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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1077) Race condition in fetching map outputs (might lead to hung reduces)
Date Wed, 07 Mar 2007 09:22:24 GMT
Race condition in fetching map outputs (might lead to hung reduces)
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                 Key: HADOOP-1077
                 URL: https://issues.apache.org/jira/browse/HADOOP-1077
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
            Reporter: Devaraj Das
         Assigned To: Devaraj Das


Sometimes when a map task is lost while the map-output fetch is happening from the TT for
that task, and the lost map has successfully executed on some other node, the event for that
successful execution is lost at the fetching TT. The fetching TT might eventually fail to
fetch the output for the lost task, but then since the event for the new run of the lost map
might also have been lost, the fetching TT might hang.

This "hung" problem was discovered while working on HADOOP-1060.

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