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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4653) Changing priority of a completed job causes problems in JobInProgressListeners
Date Thu, 13 Nov 2008 11:45:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647263#action_12647263
] 

Hemanth Yamijala commented on HADOOP-4653:
------------------------------------------

Since the operation of changing the priority for a completed job does not make sense, I propose
this be stopped in the jobtracker itself, rather than having all listeners handle this case
as required.

We could:
- change the priority, but not notify if the job is completed
- not change the priority at all, and treat it as a no-op. The problem with this is that the
job client could treat this operation as successful, and lead to misleading results.
- throw an exception to indicate the operation is invalid.
- make setJobPriority return a boolean indicating Success/Failure. Unfortunately, would this
be a backwards incompatible change ?

Also, we need to make the web UI handle this.

Probably throwing an exception is the most feasible, yet correct solution. Thoughts ?

> 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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