[TD-5806]<feature>:add role_time to show mnodes

src/mnode/inc/mnodeDef.h

@@ -80,6 +80,7 @@ typedef struct SMnodeObj {
   int8_t     updateEnd[4];
   int32_t    refCount;
   int8_t     role;
+  int64_t    roleTime;
   int8_t     reserved2[3];
 } SMnodeObj;
 

src/mnode/src/mnodeMnode.c

@@ -122,6 +122,7 @@ static int32_t mnodeMnodeActionRestored() {
     void *pIter = mnodeGetNextMnode(NULL, &pMnode);
     if (pMnode != NULL) {
       pMnode->role = TAOS_SYNC_ROLE_MASTER;
+      pMnode->roleTime = taosGetTimestampMs();
       mnodeDecMnodeRef(pMnode);
     }
     mnodeCancelGetNextMnode(pIter);
@@ -496,7 +497,13 @@ static int32_t mnodeGetMnodeMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pC
   strcpy(pSchema[cols].name, "role");
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
-  
+
+  pShow->bytes[cols] = 8;
+  pSchema[cols].type = TSDB_DATA_TYPE_TIMESTAMP;
+  strcpy(pSchema[cols].name, "role_time");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
   pShow->bytes[cols] = 8;
   pSchema[cols].type = TSDB_DATA_TYPE_TIMESTAMP;
   strcpy(pSchema[cols].name, "create_time");
@@ -552,6 +559,10 @@ static int32_t mnodeRetrieveMnodes(SShowObj *pShow, char *data, int32_t rows, vo
     STR_WITH_MAXSIZE_TO_VARSTR(pWrite, roles, pShow->bytes[cols]);
     cols++;
 
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int64_t *)pWrite = pMnode->roleTime;
+    cols++;
+
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
     *(int64_t *)pWrite = pMnode->createdTime;
     cols++;

src/mnode/src/mnodeSdb.c

@@ -227,6 +227,7 @@ void sdbUpdateMnodeRoles() {
     SMnodeObj *pMnode = mnodeGetMnode(roles.nodeId[i]);
     if (pMnode != NULL) {
       if (pMnode->role != roles.role[i]) {
+        pMnode->roleTime = taosGetTimestampMs();
         bnNotify();
       }
 

tests/pytest/client/client.py

@@ -16,6 +16,7 @@ from util.log import *
 from util.cases import *
 from util.sql import *
 
+from datetime import timedelta
 
 class TDTestCase:
     def init(self, conn, logSql):
@@ -41,6 +42,16 @@ class TDTestCase:
 
         ret = tdSql.query('show mnodes')
         tdSql.checkRows(1)
+        tdSql.checkData(0, 2, "master")
+
+        role_time = tdSql.getData(0, 3)
+        create_time = tdSql.getData(0, 4)
+        time_delta = timedelta(milliseconds=100)
+
+        if create_time-time_delta < role_time < create_time+time_delta:
+            tdLog.info("role_time {} and create_time {} expected within range".format(role_time, create_time))
+        else:
+            tdLog.exit("role_time {} and create_time {} not expected within range".format(role_time, create_time))    
 
         ret = tdSql.query('show vgroups')
         tdSql.checkRows(0)