[jira] [Updated] (KAFKA-14414) Remove unnecessary usage of ObjectSerializationCache

["Divij Vaidya (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-14414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Divij Vaidya updated KAFKA-14414:
---------------------------------
    Attachment: producer-only-cpu-33-clean.html

> 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
>            Assignee: Divij Vaidya
>            Priority: Major
>             Fix For: 3.4.0
>
>         Attachments: Screenshot 2022-11-21 at 19.23.53.png, producer-only-cpu-33-clean.html
>
>
> 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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