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https://issues.apache.org/jira/browse/CASSANDRA-21571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rishabh Saraswat reassigned CASSANDRA-21571:
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Assignee: Rishabh Saraswat
> 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
> Assignee: Rishabh Saraswat
> Priority: Normal
>
> 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.
> Even a per-host limit on concurrent LWTs would help a fair amount even if it
> wouldn't completely isolate the problem partition.
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