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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-661) Allow to specify a user supplied row key comparator for a table
Date Thu, 16 Jul 2009 02:13:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12731771#action_12731771

stack commented on HBASE-661:

A comparator per table will not be happening anytime soon.  Can't have one comparator per
table.  When they all meet in the .META. if different comparators, it'll be hard to manage.

> Allow to specify a user supplied row key comparator for a table 
> ----------------------------------------------------------------
>                 Key: HBASE-661
>                 URL: https://issues.apache.org/jira/browse/HBASE-661
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: client, master, regionserver
>    Affects Versions: 0.2.0
>            Reporter: Clint Morgan
>            Assignee: Clint Morgan
> Now that row keys are byte arrays, users should be able to specify a comparator at table
creation time.
> My use case for this is to implement secondary indexes. In this case, row keys for the
index tables will be constructed from an optional prefix of the original row key as well as
the content of column that is being indexed. Then the comparator will first compare based
on the key prefix, and break ties by deserializing the column values and using the deserialized
type's compareTo method.

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