enh(stream): add API to retrieve last ts for multi-tables.

source/dnode/vnode/inc/vnode.h

@@ -198,6 +198,7 @@ void        *tsdbGetIdx(SMeta *pMeta);
 void        *tsdbGetIvtIdx(SMeta *pMeta);
 uint64_t     tsdbGetReaderMaxVersion(STsdbReader *pReader);
 void         tsdbReaderSetCloseFlag(STsdbReader *pReader);
+int64_t      tsdbGetLastTimestamp(SVnode* pVnode, void* pTableList, int32_t numOfTables, const char* pIdStr);
 
 int32_t tsdbReuseCacherowsReader(void* pReader, void* pTableIdList, int32_t numOfTables);
 int32_t tsdbCacherowsReaderOpen(void *pVnode, int32_t type, void *pTableIdList, int32_t numOfTables, int32_t numOfCols,

source/dnode/vnode/src/tq/tq.c

@@ -760,6 +760,7 @@ void freePtr(void *ptr) {
 
 int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver) {
   int32_t vgId = TD_VID(pTq->pVnode);
+
   pTask->id.idStr = createStreamTaskIdStr(pTask->id.streamId, pTask->id.taskId);
   pTask->refCnt = 1;
   pTask->status.schedStatus = TASK_SCHED_STATUS__INACTIVE;
@@ -837,7 +838,7 @@ int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver) {
   }
 
   if (pTask->taskLevel == TASK_LEVEL__SOURCE) {
-    SWalFilterCond cond = {.deleteMsg = 1};
+    SWalFilterCond cond = {.deleteMsg = 1};  // delete msg also extract from wal files
     pTask->exec.pWalReader = walOpenReader(pTq->pVnode->pWal, &cond);
   }
 

source/dnode/vnode/src/tsdb/tsdbRead.c

@@ -5506,3 +5506,58 @@ void tsdbReaderSetId(STsdbReader* pReader, const char* idstr) {
 }
 
 void tsdbReaderSetCloseFlag(STsdbReader* pReader) { pReader->code = TSDB_CODE_TSC_QUERY_CANCELLED; }
+
+/*-------------todo:refactor the implementation of those APIs in this file to seperate the API into two files------*/
+// opt perf, do NOT create so many readers
+int64_t tsdbGetLastTimestamp(SVnode* pVnode, void* pTableList, int32_t numOfTables, const char* pIdStr) {
+  SQueryTableDataCond cond = {.type = TIMEWINDOW_RANGE_CONTAINED, .numOfCols = 1, .order = TSDB_ORDER_DESC,
+                              .startVersion = -1, .endVersion = -1};
+  cond.twindows.skey = INT64_MIN;
+  cond.twindows.ekey = INT64_MAX;
+
+  cond.colList = taosMemoryCalloc(1, sizeof(SColumnInfo));
+  cond.pSlotList = taosMemoryMalloc(sizeof(int32_t) * cond.numOfCols);
+  if (cond.colList == NULL || cond.pSlotList == NULL) {
+    // todo
+  }
+
+  cond.colList[0].colId = 1;
+  cond.colList[0].slotId = 0;
+  cond.colList[0].type = TSDB_DATA_TYPE_TIMESTAMP;
+
+  cond.pSlotList[0] = 0;
+
+  STableKeyInfo* pTableKeyInfo = pTableList;
+  STsdbReader* pReader = NULL;
+  SSDataBlock* pBlock = createDataBlock();
+
+  SColumnInfoData data = {0};
+  data.info = (SColumnInfo) {.type = TSDB_DATA_TYPE_TIMESTAMP, .colId = 1, .bytes = TSDB_KEYSIZE};
+  blockDataAppendColInfo(pBlock, &data);
+
+  int64_t key = INT64_MIN;
+
+  for(int32_t i = 0; i < numOfTables; ++i) {
+    int32_t code = tsdbReaderOpen(pVnode, &cond, &pTableKeyInfo[i], 1, pBlock, &pReader, pIdStr, false, NULL);
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
+
+    bool hasData = false;
+    code = tsdbNextDataBlock(pReader, &hasData);
+    if (!hasData || code != TSDB_CODE_SUCCESS) {
+      continue;
+    }
+
+    SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, 0);
+    int64_t k = *(int64_t*)pCol->pData;
+
+    if (key < k) {
+      key = k;
+    }
+
+    tsdbReaderClose(pReader);
+  }
+
+  return 0;
+}

source/libs/stream/src/streamRecover.c

@@ -20,7 +20,7 @@ int32_t streamTaskLaunchRecover(SStreamTask* pTask, int64_t version) {
 
   if (pTask->taskLevel == TASK_LEVEL__SOURCE) {
     atomic_store_8(&pTask->status.taskStatus, TASK_STATUS__RECOVER_PREPARE);
-    qDebug("s-task:%s set task status:%d and start recover", pTask->id.idStr, pTask->status.taskStatus);
+    qDebug("s-task:%s set task status:%d and start to recover", pTask->id.idStr, pTask->status.taskStatus);
 
     streamSetParamForRecover(pTask);
     streamSourceRecoverPrepareStep1(pTask, version);
@@ -46,6 +46,7 @@ int32_t streamTaskLaunchRecover(SStreamTask* pTask, int64_t version) {
     streamSetParamForRecover(pTask);
     streamAggRecoverPrepare(pTask);
   } else if (pTask->taskLevel == TASK_LEVEL__SINK) {
+    // sink nodes has no specified operation for fill history
     atomic_store_8(&pTask->status.taskStatus, TASK_STATUS__NORMAL);
   }
 
@@ -71,23 +72,23 @@ int32_t streamTaskCheckDownstream(SStreamTask* pTask, int64_t version) {
     req.downstreamTaskId = pTask->fixedEpDispatcher.taskId;
     pTask->checkReqId = req.reqId;
 
-    qDebug("s-task:%s at node %d check downstream task %d at node %d", pTask->id.idStr, pTask->nodeId, req.downstreamTaskId,
+    qDebug("s-task:%s at node %d check downstream task:%d at node %d", pTask->id.idStr, pTask->nodeId, req.downstreamTaskId,
            req.downstreamNodeId);
     streamDispatchCheckMsg(pTask, &req, pTask->fixedEpDispatcher.nodeId, &pTask->fixedEpDispatcher.epSet);
   } else if (pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
     SArray* vgInfo = pTask->shuffleDispatcher.dbInfo.pVgroupInfos;
 
-    int32_t vgSz = taosArrayGetSize(vgInfo);
-    pTask->recoverTryingDownstream = vgSz;
-    pTask->checkReqIds = taosArrayInit(vgSz, sizeof(int64_t));
+    int32_t numOfVgs = taosArrayGetSize(vgInfo);
+    pTask->recoverTryingDownstream = numOfVgs;
+    pTask->checkReqIds = taosArrayInit(numOfVgs, sizeof(int64_t));
 
-    for (int32_t i = 0; i < vgSz; i++) {
+    for (int32_t i = 0; i < numOfVgs; i++) {
       SVgroupInfo* pVgInfo = taosArrayGet(vgInfo, i);
       req.reqId = tGenIdPI64();
       taosArrayPush(pTask->checkReqIds, &req.reqId);
       req.downstreamNodeId = pVgInfo->vgId;
       req.downstreamTaskId = pVgInfo->taskId;
-      qDebug("s-task:%s at node %d check downstream task %d at node %d (shuffle)", pTask->id.idStr, pTask->nodeId,
+      qDebug("s-task:%s at node %d check downstream task:%d at node %d (shuffle)", pTask->id.idStr, pTask->nodeId,
              req.downstreamTaskId, req.downstreamNodeId);
       streamDispatchCheckMsg(pTask, &req, pVgInfo->vgId, &pVgInfo->epSet);
     }
@@ -161,7 +162,7 @@ int32_t streamProcessTaskCheckRsp(SStreamTask* pTask, const SStreamTaskCheckRsp*
         taosArrayDestroy(pTask->checkReqIds);
         pTask->checkReqIds = NULL;
 
-        qDebug("s-task:%s all downstream tasks:%d are ready, now enter into recover stage", pTask->id.idStr, numOfReqs);
+        qDebug("s-task:%s all %d downstream tasks are ready, now enter into recover stage", pTask->id.idStr, numOfReqs);
         streamTaskLaunchRecover(pTask, version);
       }
     } else if (pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH) {