Elliott Sims created CASSANDRA-21571:
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Summary: Guardrail to limit LWT per-partition concurrency
Key: CASSANDRA-21571
URL: https://issues.apache.org/jira/browse/CASSANDRA-21571
Project: Apache Cassandra
Issue Type: Improvement
Reporter: Elliott Sims
I'm actually not sure if this should be a Guardrail exactly, or something else,
but:
Cassandra's threading model combined with LWT behavior means that it's very
easy for contention on a single partition to tie up all of the threads on the
hosts that own that partition, which causes cascading failures across the
cluster and any clients. It's possible to set up rate-limits at the
application level, but that can be challenging in a distributed system.
Especially one that involves multiple applications or products.
So, it would be very nice to have some way to say "only allow N (or X% of a
pool?) threads to contend LWTs on a partition, and reject any further queries"
to limit the blast radius to only that partition.
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