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From "Anthony Grasso (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9988) Introduce leaf-only iterator
Date Thu, 20 Jul 2017 01:40:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16094069#comment-16094069
] 

Anthony Grasso commented on CASSANDRA-9988:
-------------------------------------------

[~benedict], that is a very good point about falling out of the CPU cache. As you suggest,
we should modify the generation of the objects such that they include at the very least a
UUID sequence and possibly a string sequence. In addition, we should add a fourth B-Tree test;
{{btreeExtraLarge}} which has 100k elements in it.

Before committing, it would be good to make the above changes and then rerun the JMH benchmarks
again. [~jay.zhuang] if you are busy, I am happy to make the changes and re-run the benchmarks.

> Introduce leaf-only iterator
> ----------------------------
>
>                 Key: CASSANDRA-9988
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9988
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Benedict
>            Assignee: Jay Zhuang
>            Priority: Minor
>              Labels: patch
>             Fix For: 4.0
>
>         Attachments: 9988-trunk-new.txt, 9988-trunk-new-update.txt, trunk-9988.txt
>
>
> In many cases we have small btrees, small enough to fit in a single leaf page. In this
case it _may_ be more efficient to specialise our iterator.



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