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From "Vinod Kumar Vavilapalli (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3901) lazy load JobHistory Task and TaskAttempt details
Date Tue, 28 Feb 2012 00:27:53 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217727#comment-13217727
] 

Vinod Kumar Vavilapalli commented on MAPREDUCE-3901:
----------------------------------------------------

Reviewed the patch. Looks good. +1.

After this, I think we can have separate caches for list of CompletedJob with tasks loaded
and list of CompletedJob with no tasks loaded. Will open a separate ticket.

Pushing this in.
                
> lazy load JobHistory Task and TaskAttempt details
> -------------------------------------------------
>
>                 Key: MAPREDUCE-3901
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3901
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobhistoryserver, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>         Attachments: MR3901.txt, MR3901_v2.txt, MR3901_v3.txt
>
>
> The job history UI and MRClientProtocol calls routed via JobHistory are very slow for
large jobs. Some of this time is spent parsing the history file. A good chunk is spent pre-creating
lots of objects which may never be used. Those can be create when required - bringing down
the load times of job history pages and getJobReport etc calls to approximately the history
file parse time.

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