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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13513) Row granularity data keys
Date Mon, 20 Apr 2015 18:56:01 GMT
Andrew Purtell created HBASE-13513:

             Summary: Row granularity data keys
                 Key: HBASE-13513
                 URL: https://issues.apache.org/jira/browse/HBASE-13513
             Project: HBase
          Issue Type: Sub-task
            Reporter: Andrew Purtell

Currently we can only set data keys at column family granularity. Consider support for setting
data keys per row. Then tenant specific data keys in a multitenant table becomes possible.

HBASE-13512 proposes to do this per region, which is much easier to achieve than what is proposed
here, since we'd only vary the existing policy for assigning data keys to whole HFiles. However
it seems not that difficult to do this per row.

When encrypting HFiles we apply encryption on a per block basis, so per row encryption can
be achievable if internal to an HFile we are willing to pack cells into blocks by row. With
per-row encryption active we would start a new block after we're done with cells for a given
row. The result would be an HFile with blocks of varying size each including a data key reference
in the block header, and presumably the set of relevant data keys stored in a meta block.
Looks like the HFile writer code will let us do that readily, but performance concerns and
knock-on effects in block caching could make things interesting.

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