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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/09/23 20:07:04 UTC

[jira] [Commented] (CASSANDRA-4338) Experiment with direct buffer in SequentialWriter

    [ https://issues.apache.org/jira/browse/CASSANDRA-4338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13774798#comment-13774798 ] 

Jonathan Ellis commented on CASSANDRA-4338:
-------------------------------------------

Also relevant, Radim said he got a large improvement from mmap-based writes in CASSANDRA-5473.
                
> Experiment with direct buffer in SequentialWriter
> -------------------------------------------------
>
>                 Key: CASSANDRA-4338
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4338
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Marcus Eriksson
>            Priority: Minor
>              Labels: performance
>             Fix For: 2.1
>
>         Attachments: 4338-gc.tar.gz, gc-4338-patched.png, gc-trunk.png
>
>
> Using a direct buffer instead of a heap-based byte[] should let us avoid a copy into native memory when we flush the buffer.

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