Reilly Brogan created CASSANDRA-17751:
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Summary: Better Behavior for GCInspector with Low Pause Time GCs
Key: CASSANDRA-17751
URL: https://issues.apache.org/jira/browse/CASSANDRA-17751
Project: Cassandra
Issue Type: Improvement
Reporter: Reilly Brogan
Low pause time GCs like Shenandoah tend to be very spammy when it comes to
running Cassandra with the default configuration. This is because GCInspector
seems to detect that Shenandoah cycles are equivalent to GC pauses and because
these cycles tend to be relatively long (in the order of 2-3 seconds in my
experience) GCInspector constantly throws warnings. However, these cycle times
are normal and are not an indicator of resource contention or heap pressure as
the actual pause times are very short.
It would be great if Cassandra could be modified such that GCInspector had
different behavior if a low pause time collector was detected as being in use
(such as perhaps disabling the warning altogether).
Note that I used Shenandoah here for my example but ZGC is presumed to have
similar behavior.
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