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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10885) Support visibility expressions on Deletes
Date Mon, 16 Jun 2014 17:06:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14032639#comment-14032639
] 

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

I already saw that in my local machine and corrected the patch.  That was due to an assertion
that was added in the code.  I have corrected it but as I said we are working on some more
things.  Once it is finalised I will update the patch.  Any way after removing the assertion
the failed cases passes.

> 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: 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_v2.patch, HBASE-10885_v2.patch, HBASE-10885_v2.patch, HBASE-10885_v3.patch,
HBASE-10885_v4.patch, HBASE-10885_v5.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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