xingtanzjr commented on code in PR #9768:
URL: https://github.com/apache/iotdb/pull/9768#discussion_r1186034554


##########
server/src/main/java/org/apache/iotdb/db/mpp/plan/scheduler/AsyncPlanNodeSender.java:
##########
@@ -43,38 +46,53 @@
 import static com.google.common.util.concurrent.Futures.immediateFuture;
 
 public class AsyncPlanNodeSender {
+
   private static final Logger logger = 
LoggerFactory.getLogger(AsyncPlanNodeSender.class);
   private final IClientManager<TEndPoint, AsyncDataNodeInternalServiceClient>
       asyncInternalServiceClientManager;
   private final List<FragmentInstance> instances;
-  private final Map<Integer, TSendPlanNodeResp> instanceId2RespMap;
+
+  private final Map<TEndPoint, Pair<List<Integer>, TSendBatchPlanNodeReq>> 
batchRequests;
+  private final Map<Integer, TSendSinglePlanNodeResp> instanceId2RespMap;
   private final AtomicLong pendingNumber;
+  private final long startSendTime;
 
   public AsyncPlanNodeSender(
       IClientManager<TEndPoint, AsyncDataNodeInternalServiceClient>
           asyncInternalServiceClientManager,
       List<FragmentInstance> instances) {
+    this.startSendTime = System.nanoTime();
     this.asyncInternalServiceClientManager = asyncInternalServiceClientManager;
     this.instances = instances;
-    this.instanceId2RespMap = new ConcurrentHashMap<>();
-    this.pendingNumber = new AtomicLong(instances.size());
+    this.batchRequests = new HashMap<>();
+    for (int i = 0; i < instances.size(); i++) {
+      Pair<List<Integer>, TSendBatchPlanNodeReq> value =

Review Comment:
   Replacing `Pair` with an inner class may make this code more concise and 
understandable



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