Merge pull request #7435 from taosdata/hotfix/TD-6131

[TD-6131]<fix>  taosd crash  when 'show vnodes ' return too many results 

src/common/inc/tglobal.h

@@ -107,6 +107,9 @@ extern int32_t tsQuorum;
 extern int8_t  tsUpdate;
 extern int8_t  tsCacheLastRow;
 
+//tsdb 
+extern bool tsdbForceKeepFile;
+
 // balance
 extern int8_t  tsEnableBalance;
 extern int8_t  tsAlternativeRole;

src/common/src/tglobal.c

@@ -151,6 +151,11 @@ int32_t tsMinTablePerVnode = TSDB_TABLES_STEP;
 int32_t tsMaxTablePerVnode = TSDB_DEFAULT_TABLES;
 int32_t tsTableIncStepPerVnode = TSDB_TABLES_STEP;
 
+// tsdb config 
+
+// For backward compatibility
+bool tsdbForceKeepFile = false;
+
 // balance
 int8_t  tsEnableBalance = 1;
 int8_t  tsAlternativeRole = 0;

src/mnode/inc/mnodeDef.h

@@ -274,6 +274,7 @@ typedef struct {
   int32_t  rowSize;
   int32_t  numOfRows;
   void *   pIter;
+  void *   pVgIter;
   void **  ppShow;
   int16_t  offset[TSDB_MAX_COLUMNS];
   int32_t  bytes[TSDB_MAX_COLUMNS];

src/mnode/src/mnodeDnode.c

@@ -196,14 +196,20 @@ int32_t mnodeInitDnodes() {
   mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_CREATE_DNODE, mnodeProcessCreateDnodeMsg);
   mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_DROP_DNODE, mnodeProcessDropDnodeMsg); 
   mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_CONFIG_DNODE, mnodeProcessCfgDnodeMsg);
+
   mnodeAddPeerRspHandle(TSDB_MSG_TYPE_MD_CONFIG_DNODE_RSP, mnodeProcessCfgDnodeMsgRsp);
   mnodeAddPeerMsgHandle(TSDB_MSG_TYPE_DM_STATUS, mnodeProcessDnodeStatusMsg);
+
   mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_MODULE, mnodeGetModuleMeta);
   mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_MODULE, mnodeRetrieveModules);
+
   mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_VARIABLES, mnodeGetConfigMeta);
   mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_VARIABLES, mnodeRetrieveConfigs);
+
   mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_VNODES, mnodeGetVnodeMeta);
   mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_VNODES, mnodeRetrieveVnodes);
+  mnodeAddShowFreeIterHandle(TSDB_MGMT_TABLE_VNODES, mnodeCancelGetNextVgroup);
+
   mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_DNODE, mnodeGetDnodeMeta);
   mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_DNODE, mnodeRetrieveDnodes);
   mnodeAddShowFreeIterHandle(TSDB_MGMT_TABLE_DNODE, mnodeCancelGetNextDnode);
@@ -1232,13 +1238,12 @@ static int32_t mnodeRetrieveVnodes(SShowObj *pShow, char *data, int32_t rows, vo
 
   pDnode = (SDnodeObj *)(pShow->pIter);
   if (pDnode != NULL) {
-    void *pIter = NULL;
     SVgObj *pVgroup;
     while (1) {
-      pIter = mnodeGetNextVgroup(pIter, &pVgroup);
+      pShow->pVgIter = mnodeGetNextVgroup(pShow->pVgIter, &pVgroup);
       if (pVgroup == NULL) break;
 
-      for (int32_t i = 0; i < pVgroup->numOfVnodes; ++i) {
+      for (int32_t i = 0; i < pVgroup->numOfVnodes && numOfRows < rows; ++i) {
         SVnodeGid *pVgid = &pVgroup->vnodeGid[i];
         if (pVgid->pDnode == pDnode) {
           cols = 0;
@@ -1250,10 +1255,13 @@ static int32_t mnodeRetrieveVnodes(SShowObj *pShow, char *data, int32_t rows, vo
           pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
           STR_TO_VARSTR(pWrite, syncRole[pVgid->role]);
           cols++;
-
           numOfRows++;
+          
         }
       }
+      if (numOfRows >= rows) {
+        break;
+      }
 
       mnodeDecVgroupRef(pVgroup);
     }

src/mnode/src/mnodeShow.c

@@ -422,8 +422,13 @@ static void* mnodePutShowObj(SShowObj *pShow) {
 
 static void mnodeFreeShowObj(void *data) {
   SShowObj *pShow = *(SShowObj **)data;
-  if (tsMnodeShowFreeIterFp[pShow->type] != NULL && pShow->pIter != NULL) {
-    (*tsMnodeShowFreeIterFp[pShow->type])(pShow->pIter);
+  if (tsMnodeShowFreeIterFp[pShow->type] != NULL) {
+    if (pShow->pVgIter != NULL) {
+      // only used in 'show vnodes "ep"'
+      (*tsMnodeShowFreeIterFp[pShow->type])(pShow->pVgIter);
+    } else {
+      if (pShow->pIter != NULL) (*tsMnodeShowFreeIterFp[pShow->type])(pShow->pIter);
+    }
   }
 
   mDebug("%p, show is destroyed, data:%p index:%d", pShow, data, pShow->index);

src/tsdb/src/tsdbFS.c

@@ -37,8 +37,6 @@ static void tsdbScanAndTryFixDFilesHeader(STsdbRepo *pRepo, int32_t *nExpired);
 static int  tsdbProcessExpiredFS(STsdbRepo *pRepo);
 static int  tsdbCreateMeta(STsdbRepo *pRepo);
 
-// For backward compatibility
-bool tsdbForceKeepFile = false;
 // ================== CURRENT file header info
 static int tsdbEncodeFSHeader(void **buf, SFSHeader *pHeader) {
   int tlen = 0;

src/util/inc/tconfig.h

@@ -81,7 +81,6 @@ typedef struct {
 extern SGlobalCfg tsGlobalConfig[];
 extern int32_t    tsGlobalConfigNum;
 extern char *     tsCfgStatusStr[];
-extern bool       tsdbForceKeepFile;
 
 void taosReadGlobalLogCfg();
 bool taosReadGlobalCfg();