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Stefan Podkowinski commented on CASSANDRA-13603:
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I agree that it's easy to misuse MerkleTree.differenceHelper(). It should only
really be called from MerkleTree.difference() and should have a
{{@VisibleForTesting}} annotation to indicate that it's internal use only. As
for the suggested changes around midpoint result handling, I'm not really
convinced that we should use this value to check if we should stop tree
traversal. Although we should be at a leaf nodes already when getting an
invalid midpoint value, we wouldn't be able to tell otherwise without any kind
of error message, blindly following this assumption. This may cover other
potential errors.
We already check {{node instanceof Leaf}} before recursively calling
differenceHelper() with a sub-range. I'd suggest to do the same in
difference(). It just doesn't make sense to call differenceHelper() with two
leaf nodes, doesn't it?
> Change repair midpoint logging from CASSANDRA-13052
> ----------------------------------------------------
>
> Key: CASSANDRA-13603
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13603
> Project: Cassandra
> Issue Type: Bug
> Components: Streaming and Messaging
> Reporter: Jeff Jirsa
> Assignee: Jeff Jirsa
> Priority: Trivial
> Fix For: 3.0.x, 3.11.x, 4.x
>
>
> In CASSANDRA-13052 , we changed the way we handle repairs on small ranges to
> make them more sane in general, but {{MerkleTree.differenceHelper}} now
> erroneously logs at error.
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