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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8178) Introduce not threadsafe write only BufferBuilder
Date Fri, 15 Dec 2017 13:16:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292514#comment-16292514
] 

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

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

    https://github.com/apache/flink/pull/5105#discussion_r156934340
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/api/serialization/SpanningRecordSerializer.java
---
    @@ -169,33 +151,29 @@ public Buffer getCurrentBuffer() {
     		if (targetBuffer == null) {
     			return null;
     		}
    -
    -		targetBuffer.setSize(position);
    -		return targetBuffer;
    +		Buffer result = targetBuffer.build();
    +		targetBuffer = null;
    +		return result;
    --- End diff --
    
    It kind of depends in which direction we will go with further changes.


> 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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