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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2014/02/12 21:54:20 UTC

[jira] [Commented] (CASSANDRA-6697) Refactor Cell and CellName ByteBuffer accessors to avoid garbage allocation where possible

    [ https://issues.apache.org/jira/browse/CASSANDRA-6697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899559#comment-13899559 ] 

Benedict commented on CASSANDRA-6697:
-------------------------------------

I've uploaded a preliminary patch [here|https://github.com/belliottsmith/cassandra/tree/iss-6697] that makes the change for Composite / CellName only.

It would be useful to get some feedback before I take the change to completion.

> Refactor Cell and CellName ByteBuffer accessors to avoid garbage allocation where possible
> ------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6697
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6697
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>             Fix For: 2.1
>
>
> This is a prerequisite for CASSANDRA-6692.
> The basic idea is to, if unsafe is available, abuse it to modify preallocated ByteBuffers so that when they are short lived they do not need to be instantiated. Initially this will only be helpful for comparisons and lookups on the BBs, but with some modifications to the read path we should be able to reduce the need in CASSANDRA-6692 to construct BBs to pass to the native protocol (thrift may have to continue as is)



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