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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4521) A JobInProgressLIstener can change a job without informing other listeners
Date Thu, 20 Nov 2008 04:38:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649258#action_12649258
] 

Amar Kamat commented on HADOOP-4521:
------------------------------------

Hemanth, the reason for introducing {{JobListenerManager}} is that we need not expose {{TaskTrackerManager}}
to {{JobInProgressListener}}. Also {{JobListenerManager}} and {{TaskTrackerManager}} can evolve
independently i.e we can change {{JobListenerManager}} along with scheduler without changing
{{TaskTrackerManager}}. 

> A JobInProgressLIstener can change a job without informing other listeners
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-4521
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4521
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Amar Kamat
>
> As of now the {{JobInProgressListener}} adds itself to the {{JobTracker}} and gets updated/informed.
Some of there {{JobInProgressListener}}'s control these changes/events (e.g.  {{EagerTaskInitializer}}).
The issue with this model is that a listener can change the job without informing other listeners.


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