diff --git a/src/common/inc/tglobal.h b/src/common/inc/tglobal.h
index 360a83eea8df9392b059e73ac59075b27a96f7c3..604ce89432bcf662b319fb2ec11f55026450a2be 100644
--- a/src/common/inc/tglobal.h
+++ b/src/common/inc/tglobal.h
@@ -224,6 +224,8 @@ extern uint32_t maxRange;
 extern uint32_t curRange;
 extern char Compressor[];
 #endif
+// long query 
+extern int8_t tsDeadLockKillQuery;
 
 typedef struct {
   char dir[TSDB_FILENAME_LEN];
diff --git a/src/common/src/tglobal.c b/src/common/src/tglobal.c
index 6e73227233591fa076893174b65a774f229ca4e5..7706820559819e82bbdbee72604ef5dc41142452 100644
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@@ -279,6 +279,9 @@ uint32_t curRange     = 100;    // range
 char     Compressor[32] = "ZSTD_COMPRESSOR"; // ZSTD_COMPRESSOR or GZIP_COMPRESSOR 
 #endif
 
+// long query death-lock
+int8_t tsDeadLockKillQuery = 0;
+
 int32_t (*monStartSystemFp)() = NULL;
 void (*monStopSystemFp)() = NULL;
 void (*monExecuteSQLFp)(char *sql) = NULL;
@@ -1613,7 +1616,17 @@ static void doInitGlobalConfig(void) {
   cfg.unitType = TAOS_CFG_UTYPE_NONE;
   taosInitConfigOption(cfg);
 
-  assert(tsGlobalConfigNum <= TSDB_CFG_MAX_NUM);
+   // enable kill long query
+  cfg.option = "deadLockKillQuery";
+  cfg.ptr = &tsDeadLockKillQuery;
+  cfg.valType = TAOS_CFG_VTYPE_INT8;
+  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_SHOW;
+  cfg.minValue = 0;
+  cfg.maxValue = 1;
+  cfg.ptrLength = 1;
+  cfg.unitType = TAOS_CFG_UTYPE_NONE;
+  taosInitConfigOption(cfg);
+
 #ifdef TD_TSZ
   // lossy compress
   cfg.option = "lossyColumns";
@@ -1667,6 +1680,9 @@ static void doInitGlobalConfig(void) {
   cfg.ptrLength = 0;
   cfg.unitType = TAOS_CFG_UTYPE_NONE;
   taosInitConfigOption(cfg);
+  assert(tsGlobalConfigNum == TSDB_CFG_MAX_NUM);
+#else
+  assert(tsGlobalConfigNum == TSDB_CFG_MAX_NUM - 5);
 #endif
 
 }
diff --git a/src/inc/query.h b/src/inc/query.h
index fb9cbff8584892b4a6bc6e4a6ce046a7500aef39..0872e3dbaa517ded77dd758b30e69f273c13a580 100644
--- a/src/inc/query.h
+++ b/src/inc/query.h
@@ -76,6 +76,11 @@ void* qGetResultRetrieveMsg(qinfo_t qinfo);
  */
 int32_t qKillQuery(qinfo_t qinfo);
 
+//kill by qid 
+int32_t qKillQueryByQId(void* pMgmt, int64_t qId, int32_t waitMs, int32_t waitCount);
+
+bool qSolveCommitNoBlock(void* pRepo, void* pMgmt);
+
 int32_t qQueryCompleted(qinfo_t qinfo);
 
 /**
diff --git a/src/inc/taoserror.h b/src/inc/taoserror.h
index 882aca2b5259385c6c7f308d1764f8da9bea80e9..5b4657f7a322bb351e4d41711d2960f4ac2b7657 100644
--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -35,6 +35,7 @@ int32_t* taosGetErrno();
 #define terrno                              (*taosGetErrno())
  
 #define TSDB_CODE_SUCCESS                   0
+#define TSDB_CODE_FAILED                    -1   // unknown or needn't tell detail error
 
 // rpc
 #define TSDB_CODE_RPC_ACTION_IN_PROGRESS        TAOS_DEF_ERROR_CODE(0, 0x0001)  //"Action in progress")
diff --git a/src/inc/tsdb.h b/src/inc/tsdb.h
index 7abe3e99c720af1682fc103beec9a5d4caeb09eb..089e30ac3728761c68fe155f960c8650a32c2f7a 100644
--- a/src/inc/tsdb.h
+++ b/src/inc/tsdb.h
@@ -39,6 +39,7 @@ extern "C" {
 
 #define TSDB_STATUS_COMMIT_START 1
 #define TSDB_STATUS_COMMIT_OVER 2
+#define TSDB_STATUS_COMMIT_NOBLOCK 3 //commit no block, need to be solved 
 
 // TSDB STATE DEFINITION
 #define TSDB_STATE_OK 0x0
@@ -413,6 +414,11 @@ int tsdbSyncRecv(void *pRepo, SOCKET socketFd);
 // For TSDB Compact
 int tsdbCompact(STsdbRepo *pRepo);
 
+// For TSDB Health Monitor
+
+// no problem return true
+bool tsdbNoProblem(STsdbRepo* pRepo);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 8fefed51c8c8e80d6a6f05d0da74dc1c6075d1bd..0202e53b3ec68b099983bc13f99c6a218bba990c 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -2398,11 +2398,11 @@ bool isQueryKilled(SQInfo *pQInfo) {
 
   // query has been executed more than tsShellActivityTimer, and the retrieve has not arrived
   // abort current query execution.
-  if (pQInfo->owner != 0 && ((taosGetTimestampSec() - pQInfo->startExecTs) > getMaximumIdleDurationSec()) &&
+  if (pQInfo->owner != 0 && ((taosGetTimestampSec() - pQInfo->startExecTs/1000) > getMaximumIdleDurationSec()) &&
       (!needBuildResAfterQueryComplete(pQInfo))) {
 
     assert(pQInfo->startExecTs != 0);
-    qDebug("QInfo:%" PRIu64 " retrieve not arrive beyond %d sec, abort current query execution, start:%" PRId64
+    qDebug("QInfo:%" PRIu64 " retrieve not arrive beyond %d ms, abort current query execution, start:%" PRId64
            ", current:%d", pQInfo->qId, 1, pQInfo->startExecTs, taosGetTimestampSec());
     return true;
   }
@@ -8409,6 +8409,7 @@ SQInfo* createQInfoImpl(SQueryTableMsg* pQueryMsg, SGroupbyExpr* pGroupbyExpr, S
   }
 
   pQInfo->qId = qId;
+  pQInfo->startExecTs = 0;
 
   pQInfo->runtimeEnv.pUdfInfo = pUdfInfo;
 
diff --git a/src/query/src/queryMain.c b/src/query/src/queryMain.c
index d56c12ab8735d0683db146f7000429d4d554dda5..1460fbdc0fd0324da28bf1161c34c564584258cd 100644
--- a/src/query/src/queryMain.c
+++ b/src/query/src/queryMain.c
@@ -35,7 +35,7 @@ typedef struct SQueryMgmt {
   bool            closed;
 } SQueryMgmt;
 
-static void queryMgmtKillQueryFn(void* handle) {
+static void queryMgmtKillQueryFn(void* handle, void* param1) {
   void** fp = (void**)handle;
   qKillQuery(*fp);
 }
@@ -215,6 +215,51 @@ int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryMsg, qi
   return code;
 }
 
+#ifdef TEST_IMPL
+// wait moment
+int waitMoment(SQInfo* pQInfo){
+  if(pQInfo->sql) {
+    int ms = 0;
+    char* pcnt = strstr(pQInfo->sql, " count(*)");
+    if(pcnt) return 0;
+    
+    char* pos = strstr(pQInfo->sql, " t_");
+    if(pos){
+      pos += 3;
+      ms = atoi(pos);
+      while(*pos >= '0' && *pos <= '9'){
+        pos ++;
+      }
+      char unit_char = *pos;
+      if(unit_char == 'h'){
+        ms *= 3600*1000;
+      } else if(unit_char == 'm'){
+        ms *= 60*1000;
+      } else if(unit_char == 's'){
+        ms *= 1000;
+      }
+    }
+    if(ms == 0) return 0;
+    printf("test wait sleep %dms. sql=%s ...\n", ms, pQInfo->sql);
+    
+    if(ms < 1000) {
+      taosMsleep(ms);
+    } else {
+      int used_ms = 0;
+      while(used_ms < ms) {
+        taosMsleep(1000);
+        used_ms += 1000;
+        if(isQueryKilled(pQInfo)){
+          printf("test check query is canceled, sleep break.%s\n", pQInfo->sql);
+          break;
+        }
+      }
+    }
+  }
+  return 1;
+}
+#endif
+
 bool qTableQuery(qinfo_t qinfo, uint64_t *qId) {
   SQInfo *pQInfo = (SQInfo *)qinfo;
   assert(pQInfo && pQInfo->signature == pQInfo);
@@ -228,7 +273,8 @@ bool qTableQuery(qinfo_t qinfo, uint64_t *qId) {
   }
 
   *qId = pQInfo->qId;
-  pQInfo->startExecTs = taosGetTimestampSec();
+  if(pQInfo->startExecTs == 0)
+    pQInfo->startExecTs = taosGetTimestampMs();
 
   if (isQueryKilled(pQInfo)) {
     qDebug("QInfo:0x%"PRIx64" it is already killed, abort", pQInfo->qId);
@@ -259,7 +305,9 @@ bool qTableQuery(qinfo_t qinfo, uint64_t *qId) {
   int64_t st = taosGetTimestampUs();
   pRuntimeEnv->outputBuf = pRuntimeEnv->proot->exec(pRuntimeEnv->proot, &newgroup);
   pQInfo->summary.elapsedTime += (taosGetTimestampUs() - st);
-
+#ifdef TEST_IMPL
+  waitMoment(pQInfo);
+#endif
   publishOperatorProfEvent(pRuntimeEnv->proot, QUERY_PROF_AFTER_OPERATOR_EXEC);
   pRuntimeEnv->resultInfo.total += GET_NUM_OF_RESULTS(pRuntimeEnv);
 
@@ -479,7 +527,7 @@ void qQueryMgmtNotifyClosed(void* pQMgmt) {
   pQueryMgmt->closed = true;
   pthread_mutex_unlock(&pQueryMgmt->lock);
 
-  taosCacheRefresh(pQueryMgmt->qinfoPool, queryMgmtKillQueryFn);
+  taosCacheRefresh(pQueryMgmt->qinfoPool, queryMgmtKillQueryFn, NULL);
 }
 
 void qQueryMgmtReOpen(void *pQMgmt) {
@@ -574,3 +622,148 @@ void** qReleaseQInfo(void* pMgmt, void* pQInfo, bool freeHandle) {
   taosCacheRelease(pQueryMgmt->qinfoPool, pQInfo, freeHandle);
   return 0;
 }
+
+//kill by qid
+int32_t qKillQueryByQId(void* pMgmt, int64_t qId, int32_t waitMs, int32_t waitCount) {
+  int32_t error = TSDB_CODE_SUCCESS;
+  void** handle = qAcquireQInfo(pMgmt, qId);
+  if(handle == NULL) return terrno;
+
+  SQInfo* pQInfo = (SQInfo*)(*handle);
+  if (pQInfo == NULL || !isValidQInfo(pQInfo)) {
+    return TSDB_CODE_QRY_INVALID_QHANDLE;
+  }
+  qWarn("QId:0x%"PRIx64" be killed(no memory commit).", pQInfo->qId);
+  setQueryKilled(pQInfo);
+
+  // wait query stop
+  int32_t loop = 0;
+  while (pQInfo->owner != 0) {
+    taosMsleep(waitMs);
+    if(loop++ > waitCount){
+      error = TSDB_CODE_FAILED;
+      break;
+    }
+  }
+
+  qReleaseQInfo(pMgmt, (void **)&handle, true);
+  return error;
+}
+
+// local struct
+typedef struct {
+  int64_t qId;
+  int64_t startExecTs;
+} SLongQuery;
+
+// callbark for sort compare 
+static int compareLongQuery(const void* p1, const void* p2) {
+  // sort desc 
+  SLongQuery* plq1 = *(SLongQuery**)p1;
+  SLongQuery* plq2 = *(SLongQuery**)p2;
+  if(plq1->startExecTs == plq2->startExecTs) {
+    return 0;
+  } else if(plq1->startExecTs > plq2->startExecTs) {
+    return 1;
+  } else {
+    return -1;
+  }
+}
+
+// callback for taosCacheRefresh
+static void cbFoundItem(void* handle, void* param1) {
+  SQInfo * qInfo = *(SQInfo**) handle;
+  if(qInfo == NULL) return ;
+  SArray* qids = (SArray*) param1;
+  if(qids == NULL) return ;
+  
+  bool usedMem = true;
+  bool usedIMem = true;
+  SMemTable* mem = qInfo->query.memRef.snapshot.omem;
+  SMemTable* imem = qInfo->query.memRef.snapshot.imem;
+  if(mem == NULL || T_REF_VAL_GET(mem) == 0)  
+     usedMem = false;
+  if(imem == NULL || T_REF_VAL_GET(mem) == 0) 
+     usedIMem = false ;
+
+  if(!usedMem && !usedIMem) 
+     return ;
+   
+  // push to qids
+  SLongQuery* plq = (SLongQuery*)malloc(sizeof(SLongQuery));
+  plq->qId = qInfo->qId;
+  plq->startExecTs = qInfo->startExecTs; 
+  taosArrayPush(qids, &plq);
+}
+
+// longquery
+void* qObtainLongQuery(void* param){
+  SQueryMgmt* qMgmt =  (SQueryMgmt*)param;
+  if(qMgmt == NULL || qMgmt->qinfoPool == NULL) 
+    return NULL;
+  SArray* qids = taosArrayInit(4, sizeof(int64_t*));
+  if(qids == NULL) return NULL;
+  // Get each item
+  taosCacheRefresh(qMgmt->qinfoPool, cbFoundItem, qids);
+  
+  size_t cnt = taosArrayGetSize(qids);
+  if(cnt == 0) {
+    taosArrayDestroy(qids);
+    return NULL;
+  } 
+  if(cnt > 1)
+    taosArraySort(qids, compareLongQuery);
+
+  return qids;   
+}
+
+//solve tsdb no block to commit
+bool qFixedNoBlock(void* pRepo, void* pMgmt, int32_t longQueryMs) {
+  SQueryMgmt *pQueryMgmt = pMgmt;
+  bool fixed = false;
+
+  // qid top list
+  SArray *qids = (SArray*)qObtainLongQuery(pQueryMgmt);
+  if(qids == NULL) return false;
+
+  // kill Query
+  int64_t now = taosGetTimestampMs();
+  size_t cnt = taosArrayGetSize(qids);
+  size_t i;
+  SLongQuery* plq;
+  for(i=0; i < cnt; i++) {
+    plq = (SLongQuery* )taosArrayGetP(qids, i);
+    if(plq->startExecTs > now) continue;
+    if(now - plq->startExecTs >= longQueryMs) {
+      qKillQueryByQId(pMgmt, plq->qId, 500, 10); // wait 50*100 ms 
+      if(tsdbNoProblem(pRepo)) {
+        fixed = true;
+        qWarn("QId:0x%"PRIx64" fixed problem after kill this query.", plq->qId);
+        break;
+      }
+    }
+  }
+  
+  // free qids
+  for(i=0; i < cnt; i++) {
+    free(taosArrayGetP(qids, i));
+  }
+  taosArrayDestroy(qids);
+  return fixed;
+}
+
+//solve tsdb no block to commit
+bool qSolveCommitNoBlock(void* pRepo, void* pMgmt) {
+  qWarn("pRepo=%p start solve problem.", pRepo);
+  if(qFixedNoBlock(pRepo, pMgmt, 10*60*1000)) {
+    return true;
+  }
+  if(qFixedNoBlock(pRepo, pMgmt, 2*60*1000)){
+    return true;
+  }
+  if(qFixedNoBlock(pRepo, pMgmt, 30*1000)){
+    return true;
+  }
+  qWarn("pRepo=%p solve problem failed.", pRepo);
+  return false;
+}
diff --git a/src/tsdb/inc/tsdbBuffer.h b/src/tsdb/inc/tsdbBuffer.h
index ec6b057aef142fb938993b3a27717c5e64937258..4b650d3993a54f6a98caf00a3605feb37e972ebd 100644
--- a/src/tsdb/inc/tsdbBuffer.h
+++ b/src/tsdb/inc/tsdbBuffer.h
@@ -29,6 +29,7 @@ typedef struct {
   int            tBufBlocks;
   int            nBufBlocks;
   int            nRecycleBlocks;
+  int            nElasticBlocks;
   int64_t        index;
   SList*         bufBlockList;  
 } STsdbBufPool;
@@ -41,6 +42,10 @@ int           tsdbOpenBufPool(STsdbRepo* pRepo);
 void          tsdbCloseBufPool(STsdbRepo* pRepo);
 SListNode*    tsdbAllocBufBlockFromPool(STsdbRepo* pRepo);
 int           tsdbExpandPool(STsdbRepo* pRepo, int32_t oldTotalBlocks);
-void          tsdbRecycleBufferBlock(STsdbBufPool* pPool, SListNode *pNode);
+void          tsdbRecycleBufferBlock(STsdbBufPool* pPool, SListNode *pNode, bool bELastic);
+
+// health cite
+STsdbBufBlock *tsdbNewBufBlock(int bufBlockSize);
+void tsdbFreeBufBlock(STsdbBufBlock *pBufBlock);
 
 #endif /* _TD_TSDB_BUFFER_H_ */
diff --git a/src/tsdb/inc/tsdbHealth.h b/src/tsdb/inc/tsdbHealth.h
new file mode 100644
index 0000000000000000000000000000000000000000..324f4312e05fc0ca0200c319728bf692bf476bf6
--- /dev/null
+++ b/src/tsdb/inc/tsdbHealth.h
@@ -0,0 +1,25 @@
+/*
+ * 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_TSDB_HEALTH_H_
+#define _TD_TSDB_HEALTH_H_
+
+bool tsdbUrgeQueryFree(STsdbRepo* pRepo);
+int32_t tsdbInsertNewBlock(STsdbRepo* pRepo);
+
+bool tsdbIdleMemEnough();
+bool tsdbAllowNewBlock(STsdbRepo* pRepo);
+
+#endif /* _TD_TSDB_BUFFER_H_ */
diff --git a/src/tsdb/inc/tsdbint.h b/src/tsdb/inc/tsdbint.h
index 532907ae01be576e40feea2969761846f07170b3..80e92975799f47d68ff72ef80a52efb6fe901b5e 100644
--- a/src/tsdb/inc/tsdbint.h
+++ b/src/tsdb/inc/tsdbint.h
@@ -97,6 +97,7 @@ struct STsdbRepo {
 
   SMergeBuf       mergeBuf;  //used when update=2
   int8_t          compactState;  // compact state: inCompact/noCompact/waitingCompact?
+  pthread_t*      pthread;
 };
 
 #define REPO_ID(r) (r)->config.tsdbId
diff --git a/src/tsdb/src/tsdbBuffer.c b/src/tsdb/src/tsdbBuffer.c
index e675bf6f9de04021112d43a1db70cf56cf430f08..70589031f6516a129a5a683b0e76edb23b814e15 100644
--- a/src/tsdb/src/tsdbBuffer.c
+++ b/src/tsdb/src/tsdbBuffer.c
@@ -14,12 +14,10 @@
  */
 
 #include "tsdbint.h"
+#include "tsdbHealth.h"
 
 #define POOL_IS_EMPTY(b) (listNEles((b)->bufBlockList) == 0)
 
-static STsdbBufBlock *tsdbNewBufBlock(int bufBlockSize);
-static void           tsdbFreeBufBlock(STsdbBufBlock *pBufBlock);
-
 // ---------------- INTERNAL FUNCTIONS ----------------
 STsdbBufPool *tsdbNewBufPool() {
   STsdbBufPool *pBufPool = (STsdbBufPool *)calloc(1, sizeof(*pBufPool));
@@ -65,10 +63,10 @@ int tsdbOpenBufPool(STsdbRepo *pRepo) {
   STsdbBufPool *pPool = pRepo->pPool;
 
   ASSERT(pPool != NULL);
-
   pPool->bufBlockSize = pCfg->cacheBlockSize * 1024 * 1024; // MB
   pPool->tBufBlocks = pCfg->totalBlocks;
   pPool->nBufBlocks = 0;
+  pPool->nElasticBlocks = 0;
   pPool->index = 0;
   pPool->nRecycleBlocks = 0;
 
@@ -120,6 +118,18 @@ SListNode *tsdbAllocBufBlockFromPool(STsdbRepo *pRepo) {
   STsdbBufPool *pBufPool = pRepo->pPool;
 
   while (POOL_IS_EMPTY(pBufPool)) {
+    if(tsDeadLockKillQuery) {
+      // supply new Block 
+      if(tsdbInsertNewBlock(pRepo) > 0) {
+        tsdbWarn("vgId:%d add new elastic block . elasticBlocks=%d cur free Blocks=%d", REPO_ID(pRepo), pBufPool->nElasticBlocks, pBufPool->bufBlockList->numOfEles);
+        break;
+      } else {
+        // no newBlock, kill query free
+        if(!tsdbUrgeQueryFree(pRepo))
+          tsdbWarn("vgId:%d Urge query free thread start failed.", REPO_ID(pRepo));
+      }
+    }
+
     pRepo->repoLocked = false;
     pthread_cond_wait(&(pBufPool->poolNotEmpty), &(pRepo->mutex));
     pRepo->repoLocked = true;
@@ -139,11 +149,11 @@ SListNode *tsdbAllocBufBlockFromPool(STsdbRepo *pRepo) {
 }
 
 // ---------------- LOCAL FUNCTIONS ----------------
-static STsdbBufBlock *tsdbNewBufBlock(int bufBlockSize) {
+STsdbBufBlock *tsdbNewBufBlock(int bufBlockSize) {
   STsdbBufBlock *pBufBlock = (STsdbBufBlock *)malloc(sizeof(*pBufBlock) + bufBlockSize);
   if (pBufBlock == NULL) {
     terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
-    goto _err;
+    return NULL;
   }
 
   pBufBlock->blockId = 0;
@@ -151,13 +161,9 @@ static STsdbBufBlock *tsdbNewBufBlock(int bufBlockSize) {
   pBufBlock->remain = bufBlockSize;
 
   return pBufBlock;
-
-_err:
-  tsdbFreeBufBlock(pBufBlock);
-  return NULL;
 }
 
-static void tsdbFreeBufBlock(STsdbBufBlock *pBufBlock) { tfree(pBufBlock); }
+ void tsdbFreeBufBlock(STsdbBufBlock *pBufBlock) { tfree(pBufBlock); }
 
 int tsdbExpandPool(STsdbRepo* pRepo, int32_t oldTotalBlocks) {
   if (oldTotalBlocks == pRepo->config.totalBlocks) {
@@ -193,10 +199,16 @@ err:
   return err;
 }
 
-void tsdbRecycleBufferBlock(STsdbBufPool* pPool, SListNode *pNode) {
+void tsdbRecycleBufferBlock(STsdbBufPool* pPool, SListNode *pNode, bool bELastic) {
   STsdbBufBlock *pBufBlock = NULL;
   tdListNodeGetData(pPool->bufBlockList, pNode, (void *)(&pBufBlock));
   tsdbFreeBufBlock(pBufBlock);
   free(pNode);
-  pPool->nBufBlocks--;
-}
+  if(bELastic)
+  {
+    pPool->nElasticBlocks--;
+    tsdbWarn("pPool=%p elastic block reduce one . nElasticBlocks=%d cur free Blocks=%d", pPool, pPool->nElasticBlocks, pPool->bufBlockList->numOfEles);
+  }
+  else
+    pPool->nBufBlocks--;
+}
\ No newline at end of file
diff --git a/src/tsdb/src/tsdbHealth.c b/src/tsdb/src/tsdbHealth.c
new file mode 100644
index 0000000000000000000000000000000000000000..8198c480334912b1ce373ceca7b82409f5a644f2
--- /dev/null
+++ b/src/tsdb/src/tsdbHealth.c
@@ -0,0 +1,98 @@
+/*
+ * 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/>.
+ */
+
+#include "os.h"
+#include "taosmsg.h"
+#include "tarray.h"
+#include "query.h"
+#include "tglobal.h"
+#include "tlist.h"
+#include "tsdbint.h"
+#include "tsdbBuffer.h"
+#include "tsdbLog.h"
+#include "tsdbHealth.h"
+#include "ttimer.h"
+#include "tthread.h"
+
+
+// return malloc new block count 
+int32_t tsdbInsertNewBlock(STsdbRepo * pRepo) {
+  STsdbBufPool *pPool = pRepo->pPool;
+  int32_t cnt = 0;
+
+  if(tsdbAllowNewBlock(pRepo)) {
+    STsdbBufBlock *pBufBlock = tsdbNewBufBlock(pPool->bufBlockSize);
+    if (pBufBlock) {
+        if (tdListAppend(pPool->bufBlockList, (void *)(&pBufBlock)) < 0) {
+          // append error
+          tsdbFreeBufBlock(pBufBlock);
+        } else {
+          pPool->nElasticBlocks ++;
+          cnt ++ ;
+        }
+    }
+ } 
+ return cnt;
+}
+
+// switch anther thread to run
+void* cbKillQueryFree(void* param) {
+  STsdbRepo* pRepo =  (STsdbRepo*)param;
+  // vnode
+  if(pRepo->appH.notifyStatus) {
+    pRepo->appH.notifyStatus(pRepo->appH.appH, TSDB_STATUS_COMMIT_NOBLOCK, TSDB_CODE_SUCCESS);
+  }
+
+  // free 
+  if(pRepo->pthread){
+    void* p = pRepo->pthread;
+    pRepo->pthread = NULL;
+    free(p);
+  }
+
+  return NULL;
+}
+
+// return true do free , false do nothing
+bool tsdbUrgeQueryFree(STsdbRepo * pRepo) {
+  // check previous running
+  if(pRepo->pthread && taosThreadRunning(pRepo->pthread)) {
+    tsdbWarn("vgId:%d pre urge thread is runing. nBlocks=%d nElasticBlocks=%d", REPO_ID(pRepo), pRepo->pPool->nBufBlocks, pRepo->pPool->nElasticBlocks);
+    return false;
+  }
+  // create new
+  pRepo->pthread = taosCreateThread(cbKillQueryFree, pRepo);
+  if(pRepo->pthread == NULL) {
+    tsdbError("vgId:%d create urge thread error.", REPO_ID(pRepo));
+    return false;
+  }
+  return true;
+}
+
+bool tsdbAllowNewBlock(STsdbRepo* pRepo) {
+  int32_t nMaxElastic = pRepo->config.totalBlocks/3;
+  STsdbBufPool* pPool = pRepo->pPool;
+  if(pPool->nElasticBlocks >= nMaxElastic) {
+    tsdbWarn("vgId:%d tsdbAllowNewBlock return fasle. nElasticBlock(%d) >= MaxElasticBlocks(%d)", REPO_ID(pRepo), pPool->nElasticBlocks, nMaxElastic);
+    return false;
+  }
+  return true;
+}
+
+bool tsdbNoProblem(STsdbRepo* pRepo) {
+  if(listNEles(pRepo->pPool->bufBlockList) == 0) 
+     return false;
+  return true;
+}
\ No newline at end of file
diff --git a/src/tsdb/src/tsdbMain.c b/src/tsdb/src/tsdbMain.c
index b2e6fe89161d0e9bceaf74a46807f51ec402fb2a..c2021963e0d0c8be4ed42588549153dcd20be63c 100644
--- a/src/tsdb/src/tsdbMain.c
+++ b/src/tsdb/src/tsdbMain.c
@@ -16,6 +16,8 @@
 // no test file errors here
 #include "taosdef.h"
 #include "tsdbint.h"
+#include "ttimer.h"
+#include "tthread.h"
 
 #define IS_VALID_PRECISION(precision) \
   (((precision) >= TSDB_TIME_PRECISION_MILLI) && ((precision) <= TSDB_TIME_PRECISION_NANO))
@@ -126,6 +128,10 @@ int tsdbCloseRepo(STsdbRepo *repo, int toCommit) {
   terrno = TSDB_CODE_SUCCESS;
 
   tsdbStopStream(pRepo);
+  if(pRepo->pthread){
+    taosDestoryThread(pRepo->pthread);
+    pRepo->pthread = NULL;
+  }
 
   if (toCommit) {
     tsdbSyncCommit(repo);
@@ -547,6 +553,7 @@ static STsdbRepo *tsdbNewRepo(STsdbCfg *pCfg, STsdbAppH *pAppH) {
     pRepo->appH = *pAppH;
   }
   pRepo->repoLocked = false;
+  pRepo->pthread = NULL;
 
   int code = pthread_mutex_init(&(pRepo->mutex), NULL);
   if (code != 0) {
diff --git a/src/tsdb/src/tsdbMemTable.c b/src/tsdb/src/tsdbMemTable.c
index e766d97a97a5905db87691426d282a219eef9d68..3890dca5b96c26009dcf3ca72205ca4b1725aa29 100644
--- a/src/tsdb/src/tsdbMemTable.c
+++ b/src/tsdb/src/tsdbMemTable.c
@@ -99,17 +99,22 @@ int tsdbUnRefMemTable(STsdbRepo *pRepo, SMemTable *pMemTable) {
     STsdbBufPool *pBufPool = pRepo->pPool;
 
     SListNode *pNode = NULL;
-    bool recycleBlocks = pBufPool->nRecycleBlocks > 0;
+    bool addNew = false;
     if (tsdbLockRepo(pRepo) < 0) return -1;
     while ((pNode = tdListPopHead(pMemTable->bufBlockList)) != NULL) {
       if (pBufPool->nRecycleBlocks > 0) {
-        tsdbRecycleBufferBlock(pBufPool, pNode);
+        tsdbRecycleBufferBlock(pBufPool, pNode, false);
         pBufPool->nRecycleBlocks -= 1;
       } else {
-        tdListAppendNode(pBufPool->bufBlockList, pNode);
+        if(pBufPool->nElasticBlocks > 0 && listNEles(pBufPool->bufBlockList) > 2) {
+          tsdbRecycleBufferBlock(pBufPool, pNode, true);
+        } else {
+          tdListAppendNode(pBufPool->bufBlockList, pNode);
+          addNew = true;
+        }
       }      
     }
-    if (!recycleBlocks) {
+    if (addNew) {
       int code = pthread_cond_signal(&pBufPool->poolNotEmpty);
       if (code != 0) {
         if (tsdbUnlockRepo(pRepo) < 0) return -1;
diff --git a/src/util/inc/tcache.h b/src/util/inc/tcache.h
index e41b544d00e55f7eece904c5957ef9c06063e6c3..40069d7d273caa14ce3b80467b25d68ea476fb75 100644
--- a/src/util/inc/tcache.h
+++ b/src/util/inc/tcache.h
@@ -33,6 +33,7 @@ extern "C" {
 #endif
 
 typedef void (*__cache_free_fn_t)(void*);
+typedef void (*__cache_trav_fn_t)(void*, void*);
 
 typedef struct SCacheStatis {
   int64_t missCount;
@@ -176,7 +177,7 @@ void taosCacheCleanup(SCacheObj *pCacheObj);
  * @param fp
  * @return
  */
-void taosCacheRefresh(SCacheObj *pCacheObj, __cache_free_fn_t fp);
+void taosCacheRefresh(SCacheObj *pCacheObj, __cache_trav_fn_t fp, void* param1);
 
 /**
  * stop background refresh worker thread
diff --git a/src/util/inc/tconfig.h b/src/util/inc/tconfig.h
index d03ce6e0f1f34478951a84b2ab18020f5cbec92b..462b23697f91e0c32464764bddeda68c8c6398ee 100644
--- a/src/util/inc/tconfig.h
+++ b/src/util/inc/tconfig.h
@@ -20,7 +20,7 @@
 extern "C" {
 #endif
 
-#define TSDB_CFG_MAX_NUM    116  // 110 + 6 with lossy option
+#define TSDB_CFG_MAX_NUM    122
 #define TSDB_CFG_PRINT_LEN  23
 #define TSDB_CFG_OPTION_LEN 24
 #define TSDB_CFG_VALUE_LEN  41
diff --git a/src/util/inc/tthread.h b/src/util/inc/tthread.h
new file mode 100644
index 0000000000000000000000000000000000000000..7443ad706dcbef529d857fe823cddd0cc1efbdd3
--- /dev/null
+++ b/src/util/inc/tthread.h
@@ -0,0 +1,37 @@
+/*
+ * 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 TDENGINE_TTHREAD_H
+#define TDENGINE_TTHREAD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "os.h"
+#include "taosdef.h"
+
+// create new thread
+pthread_t* taosCreateThread( void *(*__start_routine) (void *), void* param);
+// destory thread 
+bool taosDestoryThread(pthread_t* pthread);
+// thread running return true
+bool taosThreadRunning(pthread_t* pthread);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // TDENGINE_TTHREAD_H
diff --git a/src/util/src/tcache.c b/src/util/src/tcache.c
index 6665c25a90a7fcb0db83766b88c9c9c7fe047fbf..589d3d4fa57c42b472319673a72d2e7ab599689f 100644
--- a/src/util/src/tcache.c
+++ b/src/util/src/tcache.c
@@ -505,7 +505,8 @@ void taosCacheRelease(SCacheObj *pCacheObj, void **data, bool _remove) {
 typedef struct SHashTravSupp {
   SCacheObj* pCacheObj;
   int64_t    time;
-  __cache_free_fn_t fp;
+  __cache_trav_fn_t fp;
+  void* param1;
 } SHashTravSupp;
 
 static bool travHashTableEmptyFn(void* param, void* data) {
@@ -667,17 +668,17 @@ bool travHashTableFn(void* param, void* data) {
   }
 
   if (ps->fp) {
-    (ps->fp)(pNode->data);
+    (ps->fp)(pNode->data, ps->param1);
   }
 
   // do not remove element in hash table
   return true;
 }
 
-static void doCacheRefresh(SCacheObj* pCacheObj, int64_t time, __cache_free_fn_t fp) {
+static void doCacheRefresh(SCacheObj* pCacheObj, int64_t time, __cache_trav_fn_t fp, void* param1) {
   assert(pCacheObj != NULL);
 
-  SHashTravSupp sup = {.pCacheObj = pCacheObj, .fp = fp, .time = time};
+  SHashTravSupp sup = {.pCacheObj = pCacheObj, .fp = fp, .time = time, .param1 = param1};
   taosHashCondTraverse(pCacheObj->pHashTable, travHashTableFn, &sup);
 }
 
@@ -748,7 +749,7 @@ void* taosCacheTimedRefresh(void *handle) {
       // refresh data in hash table
       if (elemInHash > 0) {
         int64_t now = taosGetTimestampMs();
-        doCacheRefresh(pCacheObj, now, NULL);
+        doCacheRefresh(pCacheObj, now, NULL, NULL);
       }
 
       taosTrashcanEmpty(pCacheObj, false);
@@ -766,13 +767,13 @@ void* taosCacheTimedRefresh(void *handle) {
   return NULL;
 }
 
-void taosCacheRefresh(SCacheObj *pCacheObj, __cache_free_fn_t fp) {
+void taosCacheRefresh(SCacheObj *pCacheObj, __cache_trav_fn_t fp, void* param1) {
   if (pCacheObj == NULL) {
     return;
   }
 
   int64_t now = taosGetTimestampMs();
-  doCacheRefresh(pCacheObj, now, fp);
+  doCacheRefresh(pCacheObj, now, fp, param1);
 }
 
 void taosStopCacheRefreshWorker(void) {
diff --git a/src/util/src/tthread.c b/src/util/src/tthread.c
new file mode 100644
index 0000000000000000000000000000000000000000..043b2de2f241297d209041294428dde2c55e974e
--- /dev/null
+++ b/src/util/src/tthread.c
@@ -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/>.
+ */
+
+#include "os.h"
+#include "tthread.h"
+#include "tglobal.h"
+#include "taosdef.h"
+#include "tutil.h"
+#include "tulog.h"
+#include "taoserror.h"
+
+// create new thread
+pthread_t* taosCreateThread( void *(*__start_routine) (void *), void* param) {
+  pthread_t* pthread = (pthread_t*)malloc(sizeof(pthread_t));
+  pthread_attr_t thattr;
+  pthread_attr_init(&thattr);
+  pthread_attr_setdetachstate(&thattr, PTHREAD_CREATE_JOINABLE);
+  int32_t ret = pthread_create(pthread, &thattr, __start_routine, param);
+  pthread_attr_destroy(&thattr);
+
+  if (ret != 0) {
+    free(pthread);
+    return NULL;
+  }
+  return pthread;
+}
+
+// destory thread 
+bool taosDestoryThread(pthread_t* pthread) {
+  if(pthread == NULL) return false;
+  if(taosThreadRunning(pthread)) {
+    pthread_cancel(*pthread);
+    pthread_join(*pthread, NULL);
+  }
+  
+  free(pthread);
+  return true;
+}
+
+// thread running return true
+bool taosThreadRunning(pthread_t* pthread) {
+  if(pthread == NULL) return false;
+  int ret = pthread_kill(*pthread, 0);
+  if(ret == ESRCH)
+    return false;
+  if(ret == EINVAL) 
+    return false;   
+  // alive
+  return true;
+}
diff --git a/src/vnode/src/vnodeMain.c b/src/vnode/src/vnodeMain.c
index f826c1aecd336a0eedeb3f02df0a7acc61895bb2..c823880ae2028c4bcfe26dbfc5cd60af62443722 100644
--- a/src/vnode/src/vnodeMain.c
+++ b/src/vnode/src/vnodeMain.c
@@ -560,5 +560,10 @@ static int32_t vnodeProcessTsdbStatus(void *arg, int32_t status, int32_t eno) {
     return vnodeSaveVersion(pVnode);
   }
 
+  // timer thread callback
+  if(status == TSDB_STATUS_COMMIT_NOBLOCK) {
+    qSolveCommitNoBlock(pVnode->tsdb, pVnode->qMgmt);
+  }
+
   return 0;
 }
diff --git a/tests/pytest/functions/showOfflineThresholdIs864000.py b/tests/pytest/functions/showOfflineThresholdIs864000.py
index 8ec25cef26b3c97bc55f2f4df3fe8cf55a19125c..7462d4cd72f600674fcb82aa1224019787d23fd5 100644
--- a/tests/pytest/functions/showOfflineThresholdIs864000.py
+++ b/tests/pytest/functions/showOfflineThresholdIs864000.py
@@ -12,6 +12,8 @@
 # -*- coding: utf-8 -*-
 
 import sys
+import numpy as np
+
 from util.log import *
 from util.cases import *
 from util.sql import *
@@ -24,8 +26,17 @@ class TDTestCase:
         tdSql.init(conn.cursor(), logSql)
 
     def run(self):
+        # tdSql.query("show variables")
+        # tdSql.checkData(54, 1, 864000)
+        tdSql.execute("show variables")
+        res = tdSql.cursor.fetchall()
+        resList = np.array(res)
+        index = np.where(resList == "offlineThreshold")
+        index_value = np.dstack((index[0])).squeeze()
         tdSql.query("show variables")
-        tdSql.checkData(55, 1, 864000)
+        tdSql.checkData(index_value, 1, 864000)
+        pass
+
 
     def stop(self):
         tdSql.close()