[jira] [Commented] (CASSANDRA-9932) Make all partitions btree backed

["Benedict (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-9932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14653186#comment-14653186 ] 

Benedict commented on CASSANDRA-9932:
-------------------------------------

Patch available [here|https://github.com/belliottsmith/cassandra/tree/9932]

> Make all partitions btree backed
> --------------------------------
>
>                 Key: CASSANDRA-9932
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9932
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>             Fix For: 3.0.0 rc1
>
>
> Following on from the other btree related refactors, this patch makes all partition (and partition-like) objects backed by the same basic structure: {{AbstractBTreePartition}}. With two main offshoots: {{ImmutableBTreePartition}} and {{AtomicBTreePartition}}
> The main upshot is a 30% net code reduction, meaning better exercise of btree code paths and fewer new code paths to go wrong. A secondary upshort is that, by funnelling all our comparisons through a btree, there is a higher likelihood of icache occupancy and we have only one area to focus delivery of improvements for their enjoyment by all.



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