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