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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-492) Too many open files error to launch a container
Date Wed, 20 Mar 2013 16:47:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607841#comment-13607841

Robert Joseph Evans commented on YARN-492:

It sounds to me almost like it is log aggregation. If you launch lots of these in a tight
loop it is likely that you are still aggregating the logs from the first few, while launching
new ones very quickly.  If log aggregation cannot keep up you will run out of file descriptors.
 Try turning off log aggregation and see what happens.
> Too many open files error to launch a container
> -----------------------------------------------
>                 Key: YARN-492
>                 URL: https://issues.apache.org/jira/browse/YARN-492
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>         Environment: RedHat Linux
>            Reporter: Krishna Kishore Bonagiri
> I am running a date command with YARN's distributed shell example in a loop of 1000 times
in this way:
> yarn jar /home/kbonagir/yarn/hadoop-2.0.0-alpha/share/hadoop/mapreduce/hadoop-yarn-applications-distributedshell-2.0.0-alpha.jar
org.apache.hadoop.yarn.applications.distributedshell.Client --jar /home/kbonagir/yarn/hadoop-2.0.0-alpha/share/hadoop/mapreduce/hadoop-yarn-applications-distributedshell-2.0.0-alpha.jar
--shell_command date --num_containers 2
> Around 730th time or so, I am getting an error in node manager's log saying that it failed
to launch container because there are "Too many open files" and when I observe through lsof
command,I find that there is one instance of this kind of file is left for each run of Application
Master, and it kept growing as I am running it in loop.
> node1:44871->node1:50010
> Thanks,
> Kishore

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