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From "Amareshwari Sri Ramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1857) Ability to run a script when a task fails to capture stack traces
Date Thu, 04 Oct 2007 06:17:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532337
] 

Amareshwari Sri Ramadasu commented on HADOOP-1857:
--------------------------------------------------

Default behavior:

Java programs:
  Stdout, stderr are shown on job UI.

Pipes:
  Stdout, stderr are shown on the job UI.
  Default gdb script is run which print info abt threads. Thread Id and function in which
it was running when task failed. And prints stack tarce where task has failed.

Streaming:
 Stdout, stderr are shown on the Job UI.
 The exception details are shown on task diagnostics.

> Ability to run a script when a task fails to capture stack traces
> -----------------------------------------------------------------
>
>                 Key: HADOOP-1857
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1857
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.14.0
>            Reporter: Amareshwari Sri Ramadasu
>            Assignee: Amareshwari Sri Ramadasu
>             Fix For: 0.15.0
>
>         Attachments: patch-1857.txt, patch-1857.txt, patch-1857.txt, patch-1857.txt,
patch1857.txt
>
>
> This basically is for providing a better user interface for debugging failed
> jobs. Today we see stack traces for failed tasks on the job ui if the job
> happened to be a Java MR job. For non-Java jobs like Streaming, Pipes, the
> diagnostic info on the job UI is not helpful enough to debug what might have
> gone wrong. They are usually framework traces and not app traces.
> We want to be able to provide a facility, via user-provided scripts, for doing
> post-processing on task logs, input, output, etc. There should be some default
> scripts like running core dumps under gdb for locating illegal instructions,
> the last few lines from stderr, etc.  These outputs could be sent to the
> tasktracker and in turn to the jobtracker which would then display it on the
> job UI on demand.

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