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https://issues.apache.org/jira/browse/CASSANDRA-21400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18084105#comment-18084105
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Dmitry Konstantinov commented on CASSANDRA-21400:
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CI run for 6.0: https://pre-ci.cassandra.apache.org/job/cassandra-6.0/27/
Test failures are known issues not related to the change:
Tests / jvm-dtest jdk17 15/16 /
org.apache.cassandra.distributed.test.accord.InteropAccordCQLTest.testCASSimulatorLite-_jdk17_x86_64
Tests / jvm-dtest jdk17 1/16 /
org.apache.cassandra.fuzz.topology.HarryOnAccordTopologyMixupTest.test-_jdk17_x86_64
Tests / jvm-dtest jdk17 16/16 /
org.apache.cassandra.fuzz.topology.AccordTopologyMixupTest.test-_jdk17_x86_64
Tests / jvm-dtest jdk17 4/16 /
org.apache.cassandra.distributed.test.accord.AccordMigrationTest.testPaxosToAccordCAS-_jdk17_x86_64
Tests / jvm-dtest jdk17 4/16 /
org.apache.cassandra.distributed.test.accord.AccordMigrationTest.testPaxosToAccordSerialRead-_jdk17_x86_64
> Replace LongAdder in metric-like logic with ThreadLocalCounter
> --------------------------------------------------------------
>
> Key: CASSANDRA-21400
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21400
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Observability/Metrics
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Attachments: image-2026-05-23-16-36-52-381.png
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> There are several places where we use LongAdder for metric purposes, it is
> 0.9% CPU usage in total.
> We can replace it with ThreadLocalCounter to reduce overheads.
> Places:
> * org.apache.cassandra.io.sstable.keycache.KeyCache (hits and requests
> counters)
> * org.apache.cassandra.io.sstable.filter.BloomFilterTracker
> * org.apache.cassandra.utils.memory.BufferPool#memoryInUse
> * org.apache.cassandra.transport.ServerConnection#requests (used by
> Dispatcher on every request)
> !image-2026-05-23-16-36-52-381.png|width=600!
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