de253d21__HBase_vs__BigTable_Comparison__Feature
[Google BigTable] Chubby [Apache HBase] ZooKeeper [Notes] There is a difference in where ZooKeeper is used to coordinate tasks in HBase as opposed to provide locking services. Overall though ZooKeeper does for HBase pretty much what Chubby does for BigTable with slightly different semantics. [Feature] 
Lock Service
Lineland: HBase vs. BigTable Comparison
Feature