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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HBASE-883) Secondary Indexes
Date Wed, 19 Nov 2008 00:17:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648828#action_12648828
] 

apurtell edited comment on HBASE-883 at 11/18/08 4:16 PM:
----------------------------------------------------------------

Third time will be the charm. We took out the custom comparators because we can see them acting
as a tax on the rest of HRS: 5-10% CPU, 20% of all object allocation (on a jgray server).
But the custom comparators are used to reverse a test to provide descending sort orders. For
now we'll degrade the secondary index capability somewhat by fixing it up to work without
the custom comparators, hence no descending sort ordering. 

      was (Author: apurtell):
    Third time will be the charm. We took out the custom comparators because we can see them
acting as a tax on the rest of HRS: 5-10% CPU, 20% of all object allocation (on a jgray server).
But the custom comparators are used to reverse a test to provide descending sort orders. For
now we'll degrade the secondary index capability somewhat by fixing it up to work with the
custom comparators hence no descending sort ordering. 
  
> Secondary Indexes
> -----------------
>
>                 Key: HBASE-883
>                 URL: https://issues.apache.org/jira/browse/HBASE-883
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: client, regionserver
>            Reporter: Clint Morgan
>            Assignee: Andrew Purtell
>             Fix For: 0.19.0
>
>         Attachments: hbase-883.patch, hbase-883.patch, hbase-883.patch, hbase-883.patch,
hbase-883.patch, hbase-883.patch, hbase-883.patch, secondary.patch
>
>
> I'm working on a secondary index impl. The basic idea is to maintain a separate table
per index.

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