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