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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-9473) Introduce BTreeSet with support for in-place reversal
Date Sat, 18 Jul 2015 15:51:04 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-9473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aleksey Yeschenko updated CASSANDRA-9473:
-----------------------------------------
    Fix Version/s:     (was: 3.x)

> 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: Paulo Motta
>            Priority: Minor
>
> 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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