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https://issues.apache.org/jira/browse/CASSANDRA-21020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18082453#comment-18082453
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Dmitry Konstantinov edited comment on CASSANDRA-21020 at 5/20/26 11:05 PM:
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the remaining tricky part: dtests and isolated classloaders, they seem unhappy
about the current logic..
was (Author: dnk):
the remaining tricky part: dtests and isolated classloaders, they seems unhappy
about the current logic..
> Optimize thread local for metrics and tracing
> ---------------------------------------------
>
> Key: CASSANDRA-21020
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21020
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Observability/Metrics, Observability/Tracing
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently Netty thread local logic is used in tracing to keep state and in
> metrics (thread local counters logic introduced in CASSANDRA-20250), so we do
> the thread local lookups many times during a request processing. These cases
> can be optimized by placing these objects as field variables to Thread itself
> by introducing CassandraThread as a child of FastThreadLocalThread.
> Similar idea can be found even in JDK (ThreadLocalRandom logic was introduced
> for ForkJoinPool speedup)
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