Github user EronWright commented on the issue:
https://github.com/apache/flink/pull/4261
Looking at the various diagrams of FLIP-6, there's quite a few possible
arrangements of the 'building blocks'. I wonder if composition over
inheritance would be preferable as we develop the other modes. Maybe an
approach similar to traits
[example](https://opencredo.com/traits-java-8-default-methods/) to be mixed in
to subclasses of `ClusterEntrypoint`.
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