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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-1763) JobHistory should enable history collection after a timeout or some other event
Date Fri, 07 May 2010 03:59:48 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu resolved MAPREDUCE-1763.
------------------------------------------------

    Resolution: Duplicate

Will not be an issue after MAPREDUCE-1699 

> JobHistory should enable history collection after a timeout or some other event
> -------------------------------------------------------------------------------
>
>                 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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