feat: improve the multithread insert performance of dispatcher

src/client/src/tscBulkWrite.c

@@ -144,32 +144,40 @@ int32_t dispatcherStatementMerge(SArray* statements, SSqlObj** result) {
 }
 
 /**
- * Poll all the SSqlObj* in the dispatcher's buffer.
+ * Poll all the SSqlObj* in the dispatcher's buffer (No Lock). After call this function,
+ * you need to notify dispatcher->notFull by yourself.
  *
  * @param dispatcher    the dispatcher.
  * @return              the items in the dispatcher, SArray<SSqlObj*>.
  */
 inline static SArray* dispatcherPollAll(SAsyncBulkWriteDispatcher* dispatcher) {
-  pthread_mutex_lock(&dispatcher->mutex);
   if (!atomic_load_32(&dispatcher->bufferSize)) {
-    pthread_cond_broadcast(&dispatcher->notFull);
-    pthread_mutex_unlock(&dispatcher->mutex);
     return NULL;
   }
   
   SArray* statements = taosArrayDup(dispatcher->buffer);
   if (statements == NULL) {
-    pthread_mutex_unlock(&dispatcher->mutex);
     tscError("failed to poll all items: out of memory");
     return NULL;
   }
-
+  
   atomic_store_32(&dispatcher->bufferSize, 0);
   atomic_store_32(&dispatcher->currentSize, 0);
   taosArrayClear(dispatcher->buffer);
+  return statements;
+}
+
+/**
+ * Poll all the SSqlObj* in the dispatcher's buffer.
+ *
+ * @param dispatcher    the dispatcher.
+ * @return              the items in the dispatcher, SArray<SSqlObj*>.
+ */
+inline static SArray* dispatcherLockPollAll(SAsyncBulkWriteDispatcher* dispatcher) {
+  pthread_mutex_lock(&dispatcher->mutex);
+  SArray* statements = dispatcherPollAll(dispatcher);
   pthread_cond_broadcast(&dispatcher->notFull);
   pthread_mutex_unlock(&dispatcher->mutex);
-
   return statements;
 }
 
@@ -178,9 +186,9 @@ inline static SArray* dispatcherPollAll(SAsyncBulkWriteDispatcher* dispatcher) {
  *
  * @param dispatcher  the async bulk write dispatcher.
  * @param pSql        the sql object to offer.
- * @return            if offer success, return the current size of the buffer. otherwise returns -1.
+ * @return            return whether offer success.
  */
-inline static int32_t dispatcherTryOffer(SAsyncBulkWriteDispatcher* dispatcher, SSqlObj* pSql) {
+inline static bool dispatcherTryOffer(SAsyncBulkWriteDispatcher* dispatcher, SSqlObj* pSql) {
   pthread_mutex_lock(&dispatcher->mutex);
   
   // if dispatcher is shutdown, must fail back to normal insertion.
@@ -204,6 +212,14 @@ inline static int32_t dispatcherTryOffer(SAsyncBulkWriteDispatcher* dispatcher,
   atomic_fetch_add_32(&dispatcher->bufferSize, 1);
   int32_t numOfRows = statementGetInsertionRows(pSql);
   int32_t currentSize = atomic_add_fetch_32(&dispatcher->currentSize, numOfRows);
+  
+  // the dispatcher has been shutdown or reach batch size.
+  if (atomic_load_8(&dispatcher->shutdown) || currentSize >= dispatcher->batchSize) {
+    SArray* statements = dispatcherPollAll(dispatcher);
+    dispatcherExecute(statements);
+    taosArrayDestroy(&statements);
+    pthread_cond_broadcast(&dispatcher->notFull);
+  }
   pthread_mutex_unlock(&dispatcher->mutex);
   return currentSize;
 }
@@ -305,7 +321,7 @@ static void* dispatcherTimeoutCallback(void* arg) {
     struct timespec timeout = afterMillis(current, dispatcher->timeoutMs);
 
     atomic_store_8(&dispatcher->exclusive, true);
-    SArray* statements = dispatcherPollAll(dispatcher);
+    SArray* statements = dispatcherLockPollAll(dispatcher);
     atomic_store_8(&dispatcher->exclusive, false);
     dispatcherExecute(statements);
     taosArrayDestroy(&statements);
@@ -381,7 +397,7 @@ void destroyAsyncDispatcher(SAsyncBulkWriteDispatcher* dispatcher) {
 
   // poll and send all the statements in the buffer.
   while (atomic_load_32(&dispatcher->bufferSize)) {
-    SArray* statements = dispatcherPollAll(dispatcher);
+    SArray* statements = dispatcherLockPollAll(dispatcher);
     dispatcherExecute(statements);
     taosArrayDestroy(&statements);
   }
@@ -446,17 +462,7 @@ bool dispatcherTryBatching(SAsyncBulkWriteDispatcher* dispatcher, SSqlObj* pSql)
   }
 
   // try to offer pSql to the buffer.
-  int32_t currentSize = dispatcherTryOffer(dispatcher, pSql);
-  if (currentSize < 0) {
-    return false;
-  }
-  
-  if (atomic_load_8(&dispatcher->shutdown) || currentSize >= dispatcher->batchSize) {
-    SArray* statements = dispatcherPollAll(dispatcher);
-    dispatcherExecute(statements);
-    taosArrayDestroy(&statements);
-  }
-  return true;
+  return dispatcherTryOffer(dispatcher, pSql);
 }
 
 /**