Jon Haddad created CASSANDRA-19033:
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Summary: Add virtual tables with GC pause history
Key: CASSANDRA-19033
URL: https://issues.apache.org/jira/browse/CASSANDRA-19033
Project: Cassandra
Issue Type: New Feature
Components: Feature/Virtual Tables
Reporter: Jon Haddad
We should be able to view GC pause history in a virtual table.
I think the best approach here is to read from the GC logs. The format was
unified in Java 9, and we've dropped older JVM support so I think this is
reasonable. The benefits of using logs are that we can preserve it across
restarts and we enable GC logs by default.
The downside is people might not have GC logs configured and it seems weird
that a feature would just stop working because logs aren't enabled. Maybe
that's OK if we call it out, or error if people try to read from it and the
logs aren't enabled. I think if someone disables -Xlog:gc then an error might
be fine as I don't expect it to happen often. I think I lean towards this from
a usability perspective, and Microsoft has a
[project|https://github.com/microsoft/gctoolkit] to parse them, but I haven't
used it so I'm not sure if it's suitable for us.
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