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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9045) Support Dictionary based Tag compression in HFiles
Date Wed, 30 Oct 2013 19:05:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13809492#comment-13809492
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Anoop Sam John commented on HBASE-9045:
---------------------------------------

bq.Can do it based on configuration?
IMO deciding such a conf is hard. Tags might be internally used for different use cases later.
(Already there are some plans in other jiras) For a user to know all these and deciding such
a conf will be hard right?  That is why I am thinking that tag by tag compression will be
safe. What do you say?

Will correct the javadoc. I missed that in this patch. Thanks for the finding.
bq.if (in.hasArray()) 
That is the recommendation from javadoc for using array() 
{quote}
Invoke the hasArray method before invoking this
method in order to ensure that this buffer has an accessible backing
array.  
{quote}

> Support Dictionary based Tag compression in HFiles
> --------------------------------------------------
>
>                 Key: HBASE-9045
>                 URL: https://issues.apache.org/jira/browse/HBASE-9045
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 0.98.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 0.98.0
>
>         Attachments: HBASE-9045.patch, HBASE-9045_V2.patch
>
>
> Along with the DataBlockEncoding algorithms, Dictionary based Tag compression can be
done



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