Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5427
Thanks a lot, looks good, can merge this now.
One quick question: You decided to have empty default implementations for
the new methods in the master hook interface. Given that Pravega is currently
the only known user of that interface, I would be okay with breaking the
interface (no default methods) if you think that would be cleaner.---
