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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10885) Support visibility expressions on Deletes
Date Wed, 02 Jul 2014 05:04:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049628#comment-14049628
] 

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

Sure.  Its in the final stages of review.  We got lot of new scenarios while reviewing and
also while fixing one we got new types of combinations.
Some small minor logical changes were suggested by Anoop on the final review.  Just discussing
them if the changes (if we make it or not) are fine then we can commit it later today EOD
my time.  Also Anoop is on travel now so once he finalises the patch we can be ready for commit.

> 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, 1.0.0, 0.98.4
>
>         Attachments: 10885-org.apache.hadoop.hbase.security.visibility.TestVisibilityLabelsWithDeletes-output.txt,
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_v12.patch, HBASE-10885_v12.patch, HBASE-10885_v13.patch,
HBASE-10885_v15.patch, HBASE-10885_v2.patch, HBASE-10885_v2.patch, HBASE-10885_v2.patch, HBASE-10885_v3.patch,
HBASE-10885_v4.patch, HBASE-10885_v5.patch, HBASE-10885_v7.patch, HBASE-10885_v8.patch, HBASE-10885_v9.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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