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https://issues.apache.org/jira/browse/CASSANDRA-17423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17507010#comment-17507010
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Caleb Rackliffe commented on CASSANDRA-17423:
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CC original CASSANDRA-16663 reviewers [~jmckenzie] [~benedict] in case you have
review cycles
> Add Native Transport Rate Limiter Options to Example cassandra.yaml and
> Expose Metric for Dispatch Rate
> -------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-17423
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17423
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Config, Observability/Metrics
> Reporter: Caleb Rackliffe
> Assignee: Caleb Rackliffe
> Priority: Normal
> Fix For: 4.1
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In CASSANDRA-16663, we added a new rate limiter that applies to all incoming
> requests over the native transport. Given it has now had some time to
> marinate in 4.1 snapshot builds, there are a few things we should do to make
> sure it hits the bar for usability and observability:
> 1.) Add the {{native_transport_rate_limiting_enabled}} and
> {{native_transport_max_requests_per_second}} options to the example
> {{cassandra.yaml}} file w/ brief documentation.
> 2.) Add a simple Meter/metric, probably in {{ClientMetrics}} for the rate* of
> native transport requests dispatched for processing. Given there are a few
> cases where native transport requests may not translate 1:1 to the number of
> times we hit StorageProxy, having this metric should make verifying the
> correct operation of the limiter easier. (Ex. IN queries w/ multiple
> partition keys, {{GROUP BY}} queries, etc.) It may make sense to look further
> into adjusting the behavior of the rate limiter to take these kinds of
> queries into account, but that is a bit more complex than either of these 2
> items, and deserves another Jira.
> \* We do expose a per-connection counter for the number of requests
> dispatched, and it is exposed over a virtual table and JMX, but even if it
> were global, it is not a rate metric.
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