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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-322) Need a job control utility to submit and monitor a group of jobs which have DAG dependency
Date Wed, 28 Jun 2006 20:35:30 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-322?page=comments#action_12418309 ] 

Doug Cutting commented on HADOOP-322:
-------------------------------------

I think the 'try' block should be removed from your test.  Otherwise it will never fail, no?
 Instead it should be permitted to throw exceptions if it fails, so that unit tests will fail.

> Need a job control utility to submit and monitor a group of jobs which have DAG dependency
> ------------------------------------------------------------------------------------------
>
>          Key: HADOOP-322
>          URL: http://issues.apache.org/jira/browse/HADOOP-322
>      Project: Hadoop
>         Type: New Feature

>     Reporter: Runping Qi
>     Assignee: Runping Qi
>  Attachments: job_control_patch.txt
>
> In my applications, some jobs depend on the outputs of other jobs. Therefore, job dependency
forms a DAG. A job is ready to run if and only if it does not have any dependency or all the
jobs it depends are finished successfully. To help schedule and monitor a group of jobs like
that, I am thinking of implementing a utility that:
> 	- accept jobs with dependency specification
>       - monitor job status
>       - submit jobs when they are ready
> With such a utility, the application can construct its jobs, specify their dependency
and then hand the jobs to the utility class. The utility takes care of the details of job
submission.
> I'll post my design skech for comments/suggestion.
> Eventually, I'll submit a patch for the utility.

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