[ https://issues.apache.org/jira/browse/HADOOP-3326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Devaraj Das updated HADOOP-3326:
--------------------------------

    Hadoop Flags: [Reviewed]

> 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, hadoop-3326_4.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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