#4829

Committed 30 Oct 2025 09:25AM UTC coverage: 49.734% (-11.3%) from 61.071%

Build # #4829

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travis-ci

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Commit Message

Merge pull request #33435 from taosdata/3.0

merge 3.0

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43.93

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

/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#define _DEFAULT_SOURCE
#include "audit.h"
#include "mndDnode.h"
#include "mndPrivilege.h"
#include "mndQnode.h"
#include "mndShow.h"
#include "mndTrans.h"
#include "mndUser.h"

#define QNODE_VER_NUMBER   1
#define QNODE_RESERVE_SIZE 64

static SSdbRaw *mndQnodeActionEncode(SQnodeObj *pObj);
static SSdbRow *mndQnodeActionDecode(SSdbRaw *pRaw);
static int32_t  mndQnodeActionInsert(SSdb *pSdb, SQnodeObj *pObj);
static int32_t  mndQnodeActionUpdate(SSdb *pSdb, SQnodeObj *pOld, SQnodeObj *pNew);
static int32_t  mndQnodeActionDelete(SSdb *pSdb, SQnodeObj *pObj);
static int32_t  mndProcessCreateQnodeReq(SRpcMsg *pReq);
static int32_t  mndProcessDropQnodeReq(SRpcMsg *pReq);
static int32_t  mndProcessQnodeListReq(SRpcMsg *pReq);
static int32_t  mndRetrieveQnodes(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *pBlock, int32_t rows);
static void     mndCancelGetNextQnode(SMnode *pMnode, void *pIter);

int32_t mndInitQnode(SMnode *pMnode) {
  SSdbTable table = {
      .sdbType = SDB_QNODE,
      .keyType = SDB_KEY_INT32,
      .encodeFp = (SdbEncodeFp)mndQnodeActionEncode,
      .decodeFp = (SdbDecodeFp)mndQnodeActionDecode,
      .insertFp = (SdbInsertFp)mndQnodeActionInsert,
      .updateFp = (SdbUpdateFp)mndQnodeActionUpdate,
      .deleteFp = (SdbDeleteFp)mndQnodeActionDelete,
  };

  mndSetMsgHandle(pMnode, TDMT_MND_CREATE_QNODE, mndProcessCreateQnodeReq);
  mndSetMsgHandle(pMnode, TDMT_MND_DROP_QNODE, mndProcessDropQnodeReq);
  mndSetMsgHandle(pMnode, TDMT_DND_CREATE_QNODE_RSP, mndTransProcessRsp);
  mndSetMsgHandle(pMnode, TDMT_DND_DROP_QNODE_RSP, mndTransProcessRsp);
  mndSetMsgHandle(pMnode, TDMT_MND_QNODE_LIST, mndProcessQnodeListReq);

  mndAddShowRetrieveHandle(pMnode, TSDB_MGMT_TABLE_QNODE, mndRetrieveQnodes);
  mndAddShowFreeIterHandle(pMnode, TSDB_MGMT_TABLE_QNODE, mndCancelGetNextQnode);

  return sdbSetTable(pMnode->pSdb, table);
}

void mndCleanupQnode(SMnode *pMnode) {}

SQnodeObj *mndAcquireQnode(SMnode *pMnode, int32_t qnodeId) {
  SQnodeObj *pObj = sdbAcquire(pMnode->pSdb, SDB_QNODE, &qnodeId);
  if (pObj == NULL && terrno == TSDB_CODE_SDB_OBJ_NOT_THERE) {
    terrno = TSDB_CODE_MND_QNODE_NOT_EXIST;
  }
  return pObj;
}

void mndReleaseQnode(SMnode *pMnode, SQnodeObj *pObj) {
  SSdb *pSdb = pMnode->pSdb;
  sdbRelease(pSdb, pObj);
}

static SSdbRaw *mndQnodeActionEncode(SQnodeObj *pObj) {
  int32_t code = 0;
  int32_t lino = 0;
  terrno = TSDB_CODE_OUT_OF_MEMORY;

  SSdbRaw *pRaw = sdbAllocRaw(SDB_QNODE, QNODE_VER_NUMBER, sizeof(SQnodeObj) + QNODE_RESERVE_SIZE);
  if (pRaw == NULL) goto _OVER;

  int32_t dataPos = 0;
  SDB_SET_INT32(pRaw, dataPos, pObj->id, _OVER)
  SDB_SET_INT64(pRaw, dataPos, pObj->createdTime, _OVER)
  SDB_SET_INT64(pRaw, dataPos, pObj->updateTime, _OVER)
  SDB_SET_RESERVE(pRaw, dataPos, QNODE_RESERVE_SIZE, _OVER)

  terrno = 0;

_OVER:
  if (terrno != 0) {
    mError("qnode:%d, failed to encode to raw:%p since %s", pObj->id, pRaw, terrstr());
    sdbFreeRaw(pRaw);
    return NULL;
  }

  mTrace("qnode:%d, encode to raw:%p, row:%p", pObj->id, pRaw, pObj);
  return pRaw;
}

static SSdbRow *mndQnodeActionDecode(SSdbRaw *pRaw) {
  int32_t code = 0;
  int32_t lino = 0;
  terrno = TSDB_CODE_OUT_OF_MEMORY;
  SSdbRow   *pRow = NULL;
  SQnodeObj *pObj = NULL;

  int8_t sver = 0;
  if (sdbGetRawSoftVer(pRaw, &sver) != 0) goto _OVER;

  if (sver != QNODE_VER_NUMBER) {
    terrno = TSDB_CODE_SDB_INVALID_DATA_VER;
    goto _OVER;
  }

  pRow = sdbAllocRow(sizeof(SQnodeObj));
  if (pRow == NULL) goto _OVER;

  pObj = sdbGetRowObj(pRow);
  if (pObj == NULL) goto _OVER;

  int32_t dataPos = 0;
  SDB_GET_INT32(pRaw, dataPos, &pObj->id, _OVER)
  SDB_GET_INT64(pRaw, dataPos, &pObj->createdTime, _OVER)
  SDB_GET_INT64(pRaw, dataPos, &pObj->updateTime, _OVER)
  SDB_GET_RESERVE(pRaw, dataPos, QNODE_RESERVE_SIZE, _OVER)

  terrno = 0;

_OVER:
  if (terrno != 0) {
    mError("qnode:%d, failed to decode from raw:%p since %s", pObj == NULL ? 0 : pObj->id, pRaw, terrstr());
    taosMemoryFreeClear(pRow);
    return NULL;
  }

  mTrace("qnode:%d, decode from raw:%p, row:%p", pObj->id, pRaw, pObj);
  return pRow;
}

static int32_t mndQnodeActionInsert(SSdb *pSdb, SQnodeObj *pObj) {
  int32_t code = 0;
  mTrace("qnode:%d, perform insert action, row:%p", pObj->id, pObj);
  pObj->pDnode = sdbAcquire(pSdb, SDB_DNODE, &pObj->id);
  if (pObj->pDnode == NULL) {
    code = TSDB_CODE_MND_DNODE_NOT_EXIST;
    mError("qnode:%d, failed to perform insert action since %s", pObj->id, terrstr());
    TAOS_RETURN(code);
  }

  TAOS_RETURN(code);
}

static int32_t mndQnodeActionDelete(SSdb *pSdb, SQnodeObj *pObj) {
  mTrace("qnode:%d, perform delete action, row:%p", pObj->id, pObj);
  if (pObj->pDnode != NULL) {
    sdbRelease(pSdb, pObj->pDnode);
    pObj->pDnode = NULL;
  }

  return 0;
}

static int32_t mndQnodeActionUpdate(SSdb *pSdb, SQnodeObj *pOld, SQnodeObj *pNew) {
  mTrace("qnode:%d, perform update action, old row:%p new row:%p", pOld->id, pOld, pNew);
  pOld->updateTime = pNew->updateTime;
  return 0;
}

static int32_t mndSetCreateQnodeRedoLogs(STrans *pTrans, SQnodeObj *pObj) {
  int32_t  code = 0;
  SSdbRaw *pRedoRaw = mndQnodeActionEncode(pObj);
  if (pRedoRaw == NULL) {
    code = TSDB_CODE_MND_RETURN_VALUE_NULL;
    if (terrno != 0) code = terrno;
    TAOS_RETURN(code);
  }
  TAOS_CHECK_RETURN(mndTransAppendRedolog(pTrans, pRedoRaw));
  TAOS_CHECK_RETURN(sdbSetRawStatus(pRedoRaw, SDB_STATUS_CREATING));
  TAOS_RETURN(code);
}

static int32_t mndSetCreateQnodeUndoLogs(STrans *pTrans, SQnodeObj *pObj) {
  int32_t  code = 0;
  SSdbRaw *pUndoRaw = mndQnodeActionEncode(pObj);
  if (pUndoRaw == NULL) {
    code = TSDB_CODE_MND_RETURN_VALUE_NULL;
    if (terrno != 0) code = terrno;
    TAOS_RETURN(code);
  }
  TAOS_CHECK_RETURN(mndTransAppendUndolog(pTrans, pUndoRaw));
  TAOS_CHECK_RETURN(sdbSetRawStatus(pUndoRaw, SDB_STATUS_DROPPED));
  TAOS_RETURN(code);
}

int32_t mndSetCreateQnodeCommitLogs(STrans *pTrans, SQnodeObj *pObj) {
  int32_t  code = 0;
  SSdbRaw *pCommitRaw = mndQnodeActionEncode(pObj);
  if (pCommitRaw == NULL) {
    code = TSDB_CODE_MND_RETURN_VALUE_NULL;
    if (terrno != 0) code = terrno;
    TAOS_RETURN(code);
  }
  TAOS_CHECK_RETURN(mndTransAppendCommitlog(pTrans, pCommitRaw));
  TAOS_CHECK_RETURN(sdbSetRawStatus(pCommitRaw, SDB_STATUS_READY));
  TAOS_RETURN(code);
}

bool mndQnodeInDnode(SQnodeObj *pQnode, int32_t dnodeId) { return pQnode->pDnode->id == dnodeId; }

int32_t mndSetCreateQnodeRedoActions(STrans *pTrans, SDnodeObj *pDnode, SQnodeObj *pObj) {
  int32_t          code = 0;
  SDCreateQnodeReq createReq = {0};
  createReq.dnodeId = pDnode->id;

  int32_t contLen = tSerializeSCreateDropMQSNodeReq(NULL, 0, &createReq);
  void   *pReq = taosMemoryMalloc(contLen);
  if (pReq == NULL) {
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    return -1;
  }
  code = tSerializeSCreateDropMQSNodeReq(pReq, contLen, &createReq);
  if (code < 0) {
    mError("qnode:%d, failed to serialize create drop qnode request since %s", createReq.dnodeId, terrstr());
  }
  STransAction action = {0};
  action.epSet = mndGetDnodeEpset(pDnode);
  action.pCont = pReq;
  action.contLen = contLen;
  action.msgType = TDMT_DND_CREATE_QNODE;
  action.acceptableCode = TSDB_CODE_QNODE_ALREADY_DEPLOYED;
  action.groupId = -1;

  if ((code = mndTransAppendRedoAction(pTrans, &action)) != 0) {
    taosMemoryFree(pReq);
    TAOS_RETURN(code);
  }

  TAOS_RETURN(code);
}

static int32_t mndSetCreateQnodeUndoActions(STrans *pTrans, SDnodeObj *pDnode, SQnodeObj *pObj) {
  int32_t        code = 0;
  SDDropQnodeReq dropReq = {0};
  dropReq.dnodeId = pDnode->id;

  int32_t contLen = tSerializeSCreateDropMQSNodeReq(NULL, 0, &dropReq);
  void   *pReq = taosMemoryMalloc(contLen);
  if (pReq == NULL) {
    code = terrno;
    TAOS_RETURN(code);
  }
  code = tSerializeSCreateDropMQSNodeReq(pReq, contLen, &dropReq);
  if (code < 0) {
    mError("qnode:%d, failed to serialize create drop qnode request since %s", dropReq.dnodeId, terrstr());
  }

  STransAction action = {0};
  action.epSet = mndGetDnodeEpset(pDnode);
  action.pCont = pReq;
  action.contLen = contLen;
  action.msgType = TDMT_DND_DROP_QNODE;
  action.acceptableCode = TSDB_CODE_QNODE_NOT_DEPLOYED;

  if ((code = mndTransAppendUndoAction(pTrans, &action)) != 0) {
    taosMemoryFree(pReq);
    TAOS_RETURN(code);
  }

  TAOS_RETURN(code);
}

static int32_t mndCreateQnode(SMnode *pMnode, SRpcMsg *pReq, SDnodeObj *pDnode, SMCreateQnodeReq *pCreate) {
  int32_t code = -1;

  SQnodeObj qnodeObj = {0};
  qnodeObj.id = pDnode->id;
  qnodeObj.createdTime = taosGetTimestampMs();
  qnodeObj.updateTime = qnodeObj.createdTime;

  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_CONFLICT_NOTHING, pReq, "create-qnode");
  if (pTrans == NULL) {
    code = TSDB_CODE_MND_RETURN_VALUE_NULL;
    if (terrno != 0) code = terrno;
    goto _OVER;
  }
  mndTransSetSerial(pTrans);

  mInfo("trans:%d, used to create qnode:%d", pTrans->id, pCreate->dnodeId);
  TAOS_CHECK_GOTO(mndSetCreateQnodeRedoLogs(pTrans, &qnodeObj), NULL, _OVER);
  TAOS_CHECK_GOTO(mndSetCreateQnodeUndoLogs(pTrans, &qnodeObj), NULL, _OVER);
  TAOS_CHECK_GOTO(mndSetCreateQnodeCommitLogs(pTrans, &qnodeObj), NULL, _OVER);
  TAOS_CHECK_GOTO(mndSetCreateQnodeRedoActions(pTrans, pDnode, &qnodeObj), NULL, _OVER);
  TAOS_CHECK_GOTO(mndSetCreateQnodeUndoActions(pTrans, pDnode, &qnodeObj), NULL, _OVER);
  TAOS_CHECK_GOTO(mndTransPrepare(pMnode, pTrans), NULL, _OVER);

  code = 0;

_OVER:
  mndTransDrop(pTrans);
  TAOS_RETURN(code);
}

static int32_t mndProcessCreateQnodeReq(SRpcMsg *pReq) {
  SMnode          *pMnode = pReq->info.node;
  int32_t          code = -1;
  SQnodeObj       *pObj = NULL;
  SDnodeObj       *pDnode = NULL;
  SMCreateQnodeReq createReq = {0};

  TAOS_CHECK_GOTO(tDeserializeSCreateDropMQSNodeReq(pReq->pCont, pReq->contLen, &createReq), NULL, _OVER);

  mInfo("qnode:%d, start to create", createReq.dnodeId);
  TAOS_CHECK_GOTO(mndCheckOperPrivilege(pMnode, pReq->info.conn.user, MND_OPER_CREATE_QNODE), NULL, _OVER);

  pObj = mndAcquireQnode(pMnode, createReq.dnodeId);
  if (pObj != NULL) {
    code = TSDB_CODE_MND_QNODE_ALREADY_EXIST;
    goto _OVER;
  } else if (terrno != TSDB_CODE_MND_QNODE_NOT_EXIST) {
    goto _OVER;
  }

  pDnode = mndAcquireDnode(pMnode, createReq.dnodeId);
  if (pDnode == NULL) {
    code = TSDB_CODE_MND_DNODE_NOT_EXIST;
    goto _OVER;
  }

  code = mndCreateQnode(pMnode, pReq, pDnode, &createReq);
  if (code == 0) code = TSDB_CODE_ACTION_IN_PROGRESS;

  char obj[33] = {0};
  (void)tsnprintf(obj, sizeof(obj), "%d", createReq.dnodeId);

  auditRecord(pReq, pMnode->clusterId, "createQnode", "", obj, createReq.sql, createReq.sqlLen);
_OVER:
  if (code != 0 && code != TSDB_CODE_ACTION_IN_PROGRESS) {
    mError("qnode:%d, failed to create since %s", createReq.dnodeId, terrstr());
  }

  mndReleaseQnode(pMnode, pObj);
  mndReleaseDnode(pMnode, pDnode);
  tFreeSMCreateQnodeReq(&createReq);
  TAOS_RETURN(code);
}

static int32_t mndSetDropQnodeRedoLogs(STrans *pTrans, SQnodeObj *pObj) {
  int32_t  code = 0;
  SSdbRaw *pRedoRaw = mndQnodeActionEncode(pObj);
  if (pRedoRaw == NULL) {
    code = TSDB_CODE_MND_RETURN_VALUE_NULL;
    if (terrno != 0) code = terrno;
    TAOS_RETURN(code);
  }
  TAOS_CHECK_RETURN(mndTransAppendGroupRedolog(pTrans, pRedoRaw, -1));
  TAOS_CHECK_RETURN(sdbSetRawStatus(pRedoRaw, SDB_STATUS_DROPPING));
  TAOS_RETURN(code);
}

static int32_t mndSetDropQnodeCommitLogs(STrans *pTrans, SQnodeObj *pObj) {
  int32_t  code = 0;
  SSdbRaw *pCommitRaw = mndQnodeActionEncode(pObj);
  if (pCommitRaw == NULL) {
    code = TSDB_CODE_MND_RETURN_VALUE_NULL;
    if (terrno != 0) code = terrno;
    TAOS_RETURN(code);
  }
  if (mndTransAppendCommitlog(pTrans, pCommitRaw))
    ;
  if (sdbSetRawStatus(pCommitRaw, SDB_STATUS_DROPPED))
    ;
  TAOS_RETURN(code);
}

static int32_t mndSetDropQnodeRedoActions(STrans *pTrans, SDnodeObj *pDnode, SQnodeObj *pObj) {
  int32_t        code = 0;
  SDDropQnodeReq dropReq = {0};
  dropReq.dnodeId = pDnode->id;

  int32_t contLen = tSerializeSCreateDropMQSNodeReq(NULL, 0, &dropReq);
  void   *pReq = taosMemoryMalloc(contLen);
  if (pReq == NULL) {
    code = terrno;
    TAOS_RETURN(code);
  }
  code = tSerializeSCreateDropMQSNodeReq(pReq, contLen, &dropReq);
  if (code < 0) {
    mError("qnode:%d, failed to serialize create drop qnode request since %s", dropReq.dnodeId, terrstr());
  }

  STransAction action = {0};
  action.epSet = mndGetDnodeEpset(pDnode);
  action.pCont = pReq;
  action.contLen = contLen;
  action.msgType = TDMT_DND_DROP_QNODE;
  action.acceptableCode = TSDB_CODE_QNODE_NOT_DEPLOYED;
  action.groupId = -1;

  if ((code = mndTransAppendRedoAction(pTrans, &action)) != 0) {
    taosMemoryFree(pReq);
    TAOS_RETURN(code);
  }

  TAOS_RETURN(code);
}

int32_t mndSetDropQnodeInfoToTrans(SMnode *pMnode, STrans *pTrans, SQnodeObj *pObj, bool force) {
  if (pObj == NULL) return 0;
  TAOS_CHECK_RETURN(mndSetDropQnodeRedoLogs(pTrans, pObj));
  TAOS_CHECK_RETURN(mndSetDropQnodeCommitLogs(pTrans, pObj));
  if (!force) {
    TAOS_CHECK_RETURN(mndSetDropQnodeRedoActions(pTrans, pObj->pDnode, pObj));
  }
  return 0;
}

static int32_t mndDropQnode(SMnode *pMnode, SRpcMsg *pReq, SQnodeObj *pObj) {
  int32_t code = -1;

  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_RETRY, TRN_CONFLICT_NOTHING, pReq, "drop-qnode");
  if (pTrans == NULL) {
    code = TSDB_CODE_MND_RETURN_VALUE_NULL;
    if (terrno != 0) code = terrno;
    goto _OVER;
  }
  mndTransSetSerial(pTrans);

  mInfo("trans:%d, used to drop qnode:%d", pTrans->id, pObj->id);
  TAOS_CHECK_GOTO(mndSetDropQnodeInfoToTrans(pMnode, pTrans, pObj, false), NULL, _OVER);
  TAOS_CHECK_GOTO(mndTransPrepare(pMnode, pTrans), NULL, _OVER);

  code = 0;

_OVER:
  mndTransDrop(pTrans);
  TAOS_RETURN(code);
}

static int32_t mndProcessDropQnodeReq(SRpcMsg *pReq) {
  SMnode        *pMnode = pReq->info.node;
  int32_t        code = -1;
  SQnodeObj     *pObj = NULL;
  SMDropQnodeReq dropReq = {0};

  TAOS_CHECK_GOTO(tDeserializeSCreateDropMQSNodeReq(pReq->pCont, pReq->contLen, &dropReq), NULL, _OVER);

  mInfo("qnode:%d, start to drop", dropReq.dnodeId);
  TAOS_CHECK_GOTO(mndCheckOperPrivilege(pMnode, pReq->info.conn.user, MND_OPER_DROP_QNODE), NULL, _OVER);

  if (dropReq.dnodeId <= 0) {
    code = TSDB_CODE_INVALID_MSG;
    goto _OVER;
  }

  pObj = mndAcquireQnode(pMnode, dropReq.dnodeId);
  if (pObj == NULL) {
    code = TSDB_CODE_MND_RETURN_VALUE_NULL;
    if (terrno != 0) code = terrno;
    goto _OVER;
  }

  code = mndDropQnode(pMnode, pReq, pObj);
  if (code == 0) code = TSDB_CODE_ACTION_IN_PROGRESS;

  char obj[33] = {0};
  (void)tsnprintf(obj, sizeof(obj), "%d", dropReq.dnodeId);

  auditRecord(pReq, pMnode->clusterId, "dropQnode", "", obj, dropReq.sql, dropReq.sqlLen);

_OVER:
  if (code != 0 && code != TSDB_CODE_ACTION_IN_PROGRESS) {
    mError("qnode:%d, failed to drop since %s", dropReq.dnodeId, terrstr());
  }

  mndReleaseQnode(pMnode, pObj);
  tFreeSDDropQnodeReq(&dropReq);
  TAOS_RETURN(code);
}

int32_t mndCreateQnodeList(SMnode *pMnode, SArray **pList, int32_t limit) {
  int32_t    code = 0;
  SSdb      *pSdb = pMnode->pSdb;
  void      *pIter = NULL;
  SQnodeObj *pObj = NULL;
  int32_t    numOfRows = 0;

  SArray *qnodeList = taosArrayInit(5, sizeof(SQueryNodeLoad));
  if (NULL == qnodeList) {
    mError("failed to alloc epSet while process qnode list req");
    code = terrno;
    TAOS_RETURN(code);
  }

  while (1) {
    pIter = sdbFetch(pSdb, SDB_QNODE, pIter, (void **)&pObj);
    if (pIter == NULL) break;

    SQueryNodeLoad nodeLoad = {0};
    nodeLoad.addr.nodeId = QNODE_HANDLE;
    nodeLoad.addr.epSet.numOfEps = 1;
    tstrncpy(nodeLoad.addr.epSet.eps[0].fqdn, pObj->pDnode->fqdn, TSDB_FQDN_LEN);
    nodeLoad.addr.epSet.eps[0].port = pObj->pDnode->port;
    nodeLoad.load = QNODE_LOAD_VALUE(pObj);

    if (taosArrayPush(qnodeList, &nodeLoad) == NULL) {
      sdbRelease(pSdb, pObj);
      sdbCancelFetch(pSdb, pIter);
      if (terrno != 0) code = terrno;
      return code;
    }

    numOfRows++;
    sdbRelease(pSdb, pObj);

    if (limit > 0 && numOfRows >= limit) {
      sdbCancelFetch(pSdb, pIter);
      break;
    }
  }

  *pList = qnodeList;

  return TSDB_CODE_SUCCESS;
}

static int32_t mndProcessQnodeListReq(SRpcMsg *pReq) {
  int32_t       code = -1;
  SMnode       *pMnode = pReq->info.node;
  SQnodeListReq qlistReq = {0};
  SQnodeListRsp qlistRsp = {0};

  TAOS_CHECK_GOTO(tDeserializeSQnodeListReq(pReq->pCont, pReq->contLen, &qlistReq), NULL, _OVER);

  TAOS_CHECK_GOTO(mndCreateQnodeList(pMnode, &qlistRsp.qnodeList, qlistReq.rowNum), NULL, _OVER);

  int32_t rspLen = tSerializeSQnodeListRsp(NULL, 0, &qlistRsp);
  void   *pRsp = rpcMallocCont(rspLen);
  if (pRsp == NULL) {
    code = terrno;
    goto _OVER;
  }

  code = tSerializeSQnodeListRsp(pRsp, rspLen, &qlistRsp);
  if (code < 0) {
    mError("failed to serialize qnode list response since %s", terrstr());
  }

  pReq->info.rspLen = rspLen;
  pReq->info.rsp = pRsp;
  code = 0;

_OVER:
  tFreeSQnodeListRsp(&qlistRsp);
  TAOS_RETURN(code);
}

static int32_t mndRetrieveQnodes(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *pBlock, int32_t rows) {
  SMnode    *pMnode = pReq->info.node;
  SSdb      *pSdb = pMnode->pSdb;
  int32_t    numOfRows = 0;
  int32_t    cols = 0;
  SQnodeObj *pObj = NULL;
  char      *pWrite;

  while (numOfRows < rows) {
    pShow->pIter = sdbFetch(pSdb, SDB_QNODE, pShow->pIter, (void **)&pObj);
    if (pShow->pIter == NULL) break;

    cols = 0;
    SColumnInfoData *pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    TAOS_CHECK_RETURN_WITH_RELEASE(colDataSetVal(pColInfo, numOfRows, (const char *)&pObj->id, false), pSdb, pObj);

    char ep[TSDB_EP_LEN + VARSTR_HEADER_SIZE] = {0};
    STR_WITH_MAXSIZE_TO_VARSTR(ep, pObj->pDnode->ep, pShow->pMeta->pSchemas[cols].bytes);
    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    TAOS_CHECK_RETURN_WITH_RELEASE(colDataSetVal(pColInfo, numOfRows, (const char *)ep, false), pSdb, pObj);

    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    TAOS_CHECK_RETURN_WITH_RELEASE(colDataSetVal(pColInfo, numOfRows, (const char *)&pObj->createdTime, false), pSdb,
                                   pObj);

    numOfRows++;
    sdbRelease(pSdb, pObj);
  }

  pShow->numOfRows += numOfRows;

  return numOfRows;
}

static void mndCancelGetNextQnode(SMnode *pMnode, void *pIter) {
  SSdb *pSdb = pMnode->pSdb;
  sdbCancelFetchByType(pSdb, pIter, SDB_QNODE);
}

taosdata / TDengine / #4829

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