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https://issues.apache.org/jira/browse/HADOOP-3533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604376#action_12604376
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Owen O'Malley commented on HADOOP-3533:
---------------------------------------

The problem is that JobTracker and TaskTracker are very wide interfaces. I'd 
much rather have users use JobClient and access the JobTracker via that 
interface than the JobTracker directly.

> The api to JobTracker and TaskTracker have changed incompatibly
> ---------------------------------------------------------------
>
>                 Key: HADOOP-3533
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3533
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: compat.patch
>
>
> The JobTracker and TaskTracker classes are currently both public, and while 
> working on HADOOP-3532, I discovered that their API's have been changed 
> incompatibly. I believe the best course of action is to make their visibility 
> package private.
> Thoughts?

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