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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 Tue, 27 Jun 2006 19:09:30 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-322?page=comments#action_12418092 ] 

Doug Cutting commented on HADOOP-322:

This looks like a nice addition to Hadoop.  I'd like to see some unit tests added before it
is committed.  Also, tabs are used for indentation, when spaces are preferred.

> 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
> I'll post my design skech for comments/suggestion.
> Eventually, I'll submit a patch for the utility.

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