"|	-2147482795|
+|TSDB_CODE_MND_TABLE_ALREADY_EXIST|	0|	0x0360|	 "Table already exists"|	-2147482784|
+|TSDB_CODE_MND_INVALID_TABLE_ID|	0|	 0x0361|	 "Table name too long"|	-2147482783|
+|TSDB_CODE_MND_INVALID_TABLE_NAME|	0|	 0x0362	| "Table does not exist"|	-2147482782|
+|TSDB_CODE_MND_INVALID_TABLE_TYPE|	0|	 0x0363	| "Invalid table type in tsdb"|	-2147482781|
+|TSDB_CODE_MND_TOO_MANY_TAGS|	0	| 0x0364|	 "Too many tags"|	-2147482780|
+|TSDB_CODE_MND_TOO_MANY_TIMESERIES|	0|	 0x0366|	 "Too many time series"|	-2147482778|
+|TSDB_CODE_MND_NOT_SUPER_TABLE|	0	 |0x0367|	 "Not super table"| 	-2147482777|
+|TSDB_CODE_MND_COL_NAME_TOO_LONG|	0|	 0x0368|	 "Tag name too long"|	-2147482776|
+|TSDB_CODE_MND_TAG_ALREAY_EXIST|	0|	 0x0369|	 "Tag already exists"|	-2147482775|
+|TSDB_CODE_MND_TAG_NOT_EXIST|	0	 |0x036A	| "Tag does not exist"	|-2147482774|
+|TSDB_CODE_MND_FIELD_ALREAY_EXIST|	0	| 0x036B|	 "Field already exists"|	-2147482773|
+|TSDB_CODE_MND_FIELD_NOT_EXIST|	0	| 0x036C	| "Field does not exist"|	-2147482772|
+|TSDB_CODE_MND_INVALID_STABLE_NAME	|0	| 0x036D	 |"Super table does not exist"	|-2147482771|
+|TSDB_CODE_MND_DB_NOT_SELECTED|	0	| 0x0380	| "Database not specified or available"|	-2147482752|
+|TSDB_CODE_MND_DB_ALREADY_EXIST|	0	| 0x0381	| "Database already exists"|	-2147482751|
+|TSDB_CODE_MND_INVALID_DB_OPTION|	0	| 0x0382	| "Invalid database options"|	-2147482750|
+|TSDB_CODE_MND_INVALID_DB|	|0	| 0x0383	| "Invalid database name"|	-2147482749|
+|TSDB_CODE_MND_MONITOR_DB_FORBIDDEN|	0	| 0x0384	| "Cannot delete monitor database"|	-2147482748|
+|TSDB_CODE_MND_TOO_MANY_DATABASES|	0|	 0x0385	| "Too many databases for account"|	-2147482747|
+|TSDB_CODE_MND_DB_IN_DROPPING|	0	| 0x0386|	 "Database not available"	|-2147482746|
+|TSDB_CODE_DND_MSG_NOT_PROCESSED|	0|	 0x0400	| "Message not processed"|	-2147482624|
+|TSDB_CODE_DND_OUT_OF_MEMORY	|0	| 0x0401	| "Dnode out of memory"|	-2147482623|
+|TSDB_CODE_DND_NO_WRITE_ACCESS|	0	| 0x0402	| "No permission for disk files in dnode"|	-2147482622|
+|TSDB_CODE_DND_INVALID_MSG_LEN|	0	| 0x0403	| "Invalid message length"|	-2147482621|
+|TSDB_CODE_VND_ACTION_IN_PROGRESS	|0	 |0x0500|	 "Action in progress"	|-2147482368|
+|TSDB_CODE_VND_MSG_NOT_PROCESSED|	0	 |0x0501	| "Message not processed"	|-2147482367|
+|TSDB_CODE_VND_ACTION_NEED_REPROCESSED	|0	 |0x0502|	 "Action need to be reprocessed"|	-2147482366|
+|TSDB_CODE_VND_INVALID_VGROUP_ID	|0	| 0x0503|	 "Invalid Vgroup ID"|	-2147482365|
+|TSDB_CODE_VND_INIT_FAILED|	0	| 0x0504	| "Vnode initialization failed"|	-2147482364|
+|TSDB_CODE_VND_NO_DISKSPACE|	0	 |0x0505|	 "System out of disk space"	|-2147482363|
+|TSDB_CODE_VND_NO_DISK_PERMISSIONS|	0	| 0x0506|	 "No write permission for disk files"	|-2147482362|
+|TSDB_CODE_VND_NO_SUCH_FILE_OR_DIR|	0	| 0x0507	| "Missing data file"|	-2147482361|
+|TSDB_CODE_VND_OUT_OF_MEMORY	|0|	 0x0508	| "Out of memory"|	-2147482360|
+|TSDB_CODE_VND_APP_ERROR|	0|	 0x0509	| "Unexpected generic error in vnode"|	-2147482359|
+|TSDB_CODE_VND_INVALID_STATUS	|0|	 0x0510	| "Database not ready"|	-2147482352|
+|TSDB_CODE_VND_NOT_SYNCED|	0	| 0x0511	| "Database suspended"|	-2147482351|
+|TSDB_CODE_VND_NO_WRITE_AUTH|	0	| 0x0512|	 "Write operation denied"	|-2147482350|
+|TSDB_CODE_TDB_INVALID_TABLE_ID	|0	| 0x0600	| "Invalid table ID"|	-2147482112|
+|TSDB_CODE_TDB_INVALID_TABLE_TYPE|	0|	 0x0601	 |"Invalid table type"|	-2147482111|
+|TSDB_CODE_TDB_IVD_TB_SCHEMA_VERSION|	0|	 0x0602|	 "Invalid table schema version"|	-2147482110|
+|TSDB_CODE_TDB_TABLE_ALREADY_EXIST|	0	| 0x0603|	 "Table already exists"|	-2147482109|
+|TSDB_CODE_TDB_INVALID_CONFIG|	0	| 0x0604|	 "Invalid configuration"|	-2147482108|
+|TSDB_CODE_TDB_INIT_FAILED|	0	| 0x0605|	 "Tsdb init failed"|	-2147482107|
+|TSDB_CODE_TDB_NO_DISKSPACE|	0	| 0x0606|	 "No diskspace for tsdb"|	-2147482106|
+|TSDB_CODE_TDB_NO_DISK_PERMISSIONS|	0	| 0x0607|	 "No permission for disk files"|	-2147482105|
+|TSDB_CODE_TDB_FILE_CORRUPTED|	0	| 0x0608|	 "Data file(s) corrupted"|	-2147482104|
+|TSDB_CODE_TDB_OUT_OF_MEMORY|	0	| 0x0609|	 "Out of memory"|	-2147482103|
+|TSDB_CODE_TDB_TAG_VER_OUT_OF_DATE|	0	| 0x060A|	 "Tag too old"|	-2147482102|
+|TSDB_CODE_TDB_TIMESTAMP_OUT_OF_RANGE	|0|	 0x060B	| "Timestamp data out of range"|	-2147482101|
+|TSDB_CODE_TDB_SUBMIT_MSG_MSSED_UP|	0|	 0x060C|	 "Submit message is messed up"|	-2147482100|
+|TSDB_CODE_TDB_INVALID_ACTION|	0	| 0x060D	| "Invalid operation"|	-2147482099|
+|TSDB_CODE_TDB_INVALID_CREATE_TB_MSG|	0	| 0x060E|	 "Invalid creation of table"|	-2147482098|
+|TSDB_CODE_TDB_NO_TABLE_DATA_IN_MEM|	0	| 0x060F|	 "No table data in memory skiplist"	|-2147482097|
+|TSDB_CODE_TDB_FILE_ALREADY_EXISTS|	0	| 0x0610|	 "File already exists"|	-2147482096|
+|TSDB_CODE_TDB_TABLE_RECONFIGURE|	0	| 0x0611|	 "Need to reconfigure table"|	-2147482095|
+|TSDB_CODE_TDB_IVD_CREATE_TABLE_INFO|	0	| 0x0612|	 "Invalid information to create table"|	-2147482094|
+|TSDB_CODE_QRY_INVALID_QHANDLE|	0	| 0x0700|	 "Invalid handle"|	-2147481856|
+|TSDB_CODE_QRY_INVALID_MSG|	0	| 0x0701|	 "Invalid message"|  	-2147481855|
+|TSDB_CODE_QRY_NO_DISKSPACE|	0	| 0x0702	| "No diskspace for query"|	-2147481854|
+|TSDB_CODE_QRY_OUT_OF_MEMORY|	0	| 0x0703	| "System out of memory"|	-2147481853|
+|TSDB_CODE_QRY_APP_ERROR|	0	| 0x0704	| "Unexpected generic error in query"|	-2147481852|
+|TSDB_CODE_QRY_DUP_JOIN_KEY|	0	| 0x0705|	 "Duplicated join key"|	-2147481851|
+|TSDB_CODE_QRY_EXCEED_TAGS_LIMIT|	0	| 0x0706	| "Tag conditon too many"|	-2147481850|
+|TSDB_CODE_QRY_NOT_READY	|0|	 0x0707	| "Query not ready"	|-2147481849|
+|TSDB_CODE_QRY_HAS_RSP|	0	| 0x0708|	 "Query should response"|	-2147481848|
+|TSDB_CODE_GRANT_EXPIRED|	0	| 0x0800|	 "License expired"|	-2147481600|
+|TSDB_CODE_GRANT_DNODE_LIMITED|	0	| 0x0801	| "DNode creation limited by licence"|	-2147481599|
+|TSDB_CODE_GRANT_ACCT_LIMITED	|0|	 0x0802	 |"Account creation limited by license"|	-2147481598|
+|TSDB_CODE_GRANT_TIMESERIES_LIMITED|	0	| 0x0803	| "Table creation limited by license"|	-2147481597|
+|TSDB_CODE_GRANT_DB_LIMITED|	0	| 0x0804	| "DB creation limited by license"|	-2147481596|
+|TSDB_CODE_GRANT_USER_LIMITED|	0	| 0x0805	| "User creation limited by license"|	-2147481595|
+|TSDB_CODE_GRANT_CONN_LIMITED|	0|	 0x0806	| "Conn creation limited by license"	|-2147481594|
+|TSDB_CODE_GRANT_STREAM_LIMITED|	0	| 0x0807	| "Stream creation limited by license"|	-2147481593|
+|TSDB_CODE_GRANT_SPEED_LIMITED|	0	| 0x0808	| "Write speed limited by license"	|-2147481592|
+|TSDB_CODE_GRANT_STORAGE_LIMITED|	0	 |0x0809	| "Storage capacity limited by license"|	-2147481591|
+|TSDB_CODE_GRANT_QUERYTIME_LIMITED|	0	| 0x080A	| "Query time limited by license"	|-2147481590|
+|TSDB_CODE_GRANT_CPU_LIMITED|	0	 |0x080B	 |"CPU cores limited by license"|	-2147481589|
+|TSDB_CODE_SYN_INVALID_CONFIG|	0	| 0x0900|	 "Invalid Sync Configuration"|	-2147481344|
+|TSDB_CODE_SYN_NOT_ENABLED|	0	| 0x0901	| "Sync module not enabled"	|-2147481343|
+|TSDB_CODE_WAL_APP_ERROR|	0|	 0x1000	| "Unexpected generic error in wal"	|-2147479552|
--- a/documentation20/webdocs/markdowndocs/administrator-ch.md
+++ b/documentation20/webdocs/markdowndocs/administrator-ch.md
@ -93,6 +93,7 @@ TDengine系统后台服务由taosd提供，可以在配置文件taos.cfg里修
 - role：dnode的可选角色。0-any; 既可作为mnode，也可分配vnode；1-mgmt;只能作为mnode，不能分配vnode；2-dnode;不能作为mnode，只能分配vnode
 - debugFlag：运行日志开关。131（输出错误和警告日志），135（ 输出错误、警告和调试日志），143（ 输出错误、警告、调试和跟踪日志）。默认值：131或135（不同模块有不同的默认值）。
 - numOfLogLines：单个日志文件允许的最大行数。默认值：10,000,000行。
+- logKeepDays：日志文件的最长保存时间。大于0时，日志文件会被重命名为taosdlog.xxx，其中xxx为日志文件最后修改的时间戳，单位为秒。默认值：0天。
 - maxSQLLength：单条SQL语句允许最长限制。默认值：65380字节。
 - telemetryReporting: 是否允许 TDengine 采集和上报基本使用信息，0表示不允许，1表示允许。 默认值：1。

--- a/documentation20/webdocs/markdowndocs/connector-java-ch.md
+++ b/documentation20/webdocs/markdowndocs/connector-java-ch.md
@ -229,6 +229,7 @@ stmt.close();
 conn.close();
 ```
 > `注意务必要将 connection 进行关闭`，否则会出现连接泄露。  
+
 ## 与连接池使用

 **HikariCP**
--- a/documentation20/webdocs/markdowndocs/faq-ch.md
+++ b/documentation20/webdocs/markdowndocs/faq-ch.md
@ -47,66 +47,11 @@
   检查服务器侧TCP端口连接是否工作：`nc -l {port}`
   检查客户端侧TCP端口链接是否工作：`nc {hostIP} {port}`
   
-10. 可以使用taos程序内嵌的网络连通检测功能：验证服务器和客户端之间指定的端口连接是否通畅（包括TCP和UDP）。
-
-    taos通过参数 -n 来确定运行服务端功能，还是客户端功能。-n server：表示运行检测服务端功能；-n client：表示运行检测客户端功能。
-
-    1）首先在服务器上停止taosd服务；
-
-    2）在服务器上运行taos内嵌的网络连通检测的服务端功能：taos -n server -P 6030 -e 6042 -l 1000；
-
-    3）在客户端运行taos内嵌的网络连通检测的客户端功能：taos -n client -h host -P 6030 -e 6042 -l 1000；
-
-    -n ：指示运行网络连通检测的服务端功能，或客户端功能，缺省值为空，表示不启动网络连通检测；
-
-    -h：指示服务端名称，可以是ip地址或fqdn格式。如：192.168.1.160，或 192.168.1.160:6030，或 hostname1，或hostname1:6030。缺省值是127.0.0.1。
-
-    -P ：检测的起始端口号，缺省值是6030；
-
-    -e：检测的结束端口号，必须大于等于起始端口号，缺省值是6042；
-
-    -l：指定检测端口连通的报文长度，最大64000字节，缺省值是1000字节，测试时服务端和客户端必须指定相同；
-
-    服务端设置的起始端口和结束端口号，必须包含客户端设置的起始端口和结束端口号；
-
-    对于起始端口号有三种设置方式：缺省值、-h指定、-P指定，优先级是：-P指定 > -h指定 > 缺省值。
-
-    客户端运行的输出样例：
-
-    `sum@sum-virtualBox /home/sum $ taos -n client -h ubuntu-vbox6`
-
-    `host: ubuntu-vbox6	start port: 6030	end port: 6042	packet len: 1000`
-
-    `tcp port:6030 test ok.		udp port:6030 test ok.`
-    
-    `tcp port:6031 test ok.		udp port:6031 test ok.`
-    
-    `tcp port:6032 test ok.		udp port:6032 test ok.`
-    
-    `tcp port:6033 test ok.		udp port:6033 test ok.`
-    
-    `tcp port:6034 test ok.		udp port:6034 test ok.`
-    
-    `tcp port:6035 test ok.		udp port:6035 test ok.`
-    
-    `tcp port:6036 test ok.		udp port:6036 test ok.`
-
-    `tcp port:6037 test ok.		udp port:6037 test ok.`
-    
-    `tcp port:6038 test ok.		udp port:6038 test ok.`
-    
-    `tcp port:6039 test ok.		udp port:6039 test ok.`
-    
-    `tcp port:6040 test ok.		udp port:6040 test ok.`
-    
-    `tcp port:6041 test ok.		udp port:6041 test ok.`
-    
-    `tcp port:6042 test ok.		udp port:6042 test ok.`
-    
-    如果某个端口不通，会输出 `port：xxxx test fail`的信息。
+10. 也可以使用taos程序内嵌的网络连通检测功能，来验证服务器和客户端之间指定的端口连接是否通畅（包括TCP和UDP）：[TDengine 内嵌网络检测工具使用指南](https://www.taosdata.com/blog/2020/09/08/1816.html)。


-## 6. 遇到错误“Unexpected generic error in RPC”， 我怎么办？
+
+## 6. 遇到错误“Unexpected generic error in RPC”或者"TDengine Error: Unable to resolve FQDN"， 我怎么办？
 产生这个错误，是由于客户端或数据节点无法解析FQDN(Fully Qualified Domain Name)导致。对于TAOS Shell或客户端应用，请做如下检查：

 1. 请检查连接的服务器的FQDN是否正确
--- a/packaging/cfg/taos.cfg
+++ b/packaging/cfg/taos.cfg
@ -122,11 +122,14 @@
 # number of replications, for cluster only 
 # replica               1

-# mqtt uri  
-# mqttBrokerAddress     mqtt://username:password@hostname:1883/taos/
+# mqtt hostname  
+# mqttHostName          test.mosquitto.org

-# mqtt client name 
-# mqttBrokerClientId    taos_mqtt
+# mqtt port  
+# mqttPort              1883
+
+# mqtt topic
+# mqttTopic             /test

 # the compressed rpc message, option:
 #  -1 (no compression)
@ -186,6 +189,9 @@
 # max number of rows per log filters
 # numOfLogLines         10000000

+# time of keeping log files, days
+# logKeepDays           0
+
 # enable/disable async log
 # asyncLog              1

--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@ -1,6 +1,6 @@
 name: tdengine
-base: core18 # the base snap is the execution environment for this snap
-version: '2.0.2.0' # just for humans, typically '1.2+git' or '1.3.2'
+base: core18
+version: 'RELEASE_VERSION'
 icon: snap/gui/t-dengine.svg
 summary: an open-source big data platform designed and optimized for IoT. 
 description: |
@ -72,7 +72,7 @@ parts:
      - usr/bin/taosd
      - usr/bin/taos
      - usr/bin/taosdemo
-      - usr/lib/libtaos.so.2.0.2.0
+      - usr/lib/libtaos.so.RELEASE_VERSION
      - usr/lib/libtaos.so.1
      - usr/lib/libtaos.so

--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@ -10,7 +10,9 @@ ADD_SUBDIRECTORY(client)
 ADD_SUBDIRECTORY(query)
 ADD_SUBDIRECTORY(kit)
 ADD_SUBDIRECTORY(plugins)
-ADD_SUBDIRECTORY(sync)
+IF (TD_SYNC)
+  ADD_SUBDIRECTORY(sync)
+ENDIF ()
 ADD_SUBDIRECTORY(balance)
 ADD_SUBDIRECTORY(mnode)
 ADD_SUBDIRECTORY(vnode)
--- a/src/client/src/TSDBJNIConnector.c
+++ b/src/client/src/TSDBJNIConnector.c
@ -437,13 +437,8 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getSchemaMetaData
 * @return
 */
 jstring jniFromNCharToByteArray(JNIEnv *env, char *nchar, int32_t maxBytes) {
-  int len = (int)strlen(nchar);
-  if (len > maxBytes) {  // no terminated symbol exists '\0'
-    len = maxBytes;
-  }
-
-  jbyteArray bytes = (*env)->NewByteArray(env, len);
-  (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte *)nchar);
+  jbyteArray bytes = (*env)->NewByteArray(env, maxBytes);
+  (*env)->SetByteArrayRegion(env, bytes, 0, maxBytes, (jbyte *)nchar);
  return bytes;
 }

@ -481,6 +476,8 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchRowImp(JNIEn
    }
  }

+  int32_t* length = taos_fetch_lengths(result);
+
  char tmp[TSDB_MAX_BYTES_PER_ROW] = {0};

  for (int i = 0; i < num_fields; i++) {
@ -515,15 +512,15 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchRowImp(JNIEn
        (*env)->CallVoidMethod(env, rowobj, g_rowdataSetDoubleFp, i, (jdouble)dv);
      } break;
      case TSDB_DATA_TYPE_BINARY: {
-        strncpy(tmp, row[i], (size_t)fields[i].bytes);  // handle the case that terminated does not exist
+        memcpy(tmp, row[i], length[i]);  // handle the case that terminated does not exist
        (*env)->CallVoidMethod(env, rowobj, g_rowdataSetStringFp, i, (*env)->NewStringUTF(env, tmp));

-        memset(tmp, 0, (size_t)fields[i].bytes);
+        memset(tmp, 0, length[i]);
        break;
      }
      case TSDB_DATA_TYPE_NCHAR: {
        (*env)->CallVoidMethod(env, rowobj, g_rowdataSetByteArrayFp, i,
-                               jniFromNCharToByteArray(env, (char *)row[i], fields[i].bytes));
+                               jniFromNCharToByteArray(env, (char *)row[i], length[i]));
        break;
      }
      case TSDB_DATA_TYPE_TIMESTAMP:
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@ -232,8 +232,9 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
      } else if (pInfo->type == TSDB_SQL_DROP_TABLE) {
        assert(pInfo->pDCLInfo->nTokens == 1);

-        if (tscSetTableFullName(pTableMetaInfo, pzName, pSql) != TSDB_CODE_SUCCESS) {
-          return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
+        code = tscSetTableFullName(pTableMetaInfo, pzName, pSql);
+        if(code != TSDB_CODE_SUCCESS) {
+          return code; 
        }
      } else if (pInfo->type == TSDB_SQL_DROP_DNODE) {
        pzName->n = strdequote(pzName->z);
@ -348,8 +349,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {

    case TSDB_SQL_DESCRIBE_TABLE: {
      SStrToken*  pToken = &pInfo->pDCLInfo->a[0];
-      const char* msg2 = "table name is too long";
      const char* msg1 = "invalid table name";
+      const char* msg2 = "table name is too long";

      if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
@ -710,7 +711,9 @@ int32_t parseSlidingClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQu
 }

 int32_t tscSetTableFullName(STableMetaInfo* pTableMetaInfo, SStrToken* pzTableName, SSqlObj* pSql) {
-  const char* msg = "name too long";
+  const char* msg1 = "name too long";
+  const char* msg2 = "invalid db name";
+  const char *msg = msg1;

  SSqlCmd* pCmd = &pSql->cmd;
  int32_t  code = TSDB_CODE_SUCCESS;
@ -728,15 +731,13 @@ int32_t tscSetTableFullName(STableMetaInfo* pTableMetaInfo, SStrToken* pzTableNa
  } else {  // get current DB name first, then set it into path
    SStrToken t = {0};
    getCurrentDBName(pSql, &t);
-
+    if (t.n == 0) {
+      msg = msg2;
+    }
    code = setObjFullName(pTableMetaInfo->name, NULL, &t, pzTableName, NULL);
  }
-
  if (code != TSDB_CODE_SUCCESS) {
    invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg);
-  }
-
-  if (code != TSDB_CODE_SUCCESS) {
    free(oldName);  
    return code;
  }
@ -1072,7 +1073,7 @@ int32_t setObjFullName(char* fullName, const char* account, SStrToken* pDB, SStr

  /* db name is not specified, the tableName dose not include db name */
  if (pDB != NULL) {
-    if (pDB->n >= TSDB_ACCT_LEN + TSDB_DB_NAME_LEN) {
+    if (pDB->n >= TSDB_ACCT_LEN + TSDB_DB_NAME_LEN || pDB->n == 0) {
      return TSDB_CODE_TSC_INVALID_SQL;
    }

@ -1597,13 +1598,14 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
      SColumnIndex index = COLUMN_INDEX_INITIALIZER;

      if (pItem->pNode->pParam != NULL) {
-        SStrToken* pToken = &pItem->pNode->pParam->a[0].pNode->colInfo;
-        if (pToken->z == NULL || pToken->n == 0) {
+        tSQLExprItem* pParamElem = &pItem->pNode->pParam->a[0];
+        SStrToken* pToken = &pParamElem->pNode->colInfo;
+        short sqlOptr = pParamElem->pNode->nSQLOptr;
+        if ((pToken->z == NULL || pToken->n == 0) 
+            && (TK_INTEGER != sqlOptr)) /*select count(1) from table*/ {
          return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
        } 
-
-        tSQLExprItem* pParamElem = &pItem->pNode->pParam->a[0];
-        if (pParamElem->pNode->nSQLOptr == TK_ALL) {
+        if (sqlOptr == TK_ALL) {
          // select table.*
          // check if the table name is valid or not
          SStrToken tmpToken = pParamElem->pNode->colInfo;
@ -1615,6 +1617,21 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
          index = (SColumnIndex){0, PRIMARYKEY_TIMESTAMP_COL_INDEX};
          int32_t size = tDataTypeDesc[TSDB_DATA_TYPE_BIGINT].nSize;
          pExpr = tscSqlExprAppend(pQueryInfo, functionID, &index, TSDB_DATA_TYPE_BIGINT, size, size, false);
+        } else if (sqlOptr == TK_INTEGER) { // select count(1) from table1
+          char buf[8] = {0};  
+          int64_t val = -1;
+          tVariant* pVariant = &pParamElem->pNode->val;
+          if (pVariant->nType == TSDB_DATA_TYPE_BIGINT) {
+            tVariantDump(pVariant, buf, TSDB_DATA_TYPE_BIGINT, true);
+            val = GET_INT64_VAL(buf); 
+          }
+          if (val == 1) {
+            index = (SColumnIndex){0, PRIMARYKEY_TIMESTAMP_COL_INDEX};
+            int32_t size = tDataTypeDesc[TSDB_DATA_TYPE_BIGINT].nSize;
+            pExpr = tscSqlExprAppend(pQueryInfo, functionID, &index, TSDB_DATA_TYPE_BIGINT, size, size, false);
+          } else {
+            return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
+          }
        } else {
          // count the number of meters created according to the super table
          if (getColumnIndexByName(pCmd, pToken, pQueryInfo, &index) != TSDB_CODE_SUCCESS) {
@ -2739,25 +2756,29 @@ static int32_t doExtractColumnFilterInfo(SSqlCmd* pCmd, SQueryInfo* pQueryInfo,
    }
  }

+  int32_t retVal = TSDB_CODE_SUCCESS;
  if (pExpr->nSQLOptr == TK_LE || pExpr->nSQLOptr == TK_LT) {
-    tVariantDump(&pRight->val, (char*)&pColumnFilter->upperBndd, colType, false);
-  } else {  // TK_GT,TK_GE,TK_EQ,TK_NE are based on the pColumn->lowerBndd
-    if (colType == TSDB_DATA_TYPE_BINARY) {
+    retVal = tVariantDump(&pRight->val, (char*)&pColumnFilter->upperBndd, colType, false);
+
+  // TK_GT,TK_GE,TK_EQ,TK_NE are based on the pColumn->lowerBndd
+  } else if (colType == TSDB_DATA_TYPE_BINARY) {
    pColumnFilter->pz = (int64_t)calloc(1, pRight->val.nLen + TSDB_NCHAR_SIZE);
    pColumnFilter->len = pRight->val.nLen;
+    retVal = tVariantDump(&pRight->val, (char*)pColumnFilter->pz, colType, false);

-      tVariantDump(&pRight->val, (char*)pColumnFilter->pz, colType, false);
  } else if (colType == TSDB_DATA_TYPE_NCHAR) {
    // pRight->val.nLen + 1 is larger than the actual nchar string length
    pColumnFilter->pz = (int64_t)calloc(1, (pRight->val.nLen + 1) * TSDB_NCHAR_SIZE);
-
-      tVariantDump(&pRight->val, (char*)pColumnFilter->pz, colType, false);
-
+    retVal = tVariantDump(&pRight->val, (char*)pColumnFilter->pz, colType, false);
    size_t len = twcslen((wchar_t*)pColumnFilter->pz);
    pColumnFilter->len = len * TSDB_NCHAR_SIZE;
+
  } else {
-      tVariantDump(&pRight->val, (char*)&pColumnFilter->lowerBndd, colType, false);
+    retVal = tVariantDump(&pRight->val, (char*)&pColumnFilter->lowerBndd, colType, false);
  }
+
+  if (retVal != TSDB_CODE_SUCCESS) {
+    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg);
  } 

  switch (pExpr->nSQLOptr) {
@ -4430,7 +4451,6 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
  const int32_t DEFAULT_TABLE_INDEX = 0;

  const char* msg1 = "invalid table name";
-  const char* msg2 = "table name too long";
  const char* msg3 = "manipulation of tag available for super table";
  const char* msg4 = "set tag value only available for table";
  const char* msg5 = "only support add one tag";
@ -4463,7 +4483,7 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
  }

  if (tscSetTableFullName(pTableMetaInfo, &(pAlterSQL->name), pSql) != TSDB_CODE_SUCCESS) {
-    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+    return TSDB_CODE_TSC_INVALID_SQL;
  }

  int32_t ret = tscGetTableMeta(pSql, pTableMetaInfo);
@ -5724,7 +5744,6 @@ void tscPrintSelectClause(SSqlObj* pSql, int32_t subClauseIndex) {

 int32_t doCheckForCreateTable(SSqlObj* pSql, int32_t subClauseIndex, SSqlInfo* pInfo) {
  const char* msg1 = "invalid table name";
-  const char* msg2 = "table name too long";

  SSqlCmd*        pCmd = &pSql->cmd;
  SQueryInfo*     pQueryInfo = tscGetQueryInfoDetail(pCmd, subClauseIndex);
@ -5745,7 +5764,7 @@ int32_t doCheckForCreateTable(SSqlObj* pSql, int32_t subClauseIndex, SSqlInfo* p
  }

  if (tscSetTableFullName(pTableMetaInfo, pzTableName, pSql) != TSDB_CODE_SUCCESS) {
-    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+    return TSDB_CODE_TSC_INVALID_SQL;
  }

  if (!validateTableColumnInfo(pFieldList, pCmd) ||
@ -5800,7 +5819,7 @@ int32_t doCheckForCreateFromStable(SSqlObj* pSql, SSqlInfo* pInfo) {
  }

  if (tscSetTableFullName(pStableMeterMetaInfo, pToken, pSql) != TSDB_CODE_SUCCESS) {
-    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
+    return TSDB_CODE_TSC_INVALID_SQL;
  }

  // get meter meta from mnode
@ -5992,7 +6011,7 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
  assert(pQuerySql != NULL && (pQuerySql->from == NULL || pQuerySql->from->nExpr > 0));

  const char* msg0  = "invalid table name";
-  const char* msg1  = "table name too long";
+  //const char* msg1  = "table name too long";
  const char* msg2  = "point interpolation query needs timestamp";
  const char* msg5  = "fill only available for interval query";
  const char* msg6  = "start(end) time of query range required or time range too large";
@ -6065,7 +6084,7 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {

    SStrToken t = {.type = TSDB_DATA_TYPE_BINARY, .n = pTableItem->nLen, .z = pTableItem->pz};
    if (tscSetTableFullName(pTableMetaInfo1, &t, pSql) != TSDB_CODE_SUCCESS) {
-      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
+      return TSDB_CODE_TSC_INVALID_SQL;
    }

    tVariant* pTableItem1 = &pQuerySql->from->a[i + 1].pVar;
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@ -2013,7 +2013,8 @@ int tscProcessUseDbRsp(SSqlObj *pSql) {
  return 0;
 }

-int tscProcessDropDbRsp(SSqlObj *UNUSED_PARAM(pSql)) {
+int tscProcessDropDbRsp(SSqlObj *pSql) {
+  pSql->pTscObj->db[0] = 0;
  taosCacheEmpty(tscCacheHandle);
  return 0;
 }
--- a/src/common/inc/tdataformat.h
+++ b/src/common/inc/tdataformat.h
@ -325,8 +325,6 @@ void   tdResetKVRowBuilder(SKVRowBuilder *pBuilder);
 SKVRow tdGetKVRowFromBuilder(SKVRowBuilder *pBuilder);

 static FORCE_INLINE int tdAddColToKVRow(SKVRowBuilder *pBuilder, int16_t colId, int8_t type, void *value) {
-  ASSERT(pBuilder->nCols == 0 || colId > pBuilder->pColIdx[pBuilder->nCols - 1].colId);
-
  if (pBuilder->nCols >= pBuilder->tCols) {
    pBuilder->tCols *= 2;
    pBuilder->pColIdx = (SColIdx *)realloc((void *)(pBuilder->pColIdx), sizeof(SColIdx) * pBuilder->tCols);
--- a/src/common/inc/tglobal.h
+++ b/src/common/inc/tglobal.h
@ -104,8 +104,12 @@ extern int32_t  tsTelegrafUseFieldNum;

 // mqtt
 extern int32_t tsEnableMqttModule;
-extern char    tsMqttBrokerAddress[];
-extern char    tsMqttBrokerClientId[];
+extern char tsMqttHostName[];
+extern char tsMqttPort[];
+extern char tsMqttUser[];
+extern char tsMqttPass[];
+extern char tsMqttClientId[];
+extern char tsMqttTopic[];

 // monitor
 extern int32_t tsEnableMonitorModule;
@ -154,6 +158,7 @@ extern char buildinfo[];
 // log
 extern int32_t tsAsyncLog;
 extern int32_t tsNumOfLogLines;
+extern int32_t tsLogKeepDays;
 extern int32_t dDebugFlag;
 extern int32_t vDebugFlag;
 extern int32_t mDebugFlag;
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@ -137,8 +137,12 @@ int32_t  tsTelegrafUseFieldNum = 0;

 // mqtt
 int32_t tsEnableMqttModule = 0;  // not finished yet, not started it by default
-char    tsMqttBrokerAddress[128] = {0};
-char    tsMqttBrokerClientId[128] = {0};
+char    tsMqttHostName[TSDB_MQTT_HOSTNAME_LEN] = "test.mosquitto.org";
+char    tsMqttPort[TSDB_MQTT_PORT_LEN] = "1883";
+char    tsMqttUser[TSDB_MQTT_USER_LEN] = {0};
+char    tsMqttPass[TSDB_MQTT_PASS_LEN] = {0};
+char    tsMqttClientId[TSDB_MQTT_CLIENT_ID_LEN] = "TDengineMqttSubscriber";
+char    tsMqttTopic[TSDB_MQTT_TOPIC_LEN] = "/test"; // #

 // monitor
 int32_t tsEnableMonitorModule = 1;
@ -247,8 +251,11 @@ bool taosCfgDynamicOptions(char *msg) {

  for (int32_t i = 0; i < tsGlobalConfigNum; ++i) {
    SGlobalCfg *cfg = tsGlobalConfig + i;
-    if (!(cfg->cfgType & TSDB_CFG_CTYPE_B_LOG)) continue;
+    //if (!(cfg->cfgType & TSDB_CFG_CTYPE_B_LOG)) continue;
    if (cfg->valType != TAOS_CFG_VTYPE_INT32) continue;
+    
+    int32_t cfgLen = (int32_t)strlen(cfg->option);
+    if (cfgLen != olen) continue;
    if (strncasecmp(option, cfg->option, olen) != 0) continue;
    *((int32_t *)cfg->ptr) = vint;

@ -767,23 +774,33 @@ static void doInitGlobalConfig(void) {
  cfg.unitType = TAOS_CFG_UTYPE_NONE;
  taosInitConfigOption(cfg);

-  cfg.option = "mqttBrokerAddress";
-  cfg.ptr = tsMqttBrokerAddress;
+  cfg.option = "mqttHostName";
+  cfg.ptr = tsMqttHostName;
  cfg.valType = TAOS_CFG_VTYPE_STRING;
-  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_CLIENT | TSDB_CFG_CTYPE_B_NOT_PRINT;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_NOT_PRINT;
  cfg.minValue = 0;
  cfg.maxValue = 0;
-  cfg.ptrLength = 126;
+  cfg.ptrLength = TSDB_MQTT_HOSTNAME_LEN;
  cfg.unitType = TAOS_CFG_UTYPE_NONE;
  taosInitConfigOption(cfg);

-  cfg.option = "mqttBrokerClientId";
-  cfg.ptr = tsMqttBrokerClientId;
+  cfg.option = "mqttPort";
+  cfg.ptr = tsMqttPort;
  cfg.valType = TAOS_CFG_VTYPE_STRING;
-  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_CLIENT | TSDB_CFG_CTYPE_B_NOT_PRINT;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_NOT_PRINT;
  cfg.minValue = 0;
  cfg.maxValue = 0;
-  cfg.ptrLength = 126;
+  cfg.ptrLength = TSDB_MQTT_PORT_LEN;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
+  cfg.option = "mqttTopic";
+  cfg.ptr = tsMqttTopic;
+  cfg.valType = TAOS_CFG_VTYPE_STRING;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_NOT_PRINT;
+  cfg.minValue = 0;
+  cfg.maxValue = 0;
+  cfg.ptrLength = TSDB_MQTT_TOPIC_LEN;
  cfg.unitType = TAOS_CFG_UTYPE_NONE;
  taosInitConfigOption(cfg);

@ -996,12 +1013,22 @@ static void doInitGlobalConfig(void) {
  cfg.ptr = &tsNumOfLogLines;
  cfg.valType = TAOS_CFG_VTYPE_INT32;
  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_LOG | TSDB_CFG_CTYPE_B_CLIENT;
-  cfg.minValue = 10000;
+  cfg.minValue = 1000;
  cfg.maxValue = 2000000000;
  cfg.ptrLength = 0;
  cfg.unitType = TAOS_CFG_UTYPE_NONE;
  taosInitConfigOption(cfg);

+  cfg.option = "logKeepDays";
+  cfg.ptr = &tsLogKeepDays;
+  cfg.valType = TAOS_CFG_VTYPE_INT32;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_LOG | TSDB_CFG_CTYPE_B_CLIENT;
+  cfg.minValue = 0;
+  cfg.maxValue = 365000;
+  cfg.ptrLength = 0;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
  cfg.option = "asyncLog";
  cfg.ptr = &tsAsyncLog;
  cfg.valType = TAOS_CFG_VTYPE_INT16;
@ -1270,6 +1297,9 @@ void taosInitGlobalCfg() {
 }

 bool taosCheckGlobalCfg() {
+  char fqdn[TSDB_FQDN_LEN];
+  uint16_t port;
+
  if (debugFlag & DEBUG_TRACE || debugFlag & DEBUG_DEBUG || debugFlag & DEBUG_DUMP) {
    taosSetAllDebugFlag();
  }
@ -1278,15 +1308,21 @@ bool taosCheckGlobalCfg() {
    taosGetFqdn(tsLocalFqdn);
  }

-  snprintf(tsLocalEp, sizeof(tsLocalEp), "%s:%d", tsLocalFqdn, tsServerPort);
+  snprintf(tsLocalEp, sizeof(tsLocalEp), "%s:%u", tsLocalFqdn, tsServerPort);
  uInfo("localEp is: %s", tsLocalEp);

  if (tsFirst[0] == 0) {
    strcpy(tsFirst, tsLocalEp);
+  } else {
+    taosGetFqdnPortFromEp(tsFirst, fqdn, &port);
+    snprintf(tsFirst, sizeof(tsFirst), "%s:%u", fqdn, port);
  }

  if (tsSecond[0] == 0) {
    strcpy(tsSecond, tsLocalEp);
+  } else {
+    taosGetFqdnPortFromEp(tsSecond, fqdn, &port);
+    snprintf(tsSecond, sizeof(tsSecond), "%s:%u", fqdn, port);
  }

  taosGetSystemInfo();
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/QueryDataTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/QueryDataTest.java
@ -0,0 +1,81 @@
+package com.taosdata.jdbc;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.sql.*;
+import java.util.Properties;
+import java.util.Random;
+
+import static org.junit.Assert.assertEquals;
+import java.util.Properties;
+import java.util.concurrent.Executors;
+import java.util.concurrent.*;
+
+import static org.junit.Assert.assertTrue;
+
+public class QueryDataTest extends BaseTest {
+
+    static Connection connection = null;
+    static Statement statement = null;
+    static String dbName = "test";
+    static String stbName = "meters";
+    static String host = "localhost";
+    static int numOfTables = 30;
+    final static int numOfRecordsPerTable = 1000;
+    static long ts = 1496732686000l;
+    final static String tablePrefix = "t";
+
+    @Before
+    public void createDatabase() throws SQLException {
+        try {
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+        } catch (ClassNotFoundException e) {
+            return;
+        }
+        
+        Properties properties = new Properties();
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+        connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/", properties);
+                
+        statement = connection.createStatement();
+        statement.executeUpdate("drop database if exists " + dbName);
+        statement.executeUpdate("create database if not exists " + dbName);
+        statement.executeUpdate("use " + dbName);
+
+        String createTableSql = "create table " + stbName + "(ts timestamp, name binary(6))";  
+        statement.executeUpdate(createTableSql); 
+    }
+    
+    @Test
+    public void testQueryBinaryData() throws SQLException{                
+                
+        String insertSql = "insert into "  + stbName + " values(now, 'taosda')";
+        System.out.println(insertSql);        
+
+        statement.executeUpdate(insertSql);
+
+        String querySql = "select * from " + stbName;
+        ResultSet rs = statement.executeQuery(querySql); 
+
+        while(rs.next()) {
+            String name = rs.getString(2) + "001";
+            System.out.println("name = " + name);
+            assertEquals(name, "taosda001");
+        }
+        rs.close();        
+    }
+
+
+    @After
+    public void close() throws Exception {        
+        statement.close();
+        connection.close();
+        Thread.sleep(10);
+    }
+    
+}
--- a/src/dnode/CMakeLists.txt
+++ b/src/dnode/CMakeLists.txt
@ -11,10 +11,12 @@ AUX_SOURCE_DIRECTORY(src SRC)

 IF (TD_LINUX)
  ADD_EXECUTABLE(taosd ${SRC})
+  TARGET_LINK_LIBRARIES(taosd mnode monitor http tsdb twal vnode cJson lz4)
+
  IF (TD_SOMODE_STATIC)
-    TARGET_LINK_LIBRARIES(taosd mnode taos_static monitor http mqtt tsdb twal vnode cJson lz4 balance sync)
+    TARGET_LINK_LIBRARIES(taosd taos_static)
  ELSE ()
-    TARGET_LINK_LIBRARIES(taosd mnode taos monitor http mqtt tsdb twal vnode cJson lz4 balance sync)
+    TARGET_LINK_LIBRARIES(taosd taos)
  ENDIF ()

  IF (TD_ACCOUNT)
@ -25,6 +27,14 @@ IF (TD_LINUX)
    TARGET_LINK_LIBRARIES(taosd grant)
  ENDIF ()

+  IF (TD_MQTT)
+    TARGET_LINK_LIBRARIES(taosd mqtt)
+  ENDIF ()
+
+  IF (TD_SYNC)
+    TARGET_LINK_LIBRARIES(taosd balance sync)
+  ENDIF ()
+
  SET(PREPARE_ENV_CMD "prepare_env_cmd")
  SET(PREPARE_ENV_TARGET "prepare_env_target")
  ADD_CUSTOM_COMMAND(OUTPUT ${PREPARE_ENV_CMD}
--- a/src/dnode/src/dnodeMgmt.c
+++ b/src/dnode/src/dnodeMgmt.c
@ -611,7 +611,7 @@ static bool dnodeReadMnodeInfos() {
  }

  for (int i = 0; i < size; ++i) {
-    cJSON* nodeInfo = cJSON_GetArrayItem(nodeInfos, i);
+    cJSON *nodeInfo = cJSON_GetArrayItem(nodeInfos, i);
    if (nodeInfo == NULL) continue;

    cJSON *nodeId = cJSON_GetObjectItem(nodeInfo, "nodeId");
--- a/src/dnode/src/dnodeModule.c
+++ b/src/dnode/src/dnodeModule.c
@ -62,6 +62,7 @@ static void dnodeAllocModules() {
    dnodeSetModuleStatus(TSDB_MOD_HTTP);
  }

+#ifdef _MQTT
  tsModule[TSDB_MOD_MQTT].enable = (tsEnableMqttModule == 1);
  tsModule[TSDB_MOD_MQTT].name = "mqtt";
  tsModule[TSDB_MOD_MQTT].initFp = mqttInitSystem;
@ -71,6 +72,7 @@ static void dnodeAllocModules() {
  if (tsEnableMqttModule) {
    dnodeSetModuleStatus(TSDB_MOD_MQTT);
  }
+#endif  

  tsModule[TSDB_MOD_MONITOR].enable    = (tsEnableMonitorModule == 1);
  tsModule[TSDB_MOD_MONITOR].name      = "monitor";
--- a/src/dnode/src/dnodeShell.c
+++ b/src/dnode/src/dnodeShell.c
@ -154,15 +154,15 @@ static int dnodeRetrieveUserAuthInfo(char *user, char *spi, char *encrypt, char
  rpcMsg.contLen = sizeof(SDMAuthMsg);
  rpcMsg.msgType = TSDB_MSG_TYPE_DM_AUTH;
  
-  dDebug("user:%s, send auth msg to mnode", user);
+  dDebug("user:%s, send auth msg to mnodes", user);
  SRpcMsg rpcRsp = {0};
  dnodeSendMsgToDnodeRecv(&rpcMsg, &rpcRsp);

  if (rpcRsp.code != 0) {
-    dError("user:%s, auth msg received from mnode, error:%s", user, tstrerror(rpcRsp.code));
+    dError("user:%s, auth msg received from mnodes, error:%s", user, tstrerror(rpcRsp.code));
  } else {
    SDMAuthRsp *pRsp = rpcRsp.pCont;
-    dDebug("user:%s, auth msg received from mnode", user);
+    dDebug("user:%s, auth msg received from mnodes", user);
    memcpy(secret, pRsp->secret, TSDB_KEY_LEN);
    memcpy(ckey, pRsp->ckey, TSDB_KEY_LEN);
    *spi = pRsp->spi;
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@ -272,6 +272,13 @@ void tsDataSwap(void *pLeft, void *pRight, int32_t type, int32_t size);
 #define TSDB_SHOW_SQL_LEN         64
 #define TSDB_SLOW_QUERY_SQL_LEN   512

+#define TSDB_MQTT_HOSTNAME_LEN    64
+#define TSDB_MQTT_PORT_LEN        8
+#define TSDB_MQTT_USER_LEN        24
+#define TSDB_MQTT_PASS_LEN        24
+#define TSDB_MQTT_TOPIC_LEN       64
+#define TSDB_MQTT_CLIENT_ID_LEN   32
+
 #define TSDB_METER_STATE_OFFLINE  0
 #define TSDB_METER_STATE_ONLLINE  1

--- a/src/inc/tmqtt.h
+++ b/src/inc/tmqtt.h
@ -19,7 +19,7 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-#include <stdint.h>
+
 int32_t mqttInitSystem();
 int32_t mqttStartSystem();
 void    mqttStopSystem();
--- a/src/kit/shell/src/shellEngine.c
+++ b/src/kit/shell/src/shellEngine.c
@ -786,7 +786,7 @@ void read_history() {
 }

 void write_history() {
-  char f_history[128];
+  char f_history[TSDB_FILENAME_LEN];
  get_history_path(f_history);

  FILE *f = fopen(f_history, "w");
--- a/src/kit/shell/src/shellLinux.c
+++ b/src/kit/shell/src/shellLinux.c
@ -409,7 +409,7 @@ void set_terminal_mode() {
  }
 }

-void get_history_path(char *history) { sprintf(history, "%s/%s", getenv("HOME"), HISTORY_FILE); }
+void get_history_path(char *history) { snprintf(history, TSDB_FILENAME_LEN, "%s/%s", getenv("HOME"), HISTORY_FILE); }

 void clearScreen(int ecmd_pos, int cursor_pos) {
  struct winsize w;
--- a/src/mnode/src/mnodeAcct.c
+++ b/src/mnode/src/mnodeAcct.c
@ -211,8 +211,8 @@ static int32_t mnodeCreateRootAcct() {
  strcpy(pAcct->user, TSDB_DEFAULT_USER);
  taosEncryptPass((uint8_t *)TSDB_DEFAULT_PASS, strlen(TSDB_DEFAULT_PASS), pAcct->pass);
  pAcct->cfg = (SAcctCfg){
-    .maxUsers           = 10,
-    .maxDbs             = 64,
+    .maxUsers           = 128,
+    .maxDbs             = 128,
    .maxTimeSeries      = INT32_MAX,
    .maxConnections     = 1024,
    .maxStreams         = 1000,
--- a/src/mnode/src/mnodeDb.c
+++ b/src/mnode/src/mnodeDb.c
@ -242,6 +242,7 @@ static int32_t mnodeCheckDbCfg(SDbCfg *pCfg) {
    return TSDB_CODE_MND_INVALID_DB_OPTION;
  }

+#if 0
  if (pCfg->daysToKeep2 < TSDB_MIN_KEEP || pCfg->daysToKeep2 > pCfg->daysToKeep) {
    mError("invalid db option daysToKeep2:%d valid range: [%d, %d]", pCfg->daysToKeep, TSDB_MIN_KEEP, pCfg->daysToKeep);
    return TSDB_CODE_MND_INVALID_DB_OPTION;
@ -251,6 +252,7 @@ static int32_t mnodeCheckDbCfg(SDbCfg *pCfg) {
    mError("invalid db option daysToKeep1:%d valid range: [%d, %d]", pCfg->daysToKeep1, TSDB_MIN_KEEP, pCfg->daysToKeep2);
    return TSDB_CODE_MND_INVALID_DB_OPTION;
  }
+#endif

  if (pCfg->maxRowsPerFileBlock < TSDB_MIN_MAX_ROW_FBLOCK || pCfg->maxRowsPerFileBlock > TSDB_MAX_MAX_ROW_FBLOCK) {
    mError("invalid db option maxRowsPerFileBlock:%d valid range: [%d, %d]", pCfg->maxRowsPerFileBlock,
@ -310,6 +312,13 @@ static int32_t mnodeCheckDbCfg(SDbCfg *pCfg) {
    return TSDB_CODE_MND_INVALID_DB_OPTION;
  }

+#ifndef _SYNC
+  if (pCfg->replications != 1) {
+    mError("invalid db option replications:%d can only be 1 in this version", pCfg->replications);
+    return TSDB_CODE_MND_INVALID_DB_OPTION;
+  }
+#endif
+
  return TSDB_CODE_SUCCESS;
 }

--- a/src/mnode/src/mnodeDnode.c
+++ b/src/mnode/src/mnodeDnode.c
@ -72,12 +72,16 @@ static int32_t mnodeDnodeActionInsert(SSdbOper *pOper) {
    pDnode->lastAccess = tsAccessSquence;
  }

+  mInfo("dnode:%d, fqdn:%s ep:%s port:%d, do insert action", pDnode->dnodeId, pDnode->dnodeFqdn, pDnode->dnodeEp, pDnode->dnodePort);
  return TSDB_CODE_SUCCESS;
 }

 static int32_t mnodeDnodeActionDelete(SSdbOper *pOper) {
  SDnodeObj *pDnode = pOper->pObj;
 
+#ifndef _SYNC 
+  mnodeDropAllDnodeVgroups(pDnode);
+#endif  
  mnodeDropMnodeLocal(pDnode->dnodeId);
  balanceAsyncNotify();

@ -585,7 +589,11 @@ static int32_t mnodeDropDnodeByEp(char *ep, SMnodeMsg *pMsg) {

  mInfo("dnode:%d, start to drop it", pDnode->dnodeId);

+#ifndef _SYNC
+  int32_t code = mnodeDropDnode(pDnode, pMsg);
+#else
  int32_t code = balanceDropDnode(pDnode);
+#endif  
  mnodeDecDnodeRef(pDnode);
  return code;
 }
@ -1043,3 +1051,59 @@ static char* mnodeGetDnodeAlternativeRoleStr(int32_t alternativeRole) {
  }
 }

+#ifndef _SYNC
+
+int32_t balanceInit() { return TSDB_CODE_SUCCESS; }
+void    balanceCleanUp() {}
+void    balanceAsyncNotify() {}
+void    balanceSyncNotify() {}
+void    balanceReset() {}
+int32_t balanceAlterDnode(struct SDnodeObj *pDnode, int32_t vnodeId, int32_t dnodeId) { return TSDB_CODE_SYN_NOT_ENABLED; }
+
+char* syncRole[] = {
+  "offline",
+  "unsynced",
+  "syncing",
+  "slave",
+  "master"
+};
+
+int32_t balanceAllocVnodes(SVgObj *pVgroup) {
+  void *     pIter = NULL;
+  SDnodeObj *pDnode = NULL;
+  SDnodeObj *pSelDnode = NULL;
+  float      vnodeUsage = 1000.0;
+
+  while (1) {
+    pIter = mnodeGetNextDnode(pIter, &pDnode);
+    if (pDnode == NULL) break;
+
+    if (pDnode->numOfCores > 0 && pDnode->openVnodes < TSDB_MAX_VNODES) {
+      float openVnodes = pDnode->openVnodes;
+      if (pDnode->isMgmt) openVnodes += tsMnodeEqualVnodeNum;
+
+      float usage = openVnodes / pDnode->numOfCores;
+      if (usage <= vnodeUsage) {
+        pSelDnode = pDnode;
+        vnodeUsage = usage;
+      }
+    }
+    mnodeDecDnodeRef(pDnode);
+  }
+
+  sdbFreeIter(pIter);
+
+  if (pSelDnode == NULL) {
+    mError("failed to alloc vnode to vgroup");
+    return TSDB_CODE_MND_NO_ENOUGH_DNODES;
+  }
+
+  pVgroup->vnodeGid[0].dnodeId = pSelDnode->dnodeId;
+  pVgroup->vnodeGid[0].pDnode = pSelDnode;
+
+  mDebug("dnode:%d, alloc one vnode to vgroup, openVnodes:%d", pSelDnode->dnodeId, pSelDnode->openVnodes);
+  return TSDB_CODE_SUCCESS;
+}
+
+#endif 
+
--- a/src/mnode/src/mnodeMnode.c
+++ b/src/mnode/src/mnodeMnode.c
@ -68,6 +68,7 @@ static int32_t mnodeMnodeActionInsert(SSdbOper *pOper) {
  pDnode->isMgmt = true;
  mnodeDecDnodeRef(pDnode);
  
+  mInfo("mnode:%d, fqdn:%s ep:%s port:%d, do insert action", pMnode->mnodeId, pDnode->dnodeFqdn, pDnode->dnodeEp, pDnode->dnodePort);
  return TSDB_CODE_SUCCESS;
 }

--- a/src/mnode/src/mnodeProfile.c
+++ b/src/mnode/src/mnodeProfile.c
@ -98,7 +98,9 @@ SConnObj *mnodeCreateConn(char *user, uint32_t ip, uint16_t port) {
    .connId = connId,
    .stime  = taosGetTimestampMs()
  };
+
  tstrncpy(connObj.user, user, sizeof(connObj.user));
+  connObj.lastAccess = connObj.stime;

  SConnObj *pConn = taosCachePut(tsMnodeConnCache, &connId, sizeof(int32_t), &connObj, sizeof(connObj), CONN_KEEP_TIME * 1000);

@ -244,6 +246,7 @@ static int32_t mnodeRetrieveConns(SShowObj *pShow, char *data, int32_t rows, voi
    cols++;

    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    if (pConnObj->lastAccess < pConnObj->stime) pConnObj->lastAccess = pConnObj->stime;
    *(int64_t *)pWrite = pConnObj->lastAccess;
    cols++;

--- a/src/mnode/src/mnodeSdb.c
+++ b/src/mnode/src/mnodeSdb.c
@ -612,8 +612,8 @@ static int sdbWrite(void *param, void *data, int type) {
  } else if (action == SDB_ACTION_DELETE) {
    void *pRow = sdbGetRowMeta(pTable, pHead->cont);
    if (pRow == NULL) {
-      sdbError("table:%s, failed to get object:%s from wal while dispose delete action", pTable->tableName,
-               pHead->cont);
+      sdbDebug("table:%s, object:%s not exist in hash, ignore delete action", pTable->tableName,
+               sdbGetKeyStr(pTable, pHead->cont));
      return TSDB_CODE_SUCCESS;
    }
    SSdbOper oper = {.table = pTable, .pObj = pRow};
@ -621,8 +621,8 @@ static int sdbWrite(void *param, void *data, int type) {
  } else if (action == SDB_ACTION_UPDATE) {
    void *pRow = sdbGetRowMeta(pTable, pHead->cont);
    if (pRow == NULL) {
-      sdbError("table:%s, failed to get object:%s from wal while dispose update action", pTable->tableName,
-               pHead->cont);
+      sdbDebug("table:%s, object:%s not exist in hash, ignore update action", pTable->tableName,
+               sdbGetKeyStr(pTable, pHead->cont));
      return TSDB_CODE_SUCCESS;
    }
    SSdbOper oper = {.rowSize = pHead->len, .rowData = pHead->cont, .table = pTable};
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@ -1713,12 +1713,18 @@ static int32_t mnodeDoCreateChildTable(SMnodeMsg *pMsg, int32_t tid) {
    }

    pTable->suid = pMsg->pSTable->uid;
-    pTable->uid  = (((uint64_t)pTable->vgId) << 40) + ((((uint64_t)pTable->sid) & ((1ul << 24) - 1ul)) << 16) +
-                  (sdbGetVersion() & ((1ul << 16) - 1ul));
+    pTable->uid = (((uint64_t)pTable->vgId) << 48) + ((((uint64_t)pTable->sid) & ((1ul << 24) - 1ul)) << 24) +
+                  ((sdbGetVersion() & ((1ul << 16) - 1ul)) << 8) + (taosRand() & ((1ul << 8) - 1ul));
    pTable->superTable = pMsg->pSTable;
  } else {
-    pTable->uid = (((uint64_t)pTable->vgId) << 40) + ((((uint64_t)pTable->sid) & ((1ul << 24) - 1ul)) << 16) +
-                  (sdbGetVersion() & ((1ul << 16) - 1ul));
+    if (pTable->info.type == TSDB_SUPER_TABLE) {
+      int64_t us = taosGetTimestampUs();
+      pTable->uid = (us << 24) + ((sdbGetVersion() & ((1ul << 16) - 1ul)) << 8) + (taosRand() & ((1ul << 8) - 1ul));
+    } else {
+      pTable->uid = (((uint64_t)pTable->vgId) << 48) + ((((uint64_t)pTable->sid) & ((1ul << 24) - 1ul)) << 24) +
+                    ((sdbGetVersion() & ((1ul << 16) - 1ul)) << 8) + (taosRand() & ((1ul << 8) - 1ul));
+    }
+
    pTable->sversion     = 0;
    pTable->numOfColumns = htons(pCreate->numOfColumns);
    pTable->sqlLen       = htons(pCreate->sqlLen);
--- a/src/mnode/src/mnodeUser.c
+++ b/src/mnode/src/mnodeUser.c
@ -581,7 +581,7 @@ void mnodeDropAllUsers(SAcctObj *pAcct)  {
 int32_t mnodeRetriveAuth(char *user, char *spi, char *encrypt, char *secret, char *ckey) {
  if (!sdbIsMaster()) {
    *secret = 0;
-    mDebug("user:%s, failed to auth user, reason:%s", user, tstrerror(TSDB_CODE_APP_NOT_READY));
+    mDebug("user:%s, failed to auth user, mnode is not master", user);
    return TSDB_CODE_APP_NOT_READY;
  }

--- a/src/os/inc/osDir.h
+++ b/src/os/inc/osDir.h
@ -24,6 +24,7 @@ extern "C" {
 void taosRemoveDir(char *rootDir);
 int  taosMkDir(const char *pathname, mode_t mode); 
 void taosRename(char* oldName, char *newName);
+void taosRemoveOldLogFiles(char *rootDir, int32_t keepDays);

 #ifdef __cplusplus
 }
--- a/src/os/inc/osWindows.h
+++ b/src/os/inc/osWindows.h
@ -39,6 +39,7 @@
 #include <Winsock2.h>
 #include <time.h>
 #include <inttypes.h>
+#include <conio.h>
 #include "msvcProcess.h"
 #include "msvcDirect.h"
 #include "msvcFcntl.h"
@ -58,8 +59,6 @@ extern "C" {
  int32_t BUILDIN_CTZL(uint64_t val);
  int32_t BUILDIN_CTZ(uint32_t val);

-#define TAOS_OS_FUNC_DIR
-
 #define TAOS_OS_FUNC_FILE
 #define TAOS_OS_FUNC_FILE_ISREG
 #define TAOS_OS_FUNC_FILE_ISDIR
@ -179,9 +178,9 @@ int        gettimeofday(struct timeval *ptv, void *pTimeZone);
 #endif

 #ifdef _MSC_VER
-#if _MSC_VER >= 1900
+//#if _MSC_VER >= 1900
  #define TAOS_OS_FUNC_SOCKET_INET
-#endif
+//#endif
 #endif

 #define SHUT_RDWR                SD_BOTH
--- a/src/os/src/detail/osDir.c
+++ b/src/os/src/detail/osDir.c
@ -18,8 +18,6 @@
 #include "tglobal.h"
 #include "tulog.h"

-#ifndef TAOS_OS_FUNC_DIR
-
 void taosRemoveDir(char *rootDir) {
  DIR *dir = opendir(rootDir);
  if (dir == NULL) return;
@ -51,18 +49,54 @@ int taosMkDir(const char *path, mode_t mode) {
 }

 void taosRename(char* oldName, char *newName) {
-  if (0 == tsEnableVnodeBak) {
-    uInfo("vnode backup not enabled");
-    return;
-  }
-
  // if newName in not empty, rename return fail. 
  // the newName must be empty or does not exist
  if (rename(oldName, newName)) {
-    uError("%s is modify to %s fail, reason:%s", oldName, newName, strerror(errno));
+    uError("failed to rename file %s to %s, reason:%s", oldName, newName, strerror(errno));
  } else {
-    uInfo("%s is modify to %s success!", oldName, newName);
+    uInfo("successfully to rename file %s to %s", oldName, newName);
  }
 }

-#endif
+void taosRemoveOldLogFiles(char *rootDir, int32_t keepDays) {
+  DIR *dir = opendir(rootDir);
+  if (dir == NULL) return;
+
+  int64_t sec = taosGetTimestampSec();
+  struct dirent *de = NULL;
+
+  while ((de = readdir(dir)) != NULL) {
+    if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0) continue;
+
+    char filename[1024];
+    snprintf(filename, 1023, "%s/%s", rootDir, de->d_name);
+    if (de->d_type & DT_DIR) {
+      continue;
+    } else {
+      // struct stat fState;
+      // if (stat(fname, &fState) < 0) {
+      //   continue;
+      // }
+      int32_t len = (int32_t)strlen(filename);
+      int64_t fileSec = 0;
+      for (int i = len - 1; i >= 0; i--) {
+        if (filename[i] == '.') {
+          fileSec = atoll(filename + i + 1);
+          break;
+        }
+      }
+
+      if (fileSec <= 100) continue;
+      int32_t days = (int32_t)(ABS(sec - fileSec) / 86400 + 1);
+      if (days > keepDays) {
+        (void)remove(filename);
+        uInfo("file:%s is removed, days:%d keepDays:%d", filename, days, keepDays);
+      } else {
+        uTrace("file:%s won't be removed, days:%d keepDays:%d", filename, days, keepDays);
+      }
+    }
+  }
+
+  closedir(dir);
+  rmdir(rootDir);
+}
--- a/src/os/src/windows/wDir.c
+++ b/src/os/src/windows/wDir.c
@ -1,31 +0,0 @@
-/*
- * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
- *
- * This program is free software: you can use, redistribute, and/or modify
- * it under the terms of the GNU Affero General Public License, version 3
- * or later ("AGPL"), as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#define _DEFAULT_SOURCE
-#include "os.h"
-#include "tulog.h"
-
-void taosRemoveDir(char *rootDir) {
-  uError("%s not implemented yet", __FUNCTION__);
-}
-
-int taosMkDir(const char *path, mode_t mode) {
-  uError("%s not implemented yet", __FUNCTION__);
-  return 0;
-}
-
-void taosMvDir(char* destDir, char *srcDir) {
-  uError("%s not implemented yet", __FUNCTION__);
-}
--- a/src/os/src/windows/wSocket.c
+++ b/src/os/src/windows/wSocket.c
@ -61,6 +61,10 @@ int taosSetSockOpt(SOCKET socketfd, int level, int optname, void *optval, int op
    return 0;
  }

+   if (level == SOL_TCP && optname == TCP_KEEPCNT) {
+    return 0;
+  }
+
  return setsockopt(socketfd, level, optname, optval, optlen);
 }

--- a/src/os/src/windows/wString.c
+++ b/src/os/src/windows/wString.c
@ -58,11 +58,20 @@ char *strsep(char **stringp, const char *delim) {

 char *getpass(const char *prefix) {
  static char passwd[TSDB_KEY_LEN] = {0};
-
+  memset(passwd, 0, TSDB_KEY_LEN);
  printf("%s", prefix);
-  scanf("%s", passwd);

-  char n = getchar();
+  int32_t index = 0;
+  char    ch;
+  while (index < TSDB_KEY_LEN) {
+    ch = getch();
+    if (ch == '\n' || ch == '\r') {
+      break;
+    } else {
+      passwd[index++] = ch;
+    }
+  }
+
  return passwd;
 }

--- a/src/plugins/CMakeLists.txt
+++ b/src/plugins/CMakeLists.txt
@ -3,4 +3,6 @@ PROJECT(TDengine)

 ADD_SUBDIRECTORY(monitor)
 ADD_SUBDIRECTORY(http)
-ADD_SUBDIRECTORY(mqtt)
+IF (TD_MQTT)
+  ADD_SUBDIRECTORY(mqtt)
+ENDIF ()
--- a/src/plugins/http/CMakeLists.txt
+++ b/src/plugins/http/CMakeLists.txt
@ -11,11 +11,12 @@ AUX_SOURCE_DIRECTORY(src SRC)
  
 IF (TD_LINUX)
  ADD_LIBRARY(http ${SRC})
+  TARGET_LINK_LIBRARIES(http z)

  IF (TD_SOMODE_STATIC)
-    TARGET_LINK_LIBRARIES(http taos_static z)
+    TARGET_LINK_LIBRARIES(http taos_static)
  ELSE ()  
-    TARGET_LINK_LIBRARIES(http taos z)
+    TARGET_LINK_LIBRARIES(http taos)
  ENDIF ()

  IF (TD_ADMIN)
--- a/src/plugins/monitor/CMakeLists.txt
+++ b/src/plugins/monitor/CMakeLists.txt
@ -2,11 +2,11 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
 PROJECT(TDengine)

 INCLUDE_DIRECTORIES(inc)
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/client/inc)
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/query/inc)
 AUX_SOURCE_DIRECTORY(./src SRC)

 IF (TD_LINUX)
-  INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/client/inc)
-  INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/query/inc)
  ADD_LIBRARY(monitor ${SRC})
  
  IF (TD_SOMODE_STATIC)
--- a/src/plugins/monitor/src/monitorMain.c
+++ b/src/plugins/monitor/src/monitorMain.c
@ -25,6 +25,7 @@
 #include "tsclient.h"
 #include "dnode.h"
 #include "monitor.h"
+#include "taoserror.h"

 #define monitorFatal(...) { if (monitorDebugFlag & DEBUG_FATAL) { taosPrintLog("MON FATAL ", 255, __VA_ARGS__); }}
 #define monitorError(...) { if (monitorDebugFlag & DEBUG_ERROR) { taosPrintLog("MON ERROR ", 255, __VA_ARGS__); }}
@ -33,129 +34,159 @@
 #define monitorDebug(...) { if (monitorDebugFlag & DEBUG_DEBUG) { taosPrintLog("MON ", monitorDebugFlag, __VA_ARGS__); }}
 #define monitorTrace(...) { if (monitorDebugFlag & DEBUG_TRACE) { taosPrintLog("MON ", monitorDebugFlag, __VA_ARGS__); }}

-#define SQL_LENGTH     1024
+#define SQL_LENGTH     1030
 #define LOG_LEN_STR    100
 #define IP_LEN_STR     TSDB_EP_LEN
 #define CHECK_INTERVAL 1000

 typedef enum {
-  MONITOR_CMD_CREATE_DB,
-  MONITOR_CMD_CREATE_TB_LOG,
-  MONITOR_CMD_CREATE_MT_DN,
-  MONITOR_CMD_CREATE_MT_ACCT,
-  MONITOR_CMD_CREATE_TB_DN,
-  MONITOR_CMD_CREATE_TB_ACCT_ROOT,
-  MONITOR_CMD_CREATE_TB_SLOWQUERY,
-  MONITOR_CMD_MAX
+  MON_CMD_CREATE_DB,
+  MON_CMD_CREATE_TB_LOG,
+  MON_CMD_CREATE_MT_DN,
+  MON_CMD_CREATE_MT_ACCT,
+  MON_CMD_CREATE_TB_DN,
+  MON_CMD_CREATE_TB_ACCT_ROOT,
+  MON_CMD_CREATE_TB_SLOWQUERY,
+  MON_CMD_MAX
 } EMonitorCommand;

 typedef enum {
-  MONITOR_STATE_UN_INIT,
-  MONITOR_STATE_INITIALIZING,
-  MONITOR_STATE_INITIALIZED,
-  MONITOR_STATE_STOPPED
+  MON_STATE_NOT_INIT,
+  MON_STATE_INITED
 } EMonitorState;

 typedef struct {
+  pthread_t thread;
  void *    conn;
-  void * timer;
  char      ep[TSDB_EP_LEN];
  int8_t    cmdIndex;
  int8_t    state;
+  int8_t    start;   // enable/disable by mnode
+  int8_t    quiting; // taosd is quiting 
  char      sql[SQL_LENGTH + 1];
-  void * initTimer;
-  void * diskTimer;
 } SMonitorConn;

-static SMonitorConn tsMonitorConn;
-static void monitorInitConn(void *para, void *unused);
-static void monitorInitConnCb(void *param, TAOS_RES *result, int32_t code);
-static void monitorInitDatabase();
-static void monitorInitDatabaseCb(void *param, TAOS_RES *result, int32_t code);
-static void monitorStartTimer();
+static SMonitorConn tsMonitor = {0};
 static void  monitorSaveSystemInfo();
+static void *monitorThreadFunc(void *param);
+static void  monitorBuildMonitorSql(char *sql, int32_t cmd);
 extern int32_t (*monitorStartSystemFp)();
 extern void    (*monitorStopSystemFp)();
 extern void    (*monitorExecuteSQLFp)(char *sql);

-static void monitorCheckDiskUsage(void *para, void *unused) {
-  taosGetDisk();
-  taosTmrReset(monitorCheckDiskUsage, CHECK_INTERVAL, NULL, tscTmr, &tsMonitorConn.diskTimer);
-}
-
 int32_t monitorInitSystem() {
-  taos_init();
-  taosTmrReset(monitorCheckDiskUsage, CHECK_INTERVAL, NULL, tscTmr, &tsMonitorConn.diskTimer);
+  if (tsMonitor.ep[0] == 0) {
+    strcpy(tsMonitor.ep, tsLocalEp);
+  }
+
+  int len = strlen(tsMonitor.ep);
+  for (int i = 0; i < len; ++i) {
+    if (tsMonitor.ep[i] == ':' || tsMonitor.ep[i] == '-' || tsMonitor.ep[i] == '.') {
+      tsMonitor.ep[i] = '_';
+    }
+  }
+
+  pthread_attr_t thAttr;
+  pthread_attr_init(&thAttr);
+  pthread_attr_setdetachstate(&thAttr, PTHREAD_CREATE_JOINABLE);
+
+  if (pthread_create(&tsMonitor.thread, &thAttr, monitorThreadFunc, NULL)) {
+    monitorError("failed to create thread to for monitor module, reason:%s", strerror(errno));
+    return -1;
+  }
+
+  pthread_attr_destroy(&thAttr);
+  monitorDebug("monitor thread is launched");
+
  monitorStartSystemFp = monitorStartSystem;
  monitorStopSystemFp = monitorStopSystem;
  return 0;
 }

 int32_t monitorStartSystem() {
-  monitorInfo("start monitor module");
-  monitorInitSystem();
-  taosTmrReset(monitorInitConn, 10, NULL, tscTmr, &tsMonitorConn.initTimer);
+  taos_init();
+  tsMonitor.start = 1;
+  monitorExecuteSQLFp = monitorExecuteSQL;
+  monitorInfo("monitor module start");
  return 0;
 }

-static void monitorStartSystemRetry() {
-  if (tsMonitorConn.initTimer != NULL) {
-    taosTmrReset(monitorInitConn, 3000, NULL, tscTmr, &tsMonitorConn.initTimer);
-  }
-}
+static void *monitorThreadFunc(void *param) {
+  monitorDebug("starting to initialize monitor module ...");

-static void monitorInitConn(void *para, void *unused) {
-  if (dnodeGetDnodeId() <= 0) {
-    monitorStartSystemRetry();
-    return;
-  }
+  while (1) {
+    static int32_t accessTimes = 0;
+    accessTimes++;
+    taosMsleep(1000);

-  monitorInfo("starting to initialize monitor service ..");
-  tsMonitorConn.state = MONITOR_STATE_INITIALIZING;
-
-  if (tsMonitorConn.ep[0] == 0) 
-    strcpy(tsMonitorConn.ep, tsLocalEp);
-
-  int len = strlen(tsMonitorConn.ep);
-  for (int i = 0; i < len; ++i) {
-    if (tsMonitorConn.ep[i] == ':' || tsMonitorConn.ep[i] == '-') {
-      tsMonitorConn.ep[i] = '_';
-    }
-  }
-
-  if (tsMonitorConn.conn == NULL) {
-    taos_connect_a(NULL, "monitor", tsInternalPass, "", 0, monitorInitConnCb, &tsMonitorConn, &(tsMonitorConn.conn));
+    if (tsMonitor.quiting) {
+      tsMonitor.state = MON_STATE_NOT_INIT;
+      monitorInfo("monitor thread will quit, for taosd is quiting");
+      break;
    } else {
-    monitorInitDatabase();
-  }
-}
-
-static void monitorInitConnCb(void *param, TAOS_RES *result, int32_t code) {
-  // free it firstly in any cases.
-  taos_free_result(result);
-
-  if (code != TSDB_CODE_SUCCESS) {
-    monitorError("monitor:%p, connect to database failed, reason:%s", tsMonitorConn.conn, tstrerror(code));
-    taos_close(tsMonitorConn.conn);
-    tsMonitorConn.conn = NULL;
-    tsMonitorConn.state = MONITOR_STATE_UN_INIT;
-    monitorStartSystemRetry();
-    return;
+      taosGetDisk();
    }

-  monitorDebug("monitor:%p, connect to database success, reason:%s", tsMonitorConn.conn, tstrerror(code));
-  monitorInitDatabase();
+    if (tsMonitor.start == 0) {
+      continue;
+    }
+    
+    if (dnodeGetDnodeId() <= 0) {
+      monitorDebug("dnode not initialized, waiting for 3000 ms to start monitor module");
+      continue;
+    }
+
+    if (tsMonitor.conn == NULL) {
+      tsMonitor.state = MON_STATE_NOT_INIT;
+      tsMonitor.conn = taos_connect(NULL, "monitor", tsInternalPass, "", 0);
+      if (tsMonitor.conn == NULL) {
+        monitorError("failed to connect to database, reason:%s", tstrerror(terrno));
+        continue;
+      } else {
+        monitorDebug("connect to database success");
+      }
+    }
+
+    if (tsMonitor.state == MON_STATE_NOT_INIT) {
+      for (; tsMonitor.cmdIndex < MON_CMD_MAX; ++tsMonitor.cmdIndex) {
+        monitorBuildMonitorSql(tsMonitor.sql, tsMonitor.cmdIndex);
+        void *res = taos_query(tsMonitor.conn, tsMonitor.sql);
+        int   code = taos_errno(res);
+        taos_free_result(res);
+
+        if (code != 0) {
+          monitorError("failed to exec sql:%s, reason:%s", tsMonitor.sql, tstrerror(code));
+          break;
+        } else {
+          monitorDebug("successfully to exec sql:%s", tsMonitor.sql);
+        }
+      }
+
+      if (tsMonitor.start) {
+        tsMonitor.state = MON_STATE_INITED;
+      }
+    }
+
+    if (tsMonitor.state == MON_STATE_INITED) {
+      if (accessTimes % tsMonitorInterval == 0) {
+        monitorSaveSystemInfo();
+      }
+    }
+  }
+
+  monitorInfo("monitor thread is stopped");
+  return NULL;
 }

-static void dnodeBuildMonitorSql(char *sql, int32_t cmd) {
+static void monitorBuildMonitorSql(char *sql, int32_t cmd) {
  memset(sql, 0, SQL_LENGTH);

-  if (cmd == MONITOR_CMD_CREATE_DB) {
+  if (cmd == MON_CMD_CREATE_DB) {
    snprintf(sql, SQL_LENGTH,
             "create database if not exists %s replica 1 days 10 keep 30 cache %d "
-             "blocks %d maxtables 16 precision 'us'",
+             "blocks %d precision 'us'",
             tsMonitorDbName, TSDB_MIN_CACHE_BLOCK_SIZE, TSDB_MIN_TOTAL_BLOCKS);
-  } else if (cmd == MONITOR_CMD_CREATE_MT_DN) {
+  } else if (cmd == MON_CMD_CREATE_MT_DN) {
    snprintf(sql, SQL_LENGTH,
             "create table if not exists %s.dn(ts timestamp"
             ", cpu_taosd float, cpu_system float, cpu_cores int"
@ -166,10 +197,10 @@ static void dnodeBuildMonitorSql(char *sql, int32_t cmd) {
             ", req_http int, req_select int, req_insert int"
             ") tags (dnodeid int, fqdn binary(%d))",
             tsMonitorDbName, TSDB_FQDN_LEN);
-  } else if (cmd == MONITOR_CMD_CREATE_TB_DN) {
+  } else if (cmd == MON_CMD_CREATE_TB_DN) {
    snprintf(sql, SQL_LENGTH, "create table if not exists %s.dn%d using %s.dn tags(%d, '%s')", tsMonitorDbName,
             dnodeGetDnodeId(), tsMonitorDbName, dnodeGetDnodeId(), tsLocalEp);
-  } else if (cmd == MONITOR_CMD_CREATE_MT_ACCT) {
+  } else if (cmd == MON_CMD_CREATE_MT_ACCT) {
    snprintf(sql, SQL_LENGTH,
             "create table if not exists %s.acct(ts timestamp "
             ", currentPointsPerSecond bigint, maxPointsPerSecond bigint"
@ -185,15 +216,15 @@ static void dnodeBuildMonitorSql(char *sql, int32_t cmd) {
             ", accessState smallint"
             ") tags (acctId binary(%d))",
             tsMonitorDbName, TSDB_USER_LEN);
-  } else if (cmd == MONITOR_CMD_CREATE_TB_ACCT_ROOT) {
+  } else if (cmd == MON_CMD_CREATE_TB_ACCT_ROOT) {
    snprintf(sql, SQL_LENGTH, "create table if not exists %s.acct_%s using %s.acct tags('%s')", tsMonitorDbName, TSDB_DEFAULT_USER,
             tsMonitorDbName, TSDB_DEFAULT_USER);
-  } else if (cmd == MONITOR_CMD_CREATE_TB_SLOWQUERY) {
+  } else if (cmd == MON_CMD_CREATE_TB_SLOWQUERY) {
    snprintf(sql, SQL_LENGTH,
             "create table if not exists %s.slowquery(ts timestamp, username "
             "binary(%d), created_time timestamp, time bigint, sql binary(%d))",
             tsMonitorDbName, TSDB_TABLE_FNAME_LEN - 1, TSDB_SLOW_QUERY_SQL_LEN);
-  } else if (cmd == MONITOR_CMD_CREATE_TB_LOG) {
+  } else if (cmd == MON_CMD_CREATE_TB_LOG) {
    snprintf(sql, SQL_LENGTH,
             "create table if not exists %s.log(ts timestamp, level tinyint, "
             "content binary(%d), ipaddr binary(%d))",
@ -203,75 +234,22 @@ static void dnodeBuildMonitorSql(char *sql, int32_t cmd) {
  sql[SQL_LENGTH] = 0;
 }

-static void monitorInitDatabase() {
-  if (tsMonitorConn.cmdIndex < MONITOR_CMD_MAX) {
-    dnodeBuildMonitorSql(tsMonitorConn.sql, tsMonitorConn.cmdIndex);
-    taos_query_a(tsMonitorConn.conn, tsMonitorConn.sql, monitorInitDatabaseCb, NULL);
-  } else {
-    tsMonitorConn.state = MONITOR_STATE_INITIALIZED;
-    monitorExecuteSQLFp = monitorExecuteSQL;
-    monitorInfo("monitor service init success");
-
-    monitorStartTimer();
-  }
-}
-
-static void monitorInitDatabaseCb(void *param, TAOS_RES *result, int32_t code) {
-  if (code == TSDB_CODE_MND_TABLE_ALREADY_EXIST || code == TSDB_CODE_MND_DB_ALREADY_EXIST || code >= 0) {
-    monitorDebug("monitor:%p, sql success, reason:%s, %s", tsMonitorConn.conn, tstrerror(code), tsMonitorConn.sql);
-    if (tsMonitorConn.cmdIndex == MONITOR_CMD_CREATE_TB_LOG) {
-      monitorInfo("dnode:%s is started", tsLocalEp);
-    }
-    tsMonitorConn.cmdIndex++;
-    monitorInitDatabase();
-  } else {
-    monitorError("monitor:%p, sql failed, reason:%s, %s", tsMonitorConn.conn, tstrerror(code), tsMonitorConn.sql);
-    tsMonitorConn.state = MONITOR_STATE_UN_INIT;
-    monitorStartSystemRetry();
-  }
-
-  taos_free_result(result);
-}
-
 void monitorStopSystem() {
-  if (tsMonitorConn.state == MONITOR_STATE_STOPPED) return;
-  tsMonitorConn.state = MONITOR_STATE_STOPPED;
+  tsMonitor.start = 0;
+  tsMonitor.state = MON_STATE_NOT_INIT;
  monitorExecuteSQLFp = NULL;
-
-  monitorInfo("monitor module is stopped");
-
-  if (tsMonitorConn.initTimer != NULL) {
-    taosTmrStopA(&(tsMonitorConn.initTimer));
-  }
-  if (tsMonitorConn.timer != NULL) {
-    taosTmrStopA(&(tsMonitorConn.timer));
-  }
-  if (tsMonitorConn.conn != NULL) {
-    taos_close(tsMonitorConn.conn);
-    tsMonitorConn.conn = NULL;
-  }
+  monitorInfo("monitor module stopped");
 }

 void monitorCleanUpSystem() {
+  tsMonitor.quiting = 1;
  monitorStopSystem();
-  monitorInfo("monitor module cleanup");
-}
-
-static void monitorStartTimer() {
-  taosTmrReset(monitorSaveSystemInfo, tsMonitorInterval * 1000, NULL, tscTmr, &tsMonitorConn.timer);
-}
-
-static void dnodeMontiorLogCallback(void *param, TAOS_RES *result, int32_t code) {
-  int32_t c = taos_errno(result);
-
-  if (c != TSDB_CODE_SUCCESS) {
-    monitorError("monitor:%p, save %s failed, reason:%s", tsMonitorConn.conn, (char *)param, tstrerror(c));
-  } else {
-    int32_t rows = taos_affected_rows(result);
-    monitorDebug("monitor:%p, save %s succ, rows:%d", tsMonitorConn.conn, (char *)param, rows);
+  pthread_join(tsMonitor.thread, NULL);
+  if (tsMonitor.conn != NULL) {
+    taos_close(tsMonitor.conn);
+    tsMonitor.conn = NULL;
  }
-
-  taos_free_result(result);
+  monitorInfo("monitor module is cleaned up");
 }

 // unit is MB
@ -279,13 +257,13 @@ static int32_t monitorBuildMemorySql(char *sql) {
  float sysMemoryUsedMB = 0;
  bool  suc = taosGetSysMemory(&sysMemoryUsedMB);
  if (!suc) {
-    monitorError("monitor:%p, get sys memory info failed.", tsMonitorConn.conn);
+    monitorDebug("failed to get sys memory info");
  }

  float procMemoryUsedMB = 0;
  suc = taosGetProcMemory(&procMemoryUsedMB);
  if (!suc) {
-    monitorError("monitor:%p, get proc memory info failed.", tsMonitorConn.conn);
+    monitorDebug("failed to get proc memory info");
  }

  return sprintf(sql, ", %f, %f, %d", procMemoryUsedMB, sysMemoryUsedMB, tsTotalMemoryMB);
@ -296,11 +274,11 @@ static int32_t monitorBuildCpuSql(char *sql) {
  float sysCpuUsage = 0, procCpuUsage = 0;
  bool  suc = taosGetCpuUsage(&sysCpuUsage, &procCpuUsage);
  if (!suc) {
-    monitorError("monitor:%p, get cpu usage failed.", tsMonitorConn.conn);
+    monitorDebug("failed to get cpu usage");
  }

  if (sysCpuUsage <= procCpuUsage) {
-    sysCpuUsage = procCpuUsage + (float)0.1;
+    sysCpuUsage = procCpuUsage + 0.1f;
  }

  return sprintf(sql, ", %f, %f, %d", procCpuUsage, sysCpuUsage, tsNumOfCores);
@ -316,7 +294,7 @@ static int32_t monitorBuildBandSql(char *sql) {
  float bandSpeedKb = 0;
  bool  suc = taosGetBandSpeed(&bandSpeedKb);
  if (!suc) {
-    monitorError("monitor:%p, get bandwidth speed failed.", tsMonitorConn.conn);
+    monitorDebug("failed to get bandwidth speed");
  }

  return sprintf(sql, ", %f", bandSpeedKb);
@ -331,20 +309,15 @@ static int32_t monitorBuildIoSql(char *sql) {
  float readKB = 0, writeKB = 0;
  bool  suc = taosGetProcIO(&readKB, &writeKB);
  if (!suc) {
-    monitorError("monitor:%p, get io info failed.", tsMonitorConn.conn);
+    monitorDebug("failed to get io info");
  }

  return sprintf(sql, ", %f, %f", readKB, writeKB);
 }

 static void monitorSaveSystemInfo() {
-  if (tsMonitorConn.state != MONITOR_STATE_INITIALIZED) {
-    monitorStartTimer();
-    return;
-  }
-
  int64_t ts = taosGetTimestampUs();
-  char *  sql = tsMonitorConn.sql;
+  char *  sql = tsMonitor.sql;
  int32_t pos = snprintf(sql, SQL_LENGTH, "insert into %s.dn%d values(%" PRId64, tsMonitorDbName, dnodeGetDnodeId(), ts);

  pos += monitorBuildCpuSql(sql + pos);
@ -354,16 +327,31 @@ static void monitorSaveSystemInfo() {
  pos += monitorBuildIoSql(sql + pos);
  pos += monitorBuildReqSql(sql + pos);

-  monitorDebug("monitor:%p, save system info, sql:%s", tsMonitorConn.conn, sql);
-  taos_query_a(tsMonitorConn.conn, sql, dnodeMontiorLogCallback, "sys");
+  void *res = taos_query(tsMonitor.conn, tsMonitor.sql);
+  int   code = taos_errno(res);
+  taos_free_result(res);

-  if (tsMonitorConn.timer != NULL && tsMonitorConn.state != MONITOR_STATE_STOPPED) {
-    monitorStartTimer();
+  if (code != 0) {
+    monitorError("failed to save system info, reason:%s, sql:%s", tstrerror(code), tsMonitor.sql);
+  } else {
+    monitorDebug("successfully to save system info, sql:%s", tsMonitor.sql);
  }
 }

+static void montiorExecSqlCb(void *param, TAOS_RES *result, int32_t code) {
+  int32_t c = taos_errno(result);
+  if (c != TSDB_CODE_SUCCESS) {
+    monitorError("save %s failed, reason:%s", (char *)param, tstrerror(c));
+  } else {
+    int32_t rows = taos_affected_rows(result);
+    monitorDebug("save %s succ, rows:%d", (char *)param, rows);
+  }
+
+  taos_free_result(result);
+}
+
 void monitorSaveAcctLog(SAcctMonitorObj *pMon) {
-  if (tsMonitorConn.state != MONITOR_STATE_INITIALIZED) return;
+  if (tsMonitor.state != MON_STATE_INITED) return;

  char sql[1024] = {0};
  sprintf(sql,
@ -392,19 +380,16 @@ void monitorSaveAcctLog(SAcctMonitorObj *pMon) {
          pMon->totalConns, pMon->maxConns,
          pMon->accessState);

-  monitorDebug("monitor:%p, save account info, sql %s", tsMonitorConn.conn, sql);
-  taos_query_a(tsMonitorConn.conn, sql, dnodeMontiorLogCallback, "account");
+  monitorDebug("save account info, sql:%s", sql);
+  taos_query_a(tsMonitor.conn, sql, montiorExecSqlCb, "account info");
 }

 void monitorSaveLog(int32_t level, const char *const format, ...) {
-  if (tsMonitorConn.state != MONITOR_STATE_INITIALIZED) return;
+  if (tsMonitor.state != MON_STATE_INITED) return;

  va_list argpointer;
  char    sql[SQL_LENGTH] = {0};
  int32_t max_length = SQL_LENGTH - 30;
-
-  if (tsMonitorConn.state != MONITOR_STATE_INITIALIZED) return;
-
  int32_t len = snprintf(sql, (size_t)max_length, "insert into %s.log values(%" PRId64 ", %d,'", tsMonitorDbName,
                         taosGetTimestampUs(), level);

@ -416,12 +401,13 @@ void monitorSaveLog(int32_t level, const char *const format, ...) {
  len += sprintf(sql + len, "', '%s')", tsLocalEp);
  sql[len++] = 0;

-  monitorDebug("monitor:%p, save log, sql: %s", tsMonitorConn.conn, sql);
-  taos_query_a(tsMonitorConn.conn, sql, dnodeMontiorLogCallback, "log");
+  monitorDebug("save log, sql: %s", sql);
+  taos_query_a(tsMonitor.conn, sql, montiorExecSqlCb, "log");
 }

 void monitorExecuteSQL(char *sql) {
-  if (tsMonitorConn.state != MONITOR_STATE_INITIALIZED) return;
-  monitorDebug("monitor:%p, execute sql: %s", tsMonitorConn.conn, sql);
-  taos_query_a(tsMonitorConn.conn, sql, dnodeMontiorLogCallback, "sql");
+  if (tsMonitor.state != MON_STATE_INITED) return;
+
+  monitorDebug("execute sql:%s", sql);
+  taos_query_a(tsMonitor.conn, sql, montiorExecSqlCb, "sql");
 }
--- a/src/plugins/mqtt/CMakeLists.txt
+++ b/src/plugins/mqtt/CMakeLists.txt
@ -2,21 +2,19 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
 PROJECT(TDengine)

 INCLUDE_DIRECTORIES(inc)
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/client/inc)
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/query/inc)
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/deps/MQTT-C/include)
+INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/deps/MQTT-C/examples/templates)
 AUX_SOURCE_DIRECTORY(src SRC)

 IF (TD_LINUX)
-  INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/client/inc)
-  INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/query/inc)
-  INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/deps/MQTT-C/include)
-  INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/deps/MQTT-C/examples/templates)
  ADD_LIBRARY(mqtt ${SRC})
+  TARGET_LINK_LIBRARIES(mqtt cJson mqttc)

  IF (TD_SOMODE_STATIC)
-    TARGET_LINK_LIBRARIES(mqtt taos_static cJson mqttc)
+    TARGET_LINK_LIBRARIES(mqtt taos_static)
  ELSE ()
-    TARGET_LINK_LIBRARIES(mqtt taos cJson mqttc)
-  ENDIF ()
-  IF (TD_ADMIN)
-    TARGET_LINK_LIBRARIES(mqtt admin cJson)
+    TARGET_LINK_LIBRARIES(mqtt taos)
  ENDIF ()
 ENDIF ()
--- a/src/plugins/mqtt/inc/mqttInit.h
+++ b/src/plugins/mqtt/inc/mqttInit.h
@ -23,11 +23,12 @@ extern "C" {
 * @file
 * A simple subscriber program that performs automatic reconnections.
 */
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
 #include "mqtt.h"
-#include "taos.h"
+
+#define QOS                1
+#define TIMEOUT            10000L
+#define MQTT_SEND_BUF_SIZE 102400
+#define MQTT_RECV_BUF_SIZE 102400

 /**
 * @brief A structure that I will use to keep track of some data needed
@ -36,18 +37,12 @@ extern "C" {
 * An instance of this struct will be created in my \c main(). Then, whenever
 * \ref mqttReconnectClient is called, this instance will be passed.
 */
-struct reconnect_state_t {
-  char*    hostname;
-  char*    port;
-  char*    topic;
-  char*    client_id;
-  char*    user_name;
-  char*    password;
+typedef struct SMqttReconnectState {
  uint8_t* sendbuf;
  size_t   sendbufsz;
  uint8_t* recvbuf;
  size_t   recvbufsz;
-};
+} SMqttReconnectState;

 /**
 * @brief My reconnect callback. It will reestablish the connection whenever
@ -58,7 +53,7 @@ void mqttReconnectClient(struct mqtt_client* client, void** reconnect_state_vptr
 /**
 * @brief The function will be called whenever a PUBLISH message is received.
 */
-void mqtt_PublishCallback(void** unused, struct mqtt_response_publish* published);
+void mqttPublishCallback(void** unused, struct mqtt_response_publish* published);

 /**
 * @brief The client's refresher. This function triggers back-end routines to
@ -73,12 +68,7 @@ void* mqttClientRefresher(void* client);
 /**
 * @brief Safelty closes the \p sockfd and cancels the \p client_daemon before \c exit.
 */
-
-void mqttCleanup(int status, int sockfd, pthread_t* client_daemon);
-void mqttInitConnCb(void* param, TAOS_RES* result, int32_t code);
-void mqttQueryInsertCallback(void* param, TAOS_RES* result, int32_t code);
-#define QOS 1
-#define TIMEOUT 10000L
+void mqttCleanupRes(int status, int sockfd, pthread_t* client_daemon);

 #ifdef __cplusplus
 }
--- a/src/plugins/mqtt/inc/mqttPayload.h
+++ b/src/plugins/mqtt/inc/mqttPayload.h
@ -15,11 +15,13 @@

 #ifndef TDENGINE_MQTT_PLYLOAD_H
 #define TDENGINE_MQTT_PLYLOAD_H
+
 #ifdef __cplusplus
 extern "C" {
 #endif
-char  split(char str[], char delims[], char** p_p_cmd_part, int max);
-char* converJsonToSql(char* json, char* _dbname, char* _tablename);
+
+char* mqttConverJsonToSql(char* json, int maxSize);
+
 #ifdef __cplusplus
 }
 #endif
--- a/src/plugins/mqtt/inc/mqttSystem.h
+++ b/src/plugins/mqtt/inc/mqttSystem.h
@ -1,30 +0,0 @@
-/*
- * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
- *
- * This program is free software: you can use, redistribute, and/or modify
- * it under the terms of the GNU Affero General Public License, version 3
- * or later ("AGPL"), as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef TDENGINE_MQTT_SYSTEM_H
-#define TDENGINE_MQTT_SYSTEM_H
-#ifdef __cplusplus
-extern "C" {
-#endif
-#include <stdint.h>
-int32_t mqttInitSystem();
-int32_t mqttStartSystem();
-void    mqttStopSystem();
-void    mqttCleanUpSystem();
-#ifdef __cplusplus
-}
-#endif
-
-#endif
--- a/src/plugins/mqtt/src/mqttPayload.c
+++ b/src/plugins/mqtt/src/mqttPayload.c
@ -14,52 +14,146 @@
 */

 #define _DEFAULT_SOURCE
-#include "mqttPayload.h"
-#include "cJSON.h"
-#include "string.h"
-#include "taos.h"
-#include "mqttLog.h"
 #include "os.h"
-char split(char str[], char delims[], char** p_p_cmd_part, int max) {
-  char*  token = strtok(str, delims);
-  char   part_index = 0;
-  char** tmp_part = p_p_cmd_part;
-  while (token) {
-    *tmp_part++ = token;
-    token = strtok(NULL, delims);
-    part_index++;
-    if (part_index >= max) break;
-  }
-  return part_index;
-}
+#include "cJSON.h"
+#include "mqttLog.h"
+#include "mqttPayload.h"

-char* converJsonToSql(char* json, char* _dbname, char* _tablename) {
-  cJSON* jPlayload = cJSON_Parse(json);
-  char   _names[102400] = {0};
-  char   _values[102400] = {0};
-  int    i = 0;
-  int    count = cJSON_GetArraySize(jPlayload);
-  for (; i < count; i++)  
+// subscribe message like this
+
+/*
+/test {
+    "timestamp": 1599121290,
+    "gateway": {
+        "name": "AcuLink 810 Gateway",
+        "model": "AcuLink810-868",
+        "serial": "S8P20200207"
+    },
+    "device": {
+        "name": "Acuvim L V3 .221",
+        "model": "Acuvim-L-V3",
+        "serial": "221",
+        "online": true,
+        "readings": [
            {
-    cJSON* item = cJSON_GetArrayItem(jPlayload, i);
-    if (cJSON_Object == item->type) {
-      mqttInfo("The item '%s' is not supported", item->string);
-    } else {
-      strcat(_names, item->string);
-      if (i < count - 1) {
-        strcat(_names, ",");
+                "param": "Freq_Hz",
+                "value": "59.977539",
+                "unit": "Hz"
+            },
+            {
+                "param": "Va_V",
+                "value": "122.002907",
+                "unit": "V"
+            },
+            {
+                "param": "DI4",
+                "value": "5.000000",
+                "unit": ""
            }
-      char* __value_json = cJSON_Print(item);
-      strcat(_values, __value_json);
-      free(__value_json);
-      if (i < count - 1) {
-        strcat(_values, ",");
+        ]
    }
-    }
-  }
-  cJSON_free(jPlayload);
-  int   sqllen = strlen(_names) + strlen(_values) + strlen(_dbname) + strlen(_tablename) + 1024;
-  char* _sql = calloc(1, sqllen);
-  sprintf(_sql, "INSERT INTO %s.%s (%s) VALUES(%s);", _dbname, _tablename, _names, _values);
-  return _sql;
+}
+*/
+
+// send msg cmd
+// mosquitto_pub -h test.mosquitto.org  -t "/test" -m '{"timestamp": 1599121290,"gateway": {"name": "AcuLink 810 Gateway","model": "AcuLink810-868","serial": "S8P20200207"},"device": {"name": "Acuvim L V3 .221","model": "Acuvim-L-V3","serial": "221","online": true,"readings": [{"param": "Freq_Hz","value": "59.977539","unit": "Hz"},{"param": "Va_V","value": "122.002907","unit": "V"},{"param": "DI4","value": "5.000000","unit": ""}]}}'
+
+/*
+ * This is an example, this function needs to be implemented in order to parse the json file into a sql statement
+ * Note that you need to create a super table and database before writing data
+ * In this case:
+ *   create database mqttdb;
+ *   create table mqttdb.devices(ts timestamp, value bigint) tags(name binary(32), model binary(32), serial binary(16), param binary(16), unit binary(16));
+ */
+
+char* mqttConverJsonToSql(char* json, int maxSize) {
+  // const int32_t maxSize = 10240;
+  maxSize *= 5;
+  char* sql = malloc(maxSize);
+
+  cJSON* root = cJSON_Parse(json);
+  if (root == NULL) {
+    mqttError("failed to parse msg, invalid json format");
+    goto MQTT_PARSE_OVER;
+  }
+
+  cJSON* timestamp = cJSON_GetObjectItem(root, "timestamp");
+  if (!timestamp || timestamp->type != cJSON_Number) {
+    mqttError("failed to parse msg, timestamp not found");
+    goto MQTT_PARSE_OVER;
+  }
+
+  cJSON* device = cJSON_GetObjectItem(root, "device");
+  if (!device) {
+    mqttError("failed to parse msg, device not found");
+    goto MQTT_PARSE_OVER;
+  }
+
+  cJSON* name = cJSON_GetObjectItem(device, "name");
+  if (!name || name->type != cJSON_String) {
+    mqttError("failed to parse msg, name not found");
+    goto MQTT_PARSE_OVER;
+  }
+
+  cJSON* model = cJSON_GetObjectItem(device, "model");
+  if (!model || model->type != cJSON_String) {
+    mqttError("failed to parse msg, model not found");
+    goto MQTT_PARSE_OVER;
+  }
+
+  cJSON* serial = cJSON_GetObjectItem(device, "serial");
+  if (!serial || serial->type != cJSON_String) {
+    mqttError("failed to parse msg, serial not found");
+    goto MQTT_PARSE_OVER;
+  }
+
+  cJSON* readings = cJSON_GetObjectItem(device, "readings");
+  if (!readings || readings->type != cJSON_Array) {
+    mqttError("failed to parse msg, readings not found");
+    goto MQTT_PARSE_OVER;
+  }
+
+  int count = cJSON_GetArraySize(readings);
+  if (count <= 0) {
+    mqttError("failed to parse msg, readings size smaller than 0");
+    goto MQTT_PARSE_OVER;
+  }
+
+  int len = snprintf(sql, maxSize, "insert into");
+
+  for (int i = 0; i < count; ++i) {
+    cJSON* reading = cJSON_GetArrayItem(readings, i);
+    if (reading == NULL) continue;
+
+    cJSON* param = cJSON_GetObjectItem(reading, "param");
+    if (!param || param->type != cJSON_String) {
+      mqttError("failed to parse msg, param not found");
+      goto MQTT_PARSE_OVER;
+    }
+
+    cJSON* value = cJSON_GetObjectItem(reading, "value");
+    if (!value || value->type != cJSON_String) {
+      mqttError("failed to parse msg, value not found");
+      goto MQTT_PARSE_OVER;
+    }
+
+    cJSON* unit = cJSON_GetObjectItem(reading, "unit");
+    if (!unit || unit->type != cJSON_String) {
+      mqttError("failed to parse msg, unit not found");
+      goto MQTT_PARSE_OVER;
+    }
+
+    len += snprintf(sql + len, maxSize - len,
+        " mqttdb.serial_%s_%s using mqttdb.devices tags('%s', '%s', '%s', '%s', '%s') values(%" PRId64 ", %s)",
+        serial->valuestring, param->valuestring, name->valuestring, model->valuestring, serial->valuestring,
+        param->valuestring, unit->valuestring, timestamp->valueint * 1000, value->valuestring);
+  }
+
+  cJSON_free(root);
+  return sql;
+
+MQTT_PARSE_OVER:
+  cJSON_free(root);
+  free(sql);
+  return NULL;
 }
--- a/src/plugins/mqtt/src/mqttSystem.c
+++ b/src/plugins/mqtt/src/mqttSystem.c
@ -14,244 +14,131 @@
 */

 #define _DEFAULT_SOURCE
-
-#include "cJSON.h"
+#include "os.h"
 #include "mqtt.h"
 #include "mqttInit.h"
 #include "mqttLog.h"
 #include "mqttPayload.h"
-#include "os.h"
+#include "tmqtt.h"
 #include "posix_sockets.h"
-#include "string.h"
 #include "taos.h"
 #include "tglobal.h"
-#include "tmqtt.h"
-#include "tsclient.h"
-#include "tsocket.h"
-#include "ttimer.h"
-#include "mqttSystem.h"
-struct mqtt_client       mqttClient = {0};
-pthread_t                clientDaemonThread = {0};
-void*                    mqttConnect=NULL;
-struct reconnect_state_t recntStatus = {0};
-char*                    topicPath=NULL;
-int                      mttIsRuning = 1;
+#include "taoserror.h"

-int32_t mqttInitSystem() {
-  int   rc = 0;
-#if 0
-  uint8_t sendbuf[2048];
-  uint8_t recvbuf[1024];
-  recntStatus.sendbuf = sendbuf;
-  recntStatus.sendbufsz = sizeof(sendbuf);
-  recntStatus.recvbuf = recvbuf;
-  recntStatus.recvbufsz = sizeof(recvbuf);
-  char* url = tsMqttBrokerAddress;
-  recntStatus.user_name = strstr(url, "@") != NULL ? strbetween(url, "//", ":") : NULL;
+struct SMqttReconnectState tsMqttStatus = {0};
+struct mqtt_client tsMqttClient = {0};
+static pthread_t   tsMqttClientDaemonThread = {0};
+static void*       tsMqttConnect = NULL;
+static bool        tsMqttIsRuning = false;

-  char * passStr = strstr(url, recntStatus.user_name);
-  if (passStr != NULL) {
-    recntStatus.password = strstr(url, "@") != NULL ? strbetween(passStr, ":", "@") : NULL;
-  }
-
-  if (strlen(url) == 0) {
-    mqttDebug("mqtt module not init, url is null");
-    return rc;
-  }
-
-  if (strstr(url, "@") != NULL) {
-    recntStatus.hostname = strbetween(url, "@", ":");
-  } else if (strstr(strstr(url, "://") + 3, ":") != NULL) {
-    recntStatus.hostname = strbetween(url, "//", ":");
-
-  } else {
-    recntStatus.hostname = strbetween(url, "//", "/");
-  }
-
-  char* _begin_hostname = strstr(url, recntStatus.hostname);
-  if (_begin_hostname != NULL && strstr(_begin_hostname, ":") != NULL) {
-    recntStatus.port = strbetween(_begin_hostname, ":", "/");
-  } else {
-    recntStatus.port = strbetween("'1883'", "'", "'");
-  }
-
-  char* portStr = recntStatus.hostname;
-  if (_begin_hostname != NULL) {
-    char* colonStr = strstr(_begin_hostname, ":");
-    if (colonStr != NULL) {
-      portStr = recntStatus.port;
-    }
-  }
-
-  char* topicStr = strstr(url, portStr);
-  if (topicStr != NULL) {
-    topicPath = strbetween(topicStr, "/", "/");
-    char* _topic = "+/+/+/";
-    int   _tpsize = strlen(topicPath) + strlen(_topic) + 1;
-    recntStatus.topic = calloc(1, _tpsize);
-    sprintf(recntStatus.topic, "/%s/%s", topicPath, _topic);
-    recntStatus.client_id = strlen(tsMqttBrokerClientId) < 3 ? tsMqttBrokerClientId : "taos_mqtt";
-    mqttConnect = NULL;
-  } else {
-    topicPath = NULL;
-  }
-  
-#endif  
-  return rc;
-}
+int32_t mqttInitSystem() { return 0; }

 int32_t mqttStartSystem() {
-  int rc = 0;
-#if 0  
-  if (recntStatus.user_name != NULL && recntStatus.password != NULL) {
-    mqttInfo("connecting to  mqtt://%s:%s@%s:%s/%s/", recntStatus.user_name, recntStatus.password,
-              recntStatus.hostname, recntStatus.port, topicPath);
-  } else if (recntStatus.user_name != NULL && recntStatus.password == NULL) {
-    mqttInfo("connecting to  mqtt://%s@%s:%s/%s/", recntStatus.user_name, recntStatus.hostname, recntStatus.port,
-              topicPath);
+  tsMqttStatus.sendbufsz = MQTT_SEND_BUF_SIZE;
+  tsMqttStatus.recvbufsz = MQTT_RECV_BUF_SIZE;
+  tsMqttStatus.sendbuf = malloc(MQTT_SEND_BUF_SIZE);
+  tsMqttStatus.recvbuf = malloc(MQTT_RECV_BUF_SIZE);
+  tsMqttIsRuning = true;
+
+  mqtt_init_reconnect(&tsMqttClient, mqttReconnectClient, &tsMqttStatus, mqttPublishCallback);
+  if (pthread_create(&tsMqttClientDaemonThread, NULL, mqttClientRefresher, &tsMqttClient)) {
+    mqttError("mqtt failed to start daemon.");
+    mqttCleanupRes(EXIT_FAILURE, -1, NULL);
+    return -1;
  }

-  mqtt_init_reconnect(&mqttClient, mqttReconnectClient, &recntStatus, mqtt_PublishCallback);
-  if (pthread_create(&clientDaemonThread, NULL, mqttClientRefresher, &mqttClient)) {
-    mqttError("Failed to start client daemon.");
-    mqttCleanup(EXIT_FAILURE, -1, NULL);
-    rc = -1;
-  } else {
-    mqttInfo("listening for '%s' messages.", recntStatus.topic);
-  }
-#endif
-  return rc;
+  mqttInfo("mqtt listening for topic:%s messages", tsMqttTopic);
+  return 0;
 }

 void mqttStopSystem() {
-#if 0  
-  mqttClient.error = MQTT_ERROR_SOCKET_ERROR;
-  mttIsRuning = 0;
-  usleep(300000U);
-  mqttCleanup(EXIT_SUCCESS, mqttClient.socketfd, &clientDaemonThread);
-  mqttInfo("mqtt is stoped");
-#endif  
+  if (tsMqttIsRuning) {
+    tsMqttIsRuning = false;
+    tsMqttClient.error = MQTT_ERROR_SOCKET_ERROR;
+
+    taosMsleep(300);
+    mqttCleanupRes(EXIT_SUCCESS, tsMqttClient.socketfd, &tsMqttClientDaemonThread);
+
+    mqttInfo("mqtt is stopped");
+  }
 }

 void mqttCleanUpSystem() {
-#if 0
-  mqttInfo("starting to cleanup mqtt");
-  free(recntStatus.user_name);
-  free(recntStatus.password);
-  free(recntStatus.hostname);
-  free(recntStatus.port);
-  free(recntStatus.topic);
-  free(topicPath);
+  mqttStopSystem();
  mqttInfo("mqtt is cleaned up");
-#endif  
 }

-void mqtt_PublishCallback(void** unused, struct mqtt_response_publish* published) {
-  /* note that published->topic_name is NOT null-terminated (here we'll change it to a c-string) */
-  char* topic_name = (char*)malloc(published->topic_name_size + 1);
-  memcpy(topic_name, published->topic_name, published->topic_name_size);
-  topic_name[published->topic_name_size] = '\0';
-  mqttInfo("received publish('%s'): %s", topic_name, (const char*)published->application_message);
-  char _token[128] = {0};
-  char _dbname[128] = {0};
-  char _tablename[128] = {0};
-  if (mqttConnect == NULL) {
-    mqttInfo("connect database");
-    taos_connect_a(NULL, "_root", tsInternalPass, "", 0, mqttInitConnCb, &mqttClient, &mqttConnect);
-  }
-  if (topic_name[1]=='/' &&  strncmp((char*)&topic_name[1], topicPath, strlen(topicPath)) == 0) {
-    char* p_p_cmd_part[5] = {0};
-    char  copystr[1024] = {0};
-    strncpy(copystr, topic_name, MIN(1024, published->topic_name_size));
-    char part_index = split(copystr, "/", p_p_cmd_part, 10);
-    if (part_index < 4) {
-      mqttError("The topic %s is't format '/path/token/dbname/table name/'. for expmle: '/taos/token/db/t'", topic_name);
-    } else {
-      strncpy(_token, p_p_cmd_part[1], 127);
-      strncpy(_dbname, p_p_cmd_part[2], 127);
-      strncpy(_tablename, p_p_cmd_part[3], 127);
-      mqttInfo("part count=%d,access token:%s,database name:%s, table name:%s", part_index, _token, _dbname,
-                _tablename);
+void mqttPublishCallback(void** unused, struct mqtt_response_publish* published) {
+  const char* content = published->application_message;
+  mqttDebug("receive mqtt message, size:%d", (int)published->application_message_size);

-      if (mqttConnect != NULL) {
-        char* _sql = converJsonToSql((char*)published->application_message, _dbname, _tablename);
-        mqttInfo("query:%s", _sql);
-        taos_query_a(mqttConnect, _sql, mqttQueryInsertCallback, &mqttClient);
-        mqttInfo("free sql:%s", _sql);
-        free(_sql);
+  if (tsMqttConnect == NULL) {
+    tsMqttConnect = taos_connect(NULL, "_root", tsInternalPass, "", 0);
+    if (tsMqttConnect == NULL) {
+      mqttError("failed to connect to tdengine, reason:%s", tstrerror(terrno));
+      return;
+    } else {
+      mqttInfo("successfully connected to the tdengine");
    }
  }
+
+  mqttTrace("receive mqtt message, content:%s", content);
+
+  char* sql = mqttConverJsonToSql((char*)content, (int)published->application_message_size);
+  if (sql != NULL) {
+    void* res = taos_query(tsMqttConnect, sql);
+    int   code = taos_errno(res);
+    if (code != 0) {
+      mqttError("failed to exec sql, reason:%s sql:%s", tstrerror(code), sql);
+    } else {
+      mqttTrace("successfully to exec sql:%s", sql);
+    }
+    taos_free_result(res);
+  } else {
+    mqttError("failed to parse mqtt message");
  }
-  free(topic_name);
 }

 void* mqttClientRefresher(void* client) {
-  while (mttIsRuning) {
+  while (tsMqttIsRuning) {
    mqtt_sync((struct mqtt_client*)client);
    taosMsleep(100);
  }
-  mqttDebug("quit refresher");
+
+  mqttDebug("mqtt quit refresher");
  return NULL;
 }

-void mqttCleanup(int status, int sockfd, pthread_t* client_daemon) {
-#if 0 
+void mqttCleanupRes(int status, int sockfd, pthread_t* client_daemon) {
  mqttInfo("clean up mqtt module");
-  if (sockfd != -1) close(sockfd);
-  if (client_daemon != NULL) pthread_cancel(*client_daemon);
-#endif
-}
-
-void mqttInitConnCb(void* param, TAOS_RES* result, int32_t code) {
-  if (code < 0) {
-    mqttError("mqtt:%d, connect to database failed, reason:%s", code, tstrerror(code));
-    taos_close(mqttConnect);
-    mqttConnect = NULL;
-    return;
+  if (sockfd != -1) {
+    close(sockfd);
  }
-  mqttDebug("mqtt:%d, connect to database success, reason:%s", code, tstrerror(code));
-}

-void mqttQueryInsertCallback(void* param, TAOS_RES* result, int32_t code) {
-  if (code < 0) {
-    mqttError("mqtt:%d, save data failed, code:%s", code, tstrerror(code));
-  } else if (code == 0) {
-    mqttError("mqtt:%d, save data failed, affect rows:%d", code, code);
-  } else {
-    mqttInfo("mqtt:%d, save data   success, code:%s", code, tstrerror(code));
+  if (client_daemon != NULL) {
+    pthread_cancel(*client_daemon);
  }
 }

-void mqttReconnectClient(struct mqtt_client* client, void** reconnect_state_vptr) {
-  mqttInfo("reconnect client");
-  struct reconnect_state_t* reconnect_state = *((struct reconnect_state_t**)reconnect_state_vptr);
+void mqttReconnectClient(struct mqtt_client* client, void** unused) {
+  mqttInfo("mqtt tries to connect to the mqtt server");

-  /* Close the clients socket if this isn't the initial reconnect call */
  if (client->error != MQTT_ERROR_INITIAL_RECONNECT) {
    close(client->socketfd);
  }

-  /* Perform error handling here. */
  if (client->error != MQTT_ERROR_INITIAL_RECONNECT) {
-    mqttError("mqttReconnectClient: called while client was in error state \"%s\"", mqtt_error_str(client->error));
+    mqttError("mqtt client was in error state %s", mqtt_error_str(client->error));
  }

-  /* Open a new socket. */
-  int sockfd = open_nb_socket(reconnect_state->hostname, reconnect_state->port);
-  if (sockfd == -1) {
-    mqttError("failed to open socket: ");
-    mqttCleanup(EXIT_FAILURE, sockfd, NULL);
+  int sockfd = open_nb_socket(tsMqttHostName, tsMqttPort);
+  if (sockfd < 0) {
+    mqttError("mqtt client failed to open socket %s:%s", tsMqttHostName, tsMqttPort);
+    //mqttCleanupRes(EXIT_FAILURE, sockfd, NULL);
+    return;
  }

-  /* Reinitialize the client. */
-  mqtt_reinit(client, sockfd, reconnect_state->sendbuf, reconnect_state->sendbufsz, reconnect_state->recvbuf,
-              reconnect_state->recvbufsz);
-
-  /* Ensure we have a clean session */
-  uint8_t connect_flags = MQTT_CONNECT_CLEAN_SESSION;
-  /* Send connection request to the broker. */
-  mqtt_connect(client, reconnect_state->client_id, NULL, NULL, 0, reconnect_state->user_name, reconnect_state->password,connect_flags, 400);
-
-  /* Subscribe to the topic. */
-  mqtt_subscribe(client, reconnect_state->topic, 0);
+  mqtt_reinit(client, sockfd, tsMqttStatus.sendbuf, tsMqttStatus.sendbufsz, tsMqttStatus.recvbuf, tsMqttStatus.recvbufsz);
+  mqtt_connect(client, tsMqttClientId, NULL, NULL, 0, tsMqttUser, tsMqttPass, MQTT_CONNECT_CLEAN_SESSION, 400);
+  mqtt_subscribe(client, tsMqttTopic, 0);
 }
--- a/src/query/CMakeLists.txt
+++ b/src/query/CMakeLists.txt
@ -8,10 +8,9 @@ INCLUDE_DIRECTORIES(inc)
 AUX_SOURCE_DIRECTORY(src SRC)
 ADD_LIBRARY(query ${SRC})
 SET_SOURCE_FILES_PROPERTIES(src/sql.c PROPERTIES COMPILE_FLAGS -w)
+TARGET_LINK_LIBRARIES(query tsdb tutil)

 IF (TD_LINUX)
-  TARGET_LINK_LIBRARIES(query tsdb tutil m rt)
+  TARGET_LINK_LIBRARIES(query m rt)
  ADD_SUBDIRECTORY(tests)
-ELSEIF (TD_WINDOWS)
-   TARGET_LINK_LIBRARIES(query tsdb tutil)
 ENDIF ()
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@ -718,12 +718,12 @@ static SRpcConn *rpcAllocateServerConn(SRpcInfo *pRpc, SRecvInfo *pRecv) {
  if (pConn) {
    if (pRecv->connType == RPC_CONN_UDPS && pRpc->numOfThreads > 1) {
      // UDP server, assign to new connection
-      pRpc->index = (pRpc->index+1) % pRpc->numOfThreads;
+      pRpc->index = (pRpc->index + 1) % pRpc->numOfThreads;
      pConn->localPort = (pRpc->localPort + pRpc->index);
    }

    taosHashPut(pRpc->hash, hashstr, size, (char *)&pConn, POINTER_BYTES);
-    tDebug("%s %p server connection is allocated, uid:0x%x", pRpc->label, pConn, pConn->linkUid);
+    tDebug("%s %p server connection is allocated, uid:0x%x sid:%d key:%s", pRpc->label, pConn, pConn->linkUid, sid, hashstr);
  }

  return pConn;
--- a/src/sync/src/syncMain.c
+++ b/src/sync/src/syncMain.c
@ -797,9 +797,11 @@ static void syncRecoverFromMaster(SSyncPeer *pPeer) {
  }

  taosTmrStopA(&pPeer->timer);
-  if (tsSyncNum >= tsMaxSyncNum) {
+
+  // Ensure the sync of mnode not interrupted
+  if (pNode->vgId != 1 && tsSyncNum >= tsMaxSyncNum) {
    sInfo("%s, %d syncs are in process, try later", pPeer->id, tsSyncNum);
-    taosTmrReset(syncTryRecoverFromMaster, 500 + (pNode->vgId*10)%200, pPeer, syncTmrCtrl, &pPeer->timer);
+    taosTmrReset(syncTryRecoverFromMaster, 500 + (pNode->vgId * 10) % 200, pPeer, syncTmrCtrl, &pPeer->timer);
    return;
  }

--- a/src/tsdb/CMakeLists.txt
+++ b/src/tsdb/CMakeLists.txt
@ -3,13 +3,10 @@ PROJECT(TDengine)

 INCLUDE_DIRECTORIES(inc)
 AUX_SOURCE_DIRECTORY(src SRC)
+ADD_LIBRARY(tsdb ${SRC})
+TARGET_LINK_LIBRARIES(tsdb common tutil)

 IF (TD_LINUX)
-  ADD_LIBRARY(tsdb ${SRC})
-  TARGET_LINK_LIBRARIES(tsdb common tutil)
  # Someone has no gtest directory, so comment it
  # ADD_SUBDIRECTORY(tests)
-ELSEIF (TD_WINDOWS)
-  ADD_LIBRARY(tsdb ${SRC})
-  TARGET_LINK_LIBRARIES(tsdb common tutil)
 ENDIF ()
--- a/src/tsdb/src/tsdbFile.c
+++ b/src/tsdb/src/tsdbFile.c
@ -31,6 +31,8 @@ static void tsdbDestroyFile(SFile *pFile);
 static int   compFGroup(const void *arg1, const void *arg2);
 static int   keyFGroupCompFunc(const void *key, const void *fgroup);
 static void  tsdbInitFileGroup(SFileGroup *pFGroup, STsdbRepo *pRepo);
+static TSKEY tsdbGetCurrMinKey(int8_t precision, int32_t keep);
+static int   tsdbGetCurrMinFid(int8_t precision, int32_t keep, int32_t days);

 // ---------------- INTERNAL FUNCTIONS ----------------
 STsdbFileH *tsdbNewFileH(STsdbCfg *pCfg) {
@ -79,9 +81,11 @@ int tsdbOpenFileH(STsdbRepo *pRepo) {
  int     vid = 0;
  regex_t regex1, regex2;
  int     code = 0;
+  char    fname[TSDB_FILENAME_LEN] = "\0";

  SFileGroup  fileGroup = {0};
  STsdbFileH *pFileH = pRepo->tsdbFileH;
+  STsdbCfg *  pCfg = &(pRepo->config);

  tDataDir = tsdbGetDataDirName(pRepo->rootDir);
  if (tDataDir == NULL) {
@ -108,6 +112,8 @@ int tsdbOpenFileH(STsdbRepo *pRepo) {
    goto _err;
  }

+  int mfid = tsdbGetCurrMinFid(pCfg->precision, pCfg->keep, pCfg->daysPerFile);
+
  struct dirent *dp = NULL;
  while ((dp = readdir(dir)) != NULL) {
    if (strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) continue;
@ -120,6 +126,14 @@ int tsdbOpenFileH(STsdbRepo *pRepo) {
        continue;
      }

+      if (fid < mfid) {
+        for (int type = 0; type < TSDB_FILE_TYPE_MAX; type++) {
+          tsdbGetDataFileName(pRepo->rootDir, pCfg->tsdbId, fid, type, fname);
+          (void)remove(fname);
+        }
+        continue;
+      }
+
      if (tsdbSearchFGroup(pFileH, fid, TD_EQ) != NULL) continue;
      memset((void *)(&fileGroup), 0, sizeof(SFileGroup));
      fileGroup.fileId = fid;
@ -128,12 +142,30 @@ int tsdbOpenFileH(STsdbRepo *pRepo) {
    } else if (code == REG_NOMATCH) {
      code = regexec(&regex2, dp->d_name, 0, NULL, 0);
      if (code == 0) {
-        tsdbDebug("vgId:%d invalid file %s exists, remove it", REPO_ID(pRepo), dp->d_name);
-        char *fname = malloc(strlen(tDataDir) + strlen(dp->d_name) + 2);
-        if (fname == NULL) goto _err;
-        sprintf(fname, "%s/%s", tDataDir, dp->d_name);
-        (void)remove(fname);
-        free(fname);
+        size_t tsize = strlen(tDataDir) + strlen(dp->d_name) + 2;
+        char * fname1 = malloc(tsize);
+        if (fname1 == NULL) {
+          terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
+          goto _err;
+        }
+        sprintf(fname1, "%s/%s", tDataDir, dp->d_name);
+
+        tsize = tsize + 64;
+        char *fname2 = malloc(tsize);
+        if (fname2 == NULL) {
+          free(fname1);
+          terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
+          goto _err;
+        }
+        sprintf(fname2, "%s/%s_back_%" PRId64, tDataDir, dp->d_name, taosGetTimestamp(TSDB_TIME_PRECISION_MILLI));
+
+        (void)rename(fname1, fname2);
+
+        tsdbDebug("vgId:%d file %s exists, backup it as %s", REPO_ID(pRepo), fname1, fname2);
+
+        free(fname1);
+        free(fname2);
+        continue;
      } else if (code == REG_NOMATCH) {
        tsdbError("vgId:%d invalid file %s exists, ignore it", REPO_ID(pRepo), dp->d_name);
        continue;
@ -146,6 +178,7 @@ int tsdbOpenFileH(STsdbRepo *pRepo) {

    pFileH->pFGroup[pFileH->nFGroups++] = fileGroup;
    qsort((void *)(pFileH->pFGroup), pFileH->nFGroups, sizeof(SFileGroup), compFGroup);
+    tsdbDebug("vgId:%d file group %d is restored, nFGroups %d", REPO_ID(pRepo), fileGroup.fileId, pFileH->nFGroups);
  }

  regfree(&regex1);
@ -179,8 +212,18 @@ void tsdbCloseFileH(STsdbRepo *pRepo) {

 SFileGroup *tsdbCreateFGroupIfNeed(STsdbRepo *pRepo, char *dataDir, int fid) {
  STsdbFileH *pFileH = pRepo->tsdbFileH;
+  STsdbCfg *  pCfg = &(pRepo->config);

-  if (pFileH->nFGroups >= pFileH->maxFGroups) return NULL;
+  if (pFileH->nFGroups >= pFileH->maxFGroups) {
+    int mfid = tsdbGetCurrMinFid(pCfg->precision, pCfg->keep, pCfg->daysPerFile);
+    if (pFileH->pFGroup[0].fileId < mfid) {
+      pthread_rwlock_wrlock(&pFileH->fhlock);
+      tsdbRemoveFileGroup(pRepo, &(pFileH->pFGroup[0]));
+      pthread_rwlock_unlock(&pFileH->fhlock);
+    }
+  }
+
+  ASSERT(pFileH->nFGroups < pFileH->maxFGroups);

  SFileGroup  fGroup;
  SFileGroup *pFGroup = &fGroup;
@ -342,8 +385,7 @@ void tsdbFitRetention(STsdbRepo *pRepo) {
  STsdbFileH *pFileH = pRepo->tsdbFileH;
  SFileGroup *pGroup = pFileH->pFGroup;

-  int mfid = (int)(TSDB_KEY_FILEID(taosGetTimestamp(pCfg->precision), pCfg->daysPerFile, pCfg->precision) -
-             TSDB_MAX_FILE(pCfg->keep, pCfg->daysPerFile));
+  int mfid = tsdbGetCurrMinFid(pCfg->precision, pCfg->keep, pCfg->daysPerFile);

  pthread_rwlock_wrlock(&(pFileH->fhlock));

@ -547,3 +589,11 @@ static void tsdbInitFileGroup(SFileGroup *pFGroup, STsdbRepo *pRepo) {
    }
  }
 }
+
+static TSKEY tsdbGetCurrMinKey(int8_t precision, int32_t keep) {
+  return (TSKEY)(taosGetTimestamp(precision) - keep * tsMsPerDay[precision]);
+}
+
+static int tsdbGetCurrMinFid(int8_t precision, int32_t keep, int32_t days) {
+  return (int)(TSDB_KEY_FILEID(tsdbGetCurrMinKey(precision, keep), days, precision));
+}
--- a/src/tsdb/src/tsdbRWHelper.c
+++ b/src/tsdb/src/tsdbRWHelper.c
@ -767,7 +767,7 @@ static int tsdbWriteBlockToFile(SRWHelper *pHelper, SFile *pFile, SDataCols *pDa
  int32_t lsize = tsize;
  int32_t keyLen = 0;
  for (int ncol = 0; ncol < pDataCols->numOfCols; ncol++) {
-    if (tcol >= nColsNotAllNull) break;
+    if (ncol != 0 && tcol >= nColsNotAllNull) break;

    SDataCol *pDataCol = pDataCols->cols + ncol;
    SCompCol *pCompCol = pCompData->cols + tcol;
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@ -1186,7 +1186,7 @@ static void copyAllRemainRowsFromFileBlock(STsdbQueryHandle* pQueryHandle, STabl

  // the time window should always be ascending order: skey <= ekey
  cur->win = (STimeWindow) {.skey = tsArray[start], .ekey = tsArray[end]};
-  cur->mixBlock = (start > 0 && end < pBlockInfo->rows - 1);
+  cur->mixBlock = (numOfRows != pBlockInfo->rows);
  cur->lastKey = tsArray[endPos] + step;
  cur->blockCompleted = true;

@ -1731,12 +1731,13 @@ static void changeQueryHandleForInterpQuery(TsdbQueryHandleT pHandle) {
  assert(pQueryHandle->window.skey == pQueryHandle->window.ekey);

  // starts from the buffer in case of descending timestamp order check data blocks
-  // todo consider the query time window, current last_row does not apply the query time window
  size_t numOfTables = taosArrayGetSize(pQueryHandle->pTableCheckInfo);

  int32_t i = 0;
  while(i < numOfTables) {
    STableCheckInfo* pCheckInfo = taosArrayGet(pQueryHandle->pTableCheckInfo, i);
+
+    // the first qualified table for interpolation query
    if (pQueryHandle->window.skey <= pCheckInfo->pTableObj->lastKey &&
        pCheckInfo->pTableObj->lastKey != TSKEY_INITIAL_VAL) {
      break;
--- a/src/util/CMakeLists.txt
+++ b/src/util/CMakeLists.txt
@ -3,9 +3,10 @@ PROJECT(TDengine)

 AUX_SOURCE_DIRECTORY(src SRC)
 ADD_LIBRARY(tutil ${SRC})
+TARGET_LINK_LIBRARIES(tutil pthread osdetail lz4)
  
 IF (TD_LINUX)
-  TARGET_LINK_LIBRARIES(tutil pthread osdetail m rt lz4)
+  TARGET_LINK_LIBRARIES(tutil m rt)
  ADD_SUBDIRECTORY(tests)

  FIND_PATH(ICONV_INCLUDE_EXIST iconv.h /usr/include/ /usr/local/include/)
@ -24,7 +25,7 @@ IF (TD_LINUX)
  ENDIF ()

 ELSEIF (TD_WINDOWS)
-  TARGET_LINK_LIBRARIES(tutil iconv regex pthread osdetail winmm IPHLPAPI ws2_32 lz4 wepoll)
+  TARGET_LINK_LIBRARIES(tutil iconv regex winmm IPHLPAPI ws2_32 wepoll)
 ELSEIF(TD_DARWIN)
-  TARGET_LINK_LIBRARIES(tutil iconv pthread osdetail lz4)
+  TARGET_LINK_LIBRARIES(tutil iconv)
 ENDIF()
--- a/src/util/src/tconfig.c
+++ b/src/util/src/tconfig.c
@ -270,7 +270,7 @@ void taosReadGlobalLogCfg() {
  }
  wordfree(&full_path);

-  taosReadLogOption("tsLogDir", tsLogDir);
+  taosReadLogOption("logDir", tsLogDir);
  
  sprintf(fileName, "%s/taos.cfg", configDir);
  fp = fopen(fileName, "r");
--- a/src/util/src/tlog.c
+++ b/src/util/src/tlog.c
@ -62,6 +62,7 @@ typedef struct {
  pthread_mutex_t logMutex;
 } SLogObj;

+int32_t tsLogKeepDays = 0;
 int32_t tsAsyncLog = 1;
 float   tsTotalLogDirGB = 0;
 float   tsAvailLogDirGB = 0;
@ -78,6 +79,7 @@ static int32_t   taosPushLogBuffer(SLogBuff *tLogBuff, char *msg, int32_t msgLen
 static SLogBuff *taosLogBuffNew(int32_t bufSize);
 static void      taosCloseLogByFd(int32_t oldFd);
 static int32_t   taosOpenLogFile(char *fn, int32_t maxLines, int32_t maxFileNum);
+extern void      taosPrintGlobalCfg();

 static int32_t taosStartLog() {
  pthread_attr_t threadAttr;
@ -136,11 +138,24 @@ static void taosUnLockFile(int32_t fd) {
  }
 }

+static void taosKeepOldLog(char *oldName) {
+  if (tsLogKeepDays <= 0) return;
+
+  int64_t fileSec = taosGetTimestampSec();
+  char    fileName[LOG_FILE_NAME_LEN + 20];
+  snprintf(fileName, LOG_FILE_NAME_LEN + 20, "%s.%" PRId64, tsLogObj.logName, fileSec);
+
+  taosRename(oldName, fileName);
+  taosRemoveOldLogFiles(tsLogDir, tsLogKeepDays);
+}
+
 static void *taosThreadToOpenNewFile(void *param) {
-  char name[LOG_FILE_NAME_LEN + 20];
+  char keepName[LOG_FILE_NAME_LEN + 20];
+  sprintf(keepName, "%s.%d", tsLogObj.logName, tsLogObj.flag);

  tsLogObj.flag ^= 1;
  tsLogObj.lines = 0;
+  char name[LOG_FILE_NAME_LEN + 20];
  sprintf(name, "%s.%d", tsLogObj.logName, tsLogObj.flag);

  umask(0);
@ -150,6 +165,7 @@ static void *taosThreadToOpenNewFile(void *param) {
    uError("open new log file fail! fd:%d reason:%s", fd, strerror(errno));
    return NULL;
  }
+
  taosLockFile(fd);
  (void)lseek(fd, 0, SEEK_SET);

@ -157,9 +173,13 @@ static void *taosThreadToOpenNewFile(void *param) {
  tsLogObj.logHandle->fd = fd;
  tsLogObj.lines = 0;
  tsLogObj.openInProgress = 0;
-  uInfo("new log file is opened!!!");
-
  taosCloseLogByFd(oldFd);
+  
+  uInfo("   new log file:%d is opened", tsLogObj.flag);
+  uInfo("==================================");
+  taosPrintGlobalCfg();
+  taosKeepOldLog(keepName);
+
  return NULL;
 }

@ -264,21 +284,24 @@ static int32_t taosOpenLogFile(char *fn, int32_t maxLines, int32_t maxFileNum) {
    strcat(name, ".0");
  }

-  // if none of the log files exist, open 0, if both exists, open the old one
-  if (stat(name, &logstat0) < 0) {
-    tsLogObj.flag = 0;
-  } else {
  if (strlen(fn) < LOG_FILE_NAME_LEN + 50 - 2) {
    strcpy(name, fn);
    strcat(name, ".1");
  }

-    if (stat(name, &logstat1) < 0) {
+  bool log0Exist = stat(name, &logstat0) >= 0;
+  bool log1Exist = stat(name, &logstat1) >= 0;
+  
+  // if none of the log files exist, open 0, if both exists, open the old one
+  if (!log0Exist && !log1Exist) {
+    tsLogObj.flag = 0;
+  } else if (!log1Exist) {
+    tsLogObj.flag = 0;
+  } else if (!log0Exist) {
    tsLogObj.flag = 1;
  } else {
    tsLogObj.flag = (logstat0.st_mtime > logstat1.st_mtime) ? 0 : 1;
  }
-  }

  char fileName[LOG_FILE_NAME_LEN + 50] = "\0";
  sprintf(fileName, "%s.%d", tsLogObj.logName, tsLogObj.flag);
--- a/src/util/src/tnettest.c
+++ b/src/util/src/tnettest.c
@ -73,7 +73,7 @@ static void *bindUdpPort(void *sarg) {
      continue;
    }
    if (iDataNum > 0) {
-      printf("recv Client: %s pkg from UDP port: %d, pkg len: %d\n", inet_ntoa(clientAddr.sin_addr), port, iDataNum);
+      printf("recv Client: %s pkg from UDP port: %d, pkg len: %d\n", taosInetNtoa(clientAddr.sin_addr), port, iDataNum);
      //printf("Read msg from udp:%s ... %s\n", buffer, buffer+iDataNum-16);

      sendto(serverSocket, buffer, iDataNum, 0, (struct sockaddr *)&clientAddr, (int)sin_size);
@ -138,7 +138,7 @@ static void *bindTcpPort(void *sarg) {
        if (errno == EINTR) {
          continue;
        } else {
-          printf("recv Client: %s pkg from TCP port: %d fail:%s.\n", inet_ntoa(clientAddr.sin_addr), port, strerror(errno));
+          printf("recv Client: %s pkg from TCP port: %d fail:%s.\n", taosInetNtoa(clientAddr.sin_addr), port, strerror(errno));
          taosCloseSocket(serverSocket);
          return NULL;
        }
@ -149,7 +149,7 @@ static void *bindTcpPort(void *sarg) {
      }      
    }
    
-    printf("recv Client: %s pkg from TCP port: %d, pkg len: %d\n", inet_ntoa(clientAddr.sin_addr), port, iDataNum);
+    printf("recv Client: %s pkg from TCP port: %d, pkg len: %d\n", taosInetNtoa(clientAddr.sin_addr), port, iDataNum);
    if (iDataNum > 0) {
      send(client, buffer, iDataNum, 0);
    }
@ -197,7 +197,7 @@ static int checkTcpPort(info_s *info) {

  struct in_addr ipStr;
  memcpy(&ipStr, &info->hostIp, 4);
-  sprintf(sendbuf, "client send tcp pkg to %s:%d, content: 1122334455", inet_ntoa(ipStr), info->port);
+  sprintf(sendbuf, "client send tcp pkg to %s:%d, content: 1122334455", taosInetNtoa(ipStr), info->port);
  sprintf(sendbuf + info->pktLen - 16, "1122334455667788");

  send(clientSocket, sendbuf, info->pktLen, 0);
@ -267,7 +267,7 @@ static int checkUdpPort(info_s *info) {

  struct in_addr ipStr;
  memcpy(&ipStr, &info->hostIp, 4);
-  sprintf(sendbuf, "client send udp pkg to %s:%d, content: 1122334455", inet_ntoa(ipStr), info->port);
+  sprintf(sendbuf, "client send udp pkg to %s:%d, content: 1122334455", taosInetNtoa(ipStr), info->port);
  sprintf(sendbuf + info->pktLen - 16, "1122334455667788");

  socklen_t sin_size = sizeof(*(struct sockaddr *)&serverAddr);
--- a/src/vnode/src/vnodeMain.c
+++ b/src/vnode/src/vnodeMain.c
@ -47,6 +47,15 @@ static void     vnodeNotifyRole(void *ahandle, int8_t role);
 static void     vnodeCtrlFlow(void *handle, int32_t mseconds); 
 static int      vnodeNotifyFileSynced(void *ahandle, uint64_t fversion);

+#ifndef _SYNC
+tsync_h syncStart(const SSyncInfo *info) { return NULL; }
+int32_t syncForwardToPeer(tsync_h shandle, void *pHead, void *mhandle, int qtype) { return 0; }
+void    syncStop(tsync_h shandle) {}
+int32_t syncReconfig(tsync_h shandle, const SSyncCfg * cfg) { return 0; }
+int     syncGetNodesRole(tsync_h shandle, SNodesRole * cfg) { return 0; }
+void    syncConfirmForward(tsync_h shandle, uint64_t version, int32_t code) {}
+#endif
+
 int32_t vnodeInitResources() {
  vnodeInitWriteFp();
  vnodeInitReadFp();
@ -289,12 +298,16 @@ int32_t vnodeOpen(int32_t vnode, char *rootDir) {
  syncInfo.notifyFileSynced = vnodeNotifyFileSynced;
  pVnode->sync = syncStart(&syncInfo);

+#ifndef _SYNC
+  pVnode->role = TAOS_SYNC_ROLE_MASTER;
+#else
  if (pVnode->sync == NULL) {
    vError("vgId:%d, failed to open sync module, replica:%d reason:%s", pVnode->vgId, pVnode->syncCfg.replica,
           tstrerror(terrno));
    vnodeCleanUp(pVnode);
    return terrno;
  }
+#endif  

  pVnode->qMgmt = qOpenQueryMgmt(pVnode->vgId);
  if (pVnode->qMgmt == NULL) {
@ -369,7 +382,13 @@ void vnodeRelease(void *pVnodeRaw) {
    char newDir[TSDB_FILENAME_LEN] = {0};
    sprintf(rootDir, "%s/vnode%d", tsVnodeDir, vgId);
    sprintf(newDir, "%s/vnode%d", tsVnodeBakDir, vgId);
+
+    if (0 == tsEnableVnodeBak) {
+      vInfo("vgId:%d, vnode backup not enabled", pVnode->vgId);
+    } else {
      taosRename(rootDir, newDir);
+    }
+
    taosRemoveDir(rootDir);
    dnodeSendStatusMsgToMnode();
  }
@ -658,9 +677,13 @@ static int32_t vnodeSaveCfg(SMDCreateVnodeMsg *pVnodeCfg) {
  len += snprintf(content + len, maxLen - len, "  \"quorum\": %d,\n", pVnodeCfg->cfg.quorum);

  len += snprintf(content + len, maxLen - len, "  \"nodeInfos\": [{\n");
+
+  vInfo("vgId:%d, save vnode cfg, replica:%d", pVnodeCfg->cfg.vgId, pVnodeCfg->cfg.replications);
  for (int32_t i = 0; i < pVnodeCfg->cfg.replications; i++) {
    len += snprintf(content + len, maxLen - len, "    \"nodeId\": %d,\n", pVnodeCfg->nodes[i].nodeId);
    len += snprintf(content + len, maxLen - len, "    \"nodeEp\": \"%s\"\n", pVnodeCfg->nodes[i].nodeEp);
+    vInfo("vgId:%d, save vnode cfg, nodeId:%d nodeEp:%s", pVnodeCfg->cfg.vgId, pVnodeCfg->nodes[i].nodeId,
+          pVnodeCfg->nodes[i].nodeEp);

    if (i < pVnodeCfg->cfg.replications - 1) {
      len += snprintf(content + len, maxLen - len, "  },{\n");
--- a/src/wal/CMakeLists.txt
+++ b/src/wal/CMakeLists.txt
@ -7,6 +7,5 @@ AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR}/src SRC)
 IF (TD_LINUX)
  ADD_LIBRARY(twal ${SRC})
  TARGET_LINK_LIBRARIES(twal tutil common)
-
  ADD_SUBDIRECTORY(test)
 ENDIF ()  
--- a/tests/examples/JDBC/JDBCDemo/pom.xml
+++ b/tests/examples/JDBC/JDBCDemo/pom.xml
@ -63,7 +63,7 @@
        <dependency>
            <groupId>com.taosdata.jdbc</groupId>
            <artifactId>taos-jdbcdriver</artifactId>
-            <version>2.0.2</version>
+            <version>2.0.4</version>
        </dependency>
    </dependencies>
 </project>
--- a/tests/examples/JDBC/springbootdemo/pom.xml
+++ b/tests/examples/JDBC/springbootdemo/pom.xml
@ -63,7 +63,7 @@
        <dependency>
            <groupId>com.taosdata.jdbc</groupId>
            <artifactId>taos-jdbcdriver</artifactId>
-            <version>2.0.2</version>
+            <version>2.0.4</version>
        </dependency>

        <dependency>
@ -76,6 +76,24 @@
    </dependencies>

    <build>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <includes>
+                    <include>**/*.properties</include>
+                    <include>**/*.xml</include>
+                </includes>
+                <filtering>true</filtering>
+            </resource>
+            <resource>
+                <directory>src/main/java</directory>
+                <includes>
+                    <include>**/*.properties</include>
+                    <include>**/*.xml</include>
+                </includes>
+            </resource>
+
+        </resources>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/controller/RainStationController.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/controller/RainStationController.java
@ -0,0 +1,28 @@
+package com.taosdata.jdbc.springbootdemo.controller;
+
+
+import com.taosdata.jdbc.springbootdemo.domain.Rainfall;
+import com.taosdata.jdbc.springbootdemo.service.RainStationService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/rainstation")
+public class RainStationController {
+
+    @Autowired
+    private RainStationService service;
+
+    @GetMapping("/init")
+    public boolean init() {
+        service.init();
+        service.createTable();
+        return true;
+    }
+
+    @PostMapping("/insert")
+    public int insert(@RequestBody Rainfall rainfall){
+        return service.insert(rainfall);
+    }
+
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/controller/WeatherController.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/controller/WeatherController.java
@ -16,43 +16,47 @@ public class WeatherController {

    /**
     * create database and table
+     *
     * @return
     */
    @GetMapping("/init")
-    public boolean init(){
+    public boolean init() {
        return weatherService.init();
    }

    /**
     * Pagination Query
+     *
     * @param limit
     * @param offset
     * @return
     */
    @GetMapping("/{limit}/{offset}")
-    public List<Weather> queryWeather(@PathVariable Long limit, @PathVariable Long offset){
+    public List<Weather> queryWeather(@PathVariable Long limit, @PathVariable Long offset) {
        return weatherService.query(limit, offset);
    }

    /**
     * upload single weather info
+     *
     * @param temperature
     * @param humidity
     * @return
     */
    @PostMapping("/{temperature}/{humidity}")
-    public int saveWeather(@PathVariable int temperature, @PathVariable float humidity){
+    public int saveWeather(@PathVariable int temperature, @PathVariable float humidity) {

        return weatherService.save(temperature, humidity);
    }

    /**
     * upload multi weather info
+     *
     * @param weatherList
     * @return
     */
    @PostMapping("/batch")
-    public int batchSaveWeather(@RequestBody List<Weather> weatherList){
+    public int batchSaveWeather(@RequestBody List<Weather> weatherList) {

        return weatherService.save(weatherList);
    }
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/DatabaseMapper.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/DatabaseMapper.java
@ -0,0 +1,15 @@
+package com.taosdata.jdbc.springbootdemo.dao;
+
+import java.util.Map;
+
+public interface DatabaseMapper {
+
+    int createDatabase(String dbname);
+
+    int dropDatabase(String dbname);
+
+    int creatDatabaseWithParameters(Map<String,String> map);
+
+    int useDatabase(String dbname);
+
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/DatabaseMapper.xml
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/DatabaseMapper.xml
@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.taosdata.jdbc.springbootdemo.dao.DatabaseMapper">
+
+    <update id="createDatabase" parameterType="java.lang.String">
+        create database if not exists ${dbname}
+    </update>
+
+    <update id="dropDatabase" parameterType="java.lang.String">
+        DROP database if exists ${dbname}
+    </update>
+    
+    
+    <update id="creatDatabaseWithParameters" parameterType="map">
+        CREATE database if not EXISTS ${dbname}
+        <if test="keep != null">
+            KEEP ${keep}
+        </if>
+        <if test="days != null">
+            DAYS ${days}
+        </if>
+        <if test="replica != null">
+            REPLICA ${replica}
+        </if>
+        <if test="cache != null">
+            cache ${cache}
+        </if>
+        <if test="blocks != null">
+            blocks ${blocks}
+        </if>
+        <if test="minrows != null">
+            minrows ${minrows}
+        </if>
+        <if test="maxrows != null">
+            maxrows ${maxrows}
+        </if>
+    </update>
+
+    <update id="useDatabase" parameterType="java.lang.String">
+        use ${dbname}
+    </update>
+
+</mapper>
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/RainfallMapper.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/RainfallMapper.java
@ -0,0 +1,9 @@
+package com.taosdata.jdbc.springbootdemo.dao;
+
+import java.util.Map;
+
+public interface RainfallMapper {
+
+
+    int save(Map<String, Object> map);
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/RainfallMapper.xml
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/RainfallMapper.xml
@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.taosdata.jdbc.springbootdemo.dao.RainfallMapper">
+
+    <insert id="save" parameterType="map">
+        INSERT INTO ${table} using ${dbname}.${stable} tags(#{values.station_code}, #{values.station_name}) (ts, name, code, rainfall) values (#{values.ts}, #{values.name}, #{values.code}, #{values.rainfall})
+    </insert>
+
+
+</mapper>
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/TableMapper.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/TableMapper.java
@ -0,0 +1,8 @@
+package com.taosdata.jdbc.springbootdemo.dao;
+
+import com.taosdata.jdbc.springbootdemo.domain.TableMetadata;
+
+public interface TableMapper {
+
+    boolean createSTable(TableMetadata tableMetadata);
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/TableMapper.xml
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/TableMapper.xml
@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.taosdata.jdbc.springbootdemo.dao.TableMapper">
+
+    <update id="createSTable" parameterType="com.taosdata.jdbc.springbootdemo.domain.TableMetadata">
+        create table if not exists ${dbname}.${tablename}
+        <foreach collection="fields" item="field" index="index" open="(" close=")" separator=",">
+            ${field.name} ${field.type}
+        </foreach>
+        TAGS
+        <foreach collection="tags" item="tag" index="index" open="(" close=")" separator=",">
+            ${tag.name} ${tag.type}
+        </foreach>
+    </update>
+
+    <update id="dropTable" parameterType="java.lang.String">
+        drop ${tablename}
+    </update>
+
+</mapper>
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/WeatherMapper.xml
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/dao/WeatherMapper.xml
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/FieldMetadata.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/FieldMetadata.java
@ -0,0 +1,28 @@
+package com.taosdata.jdbc.springbootdemo.domain;
+
+public class FieldMetadata {
+
+    private String name;
+    private String type;
+
+    public FieldMetadata(String name, String type) {
+        this.name = name;
+        this.type = type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/Rainfall.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/Rainfall.java
@ -0,0 +1,64 @@
+package com.taosdata.jdbc.springbootdemo.domain;
+
+import com.fasterxml.jackson.annotation.JsonFormat;
+
+import java.sql.Timestamp;
+
+public class Rainfall {
+
+    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss.SSS",timezone = "GMT+8")
+    private Timestamp ts;
+    private String name;
+    private String code;
+    private float rainfall;
+    private String station_code;
+    private String station_name;
+
+    public Timestamp getTs() {
+        return ts;
+    }
+
+    public void setTs(Timestamp ts) {
+        this.ts = ts;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public void setCode(String code) {
+        this.code = code;
+    }
+
+    public float getRainfall() {
+        return rainfall;
+    }
+
+    public void setRainfall(float rainfall) {
+        this.rainfall = rainfall;
+    }
+
+    public String getStation_code() {
+        return station_code;
+    }
+
+    public void setStation_code(String station_code) {
+        this.station_code = station_code;
+    }
+
+    public String getStation_name() {
+        return station_name;
+    }
+
+    public void setStation_name(String station_name) {
+        this.station_name = station_name;
+    }
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/TableMetadata.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/TableMetadata.java
@ -0,0 +1,43 @@
+package com.taosdata.jdbc.springbootdemo.domain;
+
+import java.util.List;
+
+public class TableMetadata {
+
+    private String dbname;
+    private String tablename;
+    private List<FieldMetadata> fields;
+    private List<TagMetadata> tags;
+
+    public String getDbname() {
+        return dbname;
+    }
+
+    public void setDbname(String dbname) {
+        this.dbname = dbname;
+    }
+
+    public String getTablename() {
+        return tablename;
+    }
+
+    public void setTablename(String tablename) {
+        this.tablename = tablename;
+    }
+
+    public List<FieldMetadata> getFields() {
+        return fields;
+    }
+
+    public void setFields(List<FieldMetadata> fields) {
+        this.fields = fields;
+    }
+
+    public List<TagMetadata> getTags() {
+        return tags;
+    }
+
+    public void setTags(List<TagMetadata> tags) {
+        this.tags = tags;
+    }
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/TagMetadata.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/TagMetadata.java
@ -0,0 +1,27 @@
+package com.taosdata.jdbc.springbootdemo.domain;
+
+public class TagMetadata {
+    private String name;
+    private String type;
+
+    public TagMetadata(String name, String type) {
+        this.name = name;
+        this.type = type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/Weather.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/domain/Weather.java
@ -1,9 +1,12 @@
 package com.taosdata.jdbc.springbootdemo.domain;

+import com.fasterxml.jackson.annotation.JsonFormat;
+
 import java.sql.Timestamp;

 public class Weather {

+    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss.SSS",timezone = "GMT+8")
    private Timestamp ts;

    private int temperature;
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/service/RainStationService.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/service/RainStationService.java
@ -0,0 +1,72 @@
+package com.taosdata.jdbc.springbootdemo.service;
+
+import com.taosdata.jdbc.springbootdemo.dao.DatabaseMapper;
+import com.taosdata.jdbc.springbootdemo.dao.RainfallMapper;
+import com.taosdata.jdbc.springbootdemo.dao.TableMapper;
+import com.taosdata.jdbc.springbootdemo.domain.FieldMetadata;
+import com.taosdata.jdbc.springbootdemo.domain.Rainfall;
+import com.taosdata.jdbc.springbootdemo.domain.TableMetadata;
+import com.taosdata.jdbc.springbootdemo.domain.TagMetadata;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Service
+public class RainStationService {
+
+    @Autowired
+    private DatabaseMapper databaseMapper;
+    @Autowired
+    private TableMapper tableMapper;
+    @Autowired
+    private RainfallMapper rainfallMapper;
+
+    public boolean init() {
+        databaseMapper.dropDatabase("rainstation");
+
+        Map<String, String> map = new HashMap<>();
+        map.put("dbname", "rainstation");
+        map.put("keep", "36500");
+        map.put("days", "30");
+        map.put("blocks", "4");
+        databaseMapper.creatDatabaseWithParameters(map);
+
+        databaseMapper.useDatabase("rainstation");
+        return true;
+    }
+
+    public boolean createTable() {
+        TableMetadata tableMetadata = new TableMetadata();
+        tableMetadata.setDbname("rainstation");
+        tableMetadata.setTablename("monitoring");
+
+        List<FieldMetadata> fields = new ArrayList<>();
+        fields.add(new FieldMetadata("ts", "timestamp"));
+        fields.add(new FieldMetadata("name", "NCHAR(10)"));
+        fields.add(new FieldMetadata("code", " BINARY(8)"));
+        fields.add(new FieldMetadata("rainfall", "float"));
+        tableMetadata.setFields(fields);
+
+        List<TagMetadata> tags = new ArrayList<>();
+        tags.add(new TagMetadata("station_code", "BINARY(8)"));
+        tags.add(new TagMetadata("station_name", "NCHAR(10)"));
+        tableMetadata.setTags(tags);
+
+        tableMapper.createSTable(tableMetadata);
+        return true;
+    }
+
+
+    public int insert(Rainfall rainfall) {
+        Map<String, Object> map = new HashMap<>();
+        map.put("dbname", "rainstation");
+        map.put("table", "S_53646");
+        map.put("stable", "monitoring");
+        map.put("values", rainfall);
+        return rainfallMapper.save(map);
+    }
+}
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/service/WeatherService.java
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/jdbc/springbootdemo/service/WeatherService.java
@ -14,10 +14,8 @@ public class WeatherService {
    private WeatherMapper weatherMapper;

    public boolean init() {
-
        weatherMapper.createDB();
        weatherMapper.createTable();
-
        return true;
    }

--- a/tests/examples/JDBC/springbootdemo/src/main/resources/application.properties
+++ b/tests/examples/JDBC/springbootdemo/src/main/resources/application.properties
@ -1,6 +1,6 @@
 # datasource config
 spring.datasource.driver-class-name=com.taosdata.jdbc.TSDBDriver
-spring.datasource.url=jdbc:TAOS://127.0.0.1:6030/log
+spring.datasource.url=jdbc:TAOS://localhost:6030/log
 spring.datasource.username=root
 spring.datasource.password=taosdata

--- a/tests/pytest/crash_gen.sh
+++ b/tests/pytest/crash_gen.sh
@ -49,4 +49,4 @@ export PYTHONPATH=$(pwd)/../../src/connector/python/linux/python3
 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$LIB_DIR

 # Now we are all let, and let's see if we can find a crash. Note we pass all params
-python3 ./crash_gen.py $@
+python3.8 ./crash_gen.py $@
--- a/tests/pytest/insert/tagSepcified.py
+++ b/tests/pytest/insert/tagSepcified.py
@ -0,0 +1,49 @@
+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+from util.log import *
+from util.cases import *
+from util.sql import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+
+        tdSql.execute('create table xcxlog (ts timestamp, user_id int, path BINARY(40),scene int) tags(appid bigint, adzone_id int,ip bigint,session_id bigint)')
+        tdSql.error("insert into d1000004(user_id,path,scene,ts) using xcxlog tags(1000004,145,97160) values (97160,'pagex/goods/taoke',1086,now)")
+        tdSql.execute("insert into d1000004_145(user_id,path,scene,ts) using xcxlog(appid,adzone_id,session_id,ip) tags(1000004,145,97160,1717171445) values (97160,'pagex/goods/taoke',1086,now)")
+        
+        tdSql.query("show tables")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, 'd1000004_145')
+
+        tdSql.query("select * from xcxlog")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 4, 1000004)
+        tdSql.checkData(0, 5, 145)
+        tdSql.checkData(0, 6, 1717171445)
+        tdSql.checkData(0, 7, 97160)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
--- a/tests/pytest/query/queryGroupbySort.py
+++ b/tests/pytest/query/queryGroupbySort.py
@ -0,0 +1,50 @@
+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+import taos
+from util.log import tdLog
+from util.cases import tdCases
+from util.sql import tdSql
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+        self.ts = 1537146000000
+
+    def run(self):
+        tdSql.prepare()
+
+        tdSql.execute(
+            "create table stb(ts timestamp,i int) tags (p_id nchar(20));")
+        tdSql.execute(
+            "insert into tb using stb tags('11231') values (%d, %d) (%d, %d) (%d, %d) (%d, %d)" 
+            % (self.ts, 12, self.ts + 1, 15, self.ts + 2, 15, self.ts + 3, 12))
+
+        tdSql.query(''' select last(ts) p_time,i from stb where p_id='11231' and ts>=%d and ts <=%d 
+            group by i order by time desc limit 100 ''' % (self.ts, self.ts + 4))
+        tdSql.checkRows(2)
+        tdSql.checkData(0, 0, "2018-09-17 09:00:00.003000")
+        tdSql.checkData(1, 0, "2018-09-17 09:00:00.002000")
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
--- a/tests/pytest/util/sql.py
+++ b/tests/pytest/util/sql.py
@ -123,7 +123,7 @@ class TDSql:

    def checkData(self, row, col, data):
        self.checkRowCol(row, col) 
-        if self.queryResult[row][col] != data:            
+        if str(self.queryResult[row][col]) != str(data): 
            if isinstance(data, float) and abs(self.queryResult[row][col] - data) <= 0.000001:                
                tdLog.info("sql:%s, row:%d col:%d data:%f == expect:%f" %
                            (self.sql, row, col, self.queryResult[row][col], data)) 
--- a/tests/script/general/compute/count.sim
+++ b/tests/script/general/compute/count.sim
@ -52,6 +52,12 @@ if $data00 != $rowNum then
  return -1
 endi

+sql select count(1) from $tb
+print ===> select count(1) from $tb => $data00
+if $data00 != $rowNum then 
+  return -1
+endi
+
 sql select count(tbcol) from $tb
 print ===> $data00
 if $data00 != $rowNum then 
@ -102,13 +108,20 @@ if $data00 != $totalNum then
  return -1
 endi

+print =============== step8
+sql select count(1) from $mt
+print ===> $data00
+if $data00 != $totalNum then 
+  return -1
+endi
+
 sql select count(tbcol) from $mt
 print ===> $data00
 if $data00 != $totalNum then 
  return -1
 endi

-print =============== step8
+print =============== step10
 sql select count(tbcol) as c from $mt where ts < now + 4m
 print ===> $data00
 if $data00 != 50 then 
--- a/tests/script/general/connection/mqtt.sim
+++ b/tests/script/general/connection/mqtt.sim
@ -0,0 +1,19 @@
+system sh/stop_dnodes.sh
+
+system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1 -c walLevel -v 2
+system sh/cfg.sh -n dnode1 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode1 -c mnodeEqualVnodeNum -v 4
+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 100000
+system sh/cfg.sh -n dnode1 -c http -v 1
+system sh/cfg.sh -n dnode1 -c mqtt -v 1
+
+system sh/exec.sh -n dnode1 -s start
+
+sleep 3000
+sql connect
+sql create database mqttdb;
+sql create table mqttdb.devices(ts timestamp, value double) tags(name binary(32), model binary(32), serial binary(16), param binary(16), unit binary(16));
+
+sleep 1000
+system sh/exec.sh -n dnode1 -s stop -x SIGINT
--- a/tests/script/general/db/alter_option.sim
+++ b/tests/script/general/db/alter_option.sim
@ -7,11 +7,10 @@ system sh/exec.sh -n dnode1 -s start

 sleep 3000
 sql connect
-print ============================ dnode1 start

+print ============= create database
 sql create database db cache 2 blocks 4 days 10 keep 20 minRows 300 maxRows 400 ctime 120 precision 'ms' comp 2 wal 1 replica 1
 sql show databases
-print $data00 $data01 $data02 $data03 $data04 $data05 $data06 $data07 $data08 $data09 
 if $data00 != db then 
  return -1
 endi
@ -37,27 +36,240 @@ if $data09 != 4 then
  return -1
 endi

-print =============== step2
-system sh/exec.sh -n dnode1 -s stop -x SIGINT
-return
-sql_error alter database db cache 256
-sql_error alter database db blocks 1
-sql_error alter database db days 10
-sql_error alter database db keep 10
-sql_error alter database db minRows 350
-sql_error alter database db minRows 550
-sql_error alter database db ctime 5000
-sql_error alter database db precision "us"
-sql_error alter database db comp 3
-sql_error alter database db wal 1
+print ============== step name
+sql_error alter database db name d1
+sql_error alter database db name d2
+
+print ============== step ntables
+sql_error alter database db ntables -1
+sql_error alter database db ntables 0
+sql_error alter database db ntables 1
+sql_error alter database db ntables 10
+
+print ============== step vgroups
+sql_error alter database db vgroups -1
+sql_error alter database db vgroups 0
+sql_error alter database db vgroups 1
+sql_error alter database db vgroups 10
+
+print ============== step replica
 sql_error alter database db replica 2
+sql_error alter database db replica 3
+sql_error alter database db replica 0

+sql alter database db replica 1
+sql show databases
+print replica $data4_db
+if $data4_db != 1 then 
+  return -1
+endi
+
+print ============== step quorum
+sql show databases
+print quorum $data5_db
+if $data5_db != 1 then 
+  return -1
+endi
+
+sql alter database db quorum 1
+sql show databases
+print quorum $data5_db
+if $data5_db != 1 then 
+  return -1
+endi
+
+sql alter database db quorum 2
+sql show databases
+print quorum $data5_db
+if $data5_db != 2 then 
+  return -1
+endi
+
+sql alter database db quorum 3
+sql show databases
+print quorum $data5_db
+if $data5_db != 3 then 
+  return -1
+endi
+
+sql alter database db quorum 3
+sql alter database db quorum 2
+sql alter database db quorum 1
+sql_error alter database db quorum 0
+sql_error alter database db quorum 4
+sql_error alter database db quorum 5
+sql_error alter database db quorum -1
+
+print ============== step days
+sql_error alter database db days 0
+sql_error alter database db days 1
+sql_error alter database db days 2
+sql_error alter database db days 10
+sql_error alter database db days 50
+sql_error alter database db days 100
+
+print ============== step keep
+sql show databases
+print keep $data7_db
+if $data7_db != 20,20,20 then 
+  return -1
+endi
+
+sql alter database db keep 10
+sql show databases
+print keep $data7_db
+if $data7_db != 20,20,10 then 
+  return -1
+endi
+
+sql alter database db keep 20
+sql show databases
+print keep $data7_db
+if $data7_db != 20,20,20 then 
+  return -1
+endi

-print ============== step3
-sql alter database db comp 1
-sql alter database db blocks 40
 sql alter database db keep 30
+sql show databases
+print keep $data7_db
+if $data7_db != 20,20,30 then 
+  return -1
+endi
+
+sql alter database db keep 40
+sql alter database db keep 30
+sql alter database db keep 20
+sql alter database db keep 10
+sql_error alter database db keep 9
+sql_error alter database db keep 1
+sql alter database db keep 0
+sql alter database db keep -1
+sql_error alter database db keep 365001
+
+print ============== step cache
+sql_error alter database db cache 60
+sql_error alter database db cache 50
+sql_error alter database db cache 20
+sql_error alter database db cache 3
+sql_error alter database db cache 129
+sql_error alter database db cache 300
+sql_error alter database db cache 0
+sql_error alter database db cache -1
+
+print ============== step blocks
+sql show databases
+print blocks $data9_db
+if $data9_db != 4 then 
+  return -1
+endi
+
+sql alter database db blocks 10
+sql show databases
+print blocks $data9_db
+if $data9_db != 10 then 
+  return -1
+endi
+
+sql alter database db blocks 20
+sql show databases
+print blocks $data9_db
+if $data9_db != 20 then 
+  return -1
+endi
+
+sql alter database db blocks 30
+sql show databases
+print blocks $data9_db
+if $data9_db != 30 then 
+  return -1
+endi
+
+sql alter database db blocks 40
+sql alter database db blocks 30
+sql alter database db blocks 20
+sql alter database db blocks 10
+sql_error alter database db blocks 2
+sql_error alter database db blocks 1
+sql alter database db blocks 0
+sql_error alter database db blocks -1
+sql_error alter database db blocks 10001
+
+print ============== step minrows
+sql_error alter database db minrows 1
+sql_error alter database db minrows 100
+sql_error alter database db minrows 1000
+
+print ============== step maxrows
+sql_error alter database db maxrows 1
+sql_error alter database db maxrows 100
+sql_error alter database db maxrows 1000
+
+print ============== step wallevel
+sql show databases
+print wallevel $data12_db
+if $data12_db != 1 then 
+  return -1
+endi
+
+sql alter database db wal 1
+sql show databases
+print wal $data12_db
+if $data12_db != 1 then 
+  return -1
+endi
+
+sql_error alter database db wal 2
+sql_error alter database db wal 0
+sql_error alter database db wal 3
+sql_error alter database db wal 4
+sql_error alter database db wal -1
+sql_error alter database db wal 1000
+
+print ============== step fsync
+sql_error alter database db fsync 2
+sql_error alter database db fsync 3
+sql_error alter database db fsync 4
+sql_error alter database db fsync -1
+sql_error alter database db fsync 1000
+
+print ============== step comp
+sql show databases
+print comp $data14_db
+if $data14_db != 2 then 
+  return -1
+endi
+
+sql alter database db comp 1
+sql show databases
+print comp $data14_db
+if $data14_db != 1 then 
+  return -1
+endi
+
+sql alter database db comp 2
+sql show databases
+print comp $data14_db
+if $data14_db != 2 then 
+  return -1
+endi
+
+sql alter database db comp 0
+sql show databases
+print comp $data14_db
+if $data14_db != 0 then 
+  return -1
+endi
+
+sql_error alter database db comp 3
+sql_error alter database db comp 4
+sql_error alter database db comp 5
+sql_error alter database db comp -1


+print ============== step precision
+sql_error alter database db prec 'us'

-#system sh/exec.sh -n dnode1 -s stop -x SIGINT
+print ============== step status
+sql_error alter database db status 'delete'
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT
--- a/tests/script/general/db/delete_reusevnode.sim
+++ b/tests/script/general/db/delete_reusevnode.sim
@ -50,7 +50,7 @@ $tbPrefix = t
 $i = 0
 while $i < 10
  $db = db . $i
-  sql create database $db maxTables 4
+  sql create database $db
  sql use $db

  sql create table st (ts timestamp, i int) tags(j int);
--- a/tests/script/general/db/delete_reusevnode2.sim
+++ b/tests/script/general/db/delete_reusevnode2.sim
@ -8,7 +8,7 @@ sql connect

 print ======== step1

-sql create database db maxTables 4;
+sql create database db;
 sql use db

 $tbPrefix = t
--- a/tests/script/general/db/dropdnodes.sim
+++ b/tests/script/general/db/dropdnodes.sim
@ -15,7 +15,7 @@ sql connect
 sql create dnode $hostname2
 sleep 2000

-sql create database db maxTables 4
+sql create database db
 sql use db

 print ==========  step1
--- a/tests/script/general/insert/insert_drop.sim
+++ b/tests/script/general/insert/insert_drop.sim
@ -19,7 +19,7 @@ $stb = stb

 sql drop database $db -x step1
 step1:
-sql create database $db maxtables 10 ctime 30
+sql create database $db ctime 30
 print ====== create tables
 sql use $db
 sql create table $stb (ts timestamp, c1 int) tags(t1 int)
--- a/tests/script/general/parser/commit.sim
+++ b/tests/script/general/parser/commit.sim
@ -2,6 +2,7 @@ system sh/stop_dnodes.sh

 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
+system sh/cfg.sh -n dnode1 -c maxTablesperVnode -v 100
 system sh/exec.sh -n dnode1 -s start
 sleep 3000
 sql connect
@ -23,7 +24,7 @@ $stb = $stbPrefix . $i

 sql drop database $db -x step1
 step1:
-sql create database $db maxrows 255 maxtables 100 ctime 3600
+sql create database $db maxrows 255 ctime 3600
 print ====== create tables
 sql use $db
 sql create table $stb (ts timestamp, c1 int, c2 bigint, c3 float, c4 double, c5 smallint, c6 tinyint, c7 bool, c8 binary(10), c9 nchar(10)) tags(t1 int)
--- a/Show More
+++ b/Show More