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https://issues.apache.org/jira/browse/MAPREDUCE-729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728397#action_12728397
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Matei Zaharia commented on MAPREDUCE-729:
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All of these are optional in the fair scheduler by the way, so that it can also
run with a fake TT manager in unit tests. But if you think that some of these
should be put in the interface, go ahead, as it will simplify the code.
> Create a MapReduceMaster interface for the JobTracker
> -----------------------------------------------------
>
> Key: MAPREDUCE-729
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-729
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Fix For: 0.21.0
>
>
> It would be useful to have a 'master' interface which specifies all the
> interfaces exposed by the JobTracker to allow for mock-objects, simulation
> (MAPREDUCE-728) etc.
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