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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 00:56:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-4309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15036979#comment-15036979

Sidharta Seethana commented on YARN-4309:

hi [~vvasudev],

I am using the find command that you have in the patch against broken symlinks - it is not
clear to me how broken symlink info is captured (please see below). Could you please clarify?

q (19:50:35) ~/symlink-test$ ls -l
total 0
q (19:50:47) ~/symlink-test$ ln -s world hello
q (19:51:03) ~/symlink-test$ find -L . -maxdepth 5 -type l -ls
2149279432    0 lrwxrwxrwx   1 sseethana sseethana        5 Dec  2 19:51 ./hello -> world
q (19:51:15) ~/symlink-test$ echo $?
q (19:51:52) ~/symlink-test$ uname -a
Linux q 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

> 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,
> 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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