To discuss all the new and potential issues coming out of the change in key format (HBASE-1234): zero-copy reads, client binary protocol, update of API (HBASE-880), server optimizations, etc...
merge tool expects regions all have different sequence ids
HBase Native Client Library
New client server implementation of how gets and puts are handled.
get with timestamp will return a value if there is a version with an earlier timestamp
Support for specifying a timestamp and numVersions on a per-column basis
[hbase] Add a means of scanning over all versions
commit(BatchUpdate) method should return timestamp
If millions of columns in a column family, hbase scanner won't come up
Scanner spins when there are concurrent inserts to column family
[hbase] Create an HBase-specific MapFile implementation
Change HBase StoreKey format