Joel Knighton created CASSANDRA-13074:
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Summary: DynamicEndpointSnitch frequently no-ops through early
exit in multi-datacenter situations
Key: CASSANDRA-13074
URL: https://issues.apache.org/jira/browse/CASSANDRA-13074
Project: Cassandra
Issue Type: Bug
Components: Coordination
Reporter: Joel Knighton
Assignee: Joel Knighton
Fix For: 2.2.x, 3.0.x, 3.x, 4.x
The DynamicEndpointSnitch attempts to use timings from nodes to route reads to
better performing nodes.
In a multi-datacenter situation, timings will likely be empty for nodes outside
of the local datacenter, as you'll frequently only be doing local_quorum reads
(or a lower consistency level). In this case, the DES exits early and returns
the subsnitch ordering. This means poorly performing replicas will never be
avoided, no matter how degraded they are.
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