refactor: sync integrate into mnode

include/dnode/mnode/sdb/sdb.h

@@ -312,6 +312,8 @@ int64_t sdbGetTableVer(SSdb *pSdb, ESdbType type);
  */
 void    sdbSetApplyIndex(SSdb *pSdb, int64_t index);
 int64_t sdbGetApplyIndex(SSdb *pSdb);
+void    sdbSetApplyTerm(SSdb *pSdb, int64_t term);
+int64_t sdbGetApplyTerm(SSdb *pSdb);
 
 SSdbRaw *sdbAllocRaw(ESdbType type, int8_t sver, int32_t dataLen);
 void     sdbFreeRaw(SSdbRaw *pRaw);
@@ -340,6 +342,7 @@ typedef struct SSdb {
   char          *tmpDir;
   int64_t        lastCommitVer;
   int64_t        curVer;
+  int64_t        curTerm;
   int64_t        tableVer[SDB_MAX];
   int64_t        maxId[SDB_MAX];
   EKeyType       keyTypes[SDB_MAX];

source/dnode/mnode/impl/src/mndSync.c

@@ -53,6 +53,7 @@ static void mndSyncRollBackMsg(SSyncFSM *pFsm, const SRpcMsg *pMsg, SFsmCbMeta c
 static int32_t mndSyncGetSnapshot(SSyncFSM *pFsm, SSnapshot *pSnapshot) {
   SMnode *pMnode = pFsm->data;
   pSnapshot->lastApplyIndex = sdbGetApplyIndex(pMnode->pSdb);
+  pSnapshot->lastApplyTerm = sdbGetApplyTerm(pMnode->pSdb);
   return 0;
 }
 

source/dnode/mnode/sdb/src/sdb.c

@@ -53,6 +53,7 @@ SSdb *sdbInit(SSdbOpt *pOption) {
   }
 
   pSdb->curVer = -1;
+  pSdb->curTerm = -1;
   pSdb->lastCommitVer = -1;
   pSdb->pMnode = pOption->pMnode;
   mDebug("sdb init successfully");
@@ -159,3 +160,7 @@ static int32_t sdbCreateDir(SSdb *pSdb) {
 void sdbSetApplyIndex(SSdb *pSdb, int64_t index) { pSdb->curVer = index; }
 
 int64_t sdbGetApplyIndex(SSdb *pSdb) { return pSdb->curVer; }
+
+void sdbSetApplyTerm(SSdb *pSdb, int64_t term) { pSdb->curTerm = term; }
+
+int64_t sdbGetApplyTerm(SSdb *pSdb) { return pSdb->curTerm; }

source/dnode/mnode/sdb/src/sdbFile.c

@@ -65,6 +65,16 @@ static int32_t sdbReadFileHead(SSdb *pSdb, TdFilePtr pFile) {
     return -1;
   }
 
+  ret = taosReadFile(pFile, &pSdb->curTerm, sizeof(int64_t));
+  if (ret < 0) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    return -1;
+  }
+  if (ret != sizeof(int64_t)) {
+    terrno = TSDB_CODE_FILE_CORRUPTED;
+    return -1;
+  }
+
   for (int32_t i = 0; i < SDB_TABLE_SIZE; ++i) {
     int64_t maxId = 0;
     ret = taosReadFile(pFile, &maxId, sizeof(int64_t));
@@ -123,6 +133,11 @@ static int32_t sdbWriteFileHead(SSdb *pSdb, TdFilePtr pFile) {
     return -1;
   }
 
+  if (taosWriteFile(pFile, &pSdb->curTerm, sizeof(int64_t)) != sizeof(int64_t)) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    return -1;
+  }
+
   for (int32_t i = 0; i < SDB_TABLE_SIZE; ++i) {
     int64_t maxId = 0;
     if (i < SDB_MAX) {
@@ -182,6 +197,7 @@ int32_t sdbReadFile(SSdb *pSdb) {
   if (sdbReadFileHead(pSdb, pFile) != 0) {
     mError("failed to read file:%s head since %s", file, terrstr());
     pSdb->curVer = -1;
+    pSdb->curTerm = -1;
     taosMemoryFree(pRaw);
     taosCloseFile(&pFile);
     return -1;
@@ -256,8 +272,8 @@ static int32_t sdbWriteFileImp(SSdb *pSdb) {
   char curfile[PATH_MAX] = {0};
   snprintf(curfile, sizeof(curfile), "%s%ssdb.data", pSdb->currDir, TD_DIRSEP);
 
-  mDebug("start to write file:%s, current ver:%" PRId64 ", commit ver:%" PRId64, curfile, pSdb->curVer,
+  mDebug("start to write file:%s, current ver:%" PRId64 " term:%" PRId64 ", commit ver:%" PRId64, curfile, pSdb->curVer,
-         pSdb->lastCommitVer);
+         pSdb->curTerm, pSdb->lastCommitVer);
 
   TdFilePtr pFile = taosOpenFile(tmpfile, TD_FILE_CREATE | TD_FILE_WRITE | TD_FILE_TRUNC);
   if (pFile == NULL) {
@@ -350,7 +366,7 @@ static int32_t sdbWriteFileImp(SSdb *pSdb) {
     mError("failed to write file:%s since %s", curfile, tstrerror(code));
   } else {
     pSdb->lastCommitVer = pSdb->curVer;
-    mDebug("write file:%s successfully, ver:%" PRId64, curfile, pSdb->lastCommitVer);
+    mDebug("write file:%s successfully, ver:%" PRId64 " term:%" PRId64, curfile, pSdb->lastCommitVer, pSdb->curTerm);
   }
 
   terrno = code;

tests/test/c/sdbDump.c

@@ -294,6 +294,7 @@ void dumpTrans(SSdb *pSdb, SJson *json) {
 void dumpHeader(SSdb *pSdb, SJson *json) {
   tjsonAddIntegerToObject(json, "sver", 1);
   tjsonAddStringToObject(json, "curVer", i642str(pSdb->curVer));
+  tjsonAddStringToObject(json, "curTerm", i642str(pSdb->curTerm));
 
   SJson *maxIdsJson = tjsonCreateObject();
   tjsonAddItemToObject(json, "maxIds", maxIdsJson);