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From "Mohammad Kamrul Islam (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5723) MR AM container log empty if exception occurs
Date Thu, 16 Jan 2014 07:53:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13873130#comment-13873130
] 

Mohammad Kamrul Islam commented on MAPREDUCE-5723:
--------------------------------------------------

* No new functionality is added. Therefore,no new test case is required. But I tested it in
a cluster setup.

Failed test case: It is unrelated to this change. There is a separate JIRA to address this
issue:
 https://issues.apache.org/jira/browse/MAPREDUCE-5719



> MR AM container log empty if exception occurs
> ---------------------------------------------
>
>                 Key: MAPREDUCE-5723
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5723
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster
>    Affects Versions: 2.2.0
>            Reporter: Mohammad Kamrul Islam
>            Assignee: Mohammad Kamrul Islam
>             Fix For: trunk, 2.2.0
>
>         Attachments: MAPREDUCE-5723.1.patch, MAPREDUCE-5723.2.patch, MAPREDUCE-5723.3.patch
>
>
> It occurs when the property "mapreduce.task.userlog.limit.kb" is set non-zero in mapped-site.xml.
> AM container syslog remains empty if any exception occurs. 
> Bug details:
> In MRAppMaster.java, the following code snippets show the bug.
> {code}
>     } catch (Throwable t) {
>        LOG.fatal("Error starting MRAppMaster", t);
>       System.exit(1);
>     }finally {
>        LogManager.shutdown();
>     }
> {code}
> In the catch block, we are exiting the JVM. So finally block (therefore LogManager.shutdown())
is never executed.
> Possible fix: 
> Make sure LogManager.shutdown() is executed in all cases.
>  



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