[jira] [Created] (FLINK-19832) Improve handling of immediately failed physical slot in SlotSharingExecutionSlotAllocator

["Andrey Zagrebin (Jira)" <ji...@apache.org>]

Andrey Zagrebin created FLINK-19832:
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             Summary: Improve handling of immediately failed physical slot in SlotSharingExecutionSlotAllocator
                 Key: FLINK-19832
                 URL: https://issues.apache.org/jira/browse/FLINK-19832
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Coordination
    Affects Versions: 1.12.0
            Reporter: Andrey Zagrebin
            Assignee: Andrey Zagrebin


Improve handling of immediately failed physical slot in SlotSharingExecutionSlotAllocator

If a physical slot future the immediately fails for a new SharedSlot in SlotSharingExecutionSlotAllocator#getOrAllocateSharedSlot but we continue to add logical slots to this SharedSlot, eventually, the logical slot also fails and gets removed from {{the SharedSlot}} which gets released (state RELEASED). The subsequent logical slot addings in the loop of {{allocateLogicalSlotsFromSharedSlots}} will fail the scheduling
with the ALLOCATED state check because it will be RELEASED.

The subsequent bulk timeout check will also not find the SharedSlot and fail with NPE.

Hence, such SharedSlot with the immediately failed physical slot future should not be kept in the SlotSharingExecutionSlotAllocator and the logical slot requests depending on it can be immediately returned failed. The bulk timeout check does not need to be started because if some physical (and its logical) slot requests failed then the whole bulk will be canceled by scheduler.

If the last assumption is not true for the future scheduling, this bulk failure might need additional explicit pending requests cancelation. We expect to refactor it for the declarative scheduling anyways.



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