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https://issues.apache.org/jira/browse/HADOOP-3326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sharad Agarwal updated HADOOP-3326:
-----------------------------------
Release Note: LocalFSMerger and InMemFSMergeThread threads are spawned only
once in fetchOutputs() method. The thread gets notified when something is ready
for merge. The merge happens when thresholds are met.
Status: Patch Available (was: Open)
> ReduceTask should not sleep for 200 ms while waiting for merge to finish
> ------------------------------------------------------------------------
>
> Key: HADOOP-3326
> URL: https://issues.apache.org/jira/browse/HADOOP-3326
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Owen O'Malley
> Assignee: Sharad Agarwal
> Fix For: 0.18.0
>
> Attachments: 3326_1.patch, 3326_2.patch, 3326_3.patch
>
>
> Currently the merge code in Reduce task does:
> {code}
> // Wait for the on-disk merge to complete
> while (localFSMergeInProgress) {
> Thread.sleep(200);
> }
>
> //wait for an ongoing merge (if it is in flight) to complete
> while (mergeInProgress) {
> Thread.sleep(200);
> }
> {code}
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