Roman Khachatryan created FLINK-23143:
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Summary: Support state migration
Key: FLINK-23143
URL: https://issues.apache.org/jira/browse/FLINK-23143
Project: Flink
Issue Type: Sub-task
Components: Runtime / State Backends
Environment: ChangelogKeyedStateBackend.getOrCreateKeyedState is
currently used during recovery; on 1st user access, it doesn't update metadata
nor migrate state (as opposed to other backends).
The proposed solution is to
# wrap serializers (and maybe other objects) in getOrCreateKeyedState
# store wrapping objects in a new map keyed by state name
# pass wrapped objects to delegatedBackend.createInternalState
# on 1st user access, lookup wrapper and upgrade its wrapped serializer
This should be done for both KV/PQ states.
See also [https://github.com/apache/flink/pull/15420#discussion_r656934791]
cc: [~yunta]
Reporter: Roman Khachatryan
Fix For: 1.14.0
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