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Posted to mapreduce-dev@hadoop.apache.org by "Luke Lu (JIRA)" <ji...@apache.org> on 2011/09/21 18:48:09 UTC

[jira] [Created] (MAPREDUCE-3060) Generic shuffle service

Generic shuffle service
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                 Key: MAPREDUCE-3060
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3060
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2
    Affects Versions: 0.23.0
            Reporter: Luke Lu
             Fix For: 0.24.0


When I was talking to Owen about HADOOP-2600, we came across (again, talked about it with Chris before) the shuffle dependency issue. NodeManager currently has an implicit (hidden by the service plugin mechanism) dependency of a specific version of mapreduce shuffle. While this works in many cases, as long as we don't change shuffle headers and the usage of mapred security tokens, it's a hack to make things work none the less. It's generally agreed upon that nodemanager should only load generic services that are mapreduce framework neutral.

In this particular case, the right solution seems to be a generic shuffle handler that can serve data for a particular partition securely. The ShuffleHandler currently only depends on mapreduce for task tokens and shuffle header, which is only used for writing data, i.e., the shuffle handler has no semantic dependency on mapreduce.

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