TD-2165 add vnode cancel worker to process query msg

src/vnode/inc/vnodeCancel.h

+/*
+ * 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_VNODE_CANCEL_H
+#define TDENGINE_VNODE_CANCEL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include "vnode.h"
+#include "vnodeInt.h"
+
+int32_t vnodeInitCWorker();
+void    vnodeCleanupCWorker();
+int32_t vnodeWriteIntoCQueue(SVReadMsg *pRead);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/vnode/src/vnodeCancel.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 "os.h"
+#include "taoserror.h"
+#include "taosmsg.h"
+#include "tglobal.h"
+#include "tqueue.h"
+#include "dnode.h"
+#include "tsdb.h"
+#include "vnodeCancel.h"
+
+typedef struct {
+  pthread_t thread;
+  int32_t   workerId;
+} SVCWorker;
+
+typedef struct {
+  int32_t    curNum;
+  int32_t    maxNum;
+  SVCWorker *worker;
+} SVCWorkerPool;
+
+static SVCWorkerPool tsVCWorkerPool;
+static taos_qset     tsVCWorkerQset;
+static taos_queue    tsVCWorkerQueue;
+
+static void *vnodeCWorkerFunc(void *param);
+
+static int32_t vnodeStartCWorker() {
+  tsVCWorkerQueue = taosOpenQueue();
+  if (tsVCWorkerQueue == NULL) return TSDB_CODE_DND_OUT_OF_MEMORY;
+
+  taosAddIntoQset(tsVCWorkerQset, tsVCWorkerQueue, NULL);
+
+  for (int32_t i = tsVCWorkerPool.curNum; i < tsVCWorkerPool.maxNum; ++i) {
+    SVCWorker *pWorker = tsVCWorkerPool.worker + i;
+    pWorker->workerId = i;
+
+    pthread_attr_t thAttr;
+    pthread_attr_init(&thAttr);
+    pthread_attr_setdetachstate(&thAttr, PTHREAD_CREATE_JOINABLE);
+
+    if (pthread_create(&pWorker->thread, &thAttr, vnodeCWorkerFunc, pWorker) != 0) {
+      vError("failed to create thread to process vcworker queue, reason:%s", strerror(errno));
+    }
+
+    pthread_attr_destroy(&thAttr);
+
+    tsVCWorkerPool.curNum = i + 1;
+    vDebug("vcworker:%d is launched, total:%d", pWorker->workerId, tsVCWorkerPool.maxNum);
+  }
+
+  vDebug("vcworker queue:%p is allocated", tsVCWorkerQueue);
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t vnodeInitCWorker() {
+  tsVCWorkerQset = taosOpenQset();
+
+  tsVCWorkerPool.maxNum = 1;
+  tsVCWorkerPool.curNum = 0;
+  tsVCWorkerPool.worker = calloc(sizeof(SVCWorker), tsVCWorkerPool.maxNum);
+
+  if (tsVCWorkerPool.worker == NULL) return -1;
+  for (int32_t i = 0; i < tsVCWorkerPool.maxNum; ++i) {
+    SVCWorker *pWorker = tsVCWorkerPool.worker + i;
+    pWorker->workerId = i;
+    vDebug("vcworker:%d is created", i);
+  }
+
+  vDebug("vcworker is initialized, num:%d qset:%p", tsVCWorkerPool.maxNum, tsVCWorkerQset);
+
+  return vnodeStartCWorker();
+}
+
+static void vnodeStopCWorker() {
+  vDebug("vcworker queue:%p is freed", tsVCWorkerQueue);
+  taosCloseQueue(tsVCWorkerQueue);
+  tsVCWorkerQueue = NULL;
+}
+
+void vnodeCleanupCWorker() {
+  for (int32_t i = 0; i < tsVCWorkerPool.maxNum; ++i) {
+    SVCWorker *pWorker = tsVCWorkerPool.worker + i;
+    if (pWorker->thread) {
+      taosQsetThreadResume(tsVCWorkerQset);
+    }
+    vDebug("vcworker:%d is closed", i);
+  }
+
+  for (int32_t i = 0; i < tsVCWorkerPool.maxNum; ++i) {
+    SVCWorker *pWorker = tsVCWorkerPool.worker + i;
+    vDebug("vcworker:%d start to join", i);
+    if (pWorker->thread) {
+      pthread_join(pWorker->thread, NULL);
+    }
+    vDebug("vcworker:%d join success", i);
+  }
+
+  vDebug("vcworker is closed, qset:%p", tsVCWorkerQset);
+
+  taosCloseQset(tsVCWorkerQset);
+  tsVCWorkerQset = NULL;
+  tfree(tsVCWorkerPool.worker);
+
+  vnodeStopCWorker();
+}
+
+int32_t vnodeWriteIntoCQueue(SVReadMsg *pRead) {
+  vTrace("msg:%p, write into vcqueue", pRead);
+  return taosWriteQitem(tsVCWorkerQueue, pRead->qtype, pRead);
+}
+
+static void vnodeFreeFromCQueue(SVReadMsg *pRead) {
+  vTrace("msg:%p, free from vcqueue", pRead);
+  taosFreeQitem(pRead);
+}
+
+static void vnodeSendVCancelRpcRsp(SVReadMsg *pRead, int32_t code) {
+  SRpcMsg rpcRsp = {
+    .handle  = pRead->rpcHandle,
+    .pCont   = pRead->rspRet.rsp,
+    .contLen = pRead->rspRet.len,
+    .code    = code,
+  };
+
+  rpcSendResponse(&rpcRsp);
+  vnodeFreeFromCQueue(pRead);
+}
+
+static void *vnodeCWorkerFunc(void *param) {
+  int32_t    qtype;
+  SVReadMsg *pRead;
+  SVnodeObj *pVnode;
+
+  while (1) {
+    if (taosReadQitemFromQset(tsVCWorkerQset, &qtype, (void **)&pRead, (void **)&pVnode) == 0) {
+      vDebug("qset:%p, vcworker got no message from qset, exiting", tsVCWorkerQset);
+      break;
+    }
+
+    vTrace("msg:%p will be processed in vcworker queue", pRead);
+    
+    assert(qtype == TAOS_QTYPE_RPC);
+    assert(pVnode == NULL);
+    
+    int32_t code = vnodeProcessRead(NULL, pRead);
+    vnodeSendVCancelRpcRsp(pRead, code);
+  }
+
+  return NULL;
+}

src/vnode/src/vnodeMain.c

@@ -27,6 +27,7 @@
 #include "dnode.h"
 #include "vnodeCfg.h"
 #include "vnodeVersion.h"
+#include "vnodeCancel.h"
 
 static SHashObj*tsVnodesHash;
 static void     vnodeCleanUp(SVnodeObj *pVnode);
@@ -63,6 +64,7 @@ int32_t vnodeInitResources() {
 
   vnodeInitWriteFp();
   vnodeInitReadFp();
+  vnodeInitCWorker();
 
   tsVnodesHash = taosHashInit(TSDB_MIN_VNODES, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
   if (tsVnodesHash == NULL) {
@@ -79,6 +81,7 @@ int32_t vnodeInitResources() {
 }
 
 void vnodeCleanupResources() {
+  vnodeCleanupCWorker();
   tsdbDestroyCommitQueue();
 
   if (tsVnodesHash != NULL) {

src/vnode/src/vnodeRead.c

@@ -25,6 +25,7 @@
 #include "vnode.h"
 #include "vnodeInt.h"
 #include "tqueue.h"
+#include "vnodeCancel.h"
 
 static int32_t (*vnodeProcessReadMsgFp[TSDB_MSG_TYPE_MAX])(SVnodeObj *pVnode, SVReadMsg *pRead);
 static int32_t  vnodeProcessQueryMsg(SVnodeObj *pVnode, SVReadMsg *pRead);
@@ -115,13 +116,15 @@ int32_t vnodeWriteToRQueue(void *vparam, void *pCont, int32_t contLen, int8_t qt
   }
 
   pRead->qtype = qtype;
-
-  atomic_add_fetch_32(&pVnode->refCount, 1);
-  atomic_add_fetch_32(&pVnode->queuedRMsg, 1);
-  vTrace("vgId:%d, write into vrqueue, refCount:%d queued:%d", pVnode->vgId, pVnode->refCount, pVnode->queuedRMsg);
-
-  taosWriteQitem(pVnode->rqueue, qtype, pRead);
-  return TSDB_CODE_SUCCESS;
+  
+  if (pRead->msgType == TSDB_MSG_TYPE_CM_KILL_QUERY) {
+    return vnodeWriteIntoCQueue(pRead);
+  } else {
+    atomic_add_fetch_32(&pVnode->refCount, 1);
+    atomic_add_fetch_32(&pVnode->queuedRMsg, 1);
+    vTrace("vgId:%d, write into vrqueue, refCount:%d queued:%d", pVnode->vgId, pVnode->refCount, pVnode->queuedRMsg);
+    return taosWriteQitem(pVnode->rqueue, qtype, pRead);
+  }
 }
 
 static int32_t vnodePutItemIntoReadQueue(SVnodeObj *pVnode, void **qhandle, void *ahandle) {