Divij Vaidya created KAFKA-14414:
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Summary: Remove unnecessary usage of ObjectSerializationCache
Key: KAFKA-14414
URL: https://issues.apache.org/jira/browse/KAFKA-14414
Project: Kafka
Issue Type: Improvement
Components: core
Reporter: Divij Vaidya
Fix For: 3.4.0
Attachments: Screenshot 2022-11-21 at 19.23.53.png
We create an instance of ObjectSerializationCache at
[https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/network/RequestChannel.scala#L113]
which does not get used at all. We always "add" to the cache but never
retrieve from it (as is evident by the fact that we don't store the reference
of the cache anywhere).
Adding information to the cache is expensive because it uses
System.identityHashCode(Object) which is expensive as demonstrated by the flame
graph of producer requests over Apache Kafka 3.3.1 plaintext broker.
{{!Screenshot 2022-11-21 at 19.23.53.png!}}
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