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https://issues.apache.org/jira/browse/FLINK-7683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182174#comment-16182174
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ASF GitHub Bot commented on FLINK-7683:
---------------------------------------
Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/4722#discussion_r141272559
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/KeyedStateBackend.java
---
@@ -37,6 +39,12 @@
void setCurrentKey(K newKey);
/**
+ * @return Stream of existing keys in the namespace.
--- End diff --
Nit: This could be changed to "Returns a stream of all keys for the given
state and namespace.". The first parameter should be renamed to `state` or
something like it because `field` is not used anywhere else, I think.
> 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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