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https://issues.apache.org/jira/browse/CASSANDRA-18669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17743756#comment-17743756
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Andres de la Peña commented on CASSANDRA-18669:
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Committed to {{cep-7-sai}} as
[83419e074d131a68112470fc8761c3edafb5e675|https://github.com/apache/cassandra/commit/83419e074d131a68112470fc8761c3edafb5e675]
with that last nit.
> Concurrency is broken in the block balanced tree for queries
> ------------------------------------------------------------
>
> Key: CASSANDRA-18669
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18669
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/SAI
> Reporter: Mike Adamson
> Assignee: Mike Adamson
> Priority: Normal
>
> Performance testing has highlighted that concurrent queries are broken
> against the block balanced tree because the mutable traversal state was
> pushed up to the walker that is linked to an SSTableIndex so is shared
> amongst all queries.
> A new traversal state should be created for each query and marked as not
> threadsafe. We should add a test to show that concurrent queries work against
> the block balanced tree.
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