Hbase doesn’t have partitions.  It has regions.

The split occurs against the regions so that if you have n regions, you have n splits.

Please don’t confuse partitions and regions because they are not the same or synonymous.
The opinions expressed here are mine, while they may reflect a cognitive thought, that is purely accidental.
Use at your own risk.
Michael Segel
michael_segel (AT) hotmail.com