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Date: Wed, 30 Apr 2008 07:43:57 -0700 (PDT)
From: "Amar Kamat (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3326) ReduceTask should not sleep for 200
 ms while waiting for merge to finish
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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 ] 

Amar Kamat commented on HADOOP-3326:
------------------------------------

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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