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https://issues.apache.org/jira/browse/KAFKA-5054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16513135#comment-16513135
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Matthias J. Sax commented on KAFKA-5054:
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There was a PR that got merged IMHO. I think we can close this with fixed
version 2.0. \cc [~damianguy] [~guozhang]
> ChangeLoggingKeyValueByteStore delete and putIfAbsent should be synchronized
> ----------------------------------------------------------------------------
>
> Key: KAFKA-5054
> URL: https://issues.apache.org/jira/browse/KAFKA-5054
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Damian Guy
> Assignee: Damian Guy
> Priority: Critical
> Fix For: 2.1.0
>
>
> {{putIfAbsent}} and {{delete}} should be synchronized as they involve at
> least 2 operations on the underlying store and may result in inconsistent
> results if someone were to query via IQ
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