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https://issues.apache.org/jira/browse/FLINK-8178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16287901#comment-16287901
 ] 

ASF GitHub Bot commented on FLINK-8178:
---------------------------------------

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

    https://github.com/apache/flink/pull/5105#discussion_r156414085
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/api/writer/RecordWriter.java
 ---
    @@ -129,8 +130,8 @@ private void sendToTarget(T record, int targetChannel) 
throws IOException, Inter
                                                break;
                                        }
                                } else {
    -                                   buffer = 
targetPartition.getBufferProvider().requestBufferBlocking();
    -                                   result = 
serializer.setNextBuffer(buffer);
    +                                   BufferBuilder bufferBuilder = 
targetPartition.getBufferProvider().requestBufferBuilderBlocking();
    --- End diff --
    
    can you break this long line up?


> Introduce not threadsafe write only BufferBuilder
> -------------------------------------------------
>
>                 Key: FLINK-8178
>                 URL: https://issues.apache.org/jira/browse/FLINK-8178
>             Project: Flink
>          Issue Type: Improvement
>          Components: Network
>            Reporter: Piotr Nowojski
>            Assignee: Piotr Nowojski
>             Fix For: 1.5.0
>
>
> While Buffer class is used in multithreaded context it requires 
> synchronisation. Now it is miss-leading/unclear and suggesting that 
> RecordSerializer should take into account synchronisation of the Buffer 
> that's holding. With NotThreadSafe BufferBuilder there would be clear 
> separation between single-threaded writing/creating a BufferBuilder and 
> multithreaded Buffer handling/retaining/recycling.



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