##### 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 0.5.0 - 2006-08-04

### NEW FEATURES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-339 | making improvements to the jobclients to get information on currenlyl running jobs and the jobqueue | Minor | . | Mahadev konar | Mahadev konar
HADOOP-359 | add optional compression of map outputs | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-342 | Design/Implement a tool to support archival and analysis of logfiles. | Major | . | Arun C Murthy |
HADOOP-347 | Implement HDFS content browsing interface | Major | . | Devaraj Das | Devaraj Das
HADOOP-381 | keeping files for tasks that match regex on task id | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-386 | Periodically move blocks from full nodes to those with space | Major | . | Johan Oskarsson | Johan Oskarsson
HADOOP-369 | Added ability to copy all part-files into one output file | Trivial | . | Johan Oskarsson | Johan Oskarsson
HADOOP-412 | provide an input format that fetches a subset of sequence file records | Major | . | Hairong Kuang | Hairong Kuang
HADOOP-425 | a python word count example that runs under jython | Major | . | Owen O’Malley | Owen O’Malley

### IMPROVEMENTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-340 | Using wildcards in config pathnames | Minor | conf | Johan Oskarsson | Doug Cutting
HADOOP-355 | hadoopStreaming: fix APIs, -reduce NONE, StreamSequenceRecordReader | Major | . | Michel Tourn |
HADOOP-361 | junit with pure-Java hadoopStreaming combiner; remove CRLF in some files | Major | . | Michel Tourn |
HADOOP-252 | add versioning to RPC | Major | ipc | Yoram Arnon |
HADOOP-356 | Build and test hadoopStreaming nightly | Major | . | Michel Tourn |
HADOOP-341 | Enhance distcp to handle *http* as a ‘source protocol’. | Major | util | Arun C Murthy | Arun C Murthy
HADOOP-237 | Standard set of Performance Metrics for Hadoop | Major | metrics | Milind Bhandarkar | Milind Bhandarkar
HADOOP-260 | the start up scripts should take a command line parameter –config making it easy to run multiple hadoop installation on same machines | Minor | . | Mahadev konar | Milind Bhandarkar
HADOOP-321 | DatanodeInfo refactoring | Major | . | Konstantin Shvachko | Konstantin Shvachko
HADOOP-302 | class Text (replacement for class UTF8) was: HADOOP-136 | Major | io | Michel Tourn | Hairong Kuang
HADOOP-335 | factor out the namespace image/transaction log writing | Major | . | Owen O’Malley | Konstantin Shvachko
HADOOP-396 | Writable DatanodeID | Major | . | Konstantin Shvachko | Konstantin Shvachko
HADOOP-395 | infoPort field should be a DatanodeID member | Major | . | Konstantin Shvachko | Devaraj Das
HADOOP-345 | JobConf access to name-values | Major | . | Michel Tourn | Michel Tourn
HADOOP-409 | expose JobConf properties as environment variables | Major | . | Michel Tourn |
HADOOP-392 | Improve the UI for DFS content browsing | Major | . | Devaraj Das |
HADOOP-410 | Using HashMap instead of TreeMap for some maps in Namenode yields 17% performance improvement | Major | . | Milind Bhandarkar | Milind Bhandarkar
HADOOP-394 | MiniDFSCluster shudown order | Minor | . | Konstantin Shvachko | Konstantin Shvachko

### BUG FIXES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-352 | Portability of hadoop shell scripts for deployment | Major | . | Jean-Baptiste Quenot |
HADOOP-313 | A stand alone driver for individual tasks | Major | . | Michel Tourn | Michel Tourn
HADOOP-358 | NPE in Path.equals | Major | fs | Frédéric Bertin | Doug Cutting
HADOOP-327 | ToolBase calls System.exit | Major | util | Owen O’Malley | Hairong Kuang
HADOOP-360 | hadoop-daemon starts but does not stop servers under cygWin | Major | . | Konstantin Shvachko |
HADOOP-354 | All daemons should have public methods to start and stop them | Major | . | Barry Kaplan |
HADOOP-364 | rpc versioning broke out-of-order server launches | Major | ipc | Owen O’Malley | Owen O’Malley
HADOOP-365 | datanode crashes on startup with ClassCastException | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-350 | In standalone mode, ‘org.apache.commons.cli cannot be resolved’ | Minor | . | stack |
HADOOP-368 | DistributedFSCheck should cleanup, seek, and report missing files. | Minor | fs | Konstantin Shvachko | Konstantin Shvachko
HADOOP-376 | Datanode does not scan for an open http port | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-384 | improved error messages for file checksum errors | Minor | fs | Owen O’Malley | Owen O’Malley
HADOOP-344 | TaskTracker passes incorrect file path to DF under cygwin | Major | . | Konstantin Shvachko | Konstantin Shvachko
HADOOP-383 | unit tests fail on windows | Major | . | Owen O’Malley | Michel Tourn
HADOOP-380 | The reduce tasks poll for mapoutputs in a loop | Major | . | Mahadev konar | Mahadev konar
HADOOP-387 | LocalJobRunner assigns duplicate mapid’s | Major | . | Sami Siren |
HADOOP-385 | rcc does not generate correct Java code for the field of a record type | Major | . | Hairong Kuang | Milind Bhandarkar
HADOOP-388 | the hadoop-daemons.sh fails with “no such file or directory” when used from a relative path | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-375 | Introduce a way for datanodes to register their HTTP info ports with the NameNode | Major | . | Devaraj Das | Devaraj Das
HADOOP-389 | MiniMapReduce tests get stuck because of some timing issues with initialization of tasktrackers. | Major | . | Mahadev konar | Mahadev konar
HADOOP-391 | test-contrib with spaces in classpath (Windows) | Major | . | Michel Tourn |
HADOOP-362 | tasks can get lost when reporting task completion to the JobTracker has an error | Major | . | Devaraj Das | Owen O’Malley
HADOOP-393 | The validateUTF function of class Text throws MalformedInputException for valid UTF8 code containing ascii chars | Major | io | Hairong Kuang | Hairong Kuang
HADOOP-404 | Regression tests are not working. | Major | . | Mahadev konar |
HADOOP-377 | Configuration does not handle URL | Major | . | Jean-Baptiste Quenot |
HADOOP-226 | DFSShell problems. Incorrect block replication detection in fsck. | Major | . | Konstantin Shvachko |
HADOOP-415 | DFSNodesStatus() should sort data nodes. | Major | . | Konstantin Shvachko |

### TESTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-411 | junit test for HADOOP-59: support generic command-line options | Major | . | Hairong Kuang | Hairong Kuang
HADOOP-418 | hadoopStreaming test jobconf -> env.var. mapping | Major | . | Michel Tourn |

### OTHER:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-351 | Remove Jetty dependency | Major | ipc | Barry Kaplan | Devaraj Das
HADOOP-307 | Many small jobs benchmark for MapReduce | Minor | . | Sanjay Dahiya | Sanjay Dahiya