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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-6303) Read timeout when retrying a fetch error can be fatal to a reducer
Date Wed, 01 Apr 2015 21:32:54 GMT
Jason Lowe created MAPREDUCE-6303:
-------------------------------------

             Summary: Read timeout when retrying a fetch error can be fatal to a reducer
                 Key: MAPREDUCE-6303
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6303
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 2.6.0
            Reporter: Jason Lowe
            Priority: Blocker


If a reducer encounters an error trying to fetch from a node then encounters a read timeout
when trying to re-establish the connection then the reducer can fail.  The read timeout exception
can leak to the top of the Fetcher thread which will cause the reduce task to teardown.  This
type of error can repeat across reducer attempts causing jobs to fail due to a single bad
node.



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