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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2015/05/25 10:11:17 UTC

[jira] [Created] (CASSANDRA-9471) Columns should be backed by a BTree, not an array

Benedict created CASSANDRA-9471:
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             Summary: Columns should be backed by a BTree, not an array
                 Key: CASSANDRA-9471
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9471
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Benedict
            Assignee: Benedict
             Fix For: 3.0 beta 1


Follow up to 8099. 

We have pretty terrible lookup performance as the number of columns grows (linear). In at least one location, this results in quadratic performance. 

We don't however want this structure to be either any more expensive to build, nor to store. Some small modifications to BTree will permit it to serve here, by permitting efficient lookup by index, and calculation _of_ index for a given key.



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