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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3581) Prevent memory intensive user tasks from taking down nodes
Date Mon, 30 Jun 2008 17:57:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609310#action_12609310
] 

Allen Wittenauer commented on HADOOP-3581:
------------------------------------------

What prevents the task tracker from overflowing memory itself?   Considering the memory leaks
we've already seen in the name node, I don't trust the task trackers to be leak free either.
 

One of the advantages that we have with HOD presently is that because the limit is set prior
to the task tracker getting launched is that the task tracker itself is bounded.  This makes
the *entire* hadoop task chain limited and not just individual portions.

Whatever system is designed needs to mimic this functionality. 

> Prevent memory intensive user tasks from taking down nodes
> ----------------------------------------------------------
>
>                 Key: HADOOP-3581
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3581
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod Kumar Vavilapalli
>
> Sometimes user Map/Reduce applications can get extremely memory intensive, maybe due
to some inadvertent bugs in the user code, or the amount of data processed. When this happens,
the user tasks start to interfere with the proper execution of other processes on the node,
including other Hadoop daemons like the DataNode and TaskTracker. Thus, the node would become
unusable for any Hadoop tasks. There should be a way to prevent such tasks from bringing down
the node.

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