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https://issues.apache.org/jira/browse/MAPREDUCE-4629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450070#comment-13450070
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Robert Joseph Evans commented on MAPREDUCE-4629:
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DEBUG_MODE for the history server is present also in trunk and 2.0 as well.
I don't believe that anyone is using it, but there could be a few people using
it to test the history server outside of Hadoop proper. I am +1 for removing
it. I don't see much of a reason to change anything at this point except to
rip it out, and amybe make the debug-printing LOG.debug. If someone else wants
similar functionality for testing we can add in targeted configs to do things
like what Karthik is suggesting.
> In DEBUG_MODE, JobHistory#directoryTime() returns incorrect time
> ----------------------------------------------------------------
>
> Key: MAPREDUCE-4629
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4629
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 1.0.3
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Attachments: MR-4629.patch, MR-4629.patch.v1
>
>
> The helper methods in JobHistory - directoryTime() and
> timestampDirectoryComponent() - adjust the month field for readability (Jan
> is 0 as per Calendar, 1 for us)
> In DEBUG_MODE, JobHistory uses hour instead of month. However, the adjustment
> is still applied.
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