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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5725) TaskTracker shuold run user tasks nicely in the local machine
Date Thu, 23 Apr 2009 17:18:30 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702016#action_12702016

Tsz Wo (Nicholas), SZE commented on HADOOP-5725:

Here is my experience:
I had jobs with tasks expected to run ~30 minutes.  However, there were some CPU intensive
tasks from other jobs running in the cluster.  If my task got scheduled to the same machine
with these CPU intensive tasks, my tasks might run 2 or more hours.  In some cases, the task
got timeout or lost TaskTracker.

> TaskTracker shuold run user tasks nicely in the local machine
> -------------------------------------------------------------
>                 Key: HADOOP-5725
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5725
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Tsz Wo (Nicholas), SZE
> If one task tried to use all CPUs in a local machine, all other tasks or processes (includes
tasktracker and datanode daemons) may hardly get a chance to run.

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