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https://issues.apache.org/jira/browse/HADOOP-4653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647266#action_12647266
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Amar Kamat commented on HADOOP-4653:
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+1 for throwing an exception. In the web-ui we should disable such invalid
operations like
- changing priority for completed jobs
- killing completed jobs (?)
> Changing priority of a completed job causes problems in JobInProgressListeners
> ------------------------------------------------------------------------------
>
> Key: HADOOP-4653
> URL: https://issues.apache.org/jira/browse/HADOOP-4653
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Hemanth Yamijala
>
> If the priority of a completed job is changed, a {{JobChangeEvent}} is raised
> and the {{JobInProgressListeneners}}, like the capacity scheduler, are
> notified. Most implementations handle the event by re-sorting their data
> structures, and thus could end up re-inserting the completed job into their
> lists.
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