Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2571
As discussed in this PR, I've pushed the following changes:
1. Move the slot registration and allocation report to the registration
of the TaskExecutor
2. Let the TaskExecutor immediately notify the ResourceManager once a
slot becomes free. The ResourceManager has to confirm this
notification. Otherwise, the future slot allocations will be blocked
because the
ResourceManager's state is not in sync.
3. Change the fencing in handleSlotRequestFailedAtTaskManager to protect
against TaskExecutors which are not registered anymore.
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