[jira] Updated: (HADOOP-2947) [HOD] Hod should redirect stderr and stdout of Hadoop daemons to assist debugging

["Vinod Kumar Vavilapalli (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-2947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod Kumar Vavilapalli updated HADOOP-2947:
--------------------------------------------

    Attachment: HADOOP-2947

Attaching a patch. stdout and stderr are now saved along with hadoop.log in the hadoop log directory. Thus, stdout is redirected to $HADOOP_LOG_DIR/<daemon-name>.out and stderr to $HADOOP_LOG_DIR/<daemon-name>.err. 

Made changes to simpleCommand to enable starting commands with stderr and/or stdout set. And made related changes in HadoopCommand.

Added testcases. Also tested by giving a sigquit to jobtracker and verifying that the standard output indeed goes to the jobtracker.out file. Didn't get to check stderr.

> [HOD] Hod should redirect stderr and stdout of Hadoop daemons to assist debugging
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-2947
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2947
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: contrib/hod
>    Affects Versions: 0.16.0
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod Kumar Vavilapalli
>             Fix For: 0.17.0
>
>         Attachments: HADOOP-2947
>
>
> Copied from internal bug details from Koji:
> ==========================
> Sometimes JobTracker/TaskTracker starts consuming 99% cpu and stops responding to 'jstack' call.  In those cases,
> usually it still responds to kill -QUIT signal which forces the jvm to dump the stack to stdout.  
> Please have the stdout of JT/TT redirected to a file. 
> Adding stderr. 
> If thread has an uncaught exception, it prints out to stderr and dies.
> ==========================

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