Definition of ZooKeeper

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

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.

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.

What is the function of ZooKeeper in 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.

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 Kafka
Kafka is a distributed, partitioned, and replicated message publishing and subscription system that provides features similar to the Java Message Service (JMS). Kafka features message persistence, high throughput, distribution, multi-client support, and real-time processing, and applies to online and offline message consumption. It is ideal for Internet service data collection scenarios, such as conventional data collection, active website tracing, aggregation of operation data in statistics systems (monitoring data), and log collection.

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