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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7887) Support configuring KeyValue Comparator at table level
Date Wed, 20 Feb 2013 17:11:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582335#comment-13582335
] 

stack commented on HBASE-7887:
------------------------------

bq. 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)

Tell  me more about this [~zjushch]  Where is the -1?

In the past we've just said this is not possible because all tables come together in the .META.
table and here, it would be untenable having a comparator per table; how would the sort of
the .META. table run?  (Switch in a new comparator whenever we cross into a new table section
in .META.?)

                
> 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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