tillrohrmann opened a new pull request #7295: [FLINK-10748] Decouple RestServerEndpoint from Dispatcher URL: https://github.com/apache/flink/pull/7295 ## What is the purpose of the change This commits decouples the RestServerEndpoint from the Dispatcher by converting the RedirectHandler into LeaderRetrievalHandler which only retrieves the gateway of the current leader instead of redirecting the client. This is possible since the serving RestServerEndpoint no longer needs to be colocated with the Dispatcher and JobMaster after all RPC requests are serializable (e.g. no direct access on the ExecutionGraph is needed). With this change every RestServerEndpoint will automatically proxy to the current leader without needing to redirect the requesting client. ## Brief change log - Remove redirection logic from `RedirectHandler` - Rename `RedirectHandler` into `LeaderRetrievalHandler` - Remove `restAddressFuture` from all REST handlers except for the `JarListHandler` ## Verifying this change - Tested manually - Adapted former `RedirectHandlerTest` which is now called `LeaderRetrievalHandlerTest` ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (no) - If yes, how is the feature documented? (not applicable)
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