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https://issues.apache.org/jira/browse/HADOOP-3326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12593344#action_12593344
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Amar Kamat commented on HADOOP-3326:
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Owen,
This is a one time wait in the lifetime of the reducer. 400ms seems
insignificant as compared to the total runtime of the reducer. What is the
concern here?
> 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
>
> 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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