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| title | sidebar_label | slug |
|---|---|---|
| taosAdapter Reference | taosAdapter | /tdengine-reference/components/taosadapter |
import Image from '@theme/IdealImage'; import imgAdapter from '../../assets/taosadapter-01.png'; import Prometheus from "../../assets/resources/_prometheus.mdx" import CollectD from "../../assets/resources/_collectd.mdx" import StatsD from "../../assets/resources/_statsd.mdx" import Icinga2 from "../../assets/resources/_icinga2.mdx" import TCollector from "../../assets/resources/_tcollector.mdx"
taosAdapter is a companion tool for TDengine, serving as a bridge and adapter between the TDengine cluster and applications. It provides an easy and efficient way to ingest data directly from data collection agents (such as Telegraf, StatsD, collectd, etc.). It also offers InfluxDB/OpenTSDB compatible data ingestion interfaces, allowing InfluxDB/OpenTSDB applications to be seamlessly ported to TDengine.
taosAdapter offers the following features:
- RESTful interface
- Compatible with InfluxDB v1 write interface
- Compatible with OpenTSDB JSON and telnet format writing
- Seamless connection to Telegraf
- Seamless connection to collectd
- Seamless connection to StatsD
- Supports Prometheus remote_read and remote_write
- Retrieves the VGroup ID of the virtual node group (VGroup) where the table is located
taosAdapter Architecture Diagram
Deployment Methods for taosAdapter
Installing taosAdapter
taosAdapter is part of the TDengine server software. If you are using TDengine server, you do not need any additional steps to install taosAdapter. If you need to deploy taosAdapter separately from the TDengine server, you should install the complete TDengine on that server to install taosAdapter. If you need to compile taosAdapter from source code, you can refer to the Build taosAdapter document.
Starting/Stopping taosAdapter
On Linux systems, the taosAdapter service is managed by default by systemd. Use the command systemctl start taosadapter to start the taosAdapter service. Use the command systemctl stop taosadapter to stop the taosAdapter service.
Removing taosAdapter
Use the command rmtaos to remove the TDengine server software, including taosAdapter.
Upgrading taosAdapter
taosAdapter and TDengine server need to use the same version. Please upgrade taosAdapter by upgrading the TDengine server. taosAdapter deployed separately from taosd must be upgraded by upgrading the TDengine server on its server.
taosAdapter Parameter List
taosAdapter supports configuration through command-line parameters, environment variables, and configuration files. The default configuration file is /etc/taos/taosadapter.toml.
Command-line parameters take precedence over environment variables, which take precedence over configuration files. The command-line usage is arg=val, such as taosadapter -p=30000 --debug=true, detailed list as follows:
Usage of taosAdapter:
--collectd.db string collectd db name. Env "TAOS_ADAPTER_COLLECTD_DB" (default "collectd")
--collectd.enable enable collectd. Env "TAOS_ADAPTER_COLLECTD_ENABLE" (default true)
--collectd.password string collectd password. Env "TAOS_ADAPTER_COLLECTD_PASSWORD" (default "taosdata")
--collectd.port int collectd server port. Env "TAOS_ADAPTER_COLLECTD_PORT" (default 6045)
--collectd.ttl int collectd data ttl. Env "TAOS_ADAPTER_COLLECTD_TTL"
--collectd.user string collectd user. Env "TAOS_ADAPTER_COLLECTD_USER" (default "root")
--collectd.worker int collectd write worker. Env "TAOS_ADAPTER_COLLECTD_WORKER" (default 10)
-c, --config string config path default /etc/taos/taosadapter.toml
--cors.allowAllOrigins cors allow all origins. Env "TAOS_ADAPTER_CORS_ALLOW_ALL_ORIGINS" (default true)
--cors.allowCredentials cors allow credentials. Env "TAOS_ADAPTER_CORS_ALLOW_Credentials"
--cors.allowHeaders stringArray cors allow HEADERS. Env "TAOS_ADAPTER_ALLOW_HEADERS"
--cors.allowOrigins stringArray cors allow origins. Env "TAOS_ADAPTER_ALLOW_ORIGINS"
--cors.allowWebSockets cors allow WebSockets. Env "TAOS_ADAPTER_CORS_ALLOW_WebSockets"
--cors.exposeHeaders stringArray cors expose headers. Env "TAOS_ADAPTER_Expose_Headers"
--debug enable debug mode. Env "TAOS_ADAPTER_DEBUG" (default true)
--help Print this help message and exit
--httpCodeServerError Use a non-200 http status code when server returns an error. Env "TAOS_ADAPTER_HTTP_CODE_SERVER_ERROR"
--influxdb.enable enable influxdb. Env "TAOS_ADAPTER_INFLUXDB_ENABLE" (default true)
--instanceId int instance ID. Env "TAOS_ADAPTER_INSTANCE_ID" (default 32)
--log.compress whether to compress old log. Env "TAOS_ADAPTER_LOG_COMPRESS"
--log.enableRecordHttpSql whether to record http sql. Env "TAOS_ADAPTER_LOG_ENABLE_RECORD_HTTP_SQL"
--log.level string log level (trace debug info warning error). Env "TAOS_ADAPTER_LOG_LEVEL" (default "info")
--log.path string log path. Env "TAOS_ADAPTER_LOG_PATH" (default "/var/log/taos")
--log.reservedDiskSize string reserved disk size for log dir (KB MB GB), must be a positive integer. Env "TAOS_ADAPTER_LOG_RESERVED_DISK_SIZE" (default "1GB")
--log.rotationCount uint log rotation count. Env "TAOS_ADAPTER_LOG_ROTATION_COUNT" (default 30)
--log.rotationSize string log rotation size(KB MB GB), must be a positive integer. Env "TAOS_ADAPTER_LOG_ROTATION_SIZE" (default "1GB")
--log.rotationTime duration deprecated: log rotation time always 24 hours. Env "TAOS_ADAPTER_LOG_ROTATION_TIME" (default 24h0m0s)
--log.sqlRotationCount uint record sql log rotation count. Env "TAOS_ADAPTER_LOG_SQL_ROTATION_COUNT" (default 2)
--log.sqlRotationSize string record sql log rotation size(KB MB GB), must be a positive integer. Env "TAOS_ADAPTER_LOG_SQL_ROTATION_SIZE" (default "1GB")
--log.sqlRotationTime duration record sql log rotation time. Env "TAOS_ADAPTER_LOG_SQL_ROTATION_TIME" (default 24h0m0s)
--logLevel string log level (trace debug info warning error). Env "TAOS_ADAPTER_LOG_LEVEL" (default "info")
--monitor.collectDuration duration Set monitor duration. Env "TAOS_ADAPTER_MONITOR_COLLECT_DURATION" (default 3s)
--monitor.disable Whether to disable monitoring. Env "TAOS_ADAPTER_MONITOR_DISABLE" (default true)
--monitor.identity string The identity of the current instance, or 'hostname:port' if it is empty. Env "TAOS_ADAPTER_MONITOR_IDENTITY"
--monitor.incgroup Whether running in cgroup. Env "TAOS_ADAPTER_MONITOR_INCGROUP"
--monitor.pauseAllMemoryThreshold float Memory percentage threshold for pause all. Env "TAOS_ADAPTER_MONITOR_PAUSE_ALL_MEMORY_THRESHOLD" (default 80)
--monitor.pauseQueryMemoryThreshold float Memory percentage threshold for pause query. Env "TAOS_ADAPTER_MONITOR_PAUSE_QUERY_MEMORY_THRESHOLD" (default 70)
--node_exporter.caCertFile string node_exporter ca cert file path. Env "TAOS_ADAPTER_NODE_EXPORTER_CA_CERT_FILE"
--node_exporter.certFile string node_exporter cert file path. Env "TAOS_ADAPTER_NODE_EXPORTER_CERT_FILE"
--node_exporter.db string node_exporter db name. Env "TAOS_ADAPTER_NODE_EXPORTER_DB" (default "node_exporter")
--node_exporter.enable enable node_exporter. Env "TAOS_ADAPTER_NODE_EXPORTER_ENABLE"
--node_exporter.gatherDuration duration node_exporter gather duration. Env "TAOS_ADAPTER_NODE_EXPORTER_GATHER_DURATION" (default 5s)
--node_exporter.httpBearerTokenString string node_exporter http bearer token. Env "TAOS_ADAPTER_NODE_EXPORTER_HTTP_BEARER_TOKEN_STRING"
--node_exporter.httpPassword string node_exporter http password. Env "TAOS_ADAPTER_NODE_EXPORTER_HTTP_PASSWORD"
--node_exporter.httpUsername string node_exporter http username. Env "TAOS_ADAPTER_NODE_EXPORTER_HTTP_USERNAME"
--node_exporter.insecureSkipVerify node_exporter skip ssl check. Env "TAOS_ADAPTER_NODE_EXPORTER_INSECURE_SKIP_VERIFY" (default true)
--node_exporter.keyFile string node_exporter cert key file path. Env "TAOS_ADAPTER_NODE_EXPORTER_KEY_FILE"
--node_exporter.password string node_exporter password. Env "TAOS_ADAPTER_NODE_EXPORTER_PASSWORD" (default "taosdata")
--node_exporter.responseTimeout duration node_exporter response timeout. Env "TAOS_ADAPTER_NODE_EXPORTER_RESPONSE_TIMEOUT" (default 5s)
--node_exporter.ttl int node_exporter data ttl. Env "TAOS_ADAPTER_NODE_EXPORTER_TTL"
--node_exporter.urls strings node_exporter urls. Env "TAOS_ADAPTER_NODE_EXPORTER_URLS" (default [http://localhost:9100])
--node_exporter.user string node_exporter user. Env "TAOS_ADAPTER_NODE_EXPORTER_USER" (default "root")
--opentsdb.enable enable opentsdb. Env "TAOS_ADAPTER_OPENTSDB_ENABLE" (default true)
--opentsdb_telnet.batchSize int opentsdb_telnet batch size. Env "TAOS_ADAPTER_OPENTSDB_TELNET_BATCH_SIZE" (default 1)
--opentsdb_telnet.dbs strings opentsdb_telnet db names. Env "TAOS_ADAPTER_OPENTSDB_TELNET_DBS" (default [opentsdb_telnet,collectd_tsdb,icinga2_tsdb,tcollector_tsdb])
--opentsdb_telnet.enable enable opentsdb telnet,warning: without auth info(default false). Env "TAOS_ADAPTER_OPENTSDB_TELNET_ENABLE"
--opentsdb_telnet.flushInterval duration opentsdb_telnet flush interval (0s means not valid) . Env "TAOS_ADAPTER_OPENTSDB_TELNET_FLUSH_INTERVAL"
--opentsdb_telnet.maxTCPConnections int max tcp connections. Env "TAOS_ADAPTER_OPENTSDB_TELNET_MAX_TCP_CONNECTIONS" (default 250)
--opentsdb_telnet.password string opentsdb_telnet password. Env "TAOS_ADAPTER_OPENTSDB_TELNET_PASSWORD" (default "taosdata")
--opentsdb_telnet.ports ints opentsdb_telnet tcp port. Env "TAOS_ADAPTER_OPENTSDB_TELNET_PORTS" (default [6046,6047,6048,6049])
--opentsdb_telnet.tcpKeepAlive enable tcp keep alive. Env "TAOS_ADAPTER_OPENTSDB_TELNET_TCP_KEEP_ALIVE"
--opentsdb_telnet.ttl int opentsdb_telnet data ttl. Env "TAOS_ADAPTER_OPENTSDB_TELNET_TTL"
--opentsdb_telnet.user string opentsdb_telnet user. Env "TAOS_ADAPTER_OPENTSDB_TELNET_USER" (default "root")
--pool.idleTimeout duration Set idle connection timeout. Env "TAOS_ADAPTER_POOL_IDLE_TIMEOUT"
--pool.maxConnect int max connections to server. Env "TAOS_ADAPTER_POOL_MAX_CONNECT"
--pool.maxIdle int max idle connections to server. Env "TAOS_ADAPTER_POOL_MAX_IDLE"
--pool.maxWait int max count of waiting for connection. Env "TAOS_ADAPTER_POOL_MAX_WAIT"
--pool.waitTimeout int wait for connection timeout seconds. Env "TAOS_ADAPTER_POOL_WAIT_TIMEOUT" (default 60)
-P, --port int http port. Env "TAOS_ADAPTER_PORT" (default 6041)
--prometheus.enable enable prometheus. Env "TAOS_ADAPTER_PROMETHEUS_ENABLE" (default true)
--restfulRowLimit int restful returns the maximum number of rows (-1 means no limit). Env "TAOS_ADAPTER_RESTFUL_ROW_LIMIT" (default -1)
--smlAutoCreateDB Whether to automatically create db when writing with schemaless. Env "TAOS_ADAPTER_SML_AUTO_CREATE_DB"
--statsd.allowPendingMessages int statsd allow pending messages. Env "TAOS_ADAPTER_STATSD_ALLOW_PENDING_MESSAGES" (default 50000)
--statsd.db string statsd db name. Env "TAOS_ADAPTER_STATSD_DB" (default "statsd")
--statsd.deleteCounters statsd delete counter cache after gather. Env "TAOS_ADAPTER_STATSD_DELETE_COUNTERS" (default true)
--statsd.deleteGauges statsd delete gauge cache after gather. Env "TAOS_ADAPTER_STATSD_DELETE_GAUGES" (default true)
--statsd.deleteSets statsd delete set cache after gather. Env "TAOS_ADAPTER_STATSD_DELETE_SETS" (default true)
--statsd.deleteTimings statsd delete timing cache after gather. Env "TAOS_ADAPTER_STATSD_DELETE_TIMINGS" (default true)
--statsd.enable enable statsd. Env "TAOS_ADAPTER_STATSD_ENABLE"
--statsd.gatherInterval duration statsd gather interval. Env "TAOS_ADAPTER_STATSD_GATHER_INTERVAL" (default 5s)
--statsd.maxTCPConnections int statsd max tcp connections. Env "TAOS_ADAPTER_STATSD_MAX_TCP_CONNECTIONS" (default 250)
--statsd.password string statsd password. Env "TAOS_ADAPTER_STATSD_PASSWORD" (default "taosdata")
--statsd.port int statsd server port. Env "TAOS_ADAPTER_STATSD_PORT" (default 6044)
--statsd.protocol string statsd protocol [tcp or udp]. Env "TAOS_ADAPTER_STATSD_PROTOCOL" (default "udp4")
--statsd.tcpKeepAlive enable tcp keep alive. Env "TAOS_ADAPTER_STATSD_TCP_KEEP_ALIVE"
--statsd.ttl int statsd data ttl. Env "TAOS_ADAPTER_STATSD_TTL"
--statsd.user string statsd user. Env "TAOS_ADAPTER_STATSD_USER" (default "root")
--statsd.worker int statsd write worker. Env "TAOS_ADAPTER_STATSD_WORKER" (default 10)
--taosConfigDir string load taos client config path. Env "TAOS_ADAPTER_TAOS_CONFIG_FILE"
--uploadKeeper.enable Whether to enable sending metrics to keeper. Env "TAOS_ADAPTER_UPLOAD_KEEPER_ENABLE" (default true)
--uploadKeeper.interval duration send to Keeper interval. Env "TAOS_ADAPTER_UPLOAD_KEEPER_INTERVAL" (default 15s)
--uploadKeeper.retryInterval duration retry interval. Env "TAOS_ADAPTER_UPLOAD_KEEPER_RETRY_INTERVAL" (default 5s)
--uploadKeeper.retryTimes uint retry times. Env "TAOS_ADAPTER_UPLOAD_KEEPER_RETRY_TIMES" (default 3)
--uploadKeeper.timeout duration send to Keeper timeout. Env "TAOS_ADAPTER_UPLOAD_KEEPER_TIMEOUT" (default 5s)
--uploadKeeper.url string Keeper url. Env "TAOS_ADAPTER_UPLOAD_KEEPER_URL" (default "http://127.0.0.1:6043/adapter_report")
-V, --version Print the version and exit
Note: When using a browser to make API calls, please set the following Cross-Origin Resource Sharing (CORS) parameters according to the actual situation:
AllowAllOrigins
AllowOrigins
AllowHeaders
ExposeHeaders
AllowCredentials
AllowWebSockets
If you are not making API calls through a browser, you do not need to worry about these configurations.
For details about the CORS protocol, please refer to: https://www.w3.org/wiki/CORS_Enabled or https://developer.mozilla.org/docs/Web/HTTP/CORS.
See the example configuration file at example/config/taosadapter.toml.
Connection Pool Parameters Description
When using the RESTful API, the system will manage TDengine connections through a connection pool. The connection pool can be configured with the following parameters:
pool.maxConnect: The maximum number of connections allowed in the pool, default is twice the number of CPU cores. It is recommended to keep the default setting.pool.maxIdle: The maximum number of idle connections in the pool, default is the same aspool.maxConnect. It is recommended to keep the default setting.pool.idleTimeout: Connection idle timeout, default is never timeout. It is recommended to keep the default setting.pool.waitTimeout: Timeout for obtaining a connection from the pool, default is set to 60 seconds. If a connection is not obtained within the timeout period, HTTP status code 503 will be returned. This parameter is available starting from version 3.3.3.0.pool.maxWait: The maximum number of requests waiting to get a connection in the pool, default is 0, which means no limit. When the number of queued requests exceeds this value, new requests will return HTTP status code 503. This parameter is available starting from version 3.3.3.0.
Feature List
- RESTful API RESTful API
- Compatible with InfluxDB v1 write interface https://docs.influxdata.com/influxdb/v2.0/reference/api/influxdb-1x/write/
- Compatible with OpenTSDB JSON and telnet format writing
- Seamless connection with collectd. collectd is a system statistics collection daemon, visit https://collectd.org/ for more information.
- Seamless connection with StatsD. StatsD is a simple yet powerful daemon for gathering statistics. Visit https://github.com/statsd/statsd for more information.
- Seamless connection with icinga2. icinga2 is a software for collecting check results metrics and performance data. Visit https://icinga.com/docs/icinga-2/latest/doc/14-features/#opentsdb-writer for more information.
- Seamless connection with tcollector. TCollector is a client process that collects data from local collectors and pushes it to OpenTSDB. Visit http://opentsdb.net/docs/build/html/user_guide/utilities/tcollector.html for more information.
- Seamless connection with node_exporter. node_exporter is an exporter of machine metrics. Visit https://github.com/prometheus/node_exporter for more information.
- Supports Prometheus remote_read and remote_write. remote_read and remote_write are Prometheus's data read-write separation cluster solutions. Visit https://prometheus.io/blog/2019/10/10/remote-read-meets-streaming/#remote-apis for more information.
- Get the VGroup ID of the virtual node group (VGroup) where the table is located.
Interface
TDengine RESTful Interface
You can use any client that supports the HTTP protocol to write data to TDengine or query data from TDengine by accessing the RESTful interface URL http://<fqdn>:6041/rest/sql. For details, please refer to the REST API documentation.
InfluxDB
You can use any client that supports the HTTP protocol to write data in InfluxDB compatible format to TDengine by accessing the Restful interface URL http://<fqdn>:6041/influxdb/v1/write.
Supported InfluxDB parameters are as follows:
dbspecifies the database name used by TDengineprecisionthe time precision used by TDengineuTDengine usernamepTDengine passwordttlthe lifespan of automatically created subtables, determined by the TTL parameter of the first data entry in the subtable, which cannot be updated. For more information, please refer to the TTL parameter in the table creation document.
Note: Currently, InfluxDB's token authentication method is not supported, only Basic authentication and query parameter verification are supported.
Example: curl --request POST http://127.0.0.1:6041/influxdb/v1/write?db=test --user "root:taosdata" --data-binary "measurement,host=host1 field1=2i,field2=2.0 1577836800000000000"
OpenTSDB
You can use any client that supports the HTTP protocol to write data in OpenTSDB compatible format to TDengine by accessing the Restful interface URL http://<fqdn>:6041/<APIEndPoint>. EndPoint as follows:
/opentsdb/v1/put/json/<db>
/opentsdb/v1/put/telnet/<db>
collectd
StatsD
icinga2 OpenTSDB writer
TCollector
node_exporter
An exporter used by Prometheus that exposes hardware and operating system metrics from *NIX kernels
- Enable configuration of taosAdapter node_exporter.enable
- Set the relevant configuration for node_exporter
- Restart taosAdapter
prometheus
Getting the VGroup ID of a table
You can access the HTTP interface http://<fqdn>:6041/rest/vgid?db=<db>&table=<table> to get the VGroup ID of a table.
Memory Usage Optimization Methods
taosAdapter will monitor its memory usage during operation and adjust it through two thresholds. Valid values range from -1 to 100 as a percentage of system physical memory.
- pauseQueryMemoryThreshold
- pauseAllMemoryThreshold
When the pauseQueryMemoryThreshold threshold is exceeded, it stops processing query requests.
HTTP return content:
- code 503
- body "query memory exceeds threshold"
When the pauseAllMemoryThreshold threshold is exceeded, it stops processing all write and query requests.
HTTP return content:
- code 503
- body "memory exceeds threshold"
When memory falls below the threshold, the corresponding functions are resumed.
Status check interface http://<fqdn>:6041/-/ping
- Normally returns
code 200 - No parameters If memory exceeds pauseAllMemoryThreshold, it will return
code 503 - Request parameter
action=queryIf memory exceeds either pauseQueryMemoryThreshold or pauseAllMemoryThreshold, it will returncode 503
Corresponding configuration parameters
monitor.collectDuration Monitoring interval Environment variable "TAOS_MONITOR_COLLECT_DURATION" (default value 3s)
monitor.incgroup Whether it is running in cgroup (set to true in containers) Environment variable "TAOS_MONITOR_INCGROUP"
monitor.pauseAllMemoryThreshold Memory threshold for stopping inserts and queries Environment variable "TAOS_MONITOR_PAUSE_ALL_MEMORY_THRESHOLD" (default value 80)
monitor.pauseQueryMemoryThreshold Memory threshold for stopping queries Environment variable "TAOS_MONITOR_PAUSE_QUERY_MEMORY_THRESHOLD" (default value 70)
You can adjust according to the specific project application scenario and operational strategy, and it is recommended to use operational monitoring software to monitor the system memory status in real time. Load balancers can also check the running status of taosAdapter through this interface.
taosAdapter Monitoring Metrics
taosAdapter collects monitoring metrics related to REST/WebSocket requests. These monitoring metrics are reported to taosKeeper, which writes them into the monitoring database, by default the log database, which can be modified in the taoskeeper configuration file. Below is a detailed introduction to these monitoring metrics.
adapter_requests table
adapter_requests records taosadapter monitoring data.
| field | type | is_tag | comment |
|---|---|---|---|
| ts | TIMESTAMP | timestamp | |
| total | INT UNSIGNED | total number of requests | |
| query | INT UNSIGNED | number of query requests | |
| write | INT UNSIGNED | number of write requests | |
| other | INT UNSIGNED | number of other requests | |
| in_process | INT UNSIGNED | number of requests in process | |
| success | INT UNSIGNED | number of successful requests | |
| fail | INT UNSIGNED | number of failed requests | |
| query_success | INT UNSIGNED | number of successful query requests | |
| query_fail | INT UNSIGNED | number of failed query requests | |
| write_success | INT UNSIGNED | number of successful write requests | |
| write_fail | INT UNSIGNED | number of failed write requests | |
| other_success | INT UNSIGNED | number of successful other requests | |
| other_fail | INT UNSIGNED | number of failed other requests | |
| query_in_process | INT UNSIGNED | number of query requests in process | |
| write_in_process | INT UNSIGNED | number of write requests in process | |
| endpoint | VARCHAR | request endpoint | |
| req_type | NCHAR | tag | request type: 0 for REST, 1 for WebSocket |
Result Return Limit
taosAdapter controls the number of results returned through the parameter restfulRowLimit, -1 represents no limit, default is no limit.
This parameter controls the return of the following interfaces
http://<fqdn>:6041/rest/sqlhttp://<fqdn>:6041/prometheus/v1/remote_read/:db
Configure HTTP Return Codes
taosAdapter uses the parameter httpCodeServerError to set whether to return a non-200 HTTP status code when the C interface returns an error. When set to true, it will return different HTTP status codes based on the error code returned by C. See HTTP Response Codes for details.
Configure Automatic DB Creation for Schemaless Writes
Starting from version 3.0.4.0, taosAdapter provides the parameter smlAutoCreateDB to control whether to automatically create a DB when writing via the schemaless protocol. The default value is false, which does not automatically create a DB, and requires the user to manually create a DB before performing schemaless writes.
Troubleshooting
You can check the running status of taosAdapter with the command systemctl status taosadapter.
You can also adjust the detail level of taosAdapter log output by setting the --logLevel parameter or the environment variable TAOS_ADAPTER_LOG_LEVEL. Valid values include: panic, fatal, error, warn, warning, info, debug, and trace.
How to Migrate from Older Versions of TDengine to taosAdapter
In TDengine server version 2.2.x.x or earlier, the taosd process included an embedded HTTP service. As mentioned earlier, taosAdapter is a standalone software managed by systemd, having its own process. Moreover, there are some differences in configuration parameters and behaviors between the two, as shown in the table below:
| # | embedded httpd | taosAdapter | comment |
|---|---|---|---|
| 1 | httpEnableRecordSql | --logLevel=debug | |
| 2 | httpMaxThreads | n/a | taosAdapter automatically manages the thread pool, this parameter is not needed |
| 3 | telegrafUseFieldNum | Please refer to taosAdapter telegraf configuration methods | |
| 4 | restfulRowLimit | restfulRowLimit | The embedded httpd defaults to outputting 10240 rows of data, with a maximum allowable value of 102400. taosAdapter also provides restfulRowLimit but does not impose a limit by default. You can configure it according to actual scenario needs. |
| 5 | httpDebugFlag | Not applicable | httpdDebugFlag does not affect taosAdapter |
| 6 | httpDBNameMandatory | Not applicable | taosAdapter requires the database name to be specified in the URL |