Till Rohrmann created FLINK-9908:
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Summary: Inconsistent state of SlotPool after ExecutionGraph cancellation
Key: FLINK-9908
URL: https://issues.apache.org/jira/browse/FLINK-9908
Project: Flink
Issue Type: Bug
Affects Versions: 1.5.1, 1.6.0, 1.7.0
Reporter: Till Rohrmann
Assignee: Till Rohrmann
Fix For: 1.5.2, 1.6.0, 1.7.0
If the {{ExecutionGraph}} is concurrently scheduled and cancelled, it can happen that requested
{{Slots}} are not properly returned to the {{SlotPool}}. This causes an inconsistent state
of the {{SlotPool}} where it thinks that some of its slots are still occupied even though
the respective {{Execution}} has already been cancelled.
The problem seems to be caused by propagating the cancellation of the overall scheduling future
to the individual scheduling futures. If the individual scheduling future is cancelled, then
the callback which produces its value and also handles the failure case won't be called.
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