Dmitry Konstantinov created CASSANDRA-21020:
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Summary: 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
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 into 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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