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Posted to issues@flink.apache.org by "Till Rohrmann (JIRA)" <ji...@apache.org> on 2019/01/03 09:42:00 UTC

[jira] [Commented] (FLINK-11254) Unify serialization format of savepoint for switching state backends

    [ https://issues.apache.org/jira/browse/FLINK-11254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16732811#comment-16732811 ] 

Till Rohrmann commented on FLINK-11254:
---------------------------------------

Thanks for opening this issue [~klion26]. Before starting with the implementation this feature will require a thorough design discussion. There are many subtle things which one needs to consider. For example, one problem is that {{RocksDB}} stores merged state differently than the {{HeapStateBackend}} (it inserts a commas between elements).

Thus, the first thing would be to write to the dev ML to ask that community whether there is committer willing to shepherd this effort.

> Unify serialization format of savepoint for switching state backends
> --------------------------------------------------------------------
>
>                 Key: FLINK-11254
>                 URL: https://issues.apache.org/jira/browse/FLINK-11254
>             Project: Flink
>          Issue Type: Improvement
>    Affects Versions: 1.7.1
>            Reporter: Congxian Qiu
>            Assignee: Congxian Qiu
>            Priority: Major
>
> For the current version, the serialization formats of savepoint between HeapKeyedStateBackend and RocksDBStateBackend are different, so we can not switch state backend when using savepoint. We should unify the serialization formats of the savepoint to support state backend switch.



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