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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10885) Support visibility expressions on Deletes
Date Tue, 01 Apr 2014 08:00:30 GMT
Andrew Purtell created HBASE-10885:

             Summary: 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 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.

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