Mailing-List: contact mapreduce-dev-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: mapreduce-dev@hadoop.apache.org
Message-ID: <386076736.1258751620643.JavaMail.jira@brutus>
Date: Fri, 20 Nov 2009 21:13:40 +0000 (UTC)
From: "Dmytro Molkov (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-1227) Allow JobTracker to pause task
 scheduling
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

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?

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.