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https://issues.apache.org/jira/browse/CASSANDRA-14862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16673542#comment-16673542
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Joseph Lynch commented on CASSANDRA-14862:
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>From Benedict on IRC:
{noformat}
> I might change the language slightly, as I don't think it's 100% clear they
> should be returned in the sequence they occur following the search token
> (like, 95% clear but you need to think about it), but the important point
> (that it's depended on) is plenty clear.
> I'd probably personally have written something like "Calculate the natural
> endpoints for the given token. They are returned in the order they occur in
> the ring following the search token, as defined by the replication strategy",
> but I don't think it's terribly important{noformat}
Based on this feedback I have pushed an amended commit to
([cafd44c8|https://github.com/jolynch/cassandra/commit/cafd44c8d9ae24c953a8d82746fc89bfe2465641].
> TestTopology.test_size_estimates_multidc fails on trunk
> -------------------------------------------------------
>
> Key: CASSANDRA-14862
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14862
> Project: Cassandra
> Issue Type: Bug
> Components: Testing
> Reporter: Joseph Lynch
> Assignee: Joseph Lynch
> Priority: Minor
> Labels: 4.0-QA
> Fix For: 4.0
>
>
> The sorting of natural replicas in
> {{SimpleStrategy.calculateNaturalReplicas}} committed as part of
> [e645b917|https://github.com/apache/cassandra/commit/e645b9172c5d50fc2af407de724e46121edfe109#diff-0e1563a70b49cd81e9e11b4ddad15cf2L68]
> for CASSANDRA-14726 has broken the
> {{TestTopology.test_size_estimates_multidc}} dtest ([example
> run|https://circleci.com/gh/jolynch/cassandra/245#tests/containers/48]) as
> the "primary" ranges have now changed. I'm actually surprised only a single
> dtest fails as I believe we've broken multi-dc {{SimpleStrategy}} reasonably
> badly.
> In particular the {{SimpleStrategy.calculateNaturalReplicas}} method cannot
> sort the endpoints by datacenter first. It has to leave them in the order
> that it found them else change which replicas are considered "primary"
> replicas (which mostly impacts repair and size estimates and the such).
> I have written a regression unit test for the SimpleStrategy and am running
> it through circleci now. Will post the patch shortly.
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