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From "Alex Kozlov (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1763) JobHistory should enable history collection after a timeout or some other event
Date Thu, 06 May 2010 23:23:48 GMT
JobHistory should enable history collection after a timeout or some other event
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                 Key: MAPREDUCE-1763
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1763
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: jobtracker
    Affects Versions: 0.20.1
            Reporter: Alex Kozlov
            Priority: Critical


If you search for disableHistory in JobHistory.java, one can discover that it is enabled only
at the initialization time.  There are two instances where job history can be disabled:

* if it fails to initialize the the output directories
* If it fails to create a single job history file

There are a few problems with that.  One is that there is no way to revert the flag even if
the original problem goes away.  Second, these cases should probably be handled separately.
 The result of which is that once the job history file creation fails, the job history mechanism
becomes disabled and there is no way to switch it back.

One simple solution is to have a timeout after which we can try to enable the job history
collection.  Another is to have a more granular job history control per job.

Alex K


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