Final answer:
Hadoop 2 consists of three open-source sub-projects maintained by the Apache Software Foundation: YARN, MapReduce, and HDFS.
Step-by-step explanation:
Hadoop 2 consists of three open-source sub-projects maintained by the Apache Software Foundation:
- YARN: Yet Another Resource Negotiator is the key component of Hadoop 2, responsible for managing resources and scheduling tasks.
- MapReduce: is a programming model and software framework for processing large amounts of data in parallel across a cluster of computers.
- HDFS: Hadoop Distributed File System is a distributed file system that provides high-performance access to data across multiple machines.