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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7887) Support configuring KeyValue Comparator at table level
Date Thu, 21 Feb 2013 03:14:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582859#comment-13582859
] 

chunhui shen commented on HBASE-7887:
-------------------------------------

bq.Where is the -1?
The integer -1 's binary code is 11111111 11111111 11111111 11111111, so it is biggest if
using byte comparator.

bq.this is not possible because all tables come together in the .META. table and here
Thanks, I'm clear now.

Close this issue since not possible.


                
> Support configuring KeyValue Comparator at table level
> ------------------------------------------------------
>
>                 Key: HBASE-7887
>                 URL: https://issues.apache.org/jira/browse/HBASE-7887
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>    Affects Versions: 0.96.0
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>             Fix For: 0.96.0
>
>
> Now, KeyValue Comparator is static by code in HRegionInfo
> {code}
>   public KVComparator getComparator() {
>     return isRootRegion()? KeyValue.ROOT_COMPARATOR: isMetaRegion()?
>       KeyValue.META_COMPARATOR: KeyValue.COMPARATOR;
>   }
> {code}
> In some user cases, we need a personalized KeyValue Comparator.
> e.g. Current ByteArrayComparator couldn't be used to sort number if exists negative number.(Because
the bytes of -1 is bigger than the bytes of any other number)
> I think supporting per-table configuration of KeyValue Comparator would be useful.
> Welcome comments,
> I will make the patch tomorrow.

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