##### 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 0.10.0 - 2007-01-05

### NEW FEATURES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-454 | hadoop du optionally behave like unix’s du -s | Trivial | . | Marco Nicosia | Hairong Kuang
HADOOP-574 | want FileSystem implementation for Amazon S3 | Major | fs | Doug Cutting | Tom White
HADOOP-811 | Patch to support multi-threaded MapRunnable | Major | . | Alejandro Abdelnur | Doug Cutting
HADOOP-681 | Adminstrative hook to pull live nodes out of a HDFS cluster | Major | . | dhruba borthakur | dhruba borthakur

### IMPROVEMENTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-763 | NameNode benchmark using mapred is insufficient | Minor | test | Nigel Daley | Nigel Daley
HADOOP-621 | When a dfs -cat command is killed by the user, the correspondig hadoop process does not get aborted | Minor | . | dhruba borthakur | dhruba borthakur
HADOOP-676 | JobClient should print user friendly messages for standard errors | Major | . | Owen O’Malley | Sanjay Dahiya
HADOOP-756 | new dfsadmin command to wait until safe mode is exited | Minor | . | Owen O’Malley | dhruba borthakur
HADOOP-331 | map outputs should be written to a single output file with an index | Major | . | eric baldeschwieler | Devaraj Das
HADOOP-796 | Node failing tasks and failed tasks should be more easily accessible through jobtracker history. | Minor | . | Sanjay Dahiya | Sanjay Dahiya
HADOOP-806 | NameNode WebUI : Include link to each of datanodes | Minor | . | Raghu Angadi | Raghu Angadi
HADOOP-618 | JobProfile and JobSubmissionProtocol should be public | Major | . | Runping Qi | Arun C Murthy
HADOOP-571 | Path should use URI syntax | Major | fs | Doug Cutting | Doug Cutting
HADOOP-720 | Write a white paper on Hadoop File System Architecture, Design and Features | Major | documentation | dhruba borthakur | dhruba borthakur
HADOOP-717 | When there are few reducers, sorting should be done by mappers | Major | . | arkady borkovsky | Owen O’Malley
HADOOP-451 | Add a Split interface | Major | . | Doug Cutting | Owen O’Malley
HADOOP-783 | Hadoop dfs -put and -get accept ‘-’ to indicate stdin/stdout | Minor | . | Marco Nicosia | Wendy Chien
HADOOP-837 | RunJar should unpack jar files into hadoop.tmp.dir | Major | util | Hairong Kuang | Hairong Kuang
HADOOP-850 | Add Writable implementations for variable-length integer types. | Minor | io | Andrzej Bialecki | Andrzej Bialecki
HADOOP-525 | Need raw comparators for hadoop record types | Major | record | Sameer Paranjpye | Milind Bhandarkar
HADOOP-804 | Cut down on the “mumbling” in the Task process’ stdout/stderr | Major | . | Owen O’Malley | Sanjay Dahiya
HADOOP-853 | Move site directories to docs directories | Minor | documentation | Nigel Daley | Doug Cutting
HADOOP-371 | ant tar should package contrib jars | Major | build | Michel Tourn | Nigel Daley
HADOOP-470 | Some improvements in the DFS content browsing UI | Minor | . | Devaraj Das | Hairong Kuang
HADOOP-619 | Unify Map-Reduce and Streaming to take the same globbed input specification | Major | . | eric baldeschwieler | Sanjay Dahiya

### BUG FIXES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-777 | the tasktracker hostname is not fully qualified | Minor | . | Mahadev konar | Mahadev konar
HADOOP-752 | Possible locking issues in HDFS Namenode | Major | . | dhruba borthakur | dhruba borthakur
HADOOP-629 | none of the rpc servers check the protcol name for validity | Major | ipc | Owen O’Malley | Owen O’Malley
HADOOP-774 | Datanodes fails to heartbeat when a directory with a large number of blocks is deleted | Major | . | dhruba borthakur | dhruba borthakur
HADOOP-738 | dfs get or copyToLocal should not copy crc file | Major | . | Milind Bhandarkar | Milind Bhandarkar
HADOOP-770 | When JobTracker gets restarted, Job Tracker History doesn’t show the jobs that were running. (incomplete jobs) | Minor | . | Koji Noguchi | Sanjay Dahiya
HADOOP-546 | Task tracker doesnt generate job.xml in jobcache for some tasks ( possibly for only rescheduled tasks) | Critical | . | Sanjay Dahiya | Arun C Murthy
HADOOP-737 | TaskTracker’s job cleanup loop should check for finished job before deleting local directories | Critical | . | Sanjay Dahiya | Arun C Murthy
HADOOP-818 | ant clean test-contrib doesn’t work | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-786 | PhasedFileSystem should use debug level log for ignored exception. | Trivial | . | Sanjay Dahiya | Sanjay Dahiya
HADOOP-764 | The memory consumption of processReport() in the namenode can be reduced | Major | . | dhruba borthakur | dhruba borthakur
HADOOP-802 | mapred.speculative.execution description in hadoop-defauls.xml is not complete | Trivial | conf | Nigel Daley | Nigel Daley
HADOOP-782 | TaskTracker.java:killOverflowingTasks & TaskTracker.java:markUnresponsiveTasks only put the tip in tasksToCleanup queue, they don’t update the runningJobs | Major | . | Arun C Murthy | Arun C Murthy
HADOOP-792 | Invalid dfs -mv can trash your entire dfs | Major | . | Chris Schneider |
HADOOP-673 | the task execution environment should have a current working directory that is task specific | Major | . | Owen O’Malley | Mahadev konar
HADOOP-794 | JobTracker crashes with ArithmeticException | Major | . | Nigel Daley | Owen O’Malley
HADOOP-824 | DFSShell should become FSShell | Major | . | Doug Cutting |
HADOOP-813 | map tasks lost during sort | Major | . | Owen O’Malley | Devaraj Das
HADOOP-825 | If the default file system is set using the new uri syntax, the namenode will not start | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-596 | TaskTracker taskstatus’s phase doesnt get updated on phase transition causing wrong values displayed in WI | Major | . | Sanjay Dahiya | Sanjay Dahiya
HADOOP-829 | Separate the datanode contents that is written to the fsimage vs the contents used in over-the-wire communication | Major | . | dhruba borthakur | dhruba borthakur
HADOOP-823 | DataNode will not start up if any directories from dfs.data.dir are missing | Major | . | Bryan Pendleton | Sameer Paranjpye
HADOOP-814 | Increase dfs scalability by optimizing locking on namenode. | Major | . | dhruba borthakur | dhruba borthakur
HADOOP-835 | conf not set for the default Codec when initializing a Reader for a record-compressed sequence file | Major | io | Hairong Kuang | Hairong Kuang
HADOOP-836 | unit tests fail on windows (/C:/cygwin/… is invalid) | Major | . | Owen O’Malley | Owen O’Malley
HADOOP-841 | native hadoop libraries don’t build properly with 64-bit OS and a 32-bit jvm | Major | build | Arun C Murthy | Arun C Murthy
HADOOP-838 | TaskRunner.run() doesn’t pass along the ‘java.library.path’ to the child (task) jvm | Major | . | Arun C Murthy | Arun C Murthy
HADOOP-844 | Metrics messages are sent on a fixed-delay schedule instead of a fixed-rate schedule | Minor | metrics | David Bowen |
HADOOP-849 | randomwriter fails with ‘java.lang.OutOfMemoryError: Java heap space’ in the ‘reduce’ task | Major | . | Arun C Murthy | Devaraj Das
HADOOP-745 | NameNode throws FileNotFoundException: Parent path does not exist on startup | Major | . | Nigel Daley | dhruba borthakur
HADOOP-628 | hadoop hdfs -cat replaces some characters with question marks. | Major | . | arkady borkovsky | Wendy Chien
HADOOP-846 | Progress report is not sent during the intermediate sorts in the map phase | Major | . | Devaraj Das | Devaraj Das
HADOOP-840 | the task tracker is getting blocked by long deletes of local files | Major | . | Owen O’Malley | Mahadev konar
HADOOP-700 | bin/hadoop includes in classpath all jar files in HADOOP_HOME | Major | scripts | Nigel Daley | Doug Cutting