Github user EronWright commented on the issue:
https://github.com/apache/flink/pull/4560
@tillrohrmann fixed the test issue and other noted issues. Once #4555 is
in, this is good to go.
The test issue was a race in RM acquiring leadership vs RPC call. Added
some code to `TestLeaderElectionService` to wait for leader ack and updated the
base RM and Mesos RM to use it.
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