Joseph Lynch created CASSANDRA-14862:
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Summary: 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
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 {{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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