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https://issues.apache.org/jira/browse/MAPREDUCE-1920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886668#action_12886668
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Tom White commented on MAPREDUCE-1920:
--------------------------------------

Actually, I would do it the other way round. Users expect to be able to get 
counters from jobs they have just run, as witnessed by Aaron's experience that 
led to this bug (also 
http://lucene.472066.n3.nabble.com/Hadoop-0-21-job-getCounters-returns-null-td947190.html).
 I would rather have the default configuration work as expected, and advanced 
users can turn off the job store if they don't want to use it. Does that sound 
reasonable?

> Job.getCounters() returns null when using a cluster
> ---------------------------------------------------
>
>                 Key: MAPREDUCE-1920
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1920
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.21.0
>            Reporter: Aaron Kimball
>            Assignee: Tom White
>            Priority: Critical
>         Attachments: MAPREDUCE-1920.patch
>
>
> Calling Job.getCounters() after the job has completed (successfully) returns 
> null.

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