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https://issues.apache.org/jira/browse/KAFKA-6066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16207871#comment-16207871
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Guozhang Wang commented on KAFKA-6066:
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[~sriksun] which version of Kafka are you using? We have removed
SimpleDateFormat in the upcoming 1.0.0 release and it should not be an issue
any more. Could you double check the releasing RCs to confirm?
> Use of SimpleDateFormat in RocksDBWindowStore may not be Threadsafe
> -------------------------------------------------------------------
>
> Key: KAFKA-6066
> URL: https://issues.apache.org/jira/browse/KAFKA-6066
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Srikanth Sundarrajan
> Priority: Minor
>
> Currently SimpleDateFormat is used to construct segmentId from segmentName
> and vice-versa. This however may not be thread safe if WindowStore is
> accessed by more than one SteamTask/thread concurrently.
> Ref: *org.apache.kafka.streams.state.internals.RocksDBWindowStore#formatter*
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