What is the function of ZooKeeper in HDFS?

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ZooKeeper Failover Controller (ZKFC) is the client of a ZooKeeper cluster that monitors the status of HDFS NameNodes. The ZKFC process is deployed only on the node where a NameNode is deployed. It can be deployed on both the active and standby NameNodes.

Other related questions:
What is the concept of ZooKeeper?
ZooKeeper is an open-source, distributed application coordination service. It prevents single points of failure and helps create reliable distributed applications.

What is the relationship between ZooKeeper and HDFS?
ZooKeeper Failover Controller (ZKFC) is the client of a ZooKeeper cluster that monitors the status of HDFS NameNodes. The ZKFC process is deployed only on the node where a NameNode is deployed. It can be deployed on both the active and standby NameNodes.

Definition of ZooKeeper
ZooKeeper is an open-source, distributed application coordination service. It prevents single points of failure and helps create reliable distributed applications.

Relationship between ZooKeeper and HDFS
ZooKeeper Failover Controller (ZKFC) is the client of a ZooKeeper cluster that monitors the status of HDFS NameNodes. The ZKFC process is deployed only on the node where a NameNode is deployed. It can be deployed on both the active and standby NameNodes.

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