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https://issues.apache.org/jira/browse/HADOOP-5883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713392#action_12713392
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Hemanth Yamijala commented on HADOOP-5883:
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Ran tests against the 20 branch. TestDistributedFileSystem failed, but the
patch in no way touches code in this test case. All other tests passed. I will
commit this fix.
> TaskMemoryMonitorThread might shoot down tasks even if their processes
> momentarily exceed the requested memory
> --------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-5883
> URL: https://issues.apache.org/jira/browse/HADOOP-5883
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Hemanth Yamijala
> Attachments: HADOOP-5883-20.patch, HADOOP-5883-20.patch,
> HADOOP-5883.patch, HADOOP-5883.patch, HADOOP-5883.patch
>
>
> Currently the TaskMemoryMonitorThread kills tasks as soon as it detects they
> are consuming more memory than the max value specified. There are valid cases
> (see HADOOP-5059) where if a program is executed from the task, it might
> momentarily occupy twice the amount of memory for a short time. Ideally the
> monitoring thread should handle this case.
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