[
https://issues.apache.org/jira/browse/CASSANDRA-13074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15795527#comment-15795527
]
Joel Knighton commented on CASSANDRA-13074:
-------------------------------------------
[~tjake] - A dtest is a great idea. I've PRed a test to
[riptano/cassandra-dtest|https://github.com/riptano/cassandra-dtest/pull/1416].
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
