What is the role of ZooKeeper in HBase?
ZooKeeper plays a crucial role in HBase, mainly in the following aspects:
- Coordination Service: ZooKeeper is used to manage the state information of each node in the HBase cluster, coordinating communication and collaboration between nodes to ensure consistency and reliability within the cluster.
- Metadata Management: Metadata information of HBase, such as table structure and region distribution, is stored in ZooKeeper. HBase uses ZooKeeper to access and maintain this metadata information.
- Election mechanism: The Master node in the HBase cluster is elected by ZooKeeper, which is responsible for monitoring the status of the Master node and conducting a re-election when the Master node fails.
- ZooKeeper offers a mechanism for managing distributed locks, which HBase can utilize to ensure data consistency and concurrency.
In conclusion, ZooKeeper plays a role in HBase similar to that of a coordinator and metadata manager, providing the necessary support for the stable operation and high availability of the HBase cluster.