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https://issues.apache.org/jira/browse/CASSANDRA-13074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15770939#comment-15770939
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T Jake Luciani commented on CASSANDRA-13074:
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Looks good and nice fine. Would it be possible to write a dtest to verify the
multi-dc use and avoid any future bugs?
> 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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