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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11870) Optimization : Avoid copy of key and value for tags addition in AC and VC
Date Thu, 23 Oct 2014 18:13:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14181689#comment-14181689
] 

Andrew Purtell commented on HBASE-11870:
----------------------------------------

lgtm

> Optimization : Avoid copy of key and value for tags addition in AC and VC
> -------------------------------------------------------------------------
>
>                 Key: HBASE-11870
>                 URL: https://issues.apache.org/jira/browse/HBASE-11870
>             Project: HBase
>          Issue Type: Improvement
>          Components: Performance, security
>    Affects Versions: 0.98.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>         Attachments: HBASE-11870.patch
>
>
> In AC and VC we have to add the per cell ACL tags/ visibility tags to Cells. We get KeyValue
objects and which need one backing array with key,value and tags. So in order to add a tag
we have to recreate buffer the and copy the entire key , value and tags.  We can avoid this
> Create a new Cell impl which wraps the original Cell and fro the non tag parts just refer
this old buffer.
> This will contain a byte[] state for the tags part.
> Also we have to ensure we deal with Cells n write path not KV.



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