[jira] Commented: (CASSANDRA-1651) Improve read performance by using byte array slabs

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-1651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924028#action_12924028 ] 

Ryan King commented on CASSANDRA-1651:
--------------------------------------

If we're going to expose the tunable for the size of the slab, we should also measure its effectiveness. Otherwise you'd often be tuning in the dark.

> 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
>            Priority: Minor
>         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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