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https://issues.apache.org/jira/browse/HADOOP-4979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vivek Ratan updated HADOOP-4979:
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Attachment: 4979.1.patch
Simple fix in 4979.1.patch.
> Capacity Scheduler does not always return no task to a TT if a job's memry
> requirements are not met
> ---------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4979
> URL: https://issues.apache.org/jira/browse/HADOOP-4979
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Vivek Ratan
> Attachments: 4979.1.patch
>
>
> As per HADOOP-4035, the Capacity Scheduler should return no task to a TT if a
> job's high mem requirements are not met. This doesn't always happen. In the
> Scheduler's assignTasks() method, if a job's map task does not enough memory
> to run, the Scheduler looks at reduce tasks, and vice-versa. This can result
> in a case where a reduce task from another job is returned to the TT (if the
> high-mem job does not have a reduce task to run, for example), thus starving
> the high-mem job.
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