Michael Semb Wever created CASSANDRA-20923:
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Summary: Segregate SAI's query metrics per query type
Key: CASSANDRA-20923
URL: https://issues.apache.org/jira/browse/CASSANDRA-20923
Project: Apache Cassandra
Issue Type: Improvement
Components: Feature/SAI
Reporter: Michael Semb Wever
SAI's tracks query metrics providing info about latency, partition reads,
filtered rows, etc. These metrics are for all the SAI queries for a certain
table. When we see problems in queries, for example a high latency, questions
that can usually come next are what query is producing this high latency? Are
there vector queries? Are queries for a single partition? In that case, what is
the latency of those queries? How many rows are they selecting? To answer those
questions, I think it can be useful to track metrics for specific types of
query.
Tracking is done in a {{TableQueryMetrics}} associated to the table.
This PR only adds a few type of queries: filtering, top-k, single-partition and
range queries. If we need new types in the future, this patch should make it
easy to add separate metrics for them, possibly with an one-liner.
The general query metrics remain untouched, this PR only adds new ones.
More background info from downstream work in
https://github.com/datastax/cassandra/pull/1969 and
https://github.com/datastax/cassandra/pull/2015
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