Till Rohrmann created FLINK-9324:
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Summary: SingleLogicalSlot returns completed release future before
slot is properly returned
Key: FLINK-9324
URL: https://issues.apache.org/jira/browse/FLINK-9324
Project: Flink
Issue Type: Bug
Components: Distributed Coordination
Affects Versions: 1.5.0, 1.6.0
Reporter: Till Rohrmann
Assignee: Till Rohrmann
Fix For: 1.5.0
The {{SingleLogicalSlot#releaseSlot}} method returns a future which is
completed once the slot has been returned to the {{SlotOwner}}. Unfortunately,
we don't wait for the {{SlotOwner's}} response to complete the future but
complete it directly after the call has been made. This causes that the
{{ExecutionGraph}} can get restarted in case of a recovery before all of its
slots have been returned to the {{SlotPool}}. As a consequence, the allocation
of the new tasks might require more than the max parallelism because of
collisions with old tasks (in case of slot sharing).
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