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https://issues.apache.org/jira/browse/MAPREDUCE-5979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karthik Kambatla updated MAPREDUCE-5979:
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Summary: FairScheduler: zero weight can cause sort failures (was: MR1
FairScheduler zero weight can cause sort failures)
> 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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