tillrohrmann opened a new pull request #8795: [BP-1.7][FLINK-12863][FLINK-12865] Remove concurrency from HeartbeatManager(Sender)Impl URL: https://github.com/apache/flink/pull/8795 Backport of #8783 to `release-1.7`. Note that we cannot remove the `CompletableFuture` from the `HeartbeatListener` because we need to ask the `SlotPool` for the `AllocatedSlotProfile` and the `SlotPool` is still a separate `RpcEndpoint`. However since we also register the slots on the `SlotPool` for which we need to switch the thread boundaries, the order should be maintained as long as we execute everything else in the `JobMaster's` main thread.
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