Apache Hadoop Abbreviations/Terms

Hadoop Terms

HDFS - Hadoop Distributed File System GFS - Google File System NN - NameNode DN - Data Node SNN - Secondary NameNode JT - Job Tracker TT - Task Tracker HA NN - Highly Available NameNode (or NN HA - NameNode Highly Available) REST - Representational State Transfer HiveQL - Hive SQL HAR - Hadoop Archive ORC - Optimized Row Columnar JSON - Java Script Object Notation CDH - Cloudera’s Distribution Including Apache Hadoop ZKFC - ZooKeeper Failover Controller FUSE - Filesystem In Userspace YARN - Yet Another Resource Negotiator Amazon EC2 - Amazon Elastic Compute Cloud Amazon S3 - Amazon Simple Storage Service WASB - Windows Azure Storage Blobs (WASB) EMR - Elastic MapReduce JAR - Java ARchive RPC - Remote Procedure Call UDFs - user-defined functions ETL - Extract/Transform/Load

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