General

• Overview
• Single Node Setup
• Cluster Setup
• Hadoop Commands Reference
• FileSystem Shell
• Hadoop Compatibility
• Interface Classification
• FileSystem Specification

Common

• CLI Mini Cluster
• Native Libraries
• Proxy User
• Rack Awareness
• Secure Mode
• Service Level Authorization
• HTTP Authentication
• Hadoop KMS
• Tracing

HDFS

• HDFS User Guide
• HDFS Commands Reference
• High Availability With QJM
• High Availability With NFS
• Federation
• ViewFs Guide
• HDFS Snapshots
• HDFS Architecture
• Edits Viewer
• Image Viewer
• Permissions and HDFS
• Quotas and HDFS
• HFTP
• C API libhdfs
• WebHDFS REST API
• HttpFS Gateway
• Short Circuit Local Reads
• Centralized Cache Management
• HDFS NFS Gateway
• HDFS Rolling Upgrade
• Extended Attributes
• Transparent Encryption
• HDFS Support for Multihoming
• Archival Storage, SSD & Memory
• Memory Storage Support

MapReduce

• MapReduce Tutorial
• MapReduce Commands Reference
• Compatibilty between Hadoop 1.x and Hadoop 2.x
• Encrypted Shuffle
• Pluggable Shuffle/Sort
• Distributed Cache Deploy

MapReduce REST APIs

• MR Application Master
• MR History Server

YARN

• Overview
• YARN Architecture
• Capacity Scheduler
• Fair Scheduler
• ResourceManager Restart
• ResourceManager HA
• Web Application Proxy
• YARN Timeline Server
• Writing YARN Applications
• YARN Commands
• NodeManager Restart
• DockerContainerExecutor
• Using CGroups
• Secure Containers
• Registry

YARN REST APIs

• Introduction
• Resource Manager
• Node Manager
• Timeline Server

Hadoop Compatible File Systems

• Amazon S3
• Azure Blob Storage
• OpenStack Swift

Auth

• Overview
• Examples
• Configuration
• Building

Tools

• Hadoop Streaming
• Hadoop Archives
• DistCp
• GridMix
• Rumen
• Scheduler Load Simulator

Reference

• Release Notes
• API docs
• Common CHANGES.txt
• HDFS CHANGES.txt
• MapReduce CHANGES.txt
• YARN CHANGES.txt
• Metrics

Configuration

• core-default.xml
• hdfs-default.xml
• mapred-default.xml
• yarn-default.xml
• Deprecated Properties

Apache Hadoop 2.7.1

Apache Hadoop 2.7.1 is a minor release in the 2.x.y release line, building upon the previous release 2.7.0. This is the next stable release after Apache Hadoop 2.6.x.

Here is a short overview of the major features and improvements since 2.6.x.

• IMPORTANT notes

  • This release drops support for JDK6 runtime and works with JDK 7+ only.

• Common

  • Support Windows Azure Storage - Blob as a file system in Hadoop.

• HDFS

  • Support for file truncate
  • Support for quotas per storage type
  • Support for files with variable-length blocks

• YARN

  • Make YARN authorization pluggable
  • Automatic shared, global caching of YARN localized resources (beta)

• MAPREDUCE

  • Ability to limit running Map/Reduce tasks of a job
  • Speed up FileOutputCommitter for very large jobs with many output files.

Getting Started

The Hadoop documentation includes the information you need to get started using Hadoop. Begin with the Single Node Setup which shows you how to set up a single-node Hadoop installation. Then move on to the Cluster Setup to learn how to set up a multi-node Hadoop installation.