TisonKun opened a new pull request #6729: [FLINK-10386] [taskmanager] Remove legacy class TaskExecutionStateListener URL: https://github.com/apache/flink/pull/6729 ## What is the purpose of the change After a discussion [here](https://github.com/apache/flink/commit/0735b5b935b0c0757943e2d58047afcfb9949560#commitcomment-30584257) with @tillrohrmann . I start to analyze the usage of `ActorGatewayTaskExecutionStateListener` and `TaskExecutionStateListener`. In conclusion, we abort `TaskExecutionStateListener` strategy and no any component rely on it. Instead, we introduce `TaskManagerActions` to take the role for the communication of `Task` with `TaskManager`. No one except `TaskManager` should directly communicate with `Task`. So it can be safely remove legacy class `TaskExecutionStateListener`. ## Brief change log - Wholly Remove `ActorGatewayTaskExecutionStateListener.java` and `TaskExecutionStateListener.java` - Graceful remove inactive usage of these class in `Task.java` - Refine `TaskTest.java` and `StreamTaskTest.java` ## Verifying this change Since it is a removal, make sure existing tests pass is enough. cc @tillrohrmann @GJL @twalthr
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