Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2400
Hi @wangzhijiang999! `ActorSystem` and `LeaderRetrievalService` should only
every appear in the factory (startTaskManagerComponentsAndActor) which bring up
the TaskExecutor component. The TaskExecutor itself uses the new classes
`RpcService` and `HighAvailabilityService`. All other code should change much,
except for the Scala->Java changes.
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