Table 2.

Hadoop components and their functionalities.

Hadoop component	Functions
(1) HDFS	Storage and replication
(2) MapReduce	Distributed processing and fault tolerance
(3) HBASE	Fast read/write access
(4) HCatalog	Metadata
(5) Pig	Scripting
(6) Hive	SQL
(7) Oozie	Workflow and scheduling
(8) ZooKeeper	Coordination
(9) Kafka	Messaging and data integration
(10) Mahout	Machine learning