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https://issues.apache.org/jira/browse/HBASE-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191958#comment-13191958
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Lars Hofhansl edited comment on HBASE-5268 at 1/24/12 8:42 AM:
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@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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