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Posted to mapreduce-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2013/02/25 21:48:12 UTC

[jira] [Created] (MAPREDUCE-5027) Shuffle does not limit number of outstanding connections

Jason Lowe created MAPREDUCE-5027:
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             Summary: Shuffle does not limit number of outstanding connections
                 Key: MAPREDUCE-5027
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5027
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.23.5, 2.0.3-alpha
            Reporter: Jason Lowe


The ShuffleHandler does not have any configurable limits to the number of outstanding connections allowed.  Therefore a node with many map outputs and many reducers in the cluster trying to fetch those outputs can exhaust a nodemanager out of file descriptors.

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