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https://issues.apache.org/jira/browse/MAPREDUCE-1354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dick King updated MAPREDUCE-1354:
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Attachment: mapreduce-1354--2010-05-13.patch
I honored the last two comments by Amareshwari [and ignored the one he invited
me to ginore] and this is the patch, but as I write this, {{trunk}} does not
compile, so I'm not resubmitting this patch just yet.
Rather than taking the Big Lock, I chose to turn {{nextJobId}} into an
{{AtomicInteger}} .
I agree that the {{ugi == null}} test is dead.
When {{trunk}} comes to build I'll test this patch and Submit it.
-dk
> Incremental enhancements to the JobTracker for better scalability
> -----------------------------------------------------------------
>
> 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: Dick King
> Priority: Critical
> Attachments: mapreduce-1354--2010-03-10.patch,
> mapreduce-1354--2010-05-13.patch, MAPREDUCE-1354_yhadoop20.patch,
> MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch,
> MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch,
> MAPREDUCE-1354_yhadoop20.patch, MAPREDUCE-1354_yhadoop20.patch,
> mr-1354-y20.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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