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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4350) Ability to pause/resume jobs
Date Mon, 06 Oct 2008 10:49:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637070#action_12637070
] 

Amar Kamat commented on HADOOP-4350:
------------------------------------

HADOOP-3687 will be useful to HADOOP-4350. When a _job- pause_ is issued, we should ideally
pause the tasks also instead of killing or waiting for their completion. But with scheduler
in the picture, there will be lot of jobs running simultaneously and hence killing the current
wave of tasks for a job should not affect the job as such.

> Ability to pause/resume jobs
> ----------------------------
>
>                 Key: HADOOP-4350
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4350
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Amar Kamat
>            Assignee: Amar Kamat
>
> Consider a case where the user job depends on some external entity/service like a database
or a web service. If the service needs restart or encounters a failure, the user should be
able to pause the job and resume only when the service is up. This will be better than re-executing
the whole job. Hence there should be some way to pause/resume jobs (from web-ui/command line)
etc.

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