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https://issues.apache.org/jira/browse/KAFKA-6066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16214165#comment-16214165
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Guozhang Wang commented on KAFKA-6066:
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We have removed usage on DateFormat in this commit
https://github.com/apache/kafka/commit/ed0e692147d81e396bf10f4d9425516d51bd52cc
And now it only gets used when encountering an old formatted segment file name
to convert to the new format. This is for backward compatibility.
> 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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