[jira] [Created] (KAFKA-12804) In-Memory state store backed by InMemoryKeyValueStore is slow due to synchronizing reads/writes using a single lock.

Mon, 17 May 2021 19:42:06 -0700 

Ki Lok Wong created KAFKA-12804:
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             Summary: 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


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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