clintropolis commented on a change in pull request #12032:
URL: https://github.com/apache/druid/pull/12032#discussion_r769206105



##########
File path: 
core/src/main/java/org/apache/druid/java/util/http/client/HttpClientInit.java
##########
@@ -53,39 +48,13 @@ public static HttpClient createClient(HttpClientConfig 
config, Lifecycle lifecyc
     try {
       // We need to use the full constructor in order to set a 
ThreadNameDeterminer. The other parameters are taken
       // from the defaults in HashedWheelTimer's other constructors.

Review comment:
       these comments seem no longer relevant

##########
File path: 
core/src/main/java/org/apache/druid/java/util/http/client/NettyHttpClient.java
##########
@@ -355,30 +355,31 @@ public void channelDisconnected(ChannelHandlerContext 
context, ChannelStateEvent
           private void removeHandlers()
           {
             if (readTimeout > 0) {
-              channel.getPipeline().remove(READ_TIMEOUT_HANDLER_NAME);
+              channel.pipeline().remove(READ_TIMEOUT_HANDLER_NAME);
             }
-            channel.getPipeline().remove(LAST_HANDLER_NAME);
+            channel.pipeline().remove(LAST_HANDLER_NAME);
           }
         }
     );
 
-    channel.write(httpRequest).addListener(
-        new ChannelFutureListener()
-        {
-          @Override
-          public void operationComplete(ChannelFuture future)
-          {
-            if (!future.isSuccess()) {
-              channel.close();
-              channelResourceContainer.returnResource();
-              if (!retVal.isDone()) {
-                retVal.setException(
-                    new ChannelException(
-                        StringUtils.format("[%s] Failed to write request to 
channel", requestDesc),
-                        future.getCause()
-                    )
-                );
-              }
+    channel.write(httpRequest);
+    if (request.hasContent()) {
+      channel.write(new DefaultHttpContent(request.getContent()));
+    }
+    channel.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT).addListener(

Review comment:
       the 'flush' change was the one that stuck out to me in 
https://netty.io/wiki/new-and-noteworthy-in-4.0.html, looks like we got them 
all afaict :+1:




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