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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9473) Introduce BTreeSet with support for in-place reversal
Date Mon, 25 May 2015 08:24:17 GMT
Benedict created CASSANDRA-9473:
-----------------------------------

             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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