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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2015/05/25 10:24:17 UTC
[jira] [Created] (CASSANDRA-9473) Introduce BTreeSet with support
for in-place reversal
Benedict created CASSANDRA-9473:
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Summary: Introduce BTreeSet with support for in-place reversal
Key: CASSANDRA-9473
URL: https://issues.apache.org/jira/browse/CASSANDRA-9473
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Benedict
Assignee: Benedict
Priority: Minor
Fix For: 3.x
Follow up to CASSANDRA-8099.
We use TreeSet in a lot of places unnecessarily. This is especially a concern now that we store the set of rows we're searching for in both forward and (potentially) reverse order, which we have to construct twice. A very simple wrapper around BTree (which we had previously, but did not employ) would permit us to reverse this collection without any extra work, can be built more cheaply, consumes less memory, and supports the SearchIterator interface, so can be iterated more efficiently.
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