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https://issues.apache.org/jira/browse/KAFKA-6487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16346831#comment-16346831
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Bart De Vylder commented on KAFKA-6487:
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[~bbejeck] i started working on this issue before I saw this ticket. I made a
PR for it here: [https://github.com/apache/kafka/pull/4495]
> ChangeLoggingKeyValueBytesStore.all() returns null
> --------------------------------------------------
>
> Key: KAFKA-6487
> URL: https://issues.apache.org/jira/browse/KAFKA-6487
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 1.0.0
> Reporter: Bill Bejeck
> Assignee: Bill Bejeck
> Priority: Major
>
> The {{ChangeLoggingKeyValueBytesStore}} implements the {{KeyValueStore}}
> interface which extends the {{ReadOnlyKeyValueStore}} interface. The Javadoc
> for {{ReadOnlyKeyValueStore#all}} states the method should never return a
> {{null}} value.
> But when deleting a record from the {{ChangeLoggingKeyValueBytesStore}} and
> subsequently calling the {{all}} method, a null value is returned.
>
> https://issues.apache.org/jira/browse/KAFKA-4750 is a related issue
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