##### 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 1.1.0 - 2012-10-13

### INCOMPATIBLE CHANGES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-5464 | DFSClient does not treat write timeout of 0 properly | Major | . | Raghu Angadi | Raghu Angadi
HDFS-3044 | fsck move should be non-destructive by default | Major | namenode | Eli Collins | Colin P. McCabe
HADOOP-8154 | DNS#getIPs shouldn’t silently return the local host IP for bogus interface names | Major | conf | Eli Collins | Eli Collins
HADOOP-8314 | HttpServer#hasAdminAccess should return false if authorization is enabled but user is not authenticated | Major | security | Alejandro Abdelnur | Alejandro Abdelnur
HADOOP-8230 | Enable sync by default and disable append | Major | . | Eli Collins | Eli Collins
HDFS-3522 | If NN is in safemode, it should throw SafeModeException when getBlockLocations has zero locations | Major | namenode | Brandon Li | Brandon Li
HADOOP-8365 | Add flag to disable durable sync | Blocker | . | Eli Collins | Eli Collins
HADOOP-8552 | Conflict: Same security.log.file for multiple users. | Major | conf, security | Karthik Kambatla | Karthik Kambatla
HDFS-2617 | Replaced Kerberized SSL for image transfer and fsck with SPNEGO-based solution | Major | security | Jakob Homan | Jakob Homan

### NEW FEATURES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
MAPREDUCE-3118 | Backport Gridmix and Rumen features from trunk to Hadoop 0.20 security branch | Major | contrib/gridmix, tools/rumen | Ravi Gummadi | Ravi Gummadi
HADOOP-7806 | Support binding to sub-interfaces | Major | util | Harsh J | Harsh J
HDFS-3148 | The client should be able to use multiple local interfaces for data transfer | Major | hdfs-client, performance | Eli Collins | Eli Collins
HDFS-3055 | Implement recovery mode for branch-1 | Minor | . | Colin P. McCabe | Colin P. McCabe
MAPREDUCE-3837 | Job tracker is not able to recover job in case of crash and after that no user can submit job. | Major | . | Mayank Bansal | Mayank Bansal
HADOOP-7823 | port HADOOP-4012 to branch-1 (splitting support for bzip2) | Major | . | Tim Broberg | Andrew Purtell
HDFS-3150 | Add option for clients to contact DNs via hostname | Major | datanode, hdfs-client | Eli Collins | Eli Collins

### IMPROVEMENTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
MAPREDUCE-782 | Use PureJavaCrc32 in mapreduce spills | Minor | performance | Todd Lipcon | Todd Lipcon
HDFS-496 | Use PureJavaCrc32 in HDFS | Minor | datanode, hdfs-client, performance | Todd Lipcon | Todd Lipcon
MAPREDUCE-1906 | Lower default minimum heartbeat interval for tasktracker > Jobtracker | Major | jobtracker, performance, tasktracker | Scott Carey | Todd Lipcon
HADOOP-6995 | Allow wildcards to be used in ProxyUsers configurations | Minor | security | Todd Lipcon | Todd Lipcon
MAPREDUCE-2103 | task-controller shouldn’t require o-r permissions | Trivial | task-controller | Todd Lipcon | Todd Lipcon
MAPREDUCE-2836 | Provide option to fail jobs when submitted to non-existent pools. | Minor | contrib/fair-share | Jeff Bean | Ahmed Radwan
HADOOP-7509 | Improve message when Authentication is required | Trivial | . | Ravi Prakash | Ravi Prakash
HDFS-2465 | Add HDFS support for fadvise readahead and drop-behind | Major | datanode, performance | Todd Lipcon | Todd Lipcon
MAPREDUCE-3278 | 0.20: avoid a busy-loop in ReduceTask scheduling | Major | mrv1, performance, task | Todd Lipcon | Todd Lipcon
MAPREDUCE-3365 | Uncomment eventlog settings from the documentation | Trivial | contrib/fair-share | Sho Shimauchi | Sho Shimauchi
MAPREDUCE-3395 | Add mapred.disk.healthChecker.interval to mapred-default.xml | Trivial | documentation | Eli Collins | Eli Collins
MAPREDUCE-3394 | Add log guard for a debug message in ReduceTask | Trivial | task | Todd Lipcon | Todd Lipcon
HDFS-2638 | Improve a block recovery log | Minor | namenode | Eli Collins | Eli Collins
HDFS-2653 | DFSClient should cache whether addrs are non-local when short-circuiting is enabled | Major | datanode | Eli Collins | Eli Collins
HDFS-2654 | Make BlockReaderLocal not extend RemoteBlockReader2 | Major | datanode | Eli Collins | Eli Collins
MAPREDUCE-3597 | Provide a way to access other info of history file from Rumentool | Major | tools/rumen | Ravi Gummadi | Ravi Gummadi
MAPREDUCE-2919 | The JT web UI should show job start times | Minor | jobtracker | Eli Collins | Harsh J
HDFS-2872 | Add sanity checks during edits loading that generation stamps are non-decreasing | Major | namenode | Todd Lipcon | Colin P. McCabe
MAPREDUCE-4001 | Improve MAPREDUCE-3789’s fix logic by looking at job’s slot demands instead | Minor | capacity-sched | Harsh J | Harsh J
MAPREDUCE-2835 | Make per-job counter limits configurable | Major | . | Tom White | Tom White
HDFS-3131 | Improve TestStorageRestore | Minor | . | Tsz Wo Nicholas Sze | Brandon Li
HDFS-1378 | Edit log replay should track and report file offsets in case of errors | Major | namenode | Todd Lipcon | Colin P. McCabe
HADOOP-8209 | Add option to relax build-version check for branch-1 | Major | . | Eli Collins | Eli Collins
HDFS-3094 | add -nonInteractive and -force option to namenode -format command | Major | . | Arpit Gupta | Arpit Gupta
HADOOP-8430 | Backport new FileSystem methods introduced by HADOOP-8014 to branch-1 | Major | . | Eli Collins | Eli Collins
HDFS-3504 | Configurable retry in DFSClient | Major | hdfs-client | Siddharth Seth | Tsz Wo Nicholas Sze
HDFS-3516 | Check content-type in WebHdfsFileSystem | Major | hdfs-client, webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
HDFS-3596 | Improve FSEditLog pre-allocation in branch-1 | Minor | . | Colin P. McCabe | Colin P. McCabe
HDFS-3617 | Port HDFS-96 to branch-1 (support blocks greater than 2GB) | Major | . | Matt Foley | Harsh J
HDFS-3667 | Add retry support to WebHdfsFileSystem | Major | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
MAPREDUCE-3289 | Make use of fadvise in the NM’s shuffle handler | Major | mrv2, nodemanager, performance | Todd Lipcon | Todd Lipcon
HADOOP-8656 | backport forced daemon shutdown of HADOOP-8353 into branch-1 | Minor | bin | Steve Loughran | Roman Shaposhnik
MAPREDUCE-4511 | Add IFile readahead | Major | mrv1, mrv2, performance | Ahmed Radwan | Ahmed Radwan
HDFS-3814 | Make the replication monitor multipliers configurable in 1.x | Major | namenode | Suresh Srinivas | Jing Zhao
MAPREDUCE-4328 | Add the option to quiesce the JobTracker | Major | mrv1 | Arun C Murthy | Arun C Murthy
HADOOP-8748 | Move dfsclient retry to a util class | Minor | io | Arun C Murthy | Arun C Murthy
HDFS-3871 | Change NameNodeProxies to use HADOOP-8748 | Minor | hdfs-client | Arun C Murthy | Arun C Murthy
HDFS-3703 | Decrease the datanode failure detection time | Major | datanode, namenode | Nicolas Liochon | Jing Zhao
MAPREDUCE-4603 | Allow JobClient to retry job-submission when JT is in safemode | Major | . | Arun C Murthy | Arun C Murthy

### BUG FIXES:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
HADOOP-5836 | Bug in S3N handling of directory markers using an object with a trailing “/” causes jobs to fail | Major | fs/s3 | Ian Nowland | Ian Nowland
HADOOP-6546 | BloomMapFile can return false negatives | Major | io | Clark Jefcoat | Clark Jefcoat
HADOOP-6947 | Kerberos relogin should set refreshKrb5Config to true | Major | security | Todd Lipcon | Todd Lipcon
HDFS-2305 | Running multiple 2NNs can result in corrupt file system | Major | namenode | Aaron T. Myers | Aaron T. Myers
HADOOP-7629 | regression with MAPREDUCE-2289 - setPermission passed immutable FsPermission (rpc failure) | Major | . | Patrick Hunt | Todd Lipcon
HADOOP-7634 | Cluster setup docs specify wrong owner for task-controller.cfg | Minor | documentation, security | Eli Collins | Eli Collins
HADOOP-7665 | branch-0.20-security doesn’t include SPNEGO settings in core-default.xml | Major | security | Aaron T. Myers | Aaron T. Myers
HADOOP-7666 | branch-0.20-security doesn’t include o.a.h.security.TestAuthenticationFilter | Major | security | Aaron T. Myers | Aaron T. Myers
HADOOP-7621 | alfredo config should be in a file not readable by users | Critical | security | Alejandro Abdelnur | Aaron T. Myers
HADOOP-7653 | tarball doesn’t include .eclipse.templates | Minor | build | Jonathan Natkins | Jonathan Natkins
MAPREDUCE-2932 | Missing instrumentation plugin class shouldn’t crash the TT startup per design | Trivial | tasktracker | Harsh J | Harsh J
HADOOP-7745 | I switched variable names in HADOOP-7509 | Major | . | Ravi Prakash | Ravi Prakash
MAPREDUCE-3405 | MAPREDUCE-3015 broke compilation of contrib scheduler tests | Critical | capacity-sched, contrib/fair-share | Todd Lipcon | Todd Lipcon
MAPREDUCE-3419 | Don’t mark exited TT threads as dead in MiniMRCluster | Major | tasktracker, test | Eli Collins | Eli Collins
HADOOP-7297 | Error in the documentation regarding Checkpoint/Backup Node | Trivial | documentation | arnaud p | Harsh J
HDFS-2541 | For a sufficiently large value of blocks, the DN Scanner may request a random number with a negative seed value. | Major | datanode | Harsh J | Harsh J
MAPREDUCE-2905 | CapBasedLoadManager incorrectly allows assignment when assignMultiple is true (was: assignmultiple per job) | Major | contrib/fair-share | Jeff Bean | Jeff Bean
MAPREDUCE-2806 | [Gridmix] Load job fails with timeout errors when resource emulation is turned on | Major | contrib/gridmix | Amar Kamat | Amar Kamat
HADOOP-7870 | fix SequenceFile#createWriter with boolean createParent arg to respect createParent. | Major | . | Jonathan Hsieh | Jonathan Hsieh
HADOOP-7879 | DistributedFileSystem#createNonRecursive should also incrementWriteOps statistics. | Trivial | . | Jonathan Hsieh | Jonathan Hsieh
HDFS-2637 | The rpc timeout for block recovery is too low | Major | hdfs-client | Eli Collins | Eli Collins
HADOOP-7898 | Fix javadoc warnings in AuthenticationToken.java | Minor | security | Suresh Srinivas | Suresh Srinivas
HADOOP-7908 | Fix three javadoc warnings on branch-1 | Trivial | documentation | Eli Collins | Eli Collins
HDFS-2547 | ReplicationTargetChooser has incorrect block placement comments | Trivial | namenode | Harsh J | Harsh J
HDFS-2728 | Remove dfsadmin -printTopology from branch-1 docs since it does not exist | Minor | namenode | Harsh J | Harsh J
HDFS-2741 | dfs.datanode.max.xcievers missing in 0.20.205.0 | Minor | . | Markus Jelsma |
HDFS-1910 | when dfs.name.dir and dfs.name.edits.dir are same fsimage will be saved twice every time | Minor | namenode | Gokul |
HDFS-2790 | FSNamesystem.setTimes throws exception with wrong configuration name in the message | Minor | . | Arpit Gupta | Arpit Gupta
HADOOP-7982 | UserGroupInformation fails to login if thread’s context classloader can’t load HadoopLoginModule | Major | security | Todd Lipcon | Todd Lipcon
HDFS-2751 | Datanode drops OS cache behind reads even for short reads | Major | datanode | Todd Lipcon | Todd Lipcon
HADOOP-7988 | Upper case in hostname part of the principals doesn’t work with kerberos. | Major | . | Jitendra Nath Pandey | Jitendra Nath Pandey
HDFS-2877 | If locking of a storage dir fails, it will remove the other NN’s lock file on exit | Major | namenode | Todd Lipcon | Todd Lipcon
MAPREDUCE-3789 | CapacityTaskScheduler may perform unnecessary reservations in heterogenous tracker environments | Critical | capacity-sched, scheduler | Harsh J | Harsh J
HDFS-2869 | Error in Webhdfs documentation for mkdir | Minor | webhdfs | Harsh J | Harsh J
HDFS-3008 | Negative caching of local addrs doesn’t work | Major | hdfs-client | Eli Collins | Eli Collins
HDFS-3078 | 2NN https port setting is broken | Major | . | Eli Collins | Eli Collins
MAPREDUCE-1740 | NPE in getMatchingLevelForNodes when node locations are variable depth | Major | jobtracker | Todd Lipcon | Ahmed Radwan
HADOOP-8159 | NetworkTopology: getLeaf should check for invalid topologies | Major | . | Colin P. McCabe | Colin P. McCabe
MAPREDUCE-4087 | [Gridmix] GenerateDistCacheData job of Gridmix can become slow in some cases | Major | . | Ravi Gummadi | Ravi Gummadi
MAPREDUCE-4095 | TestJobInProgress#testLocality uses a bogus topology | Major | . | Eli Collins | Colin P. McCabe
HDFS-3176 | JsonUtil should not parse the MD5MD5CRC32FileChecksum bytes on its own. | Major | hdfs-client | Kihwal Lee | Kihwal Lee
HADOOP-8269 | Fix some javadoc warnings on branch-1 | Trivial | documentation | Eli Collins | Eli Collins
MAPREDUCE-3674 | If invoked with no queueName request param, jobqueue_details.jsp injects a null queue name into schedulers. | Critical | jobtracker | Harsh J | Harsh J
MAPREDUCE-4088 | Task stuck in JobLocalizer prevented other tasks on the same node from committing | Critical | mrv1 | Ravi Prakash | Ravi Prakash
MAPREDUCE-4241 | Pipes examples do not compile on Ubuntu 12.04 | Major | build, examples | Andrew Bayer | Andrew Bayer
HDFS-3330 | If GetImageServlet throws an Error or RTE, response has HTTP “OK” status | Critical | namenode | Todd Lipcon | Todd Lipcon
HADOOP-8329 | Build fails with Java 7 | Major | build | Kumar Ravi | Eli Collins
HDFS-3453 | HDFS does not use ClientProtocol in a backward-compatible way | Major | hdfs-client | Kihwal Lee | Kihwal Lee
HADOOP-8445 | Token should not print the password in toString | Major | security | Ravi Prakash | Ravi Prakash
MAPREDUCE-2377 | task-controller fails to parse configuration if it doesn’t end in \n | Major | task-controller | Todd Lipcon | Benoy Antony
HDFS-3518 | Provide API to check HDFS operational state | Major | hdfs-client | Bikas Saha | Tsz Wo Nicholas Sze
HDFS-3551 | WebHDFS CREATE does not use client location for redirection | Major | webhdfs | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze
HADOOP-6527 | UserGroupInformation::createUserForTesting clobbers already defined group mappings | Major | security | Jakob Homan | Ivan Mitic
MAPREDUCE-2129 | Job may hang if mapreduce.job.committer.setup.cleanup.needed=false and mapreduce.map/reduce.failures.maxpercent>0 | Major | jobtracker | Kang Xiao | Subroto Sanyal
HADOOP-8417 | HADOOP-6963 didn’t update hadoop-core-pom-template.xml | Major | . | Ted Yu | Ted Yu
HADOOP-8399 | Remove JDK5 dependency from Hadoop 1.0+ line | Major | build | Konstantin Boudnik | Konstantin Boudnik
MAPREDUCE-2903 | Map Tasks graph is throwing XML Parse error when Job is executed with 0 maps | Major | jobtracker | Devaraj K | Devaraj K
HADOOP-8617 | backport pure Java CRC32 calculator changes to branch-1 | Major | performance | Brandon Li | Brandon Li
MAPREDUCE-4400 | Fix performance regression for small jobs/workflows | Major | performance, task | Luke Lu | Luke Lu
HDFS-3696 | Create files with WebHdfsFileSystem goes OOM when file size is big | Critical | webhdfs | Kihwal Lee | Tsz Wo Nicholas Sze
MAPREDUCE-4558 | TestJobTrackerSafeMode is failing | Major | . | Siddharth Seth | Siddharth Seth
HDFS-3466 | The SPNEGO filter for the NameNode should come out of the web keytab file | Major | namenode, security | Owen O’Malley | Owen O’Malley
HDFS-3966 | For branch-1, TestFileCreation should use JUnit4 to make assumeTrue work | Minor | . | Jing Zhao | Jing Zhao
HDFS-3698 | TestHftpFileSystem is failing in branch-1 due to changed default secure port | Major | security | Aaron T. Myers | Aaron T. Myers
MAPREDUCE-4673 | make TestRawHistoryFile and TestJobHistoryServer more robust | Major | test | Arpit Gupta | Arpit Gupta
MAPREDUCE-4675 | TestKillSubProcesses fails as the process is still alive after the job is done | Major | test | Arpit Gupta | Bikas Saha
HDFS-3701 | HDFS may miss the final block when reading a file opened for writing if one of the datanode is dead | Critical | hdfs-client | Nicolas Liochon | Nicolas Liochon
MAPREDUCE-4698 | TestJobHistoryConfig throws Exception in testJobHistoryLogging | Minor | . | Gopal V | Gopal V
HDFS-3461 | HFTP should use the same port & protocol for getting the delegation token | Major | . | Owen O’Malley | Owen O’Malley

### TESTS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
MAPREDUCE-2073 | TestTrackerDistributedCacheManager should be up-front about requirements on build environment | Trivial | distributed-cache, test | Todd Lipcon | Todd Lipcon
HDFS-2332 | Add test for HADOOP-7629: using an immutable FsPermission as an IPC parameter | Major | test | Todd Lipcon | Todd Lipcon
HDFS-3129 | NetworkTopology: add test that getLeaf should check for invalid topologies | Minor | . | Colin P. McCabe | Colin P. McCabe
HADOOP-7942 | enabling clover coverage reports fails hadoop unit test compilation | Major | . | Giridharan Kesavan | Jitendra Nath Pandey

### SUB-TASKS:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
MAPREDUCE-3008 | [Gridmix] Improve cumulative CPU usage emulation for short running tasks | Major | contrib/gridmix | Amar Kamat | Amar Kamat
MAPREDUCE-2957 | The TT should not re-init if it has no good local dirs | Major | tasktracker | Eli Collins | Eli Collins
HADOOP-7753 | Support fadvise and sync_data_range in NativeIO, add ReadaheadPool class | Major | io, native, performance | Todd Lipcon | Todd Lipcon
MAPREDUCE-2850 | Add test for TaskTracker disk failure handling (MR-2413) | Major | tasktracker | Eli Collins | Ravi Gummadi
MAPREDUCE-3015 | Add local dir failure info to metrics and the web UI | Major | tasktracker | Eli Collins | Eli Collins
MAPREDUCE-3424 | Some LinuxTaskController cleanup | Minor | tasktracker | Eli Collins | Eli Collins

### OTHER:

JIRA | Summary | Priority | Component | Reporter | Contributor
--- | --- | --- | --- | --- | ---
MAPREDUCE-2517 | Porting Gridmix v3 system tests into trunk branch. | Major | contrib/gridmix | Vinay Kumar Thota | Vinay Kumar Thota