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Posted to issues@flink.apache.org by "Yun Tang (Jira)" <ji...@apache.org> on 2022/04/25 06:30:00 UTC

[jira] [Resolved] (FLINK-23252) Support recovery (from checkpoints) after disabling changelog backend

     [ https://issues.apache.org/jira/browse/FLINK-23252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yun Tang resolved FLINK-23252.
------------------------------
    Resolution: Fixed

merged in master: 7b48eae6b448963e0aed2b33d06e105311a48e05 and ece745c39eaee7caaa1a9d077f079543cb088f67

> Support recovery (from checkpoints) after disabling changelog backend
> ---------------------------------------------------------------------
>
>                 Key: FLINK-23252
>                 URL: https://issues.apache.org/jira/browse/FLINK-23252
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Runtime / State Backends
>            Reporter: Roman Khachatryan
>            Assignee: Hangxiang Yu
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.16.0
>
>
> Recovery from savepoint already works:
>  * changelog off -> on: FLINK-23278
>  * changelog on -> off: directly calling {{{}underlyingBackend.{}}}{{{}savepoint{}}}{{{}(){}}} (instead of {{{}writer.persist(){}}}) 
>  
> For checkpoints, changelog on -> off doesn't work. Regular state backend will receive materialized and non-aterialized state on recovery. To support it, state changes have to be applied on recovery even if changelog backend is disabled.
> Another obstacle could be that wrapped backend state handles created during materialization can refer to a fake checkpoint ID. This fake checkpoint ID would then be passed to e.g. RocksIncrementalSnapshotStrategy on restore.



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