[TD-4671]<fix>: mark dropped dnode in dnodeCfg.json & exit early when startup

src/dnode/inc/dnodeCfg.h

@@ -27,6 +27,7 @@ void    dnodeUpdateCfg(SDnodeCfg *cfg);
 int32_t dnodeGetDnodeId();
 void    dnodeGetClusterId(char *clusterId);
 void    dnodeGetCfg(int32_t *dnodeId, char *clusterId);
+void    dnodeSetDropped();
 
 #ifdef __cplusplus
 }

src/dnode/src/dnodeCfg.c

@@ -21,6 +21,7 @@
 
 static SDnodeCfg tsCfg = {0};
 static pthread_mutex_t tsCfgMutex;
+static int32_t tsDnodeDropped;
 
 static int32_t dnodeReadCfg();
 static int32_t dnodeWriteCfg();
@@ -34,6 +35,10 @@ int32_t dnodeInitCfg() {
   if (ret == 0) {
     dInfo("dnode cfg is initialized");
   }
+  if (tsDnodeDropped) {
+    dInfo("dnode is dropped, exiting");
+    return -1;
+  }
   return ret;
 }
 
@@ -44,6 +49,14 @@ void dnodeUpdateCfg(SDnodeCfg *cfg) {
   dnodeResetCfg(cfg);
 }
 
+void dnodeSetDropped() {
+  pthread_mutex_lock(&tsCfgMutex);
+  tsDnodeDropped = 1;
+
+  dnodeWriteCfg();
+  pthread_mutex_unlock(&tsCfgMutex);
+}
+
 int32_t dnodeGetDnodeId() {
   int32_t dnodeId = 0;
   pthread_mutex_lock(&tsCfgMutex);
@@ -119,6 +132,14 @@ static int32_t dnodeReadCfg() {
   }
   cfg.dnodeId = (int32_t)dnodeId->valueint;
 
+  cJSON *dnodeDropped = cJSON_GetObjectItem(root, "dnodeDropped");
+  if (!dnodeDropped || dnodeDropped->type != cJSON_Number) {
+    dError("failed to read %s, dnodeDropped not found", file);
+    //goto PARSE_CFG_OVER;
+  } else {
+    tsDnodeDropped = (int32_t)dnodeDropped->valueint;
+  }
+
   cJSON *clusterId = cJSON_GetObjectItem(root, "clusterId");
   if (!clusterId || clusterId->type != cJSON_String) {
     dError("failed to read %s, clusterId not found", file);
@@ -154,6 +175,7 @@ static int32_t dnodeWriteCfg() {
 
   len += snprintf(content + len, maxLen - len, "{\n");
   len += snprintf(content + len, maxLen - len, "  \"dnodeId\": %d,\n", tsCfg.dnodeId);
+  len += snprintf(content + len, maxLen - len, "  \"dnodeDropped\": %d,\n", tsDnodeDropped);
   len += snprintf(content + len, maxLen - len, "  \"clusterId\": \"%s\"\n", tsCfg.clusterId);
   len += snprintf(content + len, maxLen - len, "}\n");
 

src/dnode/src/dnodeVnodes.c

@@ -202,6 +202,7 @@ static void dnodeProcessStatusRsp(SRpcMsg *pMsg) {
       char clusterId[TSDB_CLUSTER_ID_LEN];
       dnodeGetClusterId(clusterId);
       if (clusterId[0] != '\0') {
+        dnodeSetDropped();
         dError("exit zombie dropped dnode");
         exit(EXIT_FAILURE);
       }