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https://issues.apache.org/jira/browse/FLINK-26853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roman Khachatryan reassigned FLINK-26853:
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Assignee: Hangxiang Yu
> 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
> Assignee: Hangxiang Yu
> Priority: Minor
> Labels: pull-request-available
>
> 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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