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https://issues.apache.org/jira/browse/MAPREDUCE-5979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069670#comment-14069670
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Hadoop QA commented on MAPREDUCE-5979:
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{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12657016/MAPREDUCE-5979.002.patch
against trunk revision .
{color:red}-1 patch{color}. The patch command could not apply the patch.
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4758//console
This message is automatically generated.
> MR1 FairScheduler zero weight can cause sort failures
> -----------------------------------------------------
>
> Key: MAPREDUCE-5979
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5979
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 1.2.1
> Reporter: Anubhav Dhoot
> Assignee: Anubhav Dhoot
> Attachments: MAPREDUCE-5979.001.patch, MAPREDUCE-5979.002.patch
>
>
> When the weight is set to zero (which is possible with a custom weight
> adjuster) we can get failures in comparing schedulables.
> This is because when calculating running tasks to weight ratio could result
> in a 0.0/0.0 which ends up as NaN. Comparisons with NaN are undefined such
> that (int)Math.signum(NaN - anyNumber) will be 0 causing different criteria
> to be used in comparison which may not be consistent. This will result in
> {{IllegalArgumentException: Comparison method violates its general contract!}}
>
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