[ https://issues.apache.org/jira/browse/MAPREDUCE-2512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Todd Lipcon updated MAPREDUCE-2512: ----------------------------------- Status: Open (was: Patch Available) > 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 > Fix For: 0.20.4 > > 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. > -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira