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https://issues.apache.org/jira/browse/MAPREDUCE-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elton Tian updated MAPREDUCE-2396:
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Summary: InMemFSMergeThread.doInMemMerge() miss the last MapOutput for each
merge round (was: InMemFSMergeThread.doInMemMerge() miss the lass MapOutput
for each merge round )
> InMemFSMergeThread.doInMemMerge() miss the last MapOutput for each merge
> round
> --------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2396
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2396
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.20.2
> Reporter: Elton Tian
> Priority: Critical
>
> In ReduceTask.shuffleInMemory(), once a new MapOutput is read, the
> ramManager.closeInMemoryFile() is called to notify waitForDataToMerge() to
> check if a in memory merge is required. If the threshold is met, the
> doInMemMerge() may start before the MapOutput just read been added to
> mapOutputsFilesInMemory. So the "dataAvailable.notify();" should be removed
> and let the noteCopiedMapOutput() notify the merge.
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