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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10885) Support visibility expressions on Deletes
Date Tue, 01 Apr 2014 10:36:18 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell updated HBASE-10885:
-----------------------------------

    Description: 
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.

  was:
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 if they are visible to
the user issuing the delete or not. 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.


> 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
>             Fix For: 0.99.0, 0.98.2
>
>
> 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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