It requires four components be configured and understood: Pulsar servers (brokers) plus Apache BookKeeper (bookies) plus Apache ZooKeeper servers as well as the RocksDB database used by BookKeeper. Pulsar has a heavy-weight architecture that is the most complex in this comparison. These ease cluster management significantly. The Kafka ecosystem includes two different mature Kubernetes operators, one open source and one commercial. Zookeeper adds an additional level of complexity but the community is in the process of removing the ZooKeeper component from Kafka which will significantly decrease Kafka's operational burden. Kafka is a cluster-based technology with a medium-weight architecture requiring two distributed components: Kafka's own servers (brokers) plus ZooKeeperâ„¢ servers.
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