[jira] [Commented] (OOZIE-1388) Add a admin servlet to show thread stack trace and CPU usage per thread

["Rohini Palaniswamy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OOZIE-1388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13729941#comment-13729941 ] 

Rohini Palaniswamy commented on OOZIE-1388:
-------------------------------------------

Best way to debug such cases is

http://nurkiewicz.blogspot.com/2012/08/which-java-thread-consumes-my-cpu.html 
http://ileriseviye.wordpress.com/2012/08/28/variation-on-a-theme-which-java-thread-consumes-the-most-of-your-cpu/

This information is not available via Java APIs though unless we use sun.jvm.hotspot classes (https://gist.github.com/rednaxelafx/843622) which will not be compatible with non-sun jvms. Added a simple page that shows memory information, thread stack traces and thread cpu and user time for a given period. This will still be very useful. 

Page can be accessed as http://localhost:11000/oozie/admin/jvminfo.jsp
                
> Add a admin servlet to show thread stack trace and CPU usage per thread
> -----------------------------------------------------------------------
>
>                 Key: OOZIE-1388
>                 URL: https://issues.apache.org/jira/browse/OOZIE-1388
>             Project: Oozie
>          Issue Type: Improvement
>            Reporter: Rohini Palaniswamy
>            Assignee: Rohini Palaniswamy
>         Attachments: OOZIE-1388-1.patch
>
>
> ThreadMXBean can be used to display the stack trace and also CPU usage per thread. The servlet will be very useful for debugging.

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