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https://issues.apache.org/jira/browse/CASSANDRA-21400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21400:
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Test and Documentation Plan: covered by existing tests
Status: Patch Available (was: In Progress)
> 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
> Attachments: image-2026-05-23-16-36-52-381.png
>
> Time Spent: 10m
> 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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