[jira] [Created] (MAPREDUCE-5723) MR AM container log empty if exception occurs

["Mohammad Kamrul Islam (JIRA)" <ji...@apache.org>]

Mohammad Kamrul Islam created MAPREDUCE-5723:
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             Summary: 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


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.

} catch (Throwable t) {
       LOG.fatal("Error starting MRAppMaster", t);
      System.exit(1);
    }finally {
       LogManager.shutdown();
     }

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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