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From "Vivek Ratan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4523) Enhance how memory-intensive user tasks are handled
Date Mon, 10 Nov 2008 08:38:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646203#action_12646203
] 

Vivek Ratan commented on HADOOP-4523:
-------------------------------------

bq. Should we really be picking up enough tasks to kill ?

Yes. Kill one or more so you go below the limit, as mentioned in the summary in HADOOP-4035.


> Enhance how memory-intensive user tasks are handled
> ---------------------------------------------------
>
>                 Key: HADOOP-4523
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4523
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.19.0
>            Reporter: Vivek Ratan
>            Assignee: Vinod K V
>         Attachments: HADOOP-4523-200811-05.txt, HADOOP-4523-200811-06.txt
>
>
> HADOOP-3581 monitors each Hadoop task to see if its memory usage (which includes usage
of any tasks spawned by it and so on) is within a per-task limit. If the task's memory usage
goes over its limit, the task is killed. This, by itself, is not enough to prevent badly behaving
jobs from bringing down nodes. What is also needed is the ability to make sure that the sum
total of VM usage of all Hadoop tasks does not exceed a certain limit.

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