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Date: Tue, 2 Aug 2011 18:46:27 +0000 (UTC)
From: "Robert Joseph Evans (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-2727) MR-279: SleepJob throws divide
 by zero exception when count = 0
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-2727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13078355#comment-13078355 ] 

Robert Joseph Evans commented on MAPREDUCE-2727:
------------------------------------------------

+1 the patch looks fairly simple and straight forward even without tests, but it would be nice to have a unit test or two to verify that it works.

> MR-279: SleepJob throws divide by zero exception when count = 0
> ---------------------------------------------------------------
>
>                 Key: MAPREDUCE-2727
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2727
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Jeffrey Naisbitt
>            Assignee: Jeffrey Naisbitt
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-2727.patch
>
>
> When the count is 0 for mappers or reducers, a divide-by-zero exception is thrown.  There are existing checks to error out when count < 0, which obviously doesn't handle the 0 case.  This is causing the MRReliabilityTest to fail.

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