diff --git a/include/libs/catalog/catalog.h b/include/libs/catalog/catalog.h
index ee626865fb85e3da5d799cb67a62ac3bc94d1ee0..68eae03f518441aad3aeb17837045cb66b34a92d 100644
--- a/include/libs/catalog/catalog.h
+++ b/include/libs/catalog/catalog.h
@@ -137,7 +137,7 @@ int32_t catalogGetTableHashVgroup(struct SCatalog* pCatalog, void *pRpc, const S
 int32_t catalogGetAllMeta(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMgmtEps, const SCatalogReq* pReq, SMetaData* pRsp);
 
 
-int32_t catalogGetQnodeList(struct SCatalog* pCatalog, const SEpSet* pMgmtEps, SEpSet* pQnodeEpSet);
+int32_t catalogGetQnodeList(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMgmtEps, SEpSet* pQnodeEpSet);
 
 
 
diff --git a/include/libs/scheduler/scheduler.h b/include/libs/scheduler/scheduler.h
index 10eba7f49cbfda363e442b555c083272278723c1..c5002e1b366e17bbbea6deebe87ff726e98e91bc 100644
--- a/include/libs/scheduler/scheduler.h
+++ b/include/libs/scheduler/scheduler.h
@@ -23,7 +23,7 @@ extern "C" {
 #include "planner.h"
 
 typedef struct SSchedulerCfg {
-
+  int32_t clusterType;
 } SSchedulerCfg;
 
 typedef struct SQueryProfileSummary {
@@ -55,7 +55,7 @@ typedef struct SQueryProfileSummary {
  * @param pJob
  * @return
  */
-int32_t scheduleQueryJob(void *pRpc, SQueryDag* pDag, void** pJob);
+int32_t scheduleQueryJob(struct SCatalog *pCatalog, void *pRpc, const SEpSet* pMgmtEps, SQueryDag* pDag, void** pJob);
 
 int32_t scheduleFetchRows(void *pRpc, void *pJob, void *data);
 
diff --git a/source/libs/catalog/src/catalog.c b/source/libs/catalog/src/catalog.c
index 32cedb82b0ca834ead0822c0340919b508fe2d88..47731dde774c63e73734ff4cd842e2005f492308 100644
--- a/source/libs/catalog/src/catalog.c
+++ b/source/libs/catalog/src/catalog.c
@@ -634,6 +634,18 @@ _return:
   CTG_RET(code);
 }
 
+int32_t catalogGetQnodeList(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMgmtEps, SEpSet* pQnodeEpSet) {
+  if (NULL == pCatalog || NULL == pRpc  || NULL == pMgmtEps || NULL == pQnodeEpSet) {
+    CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
+  }
+
+  pQnodeEpSet->inUse = 0;
+  pQnodeEpSet->numOfEps = 0;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+
 void catalogDestroy(void) {
   if (ctgMgmt.pCluster) {
     taosHashCleanup(ctgMgmt.pCluster); //TBD
diff --git a/source/libs/scheduler/inc/schedulerInt.h b/source/libs/scheduler/inc/schedulerInt.h
index a08ccda54b816c88a26bd94bc2757ef1681eebbf..c5ab74a85f132b07248f99a05e0e5196e002cfc0 100644
--- a/source/libs/scheduler/inc/schedulerInt.h
+++ b/source/libs/scheduler/inc/schedulerInt.h
@@ -29,6 +29,8 @@ extern "C" {
 #define SCHEDULE_DEFAULT_JOB_NUMBER 1000
 #define SCHEDULE_DEFAULT_TASK_NUMBER 1000
 
+#define SCHEDULE_MAX_CONDIDATE_EP_NUM 3
+
 enum {
   SCH_STATUS_NOT_START = 1,
   SCH_STATUS_EXECUTING,
@@ -40,6 +42,7 @@ enum {
 
 typedef struct SSchedulerMgmt {
   uint64_t  taskId;
+  SSchedulerCfg cfg;
   SHashObj *Jobs;  // key: queryId, value: SQueryJob*
 } SSchedulerMgmt;
 
@@ -69,6 +72,10 @@ typedef struct SQueryJob {
   int32_t   levelIdx;
   int8_t    status;
   SQueryProfileSummary summary;
+  SEpSet    dataSrcEps;
+  struct SCatalog *catalog;
+  void            *rpc;
+  SEpSet          *mgmtEpSet;
 
   SHashObj *execTasks; // executing tasks, key:taskid, value:SQueryTask*
   SHashObj *succTasks; // succeed tasks, key:taskid, value:SQueryTask*
@@ -78,7 +85,7 @@ typedef struct SQueryJob {
 } SQueryJob;
 
 #define SCH_TASK_READY_TO_LUNCH(task) ((task)->childReady >= taosArrayGetSize((task)->children))   // MAY NEED TO ENHANCE
-
+#define SCH_IS_DATA_SRC_TASK(task) (task->plan->type == QUERY_TYPE_SCAN)
 
 #define SCH_JOB_ERR_LOG(param, ...) qError("QID:%"PRIx64 param, job->queryId, __VA_ARGS__)
 #define SCH_TASK_ERR_LOG(param, ...) qError("QID:%"PRIx64",TID:%"PRIx64 param, job->queryId, task->taskId, __VA_ARGS__)
diff --git a/source/libs/scheduler/src/scheduler.c b/source/libs/scheduler/src/scheduler.c
index 37d5b617d558a778e1739b6b97bd97baf6849f8f..396930dc5548d401d6d2aae98638015ef35847bc 100644
--- a/source/libs/scheduler/src/scheduler.c
+++ b/source/libs/scheduler/src/scheduler.c
@@ -16,6 +16,7 @@
 #include "schedulerInt.h"
 #include "taosmsg.h"
 #include "query.h"
+#include "catalog.h"
 
 SSchedulerMgmt schMgmt = {0};
 
@@ -223,8 +224,16 @@ _return:
   SCH_RET(code);
 }
 
-int32_t schAvailableEpSet(SEpSet *epSet) {
+int32_t schAvailableEpSet(SQueryJob *job, SEpSet *epSet) {
+  SCH_ERR_RET(catalogGetQnodeList(job->catalog, job->rpc, job->mgmtEpSet, epSet));
 
+  if (epSet->numOfEps > SCHEDULE_MAX_CONDIDATE_EP_NUM) {
+    return TSDB_CODE_SUCCESS;
+  }
+
+  //TODO COPY dataSrcEps TO epSet
+
+  return TSDB_CODE_SUCCESS;
 }
 
 
@@ -267,6 +276,13 @@ int32_t schProcessOnTaskSuccess(SQueryJob *job, SQueryTask *task) {
     return TSDB_CODE_SUCCESS;
   }
 
+  if (SCH_IS_DATA_SRC_TASK(task) && job->dataSrcEps.numOfEps < SCHEDULE_MAX_CONDIDATE_EP_NUM) {
+    strncpy(job->dataSrcEps.fqdn[job->dataSrcEps.numOfEps], task->execAddr.fqdn, sizeof(task->execAddr.fqdn));
+    job->dataSrcEps.port[job->dataSrcEps.numOfEps] = task->execAddr.port;
+
+    ++job->dataSrcEps.numOfEps;
+  }
+
   for (int32_t i = 0; i < parentNum; ++i) {
     SQueryTask *par = taosArrayGet(task->parents, i);
 
@@ -335,7 +351,7 @@ int32_t schTaskRun(SQueryJob *job, SQueryTask *task) {
   
   SCH_ERR_RET(qSubPlanToString(plan, &task->msg));
   if (plan->execEpSet.numOfEps <= 0) {
-    SCH_ERR_RET(schAvailableEpSet(&plan->execEpSet));
+    SCH_ERR_RET(schAvailableEpSet(job, &plan->execEpSet));
   }
   
   SCH_ERR_RET(schAsyncLaunchTask(job, task));
@@ -362,12 +378,16 @@ int32_t schedulerInit(SSchedulerCfg *cfg) {
     SCH_ERR_LRET(TSDB_CODE_QRY_OUT_OF_MEMORY, "init %d schduler jobs failed", SCHEDULE_DEFAULT_JOB_NUMBER);
   }
 
+  if (cfg) {
+    schMgmt.cfg = *cfg;
+  }
+
   return TSDB_CODE_SUCCESS;
 }
 
 
-int32_t scheduleQueryJob(void *pRpc, SQueryDag* pDag, void** pJob) {
-  if (NULL == pDag || NULL == pDag->pSubplans || NULL == pJob) {
+int32_t scheduleQueryJob(struct SCatalog *pCatalog, void *pRpc, const SEpSet* pMgmtEps, SQueryDag* pDag, void** pJob) {
+  if (NULL == pCatalog || NULL == pRpc || NULL == pMgmtEps || NULL == pDag || NULL == pDag->pSubplans || NULL == pJob) {
     SCH_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
   }
 
@@ -377,6 +397,10 @@ int32_t scheduleQueryJob(void *pRpc, SQueryDag* pDag, void** pJob) {
     SCH_ERR_RET(TSDB_CODE_QRY_OUT_OF_MEMORY);
   }
 
+  job->catalog = pCatalog;
+  job->rpc = pRpc;
+  job->mgmtEpSet = pMgmtEps;
+
   SCH_ERR_JRET(schValidateAndBuildJob(pDag, job));
 
   job->execTasks = taosHashInit(pDag->numOfSubplans, taosGetDefaultHashFunction(TSDB_DATA_TYPE_UBIGINT), false, HASH_ENTRY_LOCK);