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https://issues.apache.org/jira/browse/CASSANDRA-19033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17786927#comment-17786927
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Paulo Motta commented on CASSANDRA-19033:
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Seems like it could be useful to expose formatted gc info via a vtable for
troubleshooting/tuning. If GC logging is not enabled I think it's fine to error
out or perhaps not even load the virtual table.
Would a specific GC logging format be required? Would this support just
gc.log.current or compressed rolled over files?
Do you have an idea on what the table schema would look like and possible
queries?
> Add virtual table 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
> Priority: Normal
>
> 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.
> At a minimum, pause time should be it's own field so we can query for pauses
> over a specific threshold, but there may be other data we want to explicitly
> split out as well.
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