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https://issues.apache.org/jira/browse/MAPREDUCE-1354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832914#action_12832914
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Arun C Murthy commented on MAPREDUCE-1354:
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Some more things which came up during more investigations: Math.ceil is fairly
expensive, we use it in 2 places. One we can do away by using the cached value
of JobInProgress.slotsPer{Map|Reduce}, the other with using rint (thanks to
Chris for the suggestion).
> Refactor JobTracker.submitJob to not lock the JobTracker during the HDFS
> accesses
> ---------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1354
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1354
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Reporter: Devaraj Das
> Assignee: Arun C Murthy
> Priority: Critical
> Attachments: MAPREDUCE-1354_yhadoop20.patch
>
>
> It'd be nice to have the JobTracker object not be locked while accessing the
> HDFS for reading the jobconf file and while writing the jobinfo file in the
> submitJob method. We should see if we can avoid taking the lock altogether.
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