[jira] [Updated] (KAFKA-16055) Thread unsafe use of HashMap stored in QueryableStoreProvider#storeProviders

["Matthias J. Sax (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-16055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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