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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-5883) TaskMemoryMonitorThread might shoot down tasks even if their processes momentarily exceed the requested memory
Date Thu, 28 May 2009 06:39:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hemanth Yamijala resolved HADOOP-5883.
--------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.20.1
         Assignee: Hemanth Yamijala
     Hadoop Flags: [Reviewed]

I just committed this to trunk and branch 0.20.

> 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
>            Assignee: Hemanth Yamijala
>             Fix For: 0.20.1
>
>         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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