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From "Jay Zhuang (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9988) Introduce leaf-only iterator
Date Tue, 25 Jul 2017 00:07:00 GMT


Jay Zhuang commented on CASSANDRA-9988:

hi [~benedict] I also added tests for different cellSize: 36, 100, 1k and 10K (they're generated
from random UUID.tostring()). In the graph above, they're corresponding to 4 data points in
each bTree size section. We don't see a significant difference between them. For example {{IteratorTree}},
the first 4 data points are the ones for one-node-BTree with different cellSize, they have
the similar improvements (+800%), maybe here is better graph:

> Introduce leaf-only iterator
> ----------------------------
>                 Key: CASSANDRA-9988
>                 URL:
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Benedict
>            Assignee: Jay Zhuang
>            Priority: Minor
>              Labels: patch
>             Fix For: 4.0
>         Attachments: 9988-data.png, 9988-result2.png, 9988-result.png, 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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