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Posted to mapreduce-dev@hadoop.apache.org by "Devaraj K (JIRA)" <ji...@apache.org> on 2011/05/18 17:49:47 UTC
[jira] [Created] (MAPREDUCE-2512) 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
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
Assignee: Devaraj K
{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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[jira] [Resolved] (MAPREDUCE-2512) 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
Posted by "Devaraj K (Resolved) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-2512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Devaraj K resolved MAPREDUCE-2512.
----------------------------------
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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