[td-225] support query cancel.

src/query/src/qExecutor.c

@@ -12,8 +12,8 @@
  * 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 "qfill.h"
 #include "os.h"
+#include "qfill.h"
 
 #include "hash.h"
 #include "hashfunc.h"
@@ -5822,20 +5822,39 @@ _over:
   //pQInfo already freed in initQInfo, but *pQInfo may not pointer to null;
   if (code != TSDB_CODE_SUCCESS) {
     *pQInfo = NULL;
+  } else {
+    SQInfo* pq = (SQInfo*) (*pQInfo);
+
+    T_REF_INC(pq);
+    T_REF_INC(pq);
   }
 
   // if failed to add ref for all meters in this query, abort current query
   return code;
 }
 
-void qDestroyQueryInfo(qinfo_t pQInfo) {
+static void doDestoryQueryInfo(SQInfo* pQInfo) {
+  assert(pQInfo != NULL);
   qTrace("QInfo:%p query completed", pQInfo);
-  
-  // print the query cost summary
-  queryCostStatis(pQInfo);
+  queryCostStatis(pQInfo);   // print the query cost summary
   freeQInfo(pQInfo);
 }
 
+void qDestroyQueryInfo(qinfo_t qHandle) {
+  SQInfo* pQInfo = (SQInfo*) qHandle;
+  if (!isValidQInfo(pQInfo)) {
+    return;
+  }
+
+  // set the query is cancelled
+  setQueryKilled(pQInfo);
+
+  int16_t ref = T_REF_DEC(pQInfo);
+  if (ref == 0) {
+    doDestoryQueryInfo(pQInfo);
+  }
+}
+
 void qTableQuery(qinfo_t qinfo) {
   SQInfo *pQInfo = (SQInfo *)qinfo;
 
@@ -5846,6 +5865,11 @@ void qTableQuery(qinfo_t qinfo) {
 
   if (isQueryKilled(pQInfo)) {
     qTrace("QInfo:%p it is already killed, abort", pQInfo);
+
+    int16_t ref = T_REF_DEC(pQInfo);
+    if (ref == 0) {
+      doDestoryQueryInfo(pQInfo);
+    }
     return;
   }
 
@@ -5861,7 +5885,10 @@ void qTableQuery(qinfo_t qinfo) {
   }
 
   sem_post(&pQInfo->dataReady);
-  //  vnodeDecRefCount(pQInfo);
+  int16_t ref = T_REF_DEC(pQInfo);
+  if (ref == 0) {
+    doDestoryQueryInfo(pQInfo);
+  }
 }
 
 int32_t qRetrieveQueryResultInfo(qinfo_t qinfo) {
@@ -5887,20 +5914,27 @@ int32_t qRetrieveQueryResultInfo(qinfo_t qinfo) {
 bool qHasMoreResultsToRetrieve(qinfo_t qinfo) {
   SQInfo *pQInfo = (SQInfo *)qinfo;
 
-  if (pQInfo == NULL || pQInfo->signature != pQInfo || pQInfo->code != TSDB_CODE_SUCCESS) {
+  if (isValidQInfo(pQInfo) || pQInfo->code != TSDB_CODE_SUCCESS) {
     return false;
   }
 
   SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
+  bool ret = false;
   if (Q_STATUS_EQUAL(pQuery->status, QUERY_OVER)) {
-    return false;
+    ret = false;
   } else if (Q_STATUS_EQUAL(pQuery->status, QUERY_RESBUF_FULL)) {
-    return true;
+    ret = true;
   } else if (Q_STATUS_EQUAL(pQuery->status, QUERY_COMPLETED)) {
-    return true;
+    ret = true;
   } else {
     assert(0);
   }
+
+  if (ret) {
+    T_REF_INC(pQInfo);
+  }
+
+  return ret;
 }
 
 int32_t qDumpRetrieveResult(qinfo_t qinfo, SRetrieveTableRsp **pRsp, int32_t *contLen) {

src/vnode/src/vnodeRead.c

@@ -59,6 +59,18 @@ int32_t vnodeProcessRead(void *param, SReadMsg *pReadMsg) {
   return (*vnodeProcessReadMsgFp[msgType])(pVnode, pReadMsg);
 }
 
+// notify connection(handle) that current qhandle is created, if current connection from
+// client is broken, the query needs to be killed immediately.
+static void vnodeNotifyCurrentQhandle(void* handle, void* qhandle, int32_t vgId) {
+  SRetrieveTableMsg* killQueryMsg = rpcMallocCont(sizeof(SRetrieveTableMsg));
+  killQueryMsg->qhandle = htobe64((uint64_t) qhandle);
+  killQueryMsg->free = htons(1);
+  killQueryMsg->header.vgId = htonl(vgId);
+  killQueryMsg->header.contLen = htonl(sizeof(SRetrieveTableMsg));
+
+  rpcReportProgress(handle, (char*) killQueryMsg, sizeof(SRetrieveTableMsg));
+}
+
 static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
   void *   pCont = pReadMsg->pCont;
   int32_t  contLen = pReadMsg->contLen;
@@ -67,9 +79,23 @@ static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
   SQueryTableMsg* pQueryTableMsg = (SQueryTableMsg*) pCont;
   memset(pRet, 0, sizeof(SRspRet));
 
-  int32_t code = TSDB_CODE_SUCCESS;
+  // qHandle needs to be freed correctly
+  if (pReadMsg->rpcMsg.code != TSDB_CODE_SUCCESS) {
+    assert(pReadMsg->rpcMsg.contLen > 0);
+
+    SRetrieveTableMsg* killQueryMsg = (SRetrieveTableMsg*) pReadMsg->pCont;
+    killQueryMsg->free = htons(killQueryMsg->free);
+    killQueryMsg->qhandle = htobe64(killQueryMsg->qhandle);
+
+    assert(killQueryMsg->free == 1);
+    qDestroyQueryInfo((qinfo_t) killQueryMsg->qhandle);
 
+    return TSDB_CODE_SUCCESS;
+  }
+
+  int32_t code = TSDB_CODE_SUCCESS;
   qinfo_t pQInfo = NULL;
+
   if (contLen != 0) {
     code = qCreateQueryInfo(pVnode->tsdb, pVnode->vgId, pQueryTableMsg, &pQInfo);
 
@@ -80,6 +106,8 @@ static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
     pRet->len = sizeof(SQueryTableRsp);
     pRet->rsp = pRsp;
 
+    vnodeNotifyCurrentQhandle(pReadMsg->rpcMsg.handle, pQInfo, pVnode->vgId);
+
     vTrace("vgId:%d, QInfo:%p, dnode query msg disposed", pVnode->vgId, pQInfo);
   } else {
     assert(pCont != NULL);