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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1651) Improve read performance by using byte array slabs
Date Thu, 28 Oct 2010 15:08:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925824#action_12925824
] 

Jonathan Ellis commented on CASSANDRA-1651:
-------------------------------------------

Before committing this I want to

 1. evaluate the Lucene allocator
 2. find where the point of diminishing returns is (I suspect fairly low) and set slab size
to that rather than exposing a tunable

> Improve read performance by using byte array slabs
> --------------------------------------------------
>
>                 Key: CASSANDRA-1651
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1651
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: T Jake Luciani
>            Assignee: T Jake Luciani
>            Priority: Minor
>             Fix For: 0.7.0
>
>         Attachments: 1651_v1.txt
>
>
> Now that the code has switched to byte buffers internally,  it should be possible to
improve read performance by reducing the number of byte array allocations.
> This patch accomplishes this by and re-using sections of a larger byte array slab.
> I've benchmarked it locally and seen a slight improvement on reads, a larger scale benchmark
should be performed.
> Also the size of a slab can be configured in cassandra.yaml

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