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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1227) Allow JobTracker to pause task scheduling
Date Fri, 20 Nov 2009 21:13:40 GMT
Allow JobTracker to pause task scheduling
-----------------------------------------

                 Key: MAPREDUCE-1227
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1227
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
    Affects Versions: 0.22.0
            Reporter: Dmytro Molkov


We want to have an ability to pause task scheduling in JobTracker.

The idea is: make job tracker still accept new jobs, but delay their running and do not schedule
any new tasks from the currently running jobs.

It will help for example restarting the DFS cluster without affecting jobs: pause execution,
restart the DFS, running tasks will fail, but will not be scheduled until the execution is
resumed, so the job does not fail.

In general it should help fix non MR problems (DFS, network, etc.) while not failing running
jobs and keep accepting new ones.

What do people think of the general idea?

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