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https://issues.apache.org/jira/browse/MAPREDUCE-6763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15428749#comment-15428749
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Nathan Roberts commented on MAPREDUCE-6763:
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Thanks [~jlowe] for the improvement. This will certainly help busy shuffle
handlers although larger clusters will probably want to tune this up well above
the default of 128. Patch looks good, +1 (non-binding).
> Shuffle server listen queue is too small
> ----------------------------------------
>
> Key: MAPREDUCE-6763
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6763
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Attachments: MAPREDUCE-6763.001.patch
>
>
> ShuffleHandler doesn't specify a listen queue length for the server port, so
> it ends up getting the default listen queue length of 50. This is too small
> to handle bursts of shuffle traffic on large clusters. It's also
> inconsistent with the default Hadoop uses for RPC servers (default=128).
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