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https://issues.apache.org/jira/browse/KAFKA-16055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax updated KAFKA-16055:
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Component/s: streams
> Thread unsafe use of HashMap stored in QueryableStoreProvider#storeProviders
> ----------------------------------------------------------------------------
>
> Key: KAFKA-16055
> URL: https://issues.apache.org/jira/browse/KAFKA-16055
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 3.6.1
> Reporter: Kohei Nozaki
> Priority: Minor
>
> This was originally raised in [a kafka-users
> post|https://lists.apache.org/thread/gpct1275bfqovlckptn3lvf683qpoxol].
> There is a HashMap stored in QueryableStoreProvider#storeProviders ([code
> link|https://github.com/apache/kafka/blob/3.6.1/streams/src/main/java/org/apache/kafka/streams/state/internals/QueryableStoreProvider.java#L39])
> which can be mutated by a KafkaStreams#removeStreamThread() call. This can
> be problematic when KafkaStreams#store is called from a separate thread.
> We need to somehow make this part of code thread-safe by replacing it by
> ConcurrentHashMap or/and using an existing locking mechanism.
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