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From "Lars Hofhansl (Issue Comment Edited) (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (HBASE-5268) Add delete column prefix delete marker
Date Tue, 24 Jan 2012 08:42:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191958#comment-13191958
] 

Lars Hofhansl edited comment on HBASE-5268 at 1/24/12 8:42 AM:
---------------------------------------------------------------

@Stack... Here's an example.
Say you can columns X100, X101, X102, ..., X199, and X200, X201, X202, ..., X299, X300, ...,
in a row R, all in the same column family.
(I'd have this if I modeled rows inside HBase rows by using a prefix to identify the inner
rows.)

Now I want to be able to delete all columns that start with X1. Without a prefix delete marker
I'd have to place 100 column delete markers. With a prefix marker I can just place one marker
for the X1 prefix.
If the prefix is empty, this would degenerate into the same behavior as a family marker (albeit
less efficient).

                
      was (Author: lhofhansl):
    @Stack... Here's an example.
Say you can columns X100, X101, X102, ..., X199, and X200, X201, X202, ..., X299, X300, ...,
in a row R, all in the same column family.
(I'd have this if I modeled rows inside HBase by using a prefix to identify the inner rows.)

Now I want to be able to delete all columns that start with X1. Without a prefix delete marker
I'd have to place 100 column delete markers. With a prefix marker I can just place one marker
for the X1 prefix.
If the prefix is empty, this would degenerate into the same behavior as a family marker (albeit
less efficient).

                  
> Add delete column prefix delete marker
> --------------------------------------
>
>                 Key: HBASE-5268
>                 URL: https://issues.apache.org/jira/browse/HBASE-5268
>             Project: HBase
>          Issue Type: Improvement
>          Components: client, regionserver
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0
>
>         Attachments: 5268.txt
>
>
> This is another part missing in the "wide row challenge".
> Currently entire families of a row can be deleted or individual columns or versions.
> There is no facility to mark multiple columns for deletion by column prefix.
> Turns out that be achieve with very little code (it's possible that I missed some of
the new delete bloom filter code, so please review this thoroughly). I'll attach a patch soon,
just working on some tests now.

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