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https://issues.apache.org/jira/browse/KAFKA-13629?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Chen resolved KAFKA-13629.
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Fix Version/s: 3.2.0
Reviewer: Ismael Juma
Resolution: Fixed
> Client producer use faster ByteUtils sizeOfXxx algorithm
> --------------------------------------------------------
>
> Key: KAFKA-13629
> URL: https://issues.apache.org/jira/browse/KAFKA-13629
> Project: Kafka
> Issue Type: Improvement
> Components: clients, producer
> Reporter: Jason Koch
> Priority: Minor
> Fix For: 3.2.0
>
>
> Kafka Java client producer path uses `tryAppend()` requires an estimated
> size. The sizeOf algorithm currently uses an [iterative while
> loop|https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/utils/ByteUtils.java#L394-L401]
> which can be improved.
> On real system this reduces the producer path CPU by 4%. JMH benchmarking
> shows the algorithm is approx 3x faster (90 op/ms -> 290op/ms).
> Specifically, we can use a prepared table with the following lookup which
> relies on JVM intrinsic for fast performance, and also avoids any branching:.
> --
> {{int leadingZeros = Integer.numberOfLeadingZeros(value);}}
> {{return LEADING_ZEROS_TO_U_VARINT_SIZE[leadingZeros];}}
> --
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