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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5625) Avoid byte buffer allocations when reading a value from a Result object
Date Thu, 29 Mar 2012 18:00:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241443#comment-13241443
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Zhihong Yu commented on HBASE-5625:
-----------------------------------

I have put some comments here: https://reviews.apache.org/r/4559/

@Tudor:
Feel free to create your own review request for the new patch.
                
> Avoid byte buffer allocations when reading a value from a Result object
> -----------------------------------------------------------------------
>
>                 Key: HBASE-5625
>                 URL: https://issues.apache.org/jira/browse/HBASE-5625
>             Project: HBase
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 0.92.1
>            Reporter: Tudor Scurtu
>            Assignee: Tudor Scurtu
>              Labels: patch
>         Attachments: 5625.txt, 5625v2.txt, 5625v3.txt, 5625v4.txt
>
>
> When calling Result.getValue(), an extra dummy KeyValue and its associated underlying
byte array are allocated, as well as a persistent buffer that will contain the returned value.
> These can be avoided by reusing a static array for the dummy object and by passing a
ByteBuffer object as a value destination buffer to the read method.
> The current functionality is maintained, and we have added a separate method call stack
that employs the described changes. I will provide more details with the patch.
> Running tests with a profiler, the reduction of read time seems to be of up to 40%.

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