Github user EronWright commented on the issue:
https://github.com/apache/flink/pull/4260
My take on this skeleton is that the `Dispatcher` should not use the
`JobManagerRunner` directly. My rationale is:
1. The dispatcher should never execute user code, otherwise it cannot truly
support multi-user scenarios.
2. The runner is a concrete class that acts as a bootstrap for the JM, to
be used in the same process as the JM. But the dispatcher must support remote
JM execution.
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