[jira] Commented: (HADOOP-4521) A JobInProgressLIstener can change a job without informing other listeners

["Amar Kamat (JIRA)" <ji...@apache.org>]

    [ 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:
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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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