Thomas D'Silva commented on HBASE-19842:


I can work on this JIRA if no one else is currently working on it. 

> Cell ACLs v2
> ------------
>                 Key: HBASE-19842
>                 URL: https://issues.apache.org/jira/browse/HBASE-19842
>             Project: HBase
>          Issue Type: New Feature
>          Components: security
>            Reporter: Andrew Purtell
>            Priority: Major
> Per cell ACLs as currently implemented (HBASE-7662) embed the serialized ACL 
> in a tag stored with each cell. This was done for performance. This has some 
> drawbacks, most significantly unnecessary duplication and to grant or revoke 
> this requires a rewrite of every affected cell. We could implement them in a 
> space efficient (and management efficient way) at the cost of some 
> performance like so:
> First, allow storage of cell level ACLs in the ACL table. Rowkey could be 
> hash of serialized ACL format. Just have to avoid using rowkeys that 
> associate the ACL with a cf, or table, or namespace... And handle entries in 
> the ACL tables which don't conform to today's keying strategy. 
> Then provide the option for storing the rowkey of an entry in the ACL table 
> in the cell ACL tag instead of the complete serialization. 
> The advantages would be reduction of unnecessary duplication, and, like ACLs 
> at other granularities, a GRANT or REVOKE which updates the ACL table will 
> update access control rules for all affected cells. The disadvantage would be 
> in order to process the reference to the ACL for each cell with an ACL 
> reference in a tag we will need to look up the ACL in the ACL table.

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