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Andrew Purtell commented on HBASE-10885: ---------------------------------------- bq. Also it wont one simple bytes compare. A&B will be stored as one Tag. In case of '|' it will be stored as 2 tags. So we need to consider all these tags and compare all. Just a note before starting the impl. Ok thanks Anoop. > 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 > 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. -- This message was sent by Atlassian JIRA (v6.2#6252)