##### 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 0.2.0 - 2006-05-05

### NEW FEATURES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-51 | per-file replication counts | Major | . | Doug Cutting | Konstantin Shvachko
HADOOP-148 | add a failure count to task trackers | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-132 | An API for reporting performance metrics | Major | . | David Bowen |
HADOOP-189 | Add job jar lib, classes, etc. to CLASSPATH when in standalone mode | Major | . | stack | Doug Cutting
HADOOP-65 | add a record I/O framework to hadoop | Minor | io, ipc | Sameer Paranjpye |
HADOOP-191 | add hadoopStreaming to src/contrib | Major | . | Michel Tourn | Doug Cutting

### IMPROVEMENTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-116 | cleaning up /tmp/hadoop/mapred/system | Major | . | raghavendra prabhu | Doug Cutting
HADOOP-131 | Separate start/stop-dfs.sh and start/stop-mapred.sh scripts | Minor | . | Chris A. Mattmann | Doug Cutting
HADOOP-129 | FileSystem should not name files with java.io.File | Major | fs | Doug Cutting | Doug Cutting
HADOOP-144 | the dfs client id isn’t relatable to the map/reduce task ids | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-114 | Non-informative error message | Trivial | . | Rod Taylor | Doug Cutting
HADOOP-142 | failed tasks should be rescheduled on different hosts after other jobs | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-138 | stop all tasks | Trivial | . | Stefan Groschupf | Doug Cutting
HADOOP-150 | tip and task names should reflect the job name | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-166 | IPC is unable to invoke methods that use interfaces as parameter | Minor | ipc | Stefan Groschupf | Doug Cutting
HADOOP-170 | setReplication and related bug fixes | Major | fs | Konstantin Shvachko | Konstantin Shvachko
HADOOP-173 | optimize allocation of tasks w/ local data | Major | . | Doug Cutting | Doug Cutting
HADOOP-167 | reducing the number of Configuration & JobConf objects created | Major | conf | Owen O’Malley | Owen O’Malley
HADOOP-177 | improvement to browse through the map/reduce tasks | Minor | . | Mahadev konar | Mahadev konar
HADOOP-178 | piggyback block work requests to heartbeats and move block replication/deletion startup delay from datanodes to namenode | Major | . | Hairong Kuang | Hairong Kuang
HADOOP-198 | adding owen’s examples to exampledriver | Minor | . | Mahadev konar | Mahadev konar
HADOOP-96 | name server should log decisions that affect data: block creation, removal, replication | Critical | . | Yoram Arnon | Hairong Kuang

### BUG FIXES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-117 | mapred temporary files not deleted | Blocker | . | raghavendra prabhu | Doug Cutting
HADOOP-125 | LocalFileSystem.makeAbsolute bug on Windows | Minor | fs | p sutter | Doug Cutting
HADOOP-126 | “hadoop dfs -cp” does not copy crc files | Major | . | Konstantin Shvachko | Konstantin Shvachko
HADOOP-92 | Error Reporting/logging in MapReduce | Minor | . | Mahadev konar | Mahadev konar
HADOOP-128 | Failure to replicate dfs block kills client | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-118 | Namenode does not always clean up pendingCreates | Critical | . | Owen O’Malley | Owen O’Malley
HADOOP-139 | Deadlock in LocalFileSystem lock/release | Major | fs | Igor Bolotin | Doug Cutting
HADOOP-134 | JobTracker trapped in a loop if it fails to localize a task | Major | . | Runping Qi | Owen O’Malley
HADOOP-133 | the TaskTracker.Child.ping thread calls exit | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-143 | exception call stacks are word wrapped in webapp | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-151 | RPC code has socket leak? | Major | ipc | p sutter | Doug Cutting
HADOOP-69 | Unchecked lookup value causes NPE in FSNamesystemgetDatanodeHints | Major | . | Bryan Pendleton |
HADOOP-68 | “Cannot abandon block during write to <file>” and “Cannot obtain additional block for file <file>” errors during dfs write test | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-157 | job fails because pendingCreates is not cleaned up after a task fails | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-162 | concurrent modification exception in FSNamesystem.Lease.releaseLocks | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-160 | sleeping with locks held | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-168 | JobSubmissionProtocol and InterTrackerProtocol don’t include “throws IOException” on all methods | Minor | . | Owen O’Malley | Owen O’Malley
HADOOP-169 | a single failure from locateMapOutputs kills the entire job | Critical | . | Owen O’Malley | Owen O’Malley
HADOOP-172 | rpc doesn’t handle returning null for a String[] | Blocker | ipc | Owen O’Malley | Owen O’Malley
HADOOP-174 | jobclient kills job for one timeout | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-183 | adjust file replication factor when loading image and edits according to replication.min and replication.max | Minor | . | Hairong Kuang | Hairong Kuang
HADOOP-137 | Different TaskTrackers may get the same task tracker id, thus cause many problems. | Critical | . | Runping Qi | Owen O’Malley
HADOOP-186 | communication problems in the task tracker cause long latency | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-188 | more unprotected RPC calls in JobClient.runJob allow loss of job due to timeout | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-185 | tasks are lost during pollForNewTask | Critical | . | Owen O’Malley | Owen O’Malley
HADOOP-190 | Job fails though task succeeded if we fail to exit | Major | . | stack |
HADOOP-192 | Trivial JRE 1.5 versus 1.4 bug | Blocker | . | David Bowen |
HADOOP-182 | lost task trackers should not update status of completed jobs | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-63 | problem with webapp when start a jobtracker | Minor | . | Hairong Kuang | Hairong Kuang

### TESTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-187 | simple distributed dfs random data writer & sort example applications | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-184 | hadoop nightly build and regression test on a cluster | Minor | . | Mahadev konar | Mahadev konar
HADOOP-193 | DFS i/o benchmark. | Major | fs | Konstantin Shvachko | Konstantin Shvachko
HADOOP-194 | Distributed checkup of the file system consistency. | Major | . | Konstantin Shvachko | Konstantin Shvachko