##### General

- Overview
- Single Node Setup
- Cluster Setup
- Commands Reference
- FileSystem Shell
- Compatibility Specification
- Downstream Developer's Guide
- Admin Compatibility Guide
- Interface Classification
- FileSystem Specification

##### Common

- CLI Mini Cluster
- Native Libraries
- Proxy User
- Rack Awareness
- Secure Mode
- Service Level Authorization
- HTTP Authentication
- Credential Provider API
- Hadoop KMS
- Tracing
- Unix Shell Guide

##### HDFS

- Architecture
- User Guide
- Commands Reference
- NameNode HA With QJM
- NameNode HA With NFS
- Observer NameNode
- Federation
- ViewFs
- ViewFsOverloadScheme
- Snapshots
- Edits Viewer
- Image Viewer
- Permissions and HDFS
- Quotas and HDFS
- libhdfs (C API)
- WebHDFS (REST API)
- HttpFS
- Short Circuit Local Reads
- Centralized Cache Management
- NFS Gateway
- Rolling Upgrade
- Extended Attributes
- Transparent Encryption
- Multihoming
- Storage Policies
- Memory Storage Support
- Synthetic Load Generator
- Erasure Coding
- Disk Balancer
- Upgrade Domain
- DataNode Admin
- Router Federation
- Provided Storage

##### MapReduce

- Tutorial
- Commands Reference
- Compatibility with 1.x
- Encrypted Shuffle
- Pluggable Shuffle/Sort
- Distributed Cache Deploy
- Support for YARN Shared Cache

##### MapReduce REST APIs

- MR Application Master
- MR History Server

##### YARN

- Architecture
- Commands Reference
- Capacity Scheduler
- Fair Scheduler
- ResourceManager Restart
- ResourceManager HA
- Resource Model
- Node Labels
- Node Attributes
- Web Application Proxy
- Timeline Server
- Timeline Service V.2
- Writing YARN Applications
- YARN Application Security
- NodeManager
- Running Applications in Docker Containers
- Using CGroups
- Secure Containers
- Registry
- Reservation System
- Graceful Decommission
- Opportunistic Containers
- YARN Federation
- Shared Cache
- Using GPU
- Using FPGA
- Placement Constraints
- YARN UI2

##### YARN REST APIs

- Introduction
- Resource Manager
- Node Manager
- Timeline Server
- Timeline Service V.2

##### YARN Service

- Overview
- QuickStart
- Concepts
- Yarn Service API
- Service Discovery
- System Services

##### Submarine

- Index
- QuickStart
- Examples

##### Hadoop Compatible File Systems

- Aliyun OSS
- Amazon S3
- Azure Blob Storage
- Azure Data Lake Storage
- OpenStack Swift

##### Auth

- Overview
- Examples
- Configuration
- Building

##### Tools

- Hadoop Streaming
- Hadoop Archives
- Hadoop Archive Logs
- DistCp
- GridMix
- Rumen
- Resource Estimator Service
- Scheduler Load Simulator
- Hadoop Benchmarking

##### Reference

- Changelog and Release Notes
- Java API docs
- Unix Shell API
- Metrics

##### Configuration

- core-default.xml
- hdfs-default.xml
- hdfs-rbf-default.xml
- mapred-default.xml
- yarn-default.xml
- kms-default.xml
- httpfs-default.xml
- Deprecated Properties

# Apache Hadoop Changelog

## Release 1.0.2 - 2012-04-03

### NEW FEATURES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-7206 | Integrate Snappy compression | Major | . | Eli Collins | Alejandro Abdelnur

### IMPROVEMENTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-1722 | Make streaming to handle non-utf8 byte array | Major | . | Runping Qi | Klaas Bosteels
HADOOP-5450 | Add support for application-specific typecodes to typed bytes | Blocker | . | Klaas Bosteels | Klaas Bosteels
HDFS-2701 | Cleanup FS* processIOError methods | Major | namenode | Eli Collins | Eli Collins
HDFS-3075 | Backport HADOOP-4885 to branch-1 | Major | namenode | Brandon Li | Brandon Li
HADOOP-8090 | rename hadoop 64 bit rpm/deb package name | Major | . | Giridharan Kesavan | Giridharan Kesavan

### BUG FIXES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
MAPREDUCE-764 | TypedBytesInput’s readRaw() does not preserve custom type codes | Blocker | contrib/streaming | Klaas Bosteels | Klaas Bosteels
HDFS-2703 | removedStorageDirs is not updated everywhere we remove a storage dir | Major | namenode | Eli Collins | Eli Collins
HDFS-2702 | A single failed name dir can cause the NN to exit | Critical | namenode | Eli Collins | Eli Collins
MAPREDUCE-3824 | Distributed caches are not removed properly | Critical | distributed-cache | Allen Wittenauer | Thomas Graves
HADOOP-8050 | Deadlock in metrics | Major | metrics | Kihwal Lee | Kihwal Lee
MAPREDUCE-3583 | ProcfsBasedProcessTree#constructProcessInfo() may throw NumberFormatException | Critical | . | Ted Yu | Ted Yu
HDFS-3006 | Webhdfs “SETOWNER” call returns incorrect content-type | Major | webhdfs | bc Wong | Tsz Wo Nicholas Sze
HDFS-3101 | cannot read empty file using webhdfs | Major | webhdfs | Zhanwei Wang | Tsz Wo Nicholas Sze
MAPREDUCE-3851 | Allow more aggressive action on detection of the jetty issue | Major | tasktracker | Kihwal Lee | Thomas Graves
HADOOP-8132 | 64bit secure datanodes do not start as the jsvc path is wrong | Major | . | Arpit Gupta | Arpit Gupta
HADOOP-8201 | create the configure script for native compilation as part of the build | Blocker | build | Giridharan Kesavan | Giridharan Kesavan