Xintong Song created FLINK-18760:
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Summary: Redundant task managers should be released when there's
no job running in session cluster
Key: FLINK-18760
URL: https://issues.apache.org/jira/browse/FLINK-18760
Project: Flink
Issue Type: Improvement
Components: Runtime / Coordination
Affects Versions: 1.12.0
Reporter: Xintong Song
Assignee: Liu
Fix For: 1.12.0
In FLINK-18625, we introduced redundant task managers, as backup resources for
speeding up job recovery in cases of task manager lost.
For a session cluster, when there's no job running, it would be better to not
keep such redundant resources. Currently, Flink session cluster will not
request redundant task managers until a job is submitted, but it also will not
release redundant task managers after all jobs terminated.
This ticket proposes to check and release task managers if there are redundant
task managers only.
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