Database Reference
In-Depth Information
Figure 20-2. HBase cluster members
HBase depends on ZooKeeper (
Chapter 21
)
, and by default it manages a ZooKeeper in-
stance as the authority on cluster state, although it can be configured to use an existing
ZooKeeper cluster instead. The ZooKeeper ensemble hosts vitals such as the location of
the
hbase:meta
catalog table and the address of the current cluster master. Assignment
of regions is mediated via ZooKeeper in case participating servers crash mid-assignment.
Hosting the assignment transaction state in ZooKeeper makes it so recovery can pick up
