set tsdb to NULL if vnode needs to reset tsdb

src/vnode/src/vnodeMain.c

@@ -193,10 +193,12 @@ int32_t vnodeAlter(void *param, SMDCreateVnodeMsg *pVnodeCfg) {
     return code; 
   } 
 
-  code = tsdbConfigRepo(pVnode->tsdb, &pVnode->tsdbCfg);
-  if (code != TSDB_CODE_SUCCESS) {
-    pVnode->status = TAOS_VN_STATUS_READY;
-    return code; 
+  if (pVnode->tsdb) {
+    code = tsdbConfigRepo(pVnode->tsdb, &pVnode->tsdbCfg);
+    if (code != TSDB_CODE_SUCCESS) {
+      pVnode->status = TAOS_VN_STATUS_READY;
+      return code; 
+    }
   }
 
   pVnode->status = TAOS_VN_STATUS_READY;
@@ -572,7 +574,9 @@ static void vnodeNotifyFileSynced(void *ahandle, uint64_t fversion) {
   char rootDir[128] = "\0";
   sprintf(rootDir, "%s/tsdb", pVnode->rootDir);
   // clsoe tsdb, then open tsdb
-  tsdbCloseRepo(pVnode->tsdb, 0);
+  void *tsdb = pVnode->tsdb;
+  pVnode->tsdb = NULL;
+  tsdbCloseRepo(tsdb, 0);
   STsdbAppH appH = {0};
   appH.appH = (void *)pVnode;
   appH.notifyStatus = vnodeProcessTsdbStatus;

src/vnode/src/vnodeWrite.c

@@ -59,13 +59,16 @@ int32_t vnodeProcessWrite(void *param1, int qtype, void *param2, void *item) {
     return TSDB_CODE_VND_NO_WRITE_AUTH;
   }
 
+  // tsdb may be in reset state 
+  if (pVnode->tsdb == NULL) return 0;
+  
   if (pHead->version == 0) { // from client or CQ 
     if (pVnode->status != TAOS_VN_STATUS_READY) {
       vDebug("vgId:%d, msgType:%s not processed, vnode status is %d", pVnode->vgId, taosMsg[pHead->msgType], pVnode->status);
       return TSDB_CODE_VND_INVALID_STATUS;  // it may be in deleting or closing state
     }
 
-    if (pVnode->syncCfg.replica > 1 && pVnode->role != TAOS_SYNC_ROLE_MASTER) {
+    if (pVnode->role != TAOS_SYNC_ROLE_MASTER) {
       vDebug("vgId:%d, msgType:%s not processed, replica:%d role:%d", pVnode->vgId, taosMsg[pHead->msgType], pVnode->syncCfg.replica, pVnode->role);
       return TSDB_CODE_RPC_NOT_READY;
     }