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From "Joel Knighton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13074) DynamicEndpointSnitch frequently no-ops through early exit in multi-datacenter situations
Date Thu, 22 Dec 2016 18:30:58 GMT
Joel Knighton created CASSANDRA-13074:
-----------------------------------------

             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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