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Posted to mapreduce-issues@hadoop.apache.org by "Siddharth Seth (Updated) (JIRA)" <ji...@apache.org> on 2012/01/10 20:16:40 UTC

[jira] [Updated] (MAPREDUCE-3512) Batch jobHistory disk flushes

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

Siddharth Seth updated MAPREDUCE-3512:
--------------------------------------

    Attachment: MR3512.txt

Initial patch - will upload another one later with some of the TODOs resolved and with unit tests.
                
> 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
>            Assignee: Siddharth Seth
>            Priority: Blocker
>         Attachments: MR3512.txt
>
>
> 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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