Jason Lowe created YARN-5547:
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Summary: NMLeveldbStateStore should be more tolerant of unknown
keys
Key: YARN-5547
URL: https://issues.apache.org/jira/browse/YARN-5547
Project: Hadoop YARN
Issue Type: Improvement
Components: nodemanager
Affects Versions: 2.6.0
Reporter: Jason Lowe
Whenever new keys are added to the NM state store it will break rolling
downgrades because the code will throw if it encounters an unrecognized key.
If instead it skipped unrecognized keys it could be simpler to continue
supporting rolling downgrades. We need to define the semantics of unrecognized
keys when containers and apps are cleaned up, e.g.: we may want to delete all
keys underneath an app or container directory when it is being removed from the
state store to prevent leaking unrecognized keys.
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