Yuqi Yan created CASSANDRA-20980:
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Summary: GCInspector should use different thresholds on GC events
for warning messages
Key: CASSANDRA-20980
URL: https://issues.apache.org/jira/browse/CASSANDRA-20980
Project: Apache Cassandra
Issue Type: Improvement
Reporter: Yuqi Yan
Assignee: Yuqi Yan
Running Cassandra 4.1 and recently testing with ShenandoahGC.
Noticed that the log message is flooded with the warning message coming from
GCInspector.
Taking a closer look, that seems that we're warning on every GC event that
takes longer than 1 second (default). And from document that the intention was
to monitor GC pause time.
But for ShenandoahGC and ZGC, there are concurrent phases (no STW) and phases
that actually STW.
For those concurrent phases, it's expected to take longer time (if we're on the
non-generational version), and I feel that these phases:
1. require STW
2. doesn't require STW
should use different thresholds in warning message.
At least to me, phases require STW actually pause the thread, and should use
lower threshold compared to those concurrent phases.
Will share a patch soon
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