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From "Mahadev konar (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3512) Batch jobHistory disk flushes
Date Fri, 23 Dec 2011 00:51:34 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mahadev konar updated MAPREDUCE-3512:
-------------------------------------

    Priority: Critical  (was: Major)
    
> Batch jobHistory disk flushes
> -----------------------------
>
>                 Key: MAPREDUCE-3512
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3512
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Priority: Critical
>
> The mr-am flushes each individual job history event to disk for AM recovery. The history
even handler ends up with a significant backlog for tests like MAPREDUCE-3402. 
> History events could be batched up based on num records / time / TaskFinishedEvents to
reduce the number of DFS writes - with the potential drawback of having to rerun some tasks
during AM recovery.

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