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From "Sidharta Seethana (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4309) Add debug information to application logs when a container fails
Date Thu, 03 Dec 2015 01:22:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-4309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15037019#comment-15037019
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Sidharta Seethana commented on YARN-4309:
-----------------------------------------

Ah, I guess the fact that it is listed implies the link is broken. I was thrown off by this
comment in the patch which seemed to imply find would exit with an error of some sort. 

{code}
      // don't run error check because if there are broken symlinks
      // or loops find will exit with an error
{code}

Also, do we need to worry about -L following links outside of the current directory? 

> Add debug information to application logs when a container fails
> ----------------------------------------------------------------
>
>                 Key: YARN-4309
>                 URL: https://issues.apache.org/jira/browse/YARN-4309
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>            Reporter: Varun Vasudev
>            Assignee: Varun Vasudev
>         Attachments: YARN-4309.001.patch, YARN-4309.002.patch, YARN-4309.003.patch, YARN-4309.004.patch,
YARN-4309.005.patch
>
>
> Sometimes when a container fails, it can be pretty hard to figure out why it failed.
> My proposal is that if a container fails, we collect information about the container
local dir and dump it into the container log dir. Ideally, I'd like to tar up the directory
entirely, but I'm not sure of the security and space implications of such a approach. At the
very least, we can list all the files in the container local dir, and dump the contents of
launch_container.sh(into the container log dir).
> When log aggregation occurs, all this information will automatically get collected and
make debugging such failures much easier.



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