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Date: Sun, 15 Jun 2014 06:25:02 +0000 (UTC)
From: "ramkrishna.s.vasudevan (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12705871.1396339199087.133861.1402813502096@arcas>
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References: <JIRA.12705871.1396339199087@arcas>
Subject: [jira] [Commented] (HBASE-10885) Support visibility expressions on
 Deletes
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    [ https://issues.apache.org/jira/browse/HBASE-10885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14031793#comment-14031793 ] 

ramkrishna.s.vasudevan commented on HBASE-10885:
------------------------------------------------

Not sure why this 
org.apache.hadoop.hbase.security.visibility.TestVisibilityLabelsWithDeletes
failed.  Seems to pass always. Not able to see the reports over there.  Let me resubmit once again to know if I uploaded a wrong patch.

> Support visibility expressions on Deletes
> -----------------------------------------
>
>                 Key: HBASE-10885
>                 URL: https://issues.apache.org/jira/browse/HBASE-10885
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.98.1
>            Reporter: Andrew Purtell
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Blocker
>             Fix For: 0.99.0, 0.98.4
>
>         Attachments: HBASE-10885_1.patch, HBASE-10885_2.patch, HBASE-10885_new_tag_type_1.patch, HBASE-10885_new_tag_type_2.patch, HBASE-10885_v1.patch, HBASE-10885_v2.patch, HBASE-10885_v2.patch, HBASE-10885_v2.patch, HBASE-10885_v3.patch, HBASE-10885_v4.patch
>
>
> Accumulo can specify visibility expressions for delete markers. During compaction the cells covered by the tombstone are determined in part by matching the visibility expression. This is useful for the use case of data set coalescing, where entries from multiple data sets carrying different labels are combined into one common large table. Later, a subset of entries can be conveniently removed using visibility expressions.
> Currently doing the same in HBase would only be possible with a custom coprocessor. Otherwise, a Delete will affect all cells covered by the tombstone regardless of any visibility expression scoping. This is correct behavior in that no data spill is possible, but certainly could be surprising, and is only meant to be transitional. We decided not to support visibility expressions on Deletes to control the complexity of the initial implementation.


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