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https://issues.apache.org/jira/browse/FLINK-7683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182475#comment-16182475
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ASF GitHub Bot commented on FLINK-7683:
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Github user pnowojski commented on the issue:
https://github.com/apache/flink/pull/4722
We have got carried away with those concurrent modifications and snapshots.
To rewrite keyed state variable from an old to a new one, old is used as a read
only. Thus `getKeys` for the the old one doesn't have to care about any
modifications.
I have reverted snapshot rocks db changes.
> Add method to iterate over all of the existing keys in a statebackend
> ---------------------------------------------------------------------
>
> Key: FLINK-7683
> URL: https://issues.apache.org/jira/browse/FLINK-7683
> Project: Flink
> Issue Type: New Feature
> Components: State Backends, Checkpointing
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
>
> This is required to make possible preserving backward compatibility while
> changing state definition of a keyed state operator (to do so operator must
> iterate over all of the existing keys and rewrites them into a new state
> variable).
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