From 12b961c7f5905686b57434a6e1e41b0fa9881ebe Mon Sep 17 00:00:00 2001
From: dapan1121 <wpan@taosdata.com>
Date: Thu, 14 Jul 2022 18:42:26 +0800
Subject: [PATCH] enh: add schedule policy

---
 include/libs/scheduler/scheduler.h    |  9 +-------
 source/client/src/clientImpl.c        |  1 +
 source/libs/command/CMakeLists.txt    |  4 ++--
 source/libs/command/src/command.c     |  2 ++
 source/libs/qworker/inc/qwInt.h       |  1 +
 source/libs/qworker/src/qwDbg.c       | 13 ++++++-----
 source/libs/qworker/src/qwMsg.c       |  2 +-
 source/libs/qworker/src/qworker.c     |  2 ++
 source/libs/scheduler/inc/schInt.h    | 14 ++++++++++--
 source/libs/scheduler/src/schJob.c    | 26 ++++++++++++++--------
 source/libs/scheduler/src/schTask.c   | 31 ++++++++++++++++-----------
 source/libs/scheduler/src/scheduler.c |  2 +-
 source/libs/transport/src/transCli.c  |  1 +
 source/util/src/terror.c              |  2 +-
 14 files changed, 66 insertions(+), 44 deletions(-)

diff --git a/include/libs/scheduler/scheduler.h b/include/libs/scheduler/scheduler.h
index 1b664d4ac5..e6973cd390 100644
--- a/include/libs/scheduler/scheduler.h
+++ b/include/libs/scheduler/scheduler.h
@@ -25,13 +25,6 @@ extern "C" {
 
 extern tsem_t schdRspSem;
 
-typedef struct SSchedulerCfg {
-  uint32_t   maxJobNum;
-  int32_t    maxNodeTableNum;
-  SCH_POLICY schPolicy;
-  bool       enableReSchedule;
-} SSchedulerCfg;
-
 typedef struct SQueryProfileSummary {
   int64_t startTs;      // Object created and added into the message queue
   int64_t endTs;        // the timestamp when the task is completed
@@ -86,7 +79,7 @@ typedef struct SSchedulerReq {
 } SSchedulerReq;
 
 
-int32_t schedulerInit(SSchedulerCfg *cfg);
+int32_t schedulerInit(void);
 
 int32_t schedulerExecJob(SSchedulerReq *pReq, int64_t *pJob);
 
diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index 32c11983c2..87b94af392 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -834,6 +834,7 @@ void schedulerExecCb(SExecResult* pResult, void* param, int32_t code) {
     tscDebug("0x%" PRIx64 " client retry to handle the error, code:%d - %s, tryCount:%d, reqId:0x%" PRIx64,
              pRequest->self, code, tstrerror(code), pRequest->retry, pRequest->requestId);
     pRequest->prevCode = code;
+    schedulerFreeJob(&pRequest->body.queryJob, 0);
     doAsyncQuery(pRequest, true);
     return;
   }
diff --git a/source/libs/command/CMakeLists.txt b/source/libs/command/CMakeLists.txt
index 51118f4a34..a890972d14 100644
--- a/source/libs/command/CMakeLists.txt
+++ b/source/libs/command/CMakeLists.txt
@@ -8,9 +8,9 @@ target_include_directories(
 
 target_link_libraries(
         command
-        PRIVATE os util nodes catalog function transport qcom
+        PRIVATE os util nodes catalog function transport qcom scheduler
 )
 
 if(${BUILD_TEST})
     ADD_SUBDIRECTORY(test)
-endif(${BUILD_TEST})
\ No newline at end of file
+endif(${BUILD_TEST})
diff --git a/source/libs/command/src/command.c b/source/libs/command/src/command.c
index 94d19be0a4..d22b3d88b4 100644
--- a/source/libs/command/src/command.c
+++ b/source/libs/command/src/command.c
@@ -17,6 +17,8 @@
 #include "catalog.h"
 #include "tdatablock.h"
 #include "tglobal.h"
+#include "commandInt.h"
+#include "scheduler.h"
 
 extern SConfig* tsCfg;
 
diff --git a/source/libs/qworker/inc/qwInt.h b/source/libs/qworker/inc/qwInt.h
index 539643c390..d8d7c5a0ea 100644
--- a/source/libs/qworker/inc/qwInt.h
+++ b/source/libs/qworker/inc/qwInt.h
@@ -378,6 +378,7 @@ void qwDbgDumpMgmtInfo(SQWorker *mgmt);
 int32_t qwDbgValidateStatus(QW_FPARAMS_DEF, int8_t oriStatus, int8_t newStatus, bool *ignore);
 int32_t qwDbgBuildAndSendRedirectRsp(int32_t rspType, SRpcHandleInfo *pConn, int32_t code, SEpSet *pEpSet);
 int32_t qwAddTaskCtx(QW_FPARAMS_DEF);
+int32_t qwDbgResponseRedirect(SQWMsg *qwMsg, SQWTaskCtx *ctx);
 
 
 #ifdef __cplusplus
diff --git a/source/libs/qworker/src/qwDbg.c b/source/libs/qworker/src/qwDbg.c
index 869eedf8f6..fa63cf2c3a 100644
--- a/source/libs/qworker/src/qwDbg.c
+++ b/source/libs/qworker/src/qwDbg.c
@@ -9,7 +9,7 @@
 #include "tmsg.h"
 #include "tname.h"
 
-SQWDebug     gQWDebug = {.statusEnable = true, .dumpEnable = false, .tmp = true};
+SQWDebug     gQWDebug = {.statusEnable = true, .dumpEnable = false, .tmp = false};
 
 int32_t qwDbgValidateStatus(QW_FPARAMS_DEF, int8_t oriStatus, int8_t newStatus, bool *ignore) {
   if (!gQWDebug.statusEnable) {
@@ -147,9 +147,9 @@ int32_t qwDbgBuildAndSendRedirectRsp(int32_t rspType, SRpcHandleInfo *pConn, int
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t qwDbgResponseREdirect(SQWMsg *qwMsg, SQWTaskCtx *ctx) {
+int32_t qwDbgResponseRedirect(SQWMsg *qwMsg, SQWTaskCtx *ctx) {
   if (gQWDebug.tmp) {
-    if (TDMT_SCH_QUERY == qwMsg->msgType) {
+    if (TDMT_SCH_QUERY == qwMsg->msgType && (0 == taosRand() % 3)) {
       SEpSet epSet = {0};
       epSet.inUse = 1;
       epSet.numOfEps = 3;
@@ -159,16 +159,15 @@ int32_t qwDbgResponseREdirect(SQWMsg *qwMsg, SQWTaskCtx *ctx) {
       epSet.eps[1].port = 7200;
       strcpy(epSet.eps[2].fqdn, "localhost");
       epSet.eps[2].port = 7300;
-      
+
+      ctx->phase = QW_PHASE_POST_QUERY;      
       qwDbgBuildAndSendRedirectRsp(qwMsg->msgType + 1, &qwMsg->connInfo, TSDB_CODE_RPC_REDIRECT, &epSet);
-      gQWDebug.tmp = false;
       return TSDB_CODE_SUCCESS;
     }
     
-    if (TDMT_SCH_MERGE_QUERY == qwMsg->msgType) {
+    if (TDMT_SCH_MERGE_QUERY == qwMsg->msgType && (0 == taosRand() % 3)) {
       ctx->phase = QW_PHASE_POST_QUERY;
       qwDbgBuildAndSendRedirectRsp(qwMsg->msgType + 1, &qwMsg->connInfo, TSDB_CODE_RPC_REDIRECT, NULL);
-      gQWDebug.tmp = false;
       return TSDB_CODE_SUCCESS;
     }
   }
diff --git a/source/libs/qworker/src/qwMsg.c b/source/libs/qworker/src/qwMsg.c
index b937c44810..93268e1bcc 100644
--- a/source/libs/qworker/src/qwMsg.c
+++ b/source/libs/qworker/src/qwMsg.c
@@ -315,7 +315,7 @@ int32_t qWorkerPreprocessQueryMsg(void *qWorkerMgmt, SRpcMsg *pMsg) {
   int64_t  rId = msg->refId;
   int32_t  eId = msg->execId;
 
-  SQWMsg qwMsg = {.msg = msg->msg + msg->sqlLen, .msgLen = msg->phyLen, .connInfo = pMsg->info};
+  SQWMsg qwMsg = {.msgType = pMsg->msgType, .msg = msg->msg + msg->sqlLen, .msgLen = msg->phyLen, .connInfo = pMsg->info};
 
   QW_SCH_TASK_DLOG("prerocessQuery start, handle:%p", pMsg->info.handle);
   QW_ERR_RET(qwPreprocessQuery(QW_FPARAMS(), &qwMsg));
diff --git a/source/libs/qworker/src/qworker.c b/source/libs/qworker/src/qworker.c
index b22729fb9c..1b58dc2824 100644
--- a/source/libs/qworker/src/qworker.c
+++ b/source/libs/qworker/src/qworker.c
@@ -488,6 +488,8 @@ int32_t qwPreprocessQuery(QW_FPARAMS_DEF, SQWMsg *qwMsg) {
 
   QW_ERR_JRET(qwAddTaskStatus(QW_FPARAMS(), JOB_TASK_STATUS_INIT));
 
+  qwDbgResponseRedirect(qwMsg, ctx);
+
 _return:
 
   if (ctx) {
diff --git a/source/libs/scheduler/inc/schInt.h b/source/libs/scheduler/inc/schInt.h
index ef817a557c..7979db081b 100644
--- a/source/libs/scheduler/inc/schInt.h
+++ b/source/libs/scheduler/inc/schInt.h
@@ -135,6 +135,13 @@ typedef struct SSchStatusFps {
   schStatusEventFp eventFp;
 } SSchStatusFps;
 
+typedef struct SSchedulerCfg {
+  uint32_t   maxJobNum;
+  int32_t    maxNodeTableNum;
+  SCH_POLICY schPolicy;
+  bool       enableReSchedule;
+} SSchedulerCfg;
+
 typedef struct SSchedulerMgmt {
   uint64_t        taskId; // sequential taksId
   uint64_t        sId;    // schedulerId
@@ -275,7 +282,7 @@ typedef struct SSchJob {
 
 extern SSchedulerMgmt schMgmt;
 
-#define SCH_TASK_TIMEOUT(_task) ((taosGetTimestampUs() - (_task)->profile.execTime[(_task)->execId % (_task)->maxExecTimes]) > (_task)->timeoutUsec)
+#define SCH_TASK_TIMEOUT(_task) ((taosGetTimestampUs() - *(int64_t*)taosArrayGet((_task)->profile.execTime, (_task)->execId)) > (_task)->timeoutUsec)
 
 #define SCH_TASK_READY_FOR_LAUNCH(readyNum, task) ((readyNum) >= taosArrayGetSize((task)->children))
 
@@ -479,9 +486,12 @@ void    schFreeTask(SSchJob *pJob, SSchTask *pTask);
 void    schDropTaskInHashList(SSchJob *pJob, SHashObj *list);
 int32_t schLaunchLevelTasks(SSchJob *pJob, SSchLevel *level);
 int32_t schGetTaskFromList(SHashObj *pTaskList, uint64_t taskId, SSchTask **pTask);
-int32_t schInitTask(SSchJob *pJob, SSchTask *pTask, SSubplan *pPlan, SSchLevel *pLevel, int32_t levelNum);
+int32_t schInitTask(SSchJob *pJob, SSchTask *pTask, SSubplan *pPlan, SSchLevel *pLevel);
 int32_t schSwitchTaskCandidateAddr(SSchJob *pJob, SSchTask *pTask);
 void    schDirectPostJobRes(SSchedulerReq* pReq, int32_t errCode);
+int32_t schHandleJobFailure(SSchJob *pJob, int32_t errCode);
+int32_t schHandleJobDrop(SSchJob *pJob, int32_t errCode);
+
 
 extern SSchDebug gSCHDebug;
 
diff --git a/source/libs/scheduler/src/schJob.c b/source/libs/scheduler/src/schJob.c
index e482814ee7..f1799b04c7 100644
--- a/source/libs/scheduler/src/schJob.c
+++ b/source/libs/scheduler/src/schJob.c
@@ -343,7 +343,7 @@ int32_t schValidateAndBuildJob(SQueryPlan *pDag, SSchJob *pJob) {
         SCH_ERR_JRET(TSDB_CODE_QRY_OUT_OF_MEMORY);
       }
 
-      SCH_ERR_JRET(schInitTask(pJob, pTask, plan, pLevel, levelNum));
+      SCH_ERR_JRET(schInitTask(pJob, pTask, plan, pLevel));
 
       SCH_ERR_JRET(schAppendJobDataSrc(pJob, pTask));
 
@@ -464,7 +464,7 @@ void schPostJobRes(SSchJob *pJob, SCH_OP_TYPE op) {
   }
 }
 
-int32_t schProcessOnJobFailureImpl(SSchJob *pJob, int32_t status, int32_t errCode) {
+int32_t schProcessOnJobFailure(SSchJob *pJob, int32_t errCode) {
   schUpdateJobErrCode(pJob, errCode);
   
   int32_t code = atomic_load_32(&pJob->errCode);
@@ -477,21 +477,29 @@ int32_t schProcessOnJobFailureImpl(SSchJob *pJob, int32_t status, int32_t errCod
   SCH_RET(TSDB_CODE_SCH_IGNORE_ERROR);
 }
 
-// Note: no more task error processing, handled in function internal
-int32_t schProcessOnJobFailure(SSchJob *pJob, int32_t errCode) {
+int32_t schHandleJobFailure(SSchJob *pJob, int32_t errCode) {
   if (TSDB_CODE_SCH_IGNORE_ERROR == errCode) {
     return TSDB_CODE_SCH_IGNORE_ERROR;
   }
 
-  schProcessOnJobFailureImpl(pJob, JOB_TASK_STATUS_FAIL, errCode);
+  schSwitchJobStatus(pJob, JOB_TASK_STATUS_FAIL, &errCode);
   return TSDB_CODE_SCH_IGNORE_ERROR;
 }
 
-// Note: no more error processing, handled in function internal
 int32_t schProcessOnJobDropped(SSchJob *pJob, int32_t errCode) {
-  SCH_RET(schProcessOnJobFailureImpl(pJob, JOB_TASK_STATUS_DROP, errCode));
+  SCH_RET(schProcessOnJobFailure(pJob, errCode));
+}
+
+int32_t schHandleJobDrop(SSchJob *pJob, int32_t errCode) {
+  if (TSDB_CODE_SCH_IGNORE_ERROR == errCode) {
+    return TSDB_CODE_SCH_IGNORE_ERROR;
+  }
+
+  schSwitchJobStatus(pJob, JOB_TASK_STATUS_DROP, &errCode);
+  return TSDB_CODE_SCH_IGNORE_ERROR;
 }
 
+
 int32_t schProcessOnJobPartialSuccess(SSchJob *pJob) {
   schPostJobRes(pJob, SCH_OP_EXEC);
 
@@ -804,7 +812,7 @@ void schProcessOnOpEnd(SSchJob *pJob, SCH_OP_TYPE type, SSchedulerReq* pReq, int
   }
 
   if (errCode) {
-    schSwitchJobStatus(pJob, JOB_TASK_STATUS_FAIL, (void*)&errCode);
+    schHandleJobFailure(pJob, errCode);
   }
 
   SCH_JOB_DLOG("job end %s operation with code %s", schGetOpStr(type), tstrerror(errCode));
@@ -877,7 +885,7 @@ void schProcessOnCbEnd(SSchJob *pJob, SSchTask *pTask, int32_t errCode) {
   }
 
   if (errCode) {
-    schSwitchJobStatus(pJob, JOB_TASK_STATUS_FAIL, (void*)&errCode);
+    schHandleJobFailure(pJob, errCode);
   }
   
   if (pJob) {
diff --git a/source/libs/scheduler/src/schTask.c b/source/libs/scheduler/src/schTask.c
index ebe4bcab7b..9226ea25c9 100644
--- a/source/libs/scheduler/src/schTask.c
+++ b/source/libs/scheduler/src/schTask.c
@@ -45,7 +45,7 @@ void schFreeTask(SSchJob *pJob, SSchTask *pTask) {
   taosArrayDestroy(pTask->profile.execTime);
 }
 
-void schInitTaskRetryTimes(SSchJob *pJob, SSchTask *pTask, SSchLevel *pLevel, int32_t levelNum) {
+void schInitTaskRetryTimes(SSchJob *pJob, SSchTask *pTask, SSchLevel *pLevel) {
   if (SCH_IS_DATA_BIND_TASK(pTask) || (!SCH_IS_QUERY_JOB(pJob)) || (SCH_ALL != schMgmt.cfg.schPolicy)) {
     pTask->maxRetryTimes = SCH_MAX_CANDIDATE_EP_NUM;
   } else {
@@ -53,10 +53,10 @@ void schInitTaskRetryTimes(SSchJob *pJob, SSchTask *pTask, SSchLevel *pLevel, in
     pTask->maxRetryTimes = TMAX(nodeNum, SCH_MAX_CANDIDATE_EP_NUM);
   }
   
-  pTask->maxExecTimes = pTask->maxRetryTimes * (levelNum - pLevel->level);
+  pTask->maxExecTimes = pTask->maxRetryTimes * (pLevel->level + 1);
 }
 
-int32_t schInitTask(SSchJob *pJob, SSchTask *pTask, SSubplan *pPlan, SSchLevel *pLevel, int32_t levelNum) {
+int32_t schInitTask(SSchJob *pJob, SSchTask *pTask, SSubplan *pPlan, SSchLevel *pLevel) {
   int32_t code = 0;
 
   pTask->plan = pPlan;
@@ -67,7 +67,7 @@ int32_t schInitTask(SSchJob *pJob, SSchTask *pTask, SSubplan *pPlan, SSchLevel *
   pTask->execNodes =
       taosHashInit(SCH_MAX_CANDIDATE_EP_NUM, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_NO_LOCK);
 
-  schInitTaskRetryTimes(pJob, pTask, pLevel, levelNum);
+  schInitTaskRetryTimes(pJob, pTask, pLevel);
 
   pTask->profile.execTime = taosArrayInit(pTask->maxExecTimes, sizeof(int64_t));
   if (NULL == pTask->execNodes || NULL == pTask->profile.execTime) {
@@ -76,6 +76,8 @@ int32_t schInitTask(SSchJob *pJob, SSchTask *pTask, SSubplan *pPlan, SSchLevel *
 
   SCH_SET_TASK_STATUS(pTask, JOB_TASK_STATUS_INIT);
 
+  SCH_TASK_DLOG("task initialized, max times %d:%d", pTask->maxRetryTimes, pTask->maxExecTimes);
+
   return TSDB_CODE_SUCCESS;
 
 _return:
@@ -118,7 +120,7 @@ int32_t schDropTaskExecNode(SSchJob *pJob, SSchTask *pTask, void *handle, int32_
   }
 
   if (taosHashRemove(pTask->execNodes, &execId, sizeof(execId))) {
-    SCH_TASK_ELOG("fail to remove execId %d from execNodeList", execId);
+    SCH_TASK_DLOG("execId %d already not in execNodeList", execId);
   } else {
     SCH_TASK_DLOG("execId %d removed from execNodeList", execId);
   }
@@ -248,7 +250,7 @@ int32_t schProcessOnTaskSuccess(SSchJob *pJob, SSchTask *pTask) {
       }
 
       if (pTask->level->taskFailed > 0) {
-        SCH_RET(schSwitchJobStatus(pJob, JOB_TASK_STATUS_FAIL, NULL));
+        SCH_RET(schHandleJobFailure(pJob, pJob->errCode));
       } else {
         SCH_RET(schSwitchJobStatus(pJob, JOB_TASK_STATUS_PART_SUCC, NULL));
       }
@@ -321,13 +323,17 @@ int32_t schRescheduleTask(SSchJob *pJob, SSchTask *pTask) {
 int32_t schDoTaskRedirect(SSchJob *pJob, SSchTask *pTask, SDataBuf *pData, int32_t rspCode) {
   int32_t code = 0;
 
-  if ((pTask->execId + 1) >= pTask->maxExecTimes) {
-    SCH_TASK_DLOG("task no more retry since reach max try times, execId:%d", pTask->execId);
-    schSwitchJobStatus(pJob, JOB_TASK_STATUS_FAIL, (void *)&rspCode);
-    return TSDB_CODE_SUCCESS;
+  SCH_TASK_DLOG("task will be redirected now, status:%s", SCH_GET_TASK_STATUS_STR(pTask));
+
+  if (NULL == pData) {
+    pTask->retryTimes = 0;
   }
 
-  SCH_TASK_DLOG("task will be redirected now, status:%s", SCH_GET_TASK_STATUS_STR(pTask));
+  if (((pTask->execId + 1) >= pTask->maxExecTimes) || ((pTask->retryTimes + 1) > pTask->maxRetryTimes)) {
+    SCH_TASK_DLOG("task no more retry since reach max times %d:%d, execId %d", pTask->maxRetryTimes, pTask->maxExecTimes, pTask->execId);
+    schHandleJobFailure(pJob, rspCode);
+    return TSDB_CODE_SUCCESS;
+  }
 
   schDropTaskOnExecNode(pJob, pTask);
   taosHashClear(pTask->execNodes);
@@ -337,7 +343,6 @@ int32_t schDoTaskRedirect(SSchJob *pJob, SSchTask *pTask, SDataBuf *pData, int32
   taosMemoryFreeClear(pTask->msg);
   pTask->msgLen = 0;
   pTask->lastMsgType = 0;
-  pTask->retryTimes = 0;
   memset(&pTask->succeedAddr, 0, sizeof(pTask->succeedAddr));
 
   if (SCH_IS_DATA_BIND_TASK(pTask)) {
@@ -784,7 +789,7 @@ int32_t schLaunchTaskImpl(SSchJob *pJob, SSchTask *pTask) {
   pTask->execId++;
   pTask->retryTimes++;
 
-  SCH_TASK_DLOG("start to launch task's %dth exec", pTask->execId);
+  SCH_TASK_DLOG("start to launch task, execId %d, retry %d", pTask->execId, pTask->retryTimes);
 
   SCH_LOG_TASK_START_TS(pTask);
 
diff --git a/source/libs/scheduler/src/scheduler.c b/source/libs/scheduler/src/scheduler.c
index 81c1ff9468..3a15523040 100644
--- a/source/libs/scheduler/src/scheduler.c
+++ b/source/libs/scheduler/src/scheduler.c
@@ -154,7 +154,7 @@ void schedulerFreeJob(int64_t* jobId, int32_t errCode) {
     return;
   }
 
-  schSwitchJobStatus(pJob, JOB_TASK_STATUS_DROP, (void*)&errCode);
+  schHandleJobDrop(pJob, errCode);
   
   schReleaseJob(*jobId);
   *jobId = 0;
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 5d087d5769..ac32f97258 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -753,6 +753,7 @@ static void cliHandleRelease(SCliMsg* pMsg, SCliThrd* pThrd) {
   SExHandle* exh = transAcquireExHandle(transGetRefMgt(), refId);
   if (exh == NULL) {
     tDebug("%" PRId64 " already release", refId);
+    return;
   }
 
   SCliConn* conn = exh->handle;
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index 2364c53a9a..95334b5535 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -135,7 +135,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_TSC_STMT_API_ERROR,           "Stmt API usage error"
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_STMT_TBNAME_ERROR,        "Stmt table name not set")
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_STMT_CLAUSE_ERROR,        "not supported stmt clause")
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_QUERY_KILLED,             "Query killed")
-TAOS_DEFINE_ERROR(TSDB_CODE_TSC_NO_EXEC_NODE,             "No available execution node")
+TAOS_DEFINE_ERROR(TSDB_CODE_TSC_NO_EXEC_NODE,             "No available execution node in current query policy configuration")
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_NOT_STABLE_ERROR,         "Table is not a super table")
 
 // mnode-common
-- 
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