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https://issues.apache.org/jira/browse/MAPREDUCE-2512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devaraj K resolved MAPREDUCE-2512.
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Resolution: Won't Fix
Assignee: (was: Devaraj K)
It doesn't exist in the trunk hence closing it.
> wait(5000) and notify() mechanism can be implemented instead of sleep(5000)
> in reduce task when there are no copies in progress and no new copies to
> schedule
> -------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2512
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2512
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: task
> Affects Versions: 0.20.2
> Reporter: Devaraj K
> Attachments: MAPREDUCE-2512.patch
>
>
> {code:title=ReduceTask.java|borderStyle=solid}
> try {
> if (numInFlight == 0 && numScheduled == 0) {
> // we should indicate progress as we don't want TT to think
> // we're stuck and kill us
> reporter.progress();
> Thread.sleep(5000);
> }
> } catch (InterruptedException e) { } // IGNORE
> {code}
> Here if we have no copies in flight and we can't schedule anything new, it is
> going to wait for 5000 millis. Instead of waiting for 5000 millis, this
> thread can wait with timeout and GetMapEventsThread can notify it if gets new
> map completion events earlier than 5000 millis time.
>
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