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