Apache ZooKeeper is a software project of the Apache Software Foundation, providing an open source distributed configuration service, synchronization service, and naming registry for large distributed systems.
A relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model. Structured Query Language (SQL) is a special-purpose programming language designed for managing data held in a RDBMS.
Apache Kafka is an open source publish-subscribe based distributed messaging system. From the architecture perspective, Kafka is closer to traditional messaging systems such as ActiveMQ or RabitMQ. However from a Big Data and Hadoop perspective, Kafka can be compared with Scribe or Flume as it is useful for processing activity stream data.
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