Till Rohrmann created FLINK-8629:

             Summary: Allow JobMaster to rescale jobs
                 Key: FLINK-8629
                 URL: https://issues.apache.org/jira/browse/FLINK-8629
             Project: Flink
          Issue Type: New Feature
          Components: Distributed Coordination
    Affects Versions: 1.5.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann
             Fix For: 1.5.0

The {{JobMaster}} should be able to rescale a job or a subset of its operators. 
In order to do that we have to expose RPC calls to trigger this action.

The rescaling works by first taking a savepoint, then suspending the old job, 
rescale it and then restart it from the taken savepoint.

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