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https://issues.apache.org/jira/browse/YARN-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhihai xu updated YARN-2376:
----------------------------
Attachment: YARN-2376.000.patch
> Too many threads blocking on the global JobTracker lock from getJobCounters,
> optimize getJobCounters to release global JobTracker lock before access the
> per job counter in JobInProgress
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-2376
> URL: https://issues.apache.org/jira/browse/YARN-2376
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: zhihai xu
> Assignee: zhihai xu
> Attachments: YARN-2376.000.patch
>
>
> Too many threads blocking on the global JobTracker lock from getJobCounters,
> optimize getJobCounters to release global JobTracker lock before access the
> per job counter in JobInProgress. It may be a lot of JobClients to call
> getJobCounters in JobTracker at the same time, Current code will lock the
> JobTracker to block all the threads to get counter from JobInProgress. It is
> better to unlock the JobTracker when get counter from
> JobInProgress(job.getCounters(counters)). So all the theads can run parallel
> when access its own job counter.
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