Till Rohrmann created FLINK-9047:
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Summary: SlotPool can fail to release slots
Key: FLINK-9047
URL: https://issues.apache.org/jira/browse/FLINK-9047
Project: Flink
Issue Type: Bug
Components: Distributed Coordination
Affects Versions: 1.5.0
Reporter: Till Rohrmann
Fix For: 1.5.0
The {{SlotPool}} releases idling slots. If the release operation fails (e.g.
timeout), then it simply continues using the slot. This is problematic if the
owning {{TaskExecutor}} failed before and was unregistered in the meantime from
the {{SlotPool}}. As a result, the {{SlotPool}} will reuse the slot and
whenever it tries to return because it is idling it will fail again. This,
effectively, renders the scheduling of a job impossible.
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