Dmitry Konstantinov created CASSANDRA-21400:
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Summary: 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
Reporter: Dmitry Konstantinov
Assignee: Dmitry Konstantinov
Attachments: image-2026-05-23-16-36-52-381.png
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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