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Posted to issues@flink.apache.org by "Roman Khachatryan (Jira)" <ji...@apache.org> on 2022/01/27 13:53:00 UTC

[jira] [Updated] (FLINK-23143) Support state migration

     [ https://issues.apache.org/jira/browse/FLINK-23143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Roman Khachatryan updated FLINK-23143:
--------------------------------------
        Parent:     (was: FLINK-21352)
    Issue Type: Technical Debt  (was: Sub-task)

> Support state migration
> -----------------------
>
>                 Key: FLINK-23143
>                 URL: https://issues.apache.org/jira/browse/FLINK-23143
>             Project: Flink
>          Issue Type: Technical Debt
>          Components: Runtime / State Backends
>            Reporter: Roman Khachatryan
>            Priority: Minor
>             Fix For: 1.15.0
>
>
> 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]



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