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https://issues.apache.org/jira/browse/KAFKA-3133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-3133.
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Resolution: Fixed
Fix Version/s: 0.10.0.0
Issue resolved by pull request 912
[https://github.com/apache/kafka/pull/912]
> Add putIfAbsent function to KeyValueStore
> -----------------------------------------
>
> Key: KAFKA-3133
> URL: https://issues.apache.org/jira/browse/KAFKA-3133
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Guozhang Wang
> Fix For: 0.10.0.0
>
>
> Since a local store will only be accessed by a single stream thread, there is
> no atomicity concerns and hence this API should be easy to add.
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