diff --git a/include/common/taosmsg.h b/include/common/taosmsg.h
index 8229cae281af36b186da5238da0b36804de45c98..a8281d95a5e5b07cd8958457f53efc8f8ec96e1b 100644
--- a/include/common/taosmsg.h
+++ b/include/common/taosmsg.h
@@ -51,7 +51,7 @@ TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_MQ_QUERY, "mq-query" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_MQ_CONNECT, "mq-connect" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_MQ_DISCONNECT, "mq-disconnect" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_MQ_SET_CUR, "mq-set-cur" )
-TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_RSP_READY, "rsp-ready" )
+TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_RES_READY, "res-ready" )
 // message from client to mnode
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_CONNECT, "connect" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_CREATE_ACCT, "create-acct" )	
@@ -1094,6 +1094,7 @@ typedef struct {
 } SUpdateTagValRsp;
 
 typedef struct SSchedulerQueryMsg {
+  uint64_t  schedulerId;
   uint64_t  queryId;
   uint64_t  taskId;
   uint32_t  contentLen;
@@ -1101,15 +1102,39 @@ typedef struct SSchedulerQueryMsg {
 } SSchedulerQueryMsg;
 
 typedef struct SSchedulerReadyMsg {
+  uint64_t  schedulerId;
   uint64_t  queryId;
   uint64_t  taskId;
 } SSchedulerReadyMsg;
 
 typedef struct SSchedulerFetchMsg {
+  uint64_t  schedulerId;
   uint64_t  queryId;
   uint64_t  taskId;
 } SSchedulerFetchMsg;
 
+typedef struct SSchedulerStatusMsg {
+  uint64_t  schedulerId;
+} SSchedulerStatusMsg;
+
+typedef struct STaskStatus {
+  uint64_t  queryId;
+  uint64_t  taskId;
+  int8_t    status;
+} STaskStatus;
+
+typedef struct SSchedulerStatusRsp {
+  uint32_t    num;
+  STaskStatus status[];
+} SSchedulerStatusRsp;
+
+
+typedef struct SSchedulerCancelMsg {
+  uint64_t  schedulerId;
+  uint64_t  queryId;
+  uint64_t  taskId;
+} SSchedulerCancelMsg;
+
 
 #pragma pack(pop)
 
diff --git a/include/dnode/qnode/qnode.h b/include/dnode/qnode/qnode.h
index 65779b209938bc9766f2d0d11881c2354d0c5092..aa4c3af392dfb2e94198d0062801fe405624752c 100644
--- a/include/dnode/qnode/qnode.h
+++ b/include/dnode/qnode/qnode.h
@@ -19,7 +19,7 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-
+#include "trpc.h"
 
 typedef struct {
   uint64_t numOfStartTask;
@@ -32,48 +32,6 @@ typedef struct {
   uint64_t numOfErrors;
 } SQnodeStat;
 
-/* start Task msg */
-typedef struct {
-  uint32_t  schedulerIp;
-  uint16_t  schedulerPort;
-  int64_t   taskId;
-  int64_t   queryId;
-  uint32_t  srcIp;
-  uint16_t  srcPort;
-} SQnodeStartTaskMsg;
-
-/* stop Task msg */
-typedef struct {
-  int64_t   taskId;
-} SQnodeStopTaskMsg;
-
-/* start/stop Task msg response */
-typedef struct {
-  int64_t   taskId;
-  int32_t code;
-} SQnodeTaskRespMsg;
-
-/* Task status msg */
-typedef struct {
-  int64_t   taskId;
-  int32_t   status;
-  int64_t   queryId;
-} SQnodeTaskStatusMsg;
-
-/* Qnode/Scheduler heartbeat msg */
-typedef struct {
-  int32_t status;
-  int32_t load;
-  
-} SQnodeHeartbeatMsg;
-
-/* Qnode sent/received msg */
-typedef struct {
-  int8_t   msgType;
-  int32_t  msgLen;
-  char     msg[];
-} SQnodeMsg;
-
 
 /**
  * Start one Qnode in Dnode.
diff --git a/include/libs/qcom/query.h b/include/libs/qcom/query.h
index 254d572149b6c01a439cd9e23470ff90c5a65936..4fcbc1c5282a7bf7f1339381ed17be8399a76ad4 100644
--- a/include/libs/qcom/query.h
+++ b/include/libs/qcom/query.h
@@ -24,6 +24,15 @@ extern "C" {
 #include "thash.h"
 #include "tlog.h"
 
+enum {
+  JOB_TASK_STATUS_NOT_START = 1,
+  JOB_TASK_STATUS_EXECUTING,
+  JOB_TASK_STATUS_SUCCEED,
+  JOB_TASK_STATUS_FAILED,
+  JOB_TASK_STATUS_CANCELLING,
+  JOB_TASK_STATUS_CANCELLED
+};
+
 typedef struct STableComInfo {
   uint8_t numOfTags;      // the number of tags in schema
   uint8_t precision;      // the number of precision
diff --git a/include/libs/qworker/qworker.h b/include/libs/qworker/qworker.h
new file mode 100644
index 0000000000000000000000000000000000000000..63a6b6f89bee7100abd91426b979163a99cfd641
--- /dev/null
+++ b/include/libs/qworker/qworker.h
@@ -0,0 +1,62 @@
+/*
+ * 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/>.
+ */
+
+#ifndef _TD_QWORKER_H_
+#define _TD_QWORKER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "trpc.h"
+
+typedef struct SQWorkerCfg {
+  uint32_t maxSchedulerNum;
+  uint32_t maxResCacheNum;
+  uint32_t maxSchTaskNum;
+} SQWorkerCfg;
+
+typedef struct {
+  uint64_t numOfStartTask;
+  uint64_t numOfStopTask;
+  uint64_t numOfRecvedFetch;
+  uint64_t numOfSentHb;
+  uint64_t numOfSentFetch;
+  uint64_t numOfTaskInQueue;
+  uint64_t numOfFetchInQueue;
+  uint64_t numOfErrors;
+} SQWorkerStat;
+
+
+int32_t qWorkerInit(SQWorkerCfg *cfg, void **qWorkerMgmt);
+
+int32_t qWorkerProcessQueryMsg(void *qWorkerMgmt, SSchedulerQueryMsg *msg, SRpcMsg *rsp);
+
+int32_t qWorkerProcessReadyMsg(void *qWorkerMgmt, SSchedulerReadyMsg *msg, SRpcMsg *rsp);
+
+int32_t qWorkerProcessStatusMsg(void *qWorkerMgmt, SSchedulerStatusMsg *msg, SRpcMsg *rsp);
+
+int32_t qWorkerProcessFetchMsg(void *qWorkerMgmt, SSchedulerFetchMsg *msg, SRpcMsg *rsp);
+
+int32_t qWorkerProcessCancelMsg(void *qWorkerMgmt, SSchedulerCancelMsg *msg, SRpcMsg *rsp);
+
+void qWorkerDestroy(void **qWorkerMgmt);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TD_QWORKER_H_*/
diff --git a/include/libs/scheduler/scheduler.h b/include/libs/scheduler/scheduler.h
index 2cbf26f8772927f67c3a882465cd66414be20a93..975b10353871f269abecb70d4974836d3e4a44b2 100644
--- a/include/libs/scheduler/scheduler.h
+++ b/include/libs/scheduler/scheduler.h
@@ -25,6 +25,7 @@ extern "C" {
 
 typedef struct SSchedulerCfg {
   int32_t clusterType;
+  int32_t maxJobNum;
 } SSchedulerCfg;
 
 typedef struct SQueryProfileSummary {
diff --git a/include/util/thash.h b/include/util/thash.h
index d5038802c079f3ed3cddcef6c30c219459fc9917..ebdc91f0546a7ef9de3801f4eabf13f18c2cdf4c 100644
--- a/include/util/thash.h
+++ b/include/util/thash.h
@@ -193,11 +193,10 @@ void  taosHashCancelIterate(SHashObj *pHashObj, void *p);
 
 /**
  * Get the corresponding key information for a given data in hash table
- * @param pHashObj
  * @param data
  * @return
  */
-int32_t taosHashGetKey(SHashObj *pHashObj, void *data, void** key, size_t* keyLen);
+int32_t taosHashGetKey(void *data, void** key, size_t* keyLen);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/CMakeLists.txt b/source/libs/CMakeLists.txt
index 636cf0a9a84453458ec0d06b84231f926a4637b5..027532bbb1d1514604fc8277862e764cec13ec51 100644
--- a/source/libs/CMakeLists.txt
+++ b/source/libs/CMakeLists.txt
@@ -11,3 +11,4 @@ add_subdirectory(executor)
 add_subdirectory(planner)
 add_subdirectory(function)
 add_subdirectory(qcom)
+add_subdirectory(qworker)
diff --git a/source/libs/executor/src/tfilter.c b/source/libs/executor/src/tfilter.c
index 48662f34436d05c9c2ef873bb52d6e1aa515f4f3..97dccb5c7b69405f91934362262e339985a5060d 100644
--- a/source/libs/executor/src/tfilter.c
+++ b/source/libs/executor/src/tfilter.c
@@ -1175,7 +1175,7 @@ int32_t filterAddGroupUnitFromNode(SFilterInfo *info, tExprNode* tree, SArray *g
       void* key = NULL;
       len = 0;
 
-      taosHashGetKey((SHashObj *)data, p, &key, &len);
+      taosHashGetKey(p, &key, &len);
       void *fdata = NULL;
     
       if (IS_VAR_DATA_TYPE(type)) {
diff --git a/source/libs/qworker/CMakeLists.txt b/source/libs/qworker/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4eafa50bdc200615391cfc2f364fc9c9c20430bd
--- /dev/null
+++ b/source/libs/qworker/CMakeLists.txt
@@ -0,0 +1,12 @@
+aux_source_directory(src QWORKER_SRC)
+add_library(qworker ${QWORKER_SRC})
+target_include_directories(
+    qworker
+    PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/qworker"
+    PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/inc"
+)
+
+target_link_libraries(
+   qworker
+   PRIVATE os util transport planner qcom
+)
diff --git a/source/libs/qworker/inc/qworkerInt.h b/source/libs/qworker/inc/qworkerInt.h
new file mode 100644
index 0000000000000000000000000000000000000000..1adc09def41234a26d3557916eb40917e6e1b57e
--- /dev/null
+++ b/source/libs/qworker/inc/qworkerInt.h
@@ -0,0 +1,68 @@
+/*
+ * 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/>.
+ */
+
+#ifndef _TD_QWORKER_INT_H_
+#define _TD_QWORKER_INT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define QWORKER_DEFAULT_SCHEDULER_NUMBER 10000
+#define QWORKER_DEFAULT_RES_CACHE_NUMBER 10000
+#define QWORKER_DEFAULT_SCH_TASK_NUMBER 10000
+
+enum {
+  QW_READY_NOT_RECEIVED = 0,
+  QW_READY_RECEIVED,
+  QW_READY_RESPONSED,
+};
+
+typedef struct SQWorkerTaskStatus {
+  int8_t status;
+  int8_t ready; 
+} SQWorkerTaskStatus;
+
+typedef struct SQWorkerResCache {
+  void *data;
+} SQWorkerResCache;
+
+typedef struct SQWorkerSchTaskStatus {
+  int32_t   lastAccessTs; // timestamp in second
+  SHashObj *taskStatus;   // key:queryId+taskId, value: SQWorkerTaskStatus
+} SQWorkerSchTaskStatus;
+
+// Qnode/Vnode level task management
+typedef struct SQWorkerMgmt {
+  SQWorkerCfg cfg;
+  SHashObj *scheduleHash;    //key: schedulerId, value: SQWorkerSchTaskStatus
+  SHashObj *resHash;       //key: queryId+taskId, value: SQWorkerResCache
+} SQWorkerMgmt;
+
+#define QW_TASK_DONE(status) (status == JOB_TASK_STATUS_SUCCEED || status == JOB_TASK_STATUS_FAILED || status == status == JOB_TASK_STATUS_CANCELLED)
+#define QW_SET_QTID(id, qid, tid) do { *(uint64_t *)(id) = (qid); *(uint64_t *)((char *)(id) + sizeof(qid)) = (tid); } while (0)
+#define QW_GET_QTID(id, qid, tid) do { (qid) = *(uint64_t *)(id); (tid) = *(uint64_t *)((char *)(id) + sizeof(qid)); } while (0)
+
+#define QW_ERR_RET(c) do { int32_t _code = c; if (_code != TSDB_CODE_SUCCESS) { terrno = _code; return _code; } } while (0)
+#define QW_RET(c) do { int32_t _code = c; if (_code != TSDB_CODE_SUCCESS) { terrno = _code; } return _code; } while (0)
+#define QW_ERR_LRET(c,...) do { int32_t _code = c; if (_code != TSDB_CODE_SUCCESS) { qError(__VA_ARGS__); terrno = _code; return _code; } } while (0)
+#define QW_ERR_JRET(c) do { code = c; if (code != TSDB_CODE_SUCCESS) { terrno = code; goto _return; } } while (0)
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TD_QWORKER_INT_H_*/
diff --git a/source/libs/qworker/src/qworker.c b/source/libs/qworker/src/qworker.c
new file mode 100644
index 0000000000000000000000000000000000000000..82bfd75b6a1d2ffb22a4c11b6f286b185d6a643a
--- /dev/null
+++ b/source/libs/qworker/src/qworker.c
@@ -0,0 +1,298 @@
+#include "taosmsg.h"
+#include "query.h"
+#include "qworker.h"
+#include "qworkerInt.h"
+#include "planner.h"
+
+int32_t qwAddTaskStatus(SQWorkerMgmt *mgmt, uint64_t schedulerId, uint64_t queryId, uint64_t taskId, int8_t taskStatus) {
+  SQWorkerTaskStatus tStatus = {0};
+  tStatus.status = taskStatus;
+  
+  char id[sizeof(queryId) + sizeof(taskId)] = {0};
+  QW_SET_QTID(id, queryId, taskId);
+
+  SQWorkerSchTaskStatus *schStatus = taosHashGet(mgmt->scheduleHash, &schedulerId, sizeof(schedulerId));
+  if (NULL == schStatus) {
+    SQWorkerSchTaskStatus newSchStatus = {0};
+    newSchStatus.taskStatus = taosHashInit(mgmt->cfg.maxSchTaskNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_ENTRY_LOCK);
+    if (NULL == newSchStatus.taskStatus) {
+      qError("taosHashInit %d failed", mgmt->cfg.maxSchTaskNum);
+      return TSDB_CODE_QRY_OUT_OF_MEMORY;
+    }
+
+    if (0 != taosHashPut(newSchStatus.taskStatus, id, sizeof(id), &tStatus, sizeof(tStatus))) {
+      qError("taosHashPut schedulerId[%"PRIx64"]queryId[%"PRIx64"] taskId[%"PRIx64"] to scheduleHash failed", schedulerId, queryId, taskId);
+      taosHashCleanup(newSchStatus.taskStatus);
+      return TSDB_CODE_QRY_APP_ERROR;
+    }
+
+    newSchStatus.lastAccessTs = taosGetTimestampSec();
+
+    if (0 != taosHashPut(mgmt->scheduleHash, &schedulerId, sizeof(schedulerId), &newSchStatus, sizeof(newSchStatus))) {
+      qError("taosHashPut schedulerId[%"PRIx64"] to scheduleHash failed", schedulerId);
+      taosHashCleanup(newSchStatus.taskStatus);
+      return TSDB_CODE_QRY_APP_ERROR;
+    }
+
+    return TSDB_CODE_SUCCESS;
+  }
+
+  schStatus->lastAccessTs = taosGetTimestampSec();
+
+  if (0 != taosHashPut(schStatus->taskStatus, id, sizeof(id), &tStatus, sizeof(tStatus))) {
+    qError("taosHashPut schedulerId[%"PRIx64"]queryId[%"PRIx64"] taskId[%"PRIx64"] to scheduleHash failed", schedulerId, queryId, taskId);
+    return TSDB_CODE_QRY_APP_ERROR;
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qwGetTaskStatus(SQWorkerMgmt *mgmt, uint64_t schedulerId, uint64_t queryId, uint64_t taskId, SQWorkerTaskStatus **taskStatus) {
+  SQWorkerSchTaskStatus *schStatus = taosHashGet(mgmt->scheduleHash, &schedulerId, sizeof(schedulerId));
+  if (NULL == schStatus) {
+    qError("no scheduler for schedulerId[%"PRIx64"]", schedulerId);
+    return TSDB_CODE_QRY_APP_ERROR;
+  }
+
+  schStatus->lastAccessTs = taosGetTimestampSec();
+  
+  char id[sizeof(queryId) + sizeof(taskId)] = {0};
+  QW_SET_QTID(id, queryId, taskId);
+
+  SQWorkerTaskStatus *tStatus = taosHashGet(schStatus->taskStatus, id, sizeof(id));
+  if (NULL == tStatus) {
+    qError("no task status for schedulerId[%"PRIx64"] queryId[%"PRIx64"] taskId[%"PRIx64"]", schedulerId, queryId, taskId);
+    return TSDB_CODE_QRY_APP_ERROR;
+  }
+
+  *taskStatus = tStatus;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qwAddTaskResult(SQWorkerMgmt *mgmt, uint64_t queryId, uint64_t taskId, void *data) {
+  char id[sizeof(queryId) + sizeof(taskId)] = {0};
+  QW_SET_QTID(id, queryId, taskId);
+
+  SQWorkerResCache resCache = {0};
+  resCache.data = data;
+  
+  if (0 != taosHashPut(mgmt->resHash, id, sizeof(id), &resCache, sizeof(SQWorkerResCache))) {
+    qError("taosHashPut queryId[%"PRIx64"] taskId[%"PRIx64"] to resHash failed", queryId, taskId);
+    return TSDB_CODE_QRY_APP_ERROR;
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
+
+int32_t qwGetTaskResult(SQWorkerMgmt *mgmt, uint64_t queryId, uint64_t taskId, void **data) {
+  char id[sizeof(queryId) + sizeof(taskId)] = {0};
+  QW_SET_QTID(id, queryId, taskId);
+
+  SQWorkerResCache *resCache = taosHashGet(mgmt->resHash, id, sizeof(id));
+  if (NULL == resCache) {
+    qError("no task res for queryId[%"PRIx64"] taskId[%"PRIx64"]", queryId, taskId);
+    return TSDB_CODE_QRY_APP_ERROR;
+  }
+
+  *data = resCache->data;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qwUpdateSchLastAccess(SQWorkerMgmt *mgmt, uint64_t schedulerId) {
+  SQWorkerSchTaskStatus *schStatus = taosHashGet(mgmt->scheduleHash, &schedulerId, sizeof(schedulerId));
+  if (NULL == schStatus) {
+    qError("no scheduler for schedulerId[%"PRIx64"]", schedulerId);
+    return TSDB_CODE_QRY_APP_ERROR;
+  }
+
+  schStatus->lastAccessTs = taosGetTimestampSec();
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qwGetSchTasksStatus(SQWorkerMgmt *mgmt, uint64_t schedulerId, SSchedulerStatusRsp **rsp) {
+  SQWorkerSchTaskStatus *schStatus = taosHashGet(mgmt->scheduleHash, &schedulerId, sizeof(schedulerId));
+  if (NULL == schStatus) {
+    qError("no scheduler for schedulerId[%"PRIx64"]", schedulerId);
+    return TSDB_CODE_QRY_APP_ERROR;
+  }
+
+  schStatus->lastAccessTs = taosGetTimestampSec();
+
+  int32_t i = 0;
+  int32_t taskNum = taosHashGetSize(schStatus->taskStatus);
+  int32_t size = sizeof(SSchedulerStatusRsp) + sizeof((*rsp)->status[0]) * taskNum;
+  *rsp = calloc(1, size);
+  if (NULL == *rsp) {
+    qError("calloc %d failed", size);
+    return TSDB_CODE_QRY_OUT_OF_MEMORY;
+  }
+
+  void *key = NULL;
+  size_t keyLen = 0;
+  void *pIter = taosHashIterate(schStatus->taskStatus, NULL);
+  while (pIter) {
+    SQWorkerTaskStatus *taskStatus = (SQWorkerTaskStatus *)pIter;
+    taosHashGetKey(pIter, &key, &keyLen);
+
+    QW_GET_QTID(key, (*rsp)->status[i].queryId, (*rsp)->status[i].taskId);
+    (*rsp)->status[i].status = taskStatus->status;
+    
+    pIter = taosHashIterate(schStatus->taskStatus, pIter);
+  }  
+
+  (*rsp)->num = taskNum;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qwBuildRspMsg(void *data, int32_t msgType);
+
+
+int32_t qWorkerInit(SQWorkerCfg *cfg, void **qWorkerMgmt) {
+  SQWorkerMgmt *mgmt = calloc(1, sizeof(SQWorkerMgmt));
+  if (NULL == mgmt) {
+    qError("calloc %d failed", (int32_t)sizeof(SQWorkerMgmt));
+    return TSDB_CODE_QRY_OUT_OF_MEMORY;
+  }
+
+  if (cfg) {
+    mgmt->cfg = *cfg;
+  } else {
+    mgmt->cfg.maxSchedulerNum = QWORKER_DEFAULT_SCHEDULER_NUMBER;
+    mgmt->cfg.maxResCacheNum = QWORKER_DEFAULT_RES_CACHE_NUMBER;
+    mgmt->cfg.maxSchTaskNum = QWORKER_DEFAULT_SCH_TASK_NUMBER;
+  }
+
+  mgmt->scheduleHash = taosHashInit(mgmt->cfg.maxSchedulerNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_UBIGINT), false, HASH_ENTRY_LOCK);
+  if (NULL == mgmt->scheduleHash) {
+    tfree(mgmt);
+    QW_ERR_LRET(TSDB_CODE_QRY_OUT_OF_MEMORY, "init %d schduler hash failed", mgmt->cfg.maxSchedulerNum);
+  }
+
+  mgmt->resHash = taosHashInit(mgmt->cfg.maxResCacheNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_ENTRY_LOCK);
+  if (NULL == mgmt->resHash) {
+    taosHashCleanup(mgmt->scheduleHash);
+    mgmt->scheduleHash = NULL;
+    tfree(mgmt);
+    
+    QW_ERR_LRET(TSDB_CODE_QRY_OUT_OF_MEMORY, "init %d res cache hash failed", mgmt->cfg.maxResCacheNum);
+  }
+
+  *qWorkerMgmt = mgmt;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qWorkerProcessQueryMsg(void *qWorkerMgmt, SSchedulerQueryMsg *msg, SRpcMsg *rsp) {
+  if (NULL == qWorkerMgmt || NULL == msg || NULL == rsp) {
+    return TSDB_CODE_QRY_INVALID_INPUT;
+  }
+
+  SSubplan *plan = NULL;
+  SQWorkerTaskStatus *tStatus = NULL;
+
+  int32_t code = qStringToSubplan(msg->msg, &plan);
+  if (TSDB_CODE_SUCCESS != code) {
+    qError("schId:%"PRIx64",qId:%"PRIx64",taskId:%"PRIx64" string to subplan failed, code:%d", msg->schedulerId, msg->queryId, msg->taskId, code);
+    return code;
+  }
+  
+  //TODO call executer to init subquery
+
+  QW_ERR_JRET(qwAddTaskStatus(qWorkerMgmt, msg->schedulerId, msg->queryId, msg->taskId, JOB_TASK_STATUS_EXECUTING));
+
+  QW_ERR_JRET(qwBuildRspMsg(NULL, TSDB_MSG_TYPE_QUERY_RSP));
+
+  //TODO call executer to execute subquery
+  code = 0;
+  void *data = NULL;
+  //TODO call executer to execute subquery
+
+  QW_ERR_JRET(qwGetTaskStatus(qWorkerMgmt, msg->schedulerId, msg->queryId, msg->taskId, &tStatus));
+
+  tStatus->status = (code) ? JOB_TASK_STATUS_FAILED : JOB_TASK_STATUS_SUCCEED;
+
+  QW_ERR_JRET(qwAddTaskResult(qWorkerMgmt, msg->queryId, msg->taskId, data));
+
+_return:
+
+  if (tStatus && QW_TASK_DONE(tStatus->status) && QW_READY_RECEIVED == tStatus->ready) {
+    QW_ERR_RET(qwBuildRspMsg(NULL, TSDB_MSG_TYPE_RES_READY_RSP));
+  }
+
+  qDestroySubplan(plan);
+  
+  return code;
+}
+
+int32_t qWorkerProcessReadyMsg(void *qWorkerMgmt, SSchedulerReadyMsg *msg, SRpcMsg *rsp){
+  if (NULL == qWorkerMgmt || NULL == msg || NULL == rsp) {
+    return TSDB_CODE_QRY_INVALID_INPUT;
+  }
+
+  SQWorkerTaskStatus *tStatus = NULL;
+  
+  QW_ERR_RET(qwGetTaskStatus(qWorkerMgmt, msg->schedulerId, msg->queryId, msg->taskId, &tStatus));
+  
+  if (QW_TASK_DONE(tStatus->status)) {
+    QW_ERR_RET(qwBuildRspMsg(tStatus, TSDB_MSG_TYPE_RES_READY_RSP));
+  } else {
+    tStatus->ready = QW_READY_RECEIVED;
+    
+    return TSDB_CODE_SUCCESS;
+  }
+
+  tStatus->ready = QW_READY_RESPONSED;
+  
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qWorkerProcessStatusMsg(void *qWorkerMgmt, SSchedulerStatusMsg *msg, SRpcMsg *rsp) {
+  if (NULL == qWorkerMgmt || NULL == msg || NULL == rsp) {
+    return TSDB_CODE_QRY_INVALID_INPUT;
+  }
+
+  SSchedulerStatusRsp *sStatus = NULL;
+  
+  QW_ERR_RET(qwGetSchTasksStatus(qWorkerMgmt, msg->schedulerId, &sStatus));
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qWorkerProcessFetchMsg(void *qWorkerMgmt, SSchedulerFetchMsg *msg, SRpcMsg *rsp) {
+  if (NULL == qWorkerMgmt || NULL == msg || NULL == rsp) {
+    return TSDB_CODE_QRY_INVALID_INPUT;
+  }
+
+  QW_ERR_RET(qwUpdateSchLastAccess(qWorkerMgmt, msg->schedulerId));
+
+  void *data = NULL;
+  
+  QW_ERR_RET(qwGetTaskResult(qWorkerMgmt, msg->queryId, msg->taskId, &data));
+
+  QW_ERR_RET(qwBuildRspMsg(data, TSDB_MSG_TYPE_FETCH_RSP));
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qWorkerProcessCancelMsg(void *qWorkerMgmt, SSchedulerCancelMsg *msg, SRpcMsg *rsp);
+
+void qWorkerDestroy(void **qWorkerMgmt) {
+  if (NULL == qWorkerMgmt || NULL == *qWorkerMgmt) {
+    return;
+  }
+
+  SQWorkerMgmt *mgmt = *qWorkerMgmt;
+  
+  //TODO STOP ALL QUERY
+
+  //TODO FREE ALL
+
+  tfree(*qWorkerMgmt);
+}
+
+
diff --git a/source/libs/scheduler/inc/schedulerInt.h b/source/libs/scheduler/inc/schedulerInt.h
index 73e7c4d24e1c2693d174dcb7acad4112939778c3..3fab91edacd77096fbacceee5df3f762452ad16d 100644
--- a/source/libs/scheduler/inc/schedulerInt.h
+++ b/source/libs/scheduler/inc/schedulerInt.h
@@ -31,17 +31,9 @@ extern "C" {
 
 #define SCH_MAX_CONDIDATE_EP_NUM TSDB_MAX_REPLICA
 
-enum {
-  SCH_STATUS_NOT_START = 1,
-  SCH_STATUS_EXECUTING,
-  SCH_STATUS_SUCCEED,
-  SCH_STATUS_FAILED,
-  SCH_STATUS_CANCELLING,
-  SCH_STATUS_CANCELLED
-};
-
 typedef struct SSchedulerMgmt {
-  uint64_t  taskId;
+  uint64_t  taskId; 
+  uint64_t  schedulerId;
   SSchedulerCfg cfg;
   SHashObj *Jobs;  // key: queryId, value: SQueryJob*
 } SSchedulerMgmt;
diff --git a/source/libs/scheduler/src/scheduler.c b/source/libs/scheduler/src/scheduler.c
index 6014ff9ab6282248f52bfe1aba0535e5b4d4cb71..99a9b06fe441832d42fbc5bc86ad24bcc3ebc263 100644
--- a/source/libs/scheduler/src/scheduler.c
+++ b/source/libs/scheduler/src/scheduler.c
@@ -161,7 +161,7 @@ int32_t schValidateAndBuildJob(SQueryDag *dag, SQueryJob *job) {
   SArray *levelPlans = NULL;
   int32_t levelPlanNum = 0;
 
-  level.status = SCH_STATUS_NOT_START;
+  level.status = JOB_TASK_STATUS_NOT_START;
 
   for (int32_t i = 0; i < levelNum; ++i) {
     level.level = i;
@@ -191,7 +191,7 @@ int32_t schValidateAndBuildJob(SQueryDag *dag, SQueryJob *job) {
       
       task.taskId = atomic_add_fetch_64(&schMgmt.taskId, 1);
       task.plan = plan;
-      task.status = SCH_STATUS_NOT_START;
+      task.status = JOB_TASK_STATUS_NOT_START;
 
       void *p = taosArrayPush(level.subTasks, &task);
       if (NULL == p) {
@@ -304,13 +304,15 @@ int32_t schAsyncSendMsg(SQueryJob *job, SQueryTask *task, int32_t msgType) {
       }
 
       SSchedulerQueryMsg *pMsg = msg;
-      pMsg->queryId = job->queryId;
-      pMsg->taskId = task->taskId;
-      pMsg->contentLen = len;
+      
+      pMsg->schedulerId = htobe64(schMgmt.schedulerId);
+      pMsg->queryId = htobe64(job->queryId);
+      pMsg->taskId = htobe64(task->taskId);
+      pMsg->contentLen = htonl(len);
       memcpy(pMsg->msg, task->msg, len);
       break;
     }
-    case TSDB_MSG_TYPE_RSP_READY: {
+    case TSDB_MSG_TYPE_RES_READY: {
       msgSize = sizeof(SSchedulerReadyMsg);
       msg = calloc(1, msgSize);
       if (NULL == msg) {
@@ -319,8 +321,8 @@ int32_t schAsyncSendMsg(SQueryJob *job, SQueryTask *task, int32_t msgType) {
       }
 
       SSchedulerReadyMsg *pMsg = msg;
-      pMsg->queryId = job->queryId;
-      pMsg->taskId = task->taskId;      
+      pMsg->queryId = htobe64(job->queryId);
+      pMsg->taskId = htobe64(task->taskId);      
       break;
     }
     case TSDB_MSG_TYPE_FETCH: {
@@ -332,8 +334,8 @@ int32_t schAsyncSendMsg(SQueryJob *job, SQueryTask *task, int32_t msgType) {
       }
     
       SSchedulerFetchMsg *pMsg = msg;
-      pMsg->queryId = job->queryId;
-      pMsg->taskId = task->taskId;      
+      pMsg->queryId = htobe64(job->queryId);
+      pMsg->taskId = htobe64(task->taskId);      
       break;
     }
     default:
@@ -376,7 +378,7 @@ _return:
 
 
 int32_t schProcessOnJobSuccess(SQueryJob *job) {
-  job->status = SCH_STATUS_SUCCEED;
+  job->status = JOB_TASK_STATUS_SUCCEED;
   
   if (job->userFetch) {
     SCH_ERR_RET(schFetchFromRemote(job));
@@ -386,7 +388,7 @@ int32_t schProcessOnJobSuccess(SQueryJob *job) {
 }
 
 int32_t schProcessOnJobFailure(SQueryJob *job) {
-  job->status = SCH_STATUS_FAILED;
+  job->status = JOB_TASK_STATUS_FAILED;
 
   atomic_val_compare_exchange_32(&job->remoteFetch, 1, 0);
 
@@ -413,7 +415,7 @@ int32_t schProcessOnTaskSuccess(SQueryJob *job, SQueryTask *task) {
     return TSDB_CODE_SUCCESS;
   }
 
-  task->status = SCH_STATUS_SUCCEED;
+  task->status = JOB_TASK_STATUS_SUCCEED;
   
   int32_t parentNum = (int32_t)taosArrayGetSize(task->parents);
   if (parentNum == 0) {
@@ -459,7 +461,7 @@ int32_t schProcessOnTaskFailure(SQueryJob *job, SQueryTask *task, int32_t errCod
   if (!needRetry) {
     SCH_TASK_ERR_LOG("task failed[%x], no more retry", errCode);
     
-    job->status = SCH_STATUS_FAILED;
+    job->status = JOB_TASK_STATUS_FAILED;
     SCH_ERR_RET(schProcessOnJobFailure(job));
 
     return TSDB_CODE_SUCCESS;
@@ -478,13 +480,13 @@ int32_t schHandleRspMsg(SQueryJob *job, SQueryTask *task, int32_t msgType, int32
       if (rspCode != TSDB_CODE_SUCCESS) {
         SCH_ERR_JRET(schProcessOnTaskFailure(job, task, rspCode));
       } else {
-        code = schAsyncSendMsg(job, task, TSDB_MSG_TYPE_RSP_READY);
+        code = schAsyncSendMsg(job, task, TSDB_MSG_TYPE_RES_READY);
         if (code) {
           goto _task_error;
         }
       }
       break;
-    case TSDB_MSG_TYPE_RSP_READY:
+    case TSDB_MSG_TYPE_RES_READY:
       if (rspCode != TSDB_CODE_SUCCESS) {
         SCH_ERR_JRET(schProcessOnTaskFailure(job, task, rspCode));
       } else {
@@ -534,7 +536,7 @@ int32_t schLaunchTask(SQueryJob *job, SQueryTask *task) {
 
   SCH_ERR_RET(schPushTaskToExecList(job, task));
 
-  task->status = SCH_STATUS_EXECUTING;
+  task->status = JOB_TASK_STATUS_EXECUTING;
 
   return TSDB_CODE_SUCCESS;
 }
@@ -546,22 +548,26 @@ int32_t schLaunchJob(SQueryJob *job) {
     SCH_ERR_RET(schLaunchTask(job, task));
   }
 
-  job->status = SCH_STATUS_EXECUTING;
+  job->status = JOB_TASK_STATUS_EXECUTING;
   
   return TSDB_CODE_SUCCESS;
 }
 
 
 int32_t schedulerInit(SSchedulerCfg *cfg) {
-  schMgmt.Jobs = taosHashInit(SCHEDULE_DEFAULT_JOB_NUMBER, taosGetDefaultHashFunction(TSDB_DATA_TYPE_UBIGINT), false, HASH_ENTRY_LOCK);
-  if (NULL == schMgmt.Jobs) {
-    SCH_ERR_LRET(TSDB_CODE_QRY_OUT_OF_MEMORY, "init %d schduler jobs failed", SCHEDULE_DEFAULT_JOB_NUMBER);
-  }
-
   if (cfg) {
     schMgmt.cfg = *cfg;
+  } else {
+    schMgmt.cfg.maxJobNum = SCHEDULE_DEFAULT_JOB_NUMBER;
   }
 
+  schMgmt.Jobs = taosHashInit(schMgmt.cfg.maxJobNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_UBIGINT), false, HASH_ENTRY_LOCK);
+  if (NULL == schMgmt.Jobs) {
+    SCH_ERR_LRET(TSDB_CODE_QRY_OUT_OF_MEMORY, "init %d schduler jobs failed", schMgmt.cfg.maxJobNum);
+  }
+
+  schMgmt.schedulerId = 1; //TODO GENERATE A UUID
+  
   return TSDB_CODE_SUCCESS;
 }
 
@@ -605,7 +611,7 @@ int32_t scheduleExecJob(void *transport, SArray *qnodeList, SQueryDag* pDag, voi
     SCH_ERR_JRET(TSDB_CODE_SCH_INTERNAL_ERROR);
   }
 
-  job->status = SCH_STATUS_NOT_START;
+  job->status = JOB_TASK_STATUS_NOT_START;
   
   SCH_ERR_JRET(schLaunchJob(job));
 
@@ -634,7 +640,7 @@ int32_t scheduleFetchRows(void *pJob, void **data) {
     return TSDB_CODE_QRY_APP_ERROR;
   }
 
-  if (job->status == SCH_STATUS_SUCCEED) {
+  if (job->status == JOB_TASK_STATUS_SUCCEED) {
     SCH_ERR_JRET(schFetchFromRemote(job));
   }
 
@@ -668,7 +674,7 @@ void scheduleFreeJob(void *pJob) {
       return;
     }
 
-    if (job->status == SCH_STATUS_EXECUTING) {
+    if (job->status == JOB_TASK_STATUS_EXECUTING) {
       scheduleCancelJob(pJob);
     }
   }
diff --git a/source/util/src/thash.c b/source/util/src/thash.c
index bfc6b47fa6abd80245b021954ee908156e9eebeb..c4f6f78106e1ee6703e0429e705f62ab83db1881 100644
--- a/source/util/src/thash.c
+++ b/source/util/src/thash.c
@@ -776,9 +776,16 @@ size_t taosHashGetMemSize(const SHashObj *pHashObj) {
   return (pHashObj->capacity * (sizeof(SHashEntry) + POINTER_BYTES)) + sizeof(SHashNode) * taosHashGetSize(pHashObj) + sizeof(SHashObj);
 }
 
-FORCE_INLINE void *taosHashGetDataKey(SHashObj *pHashObj, void *data) {
+FORCE_INLINE int32_t taosHashGetKey(void *data, void** key, size_t* keyLen) {
+  if (NULL == data || NULL == key) {
+    return -1;
+  }
+  
   SHashNode * node = GET_HASH_PNODE(data);
-  return GET_HASH_NODE_KEY(node);
+  *key = GET_HASH_NODE_KEY(node);
+  *keyLen = node->keyLen;
+
+  return 0;
 }
 
 FORCE_INLINE uint32_t taosHashGetDataKeyLen(SHashObj *pHashObj, void *data) {