##### 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 1.0.0 - 2011-12-27

### INCOMPATIBLE CHANGES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HDFS-617 | Support for non-recursive create() in HDFS | Major | hdfs-client, namenode | Kan Zhang | Kan Zhang

### NEW FEATURES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HDFS-2137 | Datanode Disk Fail Inplace | Major | datanode | Bharath Mundlapudi |
HDFS-2316 | [umbrella] WebHDFS: a complete FileSystem implementation for accessing HDFS over HTTP | Major | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze

### IMPROVEMENTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-5124 | A few optimizations to FsNamesystem#RecentInvalidateSets | Major | . | Hairong Kuang | Hairong Kuang
HADOOP-7710 | create a script to setup application in order to create root directories for application such hbase, hcat, hive etc | Major | . | Arpit Gupta | Arpit Gupta
HADOOP-7664 | o.a.h.conf.Configuration complains of overriding final parameter even if the value with which its attempting to override is the same. | Minor | conf | Ravi Prakash | Ravi Prakash
MAPREDUCE-3169 | Create a new MiniMRCluster equivalent which only provides client APIs cross MR1 and MR2 | Major | mrv1, mrv2, test | Todd Lipcon | Ahmed Radwan
HDFS-2246 | Shortcut a local client reads to a Datanodes files directly | Major | . | Sanjay Radia | Jitendra Nath Pandey
HADOOP-7804 | enable hadoop config generator to set dfs.block.local-path-access.user to enable short circuit read | Major | conf | Arpit Gupta | Arpit Gupta
HDFS-2604 | Add a log message to show if WebHDFS is enabled | Minor | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
HADOOP-6886 | LocalFileSystem Needs createNonRecursive API | Minor | fs | Nicolas Spiegelberg | Nicolas Spiegelberg
HADOOP-6840 | Support non-recursive create() in FileSystem & SequenceFile.Writer | Minor | fs, io | Nicolas Spiegelberg | Nicolas Spiegelberg

### BUG FIXES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HDFS-611 | Heartbeats times from Datanodes increase when there are plenty of blocks to delete | Major | datanode | dhruba borthakur | Zheng Shao
HDFS-1257 | Race condition on FSNamesystem#recentInvalidateSets introduced by HADOOP-5124 | Major | namenode | Ramkumar Vadali | Eric Payne
HADOOP-7728 | hadoop-setup-conf.sh should be modified to enable task memory manager | Major | conf | Ramya Sunil | Ramya Sunil
HADOOP-7765 | Debian package contain both system and tar ball layout | Major | build | Eric Yang | Eric Yang
HDFS-2450 | Only complete hostname is supported to access data via hdfs:// | Major | . | Rajit Saha | Daryn Sharp
HADOOP-7740 | security audit logger is not on by default, fix the log4j properties to enable the logger | Minor | conf | Arpit Gupta | Arpit Gupta
HDFS-2065 | Fix NPE in DFSClient.getFileChecksum | Major | . | Bharath Mundlapudi | Uma Maheswara Rao G
HADOOP-7784 | secure datanodes fail to come up stating jsvc not found | Major | . | Arpit Gupta | Eric Yang
HDFS-1943 | fail to start datanode while start-dfs.sh is executed by root user | Blocker | scripts | Wei Yongjun | Matt Foley
MAPREDUCE-3374 | src/c++/task-controller/configure is not set executable in the tarball and that prevents task-controller from rebuilding | Major | task-controller | Roman Shaposhnik |
HDFS-2346 | TestHost2NodesMap & TestReplicasMap will fail depending upon execution order of test methods | Blocker | test | Uma Maheswara Rao G | Laxman
HADOOP-7816 | Allow HADOOP_HOME deprecated warning suppression based on config specified in hadoop-env.sh | Major | . | Dave Thompson | Dave Thompson
HDFS-2590 | Some links in WebHDFS forrest doc do not work | Major | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
HADOOP-7815 | Map memory mb is being incorrectly set by hadoop-setup-conf.sh | Minor | conf | Ramya Sunil | Ramya Sunil
MAPREDUCE-3480 | TestJvmReuse fails in 1.0 | Major | . | Jitendra Nath Pandey | Jitendra Nath Pandey
HADOOP-7865 | Test Failures in 1.0.0 hdfs/common | Major | . | Jitendra Nath Pandey | Jitendra Nath Pandey
HADOOP-7854 | UGI getCurrentUser is not synchronized | Critical | security | Daryn Sharp | Daryn Sharp
HADOOP-7869 | HADOOP_HOME warning happens all of the time | Critical | scripts | Owen O’Malley | Owen O’Malley
HADOOP-7461 | Jackson Dependency Not Declared in Hadoop POM | Major | build | Ron Bodkin | Giridharan Kesavan
HDFS-2589 | unnecessary hftp token fetch and renewal thread | Major | security | Daryn Sharp | Daryn Sharp
MAPREDUCE-3319 | multifilewc from hadoop examples seems to be broken in 0.20.205.0 | Blocker | examples | Roman Shaposhnik | Subroto Sanyal
HDFS-2673 | While Namenode processing the blocksBeingWrittenReport, it will log incorrect number blocks count | Trivial | namenode | Uma Maheswara Rao G | Uma Maheswara Rao G
HADOOP-7903 | hadoop artifacts do not contain 64 bit libhdfs native lib | Major | build | Arpit Gupta | Matt Foley
MAPREDUCE-1744 | DistributedCache creates its own FileSytem instance when adding a file/archive to the path | Major | . | Dick King | Dick King
HADOOP-7116 | raise contrib junit test jvm memory size to 512mb | Major | test | Owen O’Malley | Owen O’Malley
HADOOP-8067 | Errors building hadoop-gpl-compression with Hadoop 1.0.0 and HBase 0.92.0 | Major | build | John Lewis |
HDFS-838 | libhdfs causes a segfault due to race condition | Major | libhdfs | Brian Bockelman |
HADOOP-9128 | MetricsDynamicMBeanBase can cause high cpu load | Major | metrics | Nate Putnam |
HADOOP-8389 | MetricsDynamicMBeanBase throws IllegalArgumentException for empty attribute list | Major | metrics | Elias Ross |
MAPREDUCE-4935 | Support timeout limitation to MRv1 job end notifications | Major | jobtracker, mrv1 | Olga Shen | Brad Liu
MAPREDUCE-3475 | JT can’t renew its own tokens | Major | jobtracker | Daryn Sharp | Daryn Sharp

### SUB-TASKS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HDFS-2441 | webhdfs returns two content-type headers | Major | webhdfs | Arpit Gupta | Tsz Wo Nicholas Sze
HDFS-2428 | webhdfs api parameter validation should be better | Major | webhdfs | Arpit Gupta | Tsz Wo Nicholas Sze
HDFS-2424 | webhdfs liststatus json does not convert to a valid xml document | Major | webhdfs | Arpit Gupta | Tsz Wo Nicholas Sze
HDFS-2439 | webhdfs open an invalid path leads to a 500 which states a npe, we should return a 404 with appropriate error message | Major | webhdfs | Arpit Gupta | Tsz Wo Nicholas Sze
HDFS-2453 | tail using a webhdfs uri throws an error | Major | webhdfs | Arpit Gupta | Tsz Wo Nicholas Sze
HDFS-2427 | webhdfs mkdirs api call creates path with 777 permission, we should default it to 755 | Major | webhdfs | Arpit Gupta | Tsz Wo Nicholas Sze
HDFS-2501 | add version prefix and root methods to webhdfs | Major | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
HDFS-2494 | [webhdfs] When Getting the file using OP=OPEN with DN http address, ESTABLISHED sockets are growing. | Major | webhdfs | Uma Maheswara Rao G | Uma Maheswara Rao G
HDFS-2432 | webhdfs setreplication api should return a 403 when called on a directory | Major | webhdfs | Arpit Gupta | Tsz Wo Nicholas Sze
HDFS-2416 | distcp with a webhdfs uri on a secure cluster fails | Major | webhdfs | Arpit Gupta | Jitendra Nath Pandey
HDFS-2527 | Remove the use of Range header from webhdfs | Major | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
HDFS-2528 | webhdfs rest call to a secure dn fails when a token is sent | Major | webhdfs | Arpit Gupta | Tsz Wo Nicholas Sze
HDFS-2540 | Change WebHdfsFileSystem to two-step create/append | Major | . | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
HDFS-2539 | Support doAs and GETHOMEDIRECTORY in webhdfs | Major | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze

### OTHER:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HDFS-2552 | Add WebHdfs Forrest doc | Major | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
HADOOP-7923 | Automatically update doc versions | Major | build, documentation | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze