Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21346#discussion_r195584408
  
    --- Diff: 
common/network-common/src/main/java/org/apache/spark/network/client/TransportClient.java
 ---
    @@ -141,26 +141,14 @@ public void fetchChunk(
         StreamChunkId streamChunkId = new StreamChunkId(streamId, chunkIndex);
         handler.addFetchRequest(streamChunkId, callback);
     
    -    channel.writeAndFlush(new 
ChunkFetchRequest(streamChunkId)).addListener(future -> {
    -      if (future.isSuccess()) {
    -        long timeTaken = System.currentTimeMillis() - startTime;
    -        if (logger.isTraceEnabled()) {
    -          logger.trace("Sending request {} to {} took {} ms", 
streamChunkId,
    -            getRemoteAddress(channel), timeTaken);
    +    channel.writeAndFlush(new ChunkFetchRequest(streamChunkId))
    +      .addListener( new StdChannelListener(startTime, streamChunkId) {
    --- End diff --
    
    nit: no space after `(`


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