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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2237) Lost heartbeat response containing MapTask throws NPE when it is resent
Date Wed, 29 Dec 2010 22:15:45 GMT
Lost heartbeat response containing MapTask throws NPE when it is resent
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                 Key: MAPREDUCE-2237
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2237
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker
    Affects Versions: 0.21.0, 0.20.2, 0.22.0
            Reporter: Todd Lipcon


When the JT sends a heartbeat response, it records it in trackerToHeartbeatResponseMap. But
after MapTask writes its input split, it sets that split to null (assumedly to save memory?).
So, if the heartbeat response is lost, and the JT needs to resend it, it will throw NPE since
the split information has been lost.

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