Roman Khachatryan created FLINK-26853:
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Summary: HeapStateBackend ignores metadata updates in certain cases
Key: FLINK-26853
URL: https://issues.apache.org/jira/browse/FLINK-26853
Project: Flink
Issue Type: Bug
Components: Runtime / State Backends
Affects Versions: 1.14.4, 1.15.0, 1.16.0
Reporter: Roman Khachatryan
On recovery, HeapRestoreOperation reads state handles one by one;
* each handle contains metadata at the beginning;
* the metadata is always read, but not actually used if a state with the
corresponding name was already registered
In a rare case of downscaling + multiple checkpoints with different metadata;
this might lead to data being deserialized incorrectly (always using the
initial metadata).
It also prevents incremental checkpoints with schema evolution.
On first access, however, the backend itself will update (merge) metadata; so
that it doesn't affect new state updates.
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