Caleb Rackliffe created CASSANDRA-17423:
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Summary: 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
Reporter: Caleb Rackliffe
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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