cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9471) Columns should be backed by a BTree, not an array
Date Mon, 03 Aug 2015 10:25:04 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651724#comment-14651724
] 

Benedict commented on CASSANDRA-9471:
-------------------------------------

I've rebased this and introduced unit tests to cover the majority of functionality. All of
which was already present but not covered.

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message