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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7887) Support configuring KeyValue Comparator at table level
Date Thu, 21 Feb 2013 03:48:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582884#comment-13582884

Anoop Sam John commented on HBASE-7887:

[~zjushch] While creating the rowkey itself, the interger part in that can be changed so as
to make the sorting order correct. Lily project is having code for doing this.
> 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
> Now, KeyValue Comparator is static by code in HRegionInfo
> {code}
>   public KVComparator getComparator() {
>     return isRootRegion()? KeyValue.ROOT_COMPARATOR: isMetaRegion()?
>   }
> {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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