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https://issues.apache.org/jira/browse/FLINK-7683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Nowojski closed FLINK-7683.
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> 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
> Fix For: 1.4.0
>
>
> 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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