[jira] [Updated] (FLINK-26853) HeapStateBackend ignores metadata updates in certain cases

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-26853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-26853:
-----------------------------------
    Labels: pull-request-available  (was: )

> 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
>            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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