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https://issues.apache.org/jira/browse/KAFKA-12804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ki Lok Wong reassigned KAFKA-12804:
-----------------------------------
Assignee: Ki Lok Wong
> In-Memory state store backed by InMemoryKeyValueStore is slow due to
> synchronizing reads/writes using a single lock.
> --------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-12804
> URL: https://issues.apache.org/jira/browse/KAFKA-12804
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 2.6.2
> Reporter: Ki Lok Wong
> Assignee: Ki Lok Wong
> Priority: Minor
> Labels: performance, pull-request-available
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> Default In-Memory state store (InMemoryKeyValueStore) uses TreeMap as the
> backing map implementation. Read/write methods such as get() and put() are
> synchronized on the same lock hence significantly reducing multi-thread
> performance.
> https://github.com/a0x8o/kafka/blob/f834be5e73e46805b29df9845bf09be98f91fc09/streams/src/main/java/org/apache/kafka/streams/state/internals/InMemoryKeyValueStore.java#L78
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