mqliang commented on a change in pull request #8083:
URL: https://github.com/apache/pinot/pull/8083#discussion_r796146817



##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/transport/ServerChannels.java
##########
@@ -139,22 +143,32 @@ private void attachSSLHandler(SocketChannel ch) {
       }
     }
 
-    synchronized void sendRequest(String rawTableName, AsyncQueryResponse 
asyncQueryResponse,
-        ServerRoutingInstance serverRoutingInstance, InstanceRequest 
instanceRequest)
+    private void sendRequestOrTimeOut(String rawTableName, AsyncQueryResponse 
asyncQueryResponse,

Review comment:
       done

##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/transport/ServerChannels.java
##########
@@ -94,9 +97,10 @@ public void shutDown() {
 
   @ThreadSafe
   private class ServerChannel {
-    final TSerializer _serializer = new TSerializer(new 
TCompactProtocol.Factory());
     final ServerRoutingInstance _serverRoutingInstance;
     final Bootstrap _bootstrap;
+    // lock to protect channel as requests must be written into channel 
sequentially
+    private final ReentrantLock _channelLock = new ReentrantLock();

Review comment:
       done




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