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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-239) job tracker WI drops jobs after 24 hours
Date Wed, 04 Oct 2006 16:39:21 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-239?page=comments#action_12439893 ] 
            
Owen O'Malley commented on HADOOP-239:
--------------------------------------

This is looking good, but the enum class names are all caps when they should be CamelCase.
(So Keys instead of KEYS and Values instead of VALUES.)

> job tracker WI drops jobs after 24 hours
> ----------------------------------------
>
>                 Key: HADOOP-239
>                 URL: http://issues.apache.org/jira/browse/HADOOP-239
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Yoram Arnon
>         Assigned To: Sanjay Dahiya
>            Priority: Minor
>         Attachments: Hadoop-239.patch, Hadoop-239_1.patch, Hadoop-239_2.patch
>
>
> The jobtracker's WI, keeps track of jobs executed in the past 24 hours.
> if the cluster was idle for a day (say Sunday) it drops all its history.
> Monday morning, the page is empty.
> Better would be to store a fixed number of jobs (say 10 each of succeeded and failed
jobs).
> Also, if the job tracker is restarted, it loses all its history.
> The history should be persistent, withstanding restarts and upgrades.

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