Hadoop MapReduce Change Log

Trunk (unreleased changes)

  INCOMPATIBLE CHANGES

  NEW FEATURES

    MAPREDUCE-1017. Compression and output splitting for Sqoop.
    (Aaron Kimball via tomwhite)

  IMPROVEMENTS

    MAPREDUCE-707. Provide a jobconf property for explicitly assigning a job to 
    a pool in the Fair Scheduler. (Alan Heirich via matei)

    MAPREDUCE-999. Improve Sqoop test speed and refactor tests.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-906. Update Sqoop documentation. (Aaron Kimball via cdouglas)

    MAPREDUCE-947. Added commitJob and abortJob apis to OutputCommitter.
    Enhanced FileOutputCommitter to create a _SUCCESS file for successful
    jobs. (Amar Kamat & Jothi Padmanabhan via acmurthy) 

    MAPREDUCE-1103. Added more metrics to Jobtracker. (sharad) 

    MAPREDUCE-1048. Add occupied/reserved slot usage summary on jobtracker UI.
    (Amareshwari Sriramadasu and Hemanth Yamijala via sharad)

    MAPREDUCE-1090. Modified log statement in TaskMemoryManagerThread to
    include task attempt id. (yhemanth)

    MAPREDUCE-1069. Implement Sqoop API refactoring. (Aaron Kimball via
    tomwhite)

    MAPREDUCE-1036. Document Sqoop API. (Aaron Kimball via cdouglas)

  OPTIMIZATIONS

    MAPREDUCE-270. Fix the tasktracker to optionally send an out-of-band
    heartbeat on task-completion for better job-latency. (acmurthy) 
    Configuration changes:
      add mapreduce.tasktracker.outofband.heartbeat 

  BUG FIXES

    MAPREDUCE-1089. Fix NPE in fair scheduler preemption when tasks are
    scheduled but not running. (Todd Lipcon via matei)

    MAPREDUCE-1014. Fix the libraries for common and hdfs. (omalley)

    MAPREDUCE-1111. JT Jetty UI not working if we run mumak.sh 
    off packaged distribution directory. (hong tang via mahadev)

    MAPREDUCE-1133. Eclipse .classpath template has outdated jar files and is
    missing some new ones. (cos)

    MAPREDUCE-1098. Fixed the distributed-cache to not do i/o while holding a
    global lock. (Amareshwari Sriramadasu via acmurthy)

    MAPREDUCE-1158. Fix JT running maps and running reduces metrics.
    (sharad)

    MAPREDUCE-1160. Reduce verbosity of log lines in some Map/Reduce classes
    to avoid filling up jobtracker logs on a busy cluster.
    (Ravi Gummadi and Hong Tang via yhemanth)

    MAPREDUCE-1153. Fix tasktracker metrics when trackers are decommissioned.
    (sharad)

    MAPREDUCE-1128. Fix MRUnit to prohibit iterating over values twice. (Aaron
    Kimball via cdouglas)

    MAPREDUCE-665. Move libhdfs to HDFS subproject. (Eli Collins via dhruba)

    MAPREDUCE-1196. Fix FileOutputCommitter to use the deprecated cleanupJob
    api correctly. (acmurthy)

Release 0.21.0 - Unreleased

  INCOMPATIBLE CHANGES

    MAPREDUCE-516. Fix the starvation problem in the Capacity Scheduler 
    when running High RAM Jobs. (Arun Murthy via yhemanth)

    MAPREDUCE-358. Change org.apache.hadoop.examples. AggregateWordCount 
    and org.apache.hadoop.examples.AggregateWordHistogram to use new 
    mapreduce api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-245. Change Job and jobcontrol classes to use the List interface
    rather than ArrayList in APIs. (Tom White via cdouglas)

    MAPREDUCE-766. Enhanced list-blacklisted-trackers to display reasons
    for blacklisting a node. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-817. Add a cache for retired jobs with minimal job info and 
    provide a way to access history file url. (sharad)

    MAPREDUCE-711. Moved Distributed Cache from Common to Map/Reduce
    project. (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-895. Per the contract elucidated in HADOOP-6201, throw
    FileNotFoundException from FileSystem::listStatus rather than returning
    null. (Jakob Homan via cdouglas)

    MAPREDUCE-479. Provide full task id to map output servlet rather than the
    reduce id, only. (Jiaqi Tan via cdouglas)

    MAPREDUCE-873. Simplify job recovery. Incomplete jobs are resubmitted on 
    jobtracker restart. Removes a public constructor in JobInProgress. (sharad)

    HADOOP-6230. Moved process tree and memory calculator related classes from
    Common to Map/Reduce. (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-157. Refactor job history APIs and change the history format to 
    JSON. (Jothi Padmanabhan via sharad)

    MAPREDUCE-849. Rename configuration properties. (Amareshwari Sriramadasu 
    via sharad)

  NEW FEATURES

    MAPREDUCE-706. Support for FIFO pools in the fair scheduler.
    (Matei Zaharia)

    MAPREDUCE-546. Provide sample fair scheduler config file in conf/ and use
    it by default if no other config file is specified. (Matei Zaharia)

    MAPREDUCE-551. Preemption support in the Fair Scheduler. (Matei Zaharia)

    HADOOP-5887. Sqoop should create tables in Hive metastore after importing
    to HDFS. (Aaron Kimball via tomwhite)

    MAPREDUCE-567. Add a new example MR that always fails. (Philip Zeyliger
    via tomwhite)

    MAPREDUCE-211. Provides ability to run a health check script on the
    tasktracker nodes and blacklist nodes if they are unhealthy.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-637. Add an example, distbbp, which able to compute the n th bit
    of Pi for some large n.  (szetszwo)

    MAPREDUCE-532. Provide a way to limit the number of used slots 
    per queue in the capacity scheduler.
    (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-467. Provide ability to collect statistics about total tasks 
    and succeeded tasks in different time windows. (sharad)

    MAPREDUCE-740. Log a job-summary at the end of a job, while allowing it
    to be configured to use a custom appender if desired. (acmurthy)

    MAPREDUCE-705. User-configurable quote and delimiter characters for Sqoop
    records and record reparsing. (Aaron Kimball via tomwhite)

    MAPREDUCE-814. Provide a way to configure completed job history files 
    to be on HDFS. (sharad)

    MAPREDUCE-800. MRUnit should support the new API. (Aaron Kimball via
    tomwhite)

    MAPREDUCE-798. MRUnit should be able to test a succession of MapReduce
    passes. (Aaron Kimball via tomwhite)

    MAPREDUCE-768. Provide an option to dump jobtracker configuration in JSON
    format to standard output. (V.V.Chaitanya Krishna via yhemanth)

    MAPREDUCE-824. Add support for a hierarchy of queues in the capacity 
    scheduler. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-751. Add Rumen, a tool for extracting statistics from job tracker
    logs and generating job traces for simulation and analysis. (Dick King via
    cdouglas)

    MAPREDUCE-938. Postgresql support for Sqoop. (Aaron Kimball via tomwhite)	

    MAPREDUCE-830. Add support for splittable compression to TextInputFormats.
    (Abdul Qadeer via cdouglas)

    MAPREDUCE-861. Add support for hierarchical queues in the Map/Reduce
    framework. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-776. Add Gridmix, a benchmark processing Rumen traces to simulate
    a measured mix of jobs on a cluster. (cdouglas)

    MAPREDUCE-862. Enhance JobTracker UI to display hierarchical queues.
    (V.V.Chaitanya Krishna via yhemanth)

    MAPREDUCE-777. Brand new apis to track and query jobs as a
    replacement for JobClient. (Amareshwari Sriramadasu via acmurthy)

    MAPREDUCE-775. Add native and streaming support for Vertica as an input
    or output format taking advantage of parallel read and write properties of 
    the DBMS. (Omer Trajman via ddas)

    MAPREDUCE-679. XML-based metrics as JSP servlet for JobTracker.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-980. Modify JobHistory to use Avro for serialization. (cutting)

    MAPREDUCE-728. Add Mumak, a Hadoop map/reduce simulator. (Arun C Murthy,
    Tamas Sarlos, Anirban Dasgupta, Guanying Wang, and Hong Tang via cdouglas)

  IMPROVEMENTS

    MAPREDUCE-816. Rename "local" mysql import to "direct" in Sqoop.
    (Aaron Kimball via matei)

    HADOOP-5967. Sqoop should only use a single map task. (Aaron Kimball via
    tomwhite)

    HADOOP-5968. Sqoop should only print a warning about mysql import speed
    once. (Aaron Kimball via tomwhite)

    MAPREDUCE-463. Makes job setup and cleanup tasks as optional.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-502. Allow jobtracker to be configured with zero completed jobs
    in memory. (Amar Kamat via sharad)

    MAPREDUCE-416. Moves the history file to a "done" folder whenever a job 
    completes. (Amar Kamat via ddas)

    MAPREDUCE-646. Increase srcfilelist replication number in dictcp job.
    (Ravi Gummadi via szetszwo)
   
    HADOOP-6106. Updated hadoop-core and test jars from hudson trunk 
    build #12. (Giridharan Kesavan)

    MAPREDUCE-642. A option to distcp that allows preserving the full
    source path of a file in the specified destination directory.
    (Rodrigo Schmidt via dhruba)

    MAPREDUCE-686. Move TestSpeculativeExecution.Fake* into a separate class
    so that it can be used by other tests. (Jothi Padmanabhan via sharad)

    MAPREDUCE-625. Modify TestTaskLimits to improve execution time.
    (Jothi Padmanabhan via sharad)

    MAPREDUCE-465. Deprecate o.a.h.mapred.lib.MultithreadedMapRunner and add
    test for o.a.h.mapreduce.lib.MultithreadedMapper.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-692. Make Hudson run Sqoop unit tests.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-701. Improves the runtime of the TestRackAwareTaskPlacement
    by making it a unit test.  (Jothi Padmanabhan via ddas)

    MAPREDUCE-674. Sqoop should allow a "where" clause to avoid having to
    export entire tables. (Kevin Weil via tomwhite)

    MAPREDUCE-675. Sqoop should allow user-defined class and package names.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-371. Change KeyFieldBasedComparator and KeyFieldBasedPartitioner
    to use new api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-713. Sqoop has some superfluous imports. (Aaron Kimball via
    tomwhite)

    MAPREDUCE-623. Resolve javac warnings in mapreduce. (Jothi Padmanabhan
    via sharad)

    MAPREDUCE-655. Change KeyValueLineRecordReader and KeyValueTextInputFormat
    to use new mapreduce api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-632. Merge TestCustomOutputCommitter with 
    TestCommandLineJobSubmission. (Jothi Padmanabhan via sharad)

    MAPREDUCE-710. Sqoop should read and transmit passwords in a more secure
    manner. (Aaron Kimball via tomwhite)

    MAPREDUCE-627. Improves execution time of TestTrackerBlacklistAcrossJobs.
    (Jothi Padmanabhan via ddas)

    MAPREDUCE-630. Improves execution time of TestKillCompletedJob.
    (Jothi Padmanabhan via ddas)

    MAPREDUCE-626. Improves the execution time of TestLostTracker.
    (Jothi Padmanabhan via ddas)

    MAPREDUCE-353. Makes the shuffle read and connection timeouts
    configurable. (Ravi Gummadi via ddas)

    MAPREDUCE-739. Allow relative paths to be created in archives. (Mahadev
    Konar via cdouglas)

    MAPREDUCE-772. Merge HADOOP-4010 changes to LineRecordReader into mapreduce
    package. (Abdul Qadeer via cdouglas)

    MAPREDUCE-785. Separate sub-test of TestReduceFetch to be included in
    MR-670. (Jothi Padmanabhan via cdouglas)

    MAPREDUCE-784. Modify TestUserDefinedCounters to use LocalJobRunner 
    instead of MiniMR. (Jothi Padmanabhan via sharad)

    HADOOP-6160. Fix releaseaudit target to run on specific directories. 
    (gkesavan)

    MAPREDUCE-782. Use PureJavaCrc32 in SpillRecord.  (Todd Lipcon via
    szetszwo)

    MAPREDUCE-369. Change org.apache.hadoop.mapred.lib.MultipleInputs to 
    use new api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-373. Change org.apache.hadoop.mapred.lib.FieldSelectionMapReduce
    to use new api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-628. Improves the execution time of TestJobInProgress.
    (Jothi Padmanabhan via ddas)

    MAPREDUCE-793. Creates a new test that consolidates a few tests to
    include in the commit-test list. (Jothi Padmanabhan via ddas)
    
    MAPREDUCE-797. Adds combiner support to MRUnit MapReduceDriver.
    (Aaron Kimball via johan)    

    MAPREDUCE-656. Change org.apache.hadoop.mapred.SequenceFile* classes
    to use new mapreduce api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-670. Creates ant target for 10 mins patch test build.
    (Jothi Padmanabhan via gkesavan)

    MAPREDUCE-375. Change org.apache.hadoop.mapred.lib.NLineInputFormat 
    and org.apache.hadoop.mapred.MapFileOutputFormat to use new api.
    (Amareshwari Sriramadasu via ddas)

    MAPREDUCE-779. Added node health failure counts into 
    JobTrackerStatistics. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-789. Oracle support for Sqoop. (Aaron Kimball via tomwhite)

    MAPREDUCE-842. Setup secure permissions for localized job files,
    intermediate outputs and log files on tasktrackers.
    (Vinod Kumar Vavilapalli via yhemanth)
    
    MAPREDUCE-478. Allow map and reduce jvm parameters, environment variables
    and ulimit to be set separately.
    Configuration changes:
      add mapred.map.child.java.opts
      add mapred.reduce.child.java.opts
      add mapred.map.child.env
      add mapred.reduce.child.ulimit
      add mapred.map.child.env
      add mapred.reduce.child.ulimit
      deprecated mapred.child.java.opts
      deprecated mapred.child.env
      deprecated mapred.child.ulimit
    (acmurthy)

    MAPREDUCE-767. Remove the dependence on the CLI 2.0 snapshot.
    (Amar Kamat via omalley)

    MAPREDUCE-712. Minor efficiency tweaks to RandomTextWriter. (cdouglas)

    MAPREDUCE-870. Remove the job retire thread and the associated 
    config parameters. (sharad)

    MAPREDUCE-749. Make Sqoop unit tests more Hudson-friendly.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-874. Rename the PiEstimator example to QuasiMonteCarlo.
    (szetszwo)

    MAPREDUCE-336. Allow logging level of map/reduce tasks to be configurable. 
    Configuration changes:
      add mapred.map.child.log.level 
      add mapred.reduce.child.log.level 
    (acmurthy)

    MAPREDUCE-355. Update mapred.join package to use the new API. (Amareshwari
    Sriramadasu via cdouglas)

    HADOOP-6184. Updated hadoop common and test jars to get the new API
    in Configuration for dumping in JSON format from Hudson trunk build #68.
    (yhemanth)

    MAPREDUCE-476. Extend DistributedCache to work locally (LocalJobRunner).
    (Philip Zeyliger via tomwhite)

    MAPREDUCE-750. Extensible ConnManager factory API. (Aaron Kimball via
    tomwhite)

    MAPREDUCE-825. JobClient completion poll interval of 5s causes slow tests
    in local mode. (Aaron Kimball via tomwhite)

    MAPREDUCE-910. Support counters in MRUnit. (Aaron Kimball via cdouglas)

    MAPREDUCE-788. Update gridmix2 to use the new API (Amareshwari Sriramadasu
    via cdouglas)

    MAPREDUCE-875. Make DBRecordReader execute queries lazily. (Aaron Kimball 
    via enis)

    MAPREDUCE-318. Modularizes the shuffle code. (Jothi Padmanabhan and 
    Arun Murthy via ddas)

    MAPREDUCE-936. Allow a load difference for fairshare scheduler.
    (Zheng Shao via dhruba)

    MAPREDUCE-370. Update MultipleOutputs to use the API, merge funcitonality
    of MultipleOutputFormat. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-898. Changes DistributedCache to use the new API.
    (Amareshwari Sriramadasu via ddas)

    MAPREDUCE-876. Sqoop import of large tables can time out.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-918. Test hsqldb server should be memory-only.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-144. Includes dump of the process tree in task diagnostics when 
    a task is killed due to exceeding memory limits.
    (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-945. Modifies MRBench and TestMapRed to use ToolRunner so that
    options such as queue name can be passed via command line.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-963. Deprecate o.a.h.mapred.FileAlreadyExistsException and
    replace it with o.a.h.fs.FileAlreadyExistsException.  (Boris Shkolnik
    via szetszwo)

    MAPREDUCE-960. Remove an unnecessary intermediate copy and obsolete API
    from KeyValueLineRecordReader. (cdouglas)

    MAPREDUCE-930. Modify Rumen to resolve paths in the canonical way, rather
    than defaulting to the local filesystem. (cdouglas)

    MAPREDUCE-944. Extend the LoadManager API of the fair-share scheduler
    to support regulating tasks for a job based on resources currently in use
    by that job. (dhruba)

    MAPREDUCE-973. Move FailJob and SleepJob from examples to test. (cdouglas 
    via omalley)

    MAPREDUCE-966. Modify Rumen to clean up interfaces and simplify integration
    with other tools. (Hong Tang via cdouglas)

    MAPREDUCE-856. Setup secure permissions for distributed cache files.
    (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-885. More efficient SQL queries for DBInputFormat. (Aaron Kimball 
    via enis)

    MAPREDUCE-284. Enables ipc.client.tcpnodelay in Tasktracker's Child.
    (Ravi Gummadi via sharad)

    MAPREDUCE-907. Sqoop should use more intelligent splits. (Aaron Kimball
    via tomwhite)

    MAPREDUCE-916. Split the documentation to match the project split.
    (Corinne Chandel via omalley)

    MAPREDUCE-649. Validate a copy by comparing the source and destination
    checksums in distcp. Also adds an intra-task retry mechanism for errors
    detected during the copy. (Ravi Gummadi via cdouglas)

    MAPREDUCE-654. Add a -dryrun option to distcp printing a summary of the
    file data to be copied, without actually performing the copy. (Ravi Gummadi
    via cdouglas)

    MAPREDUCE-664. Display the number of files deleted by distcp when the
    -delete option is specified. (Ravi Gummadi via cdouglas)

    MAPREDUCE-781. Let the name of distcp jobs be configurable. (Venkatesh S
    via cdouglas)

    MAPREDUCE-975. Add an API in job client to get the history file url for 
    a given job id. (sharad)

    MAPREDUCE-905. Add Eclipse launch tasks for MapReduce. (Philip Zeyliger
    via tomwhite)

    MAPREDUCE-277. Makes job history counters available on the job history
    viewers. (Jothi Padmanabhan via ddas)

    MAPREDUCE-893. Provides an ability to refresh queue configuration
    without restarting the JobTracker.
    (Vinod Kumar Vavilapalli and Rahul Kumar Singh via yhemanth)

    MAPREDUCE-1011. Add build.properties to svn and git ignore. (omalley)

    MAPREDUCE-954. Change Map-Reduce context objects to be interfaces.
    (acmurthy) 

    MAPREDUCE-639. Change Terasort example to reflect the 2009 updates. 
    (omalley)

    HDFS-663. DFSIO for append. (shv)

    MAPREDUCE-1063. Document gridmix benchmark. (cdouglas)

    MAPREDUCE-931. Use built-in interpolation classes for making up task
    runtimes in Rumen. (Dick King via cdouglas)

    MAPREDUCE-1012. Mark Context interfaces as public evolving. (Tom White via
    cdouglas)

    MAPREDUCE-971. Document use of distcp when copying to s3, managing timeouts
    in particular. (Aaron Kimball via cdouglas)

  BUG FIXES

    MAPREDUCE-878. Rename fair scheduler design doc to 
    fair-scheduler-design-doc.tex and add Apache license header (matei)

    MAPREDUCE-703. Sqoop requires dependency on hsqldb in ivy.
    (Aaron Kimball via matei)

    HADOOP-4687. MapReduce is split from Hadoop Core. It is a subproject under 
    Hadoop (Owen O'Malley)

    HADOOP-6096. Fix Eclipse project and classpath files following project
    split. (tomwhite)

    MAPREDUCE-419. Reconcile mapred.userlog.limit.kb defaults in configuration
    and code. (Philip Zeyliger via cdouglas)

    MAPREDUCE-2. Fixes a bug in KeyFieldBasedPartitioner in handling empty
    keys. (Amar Kamat via sharad)

    MAPREDUCE-130. Delete the jobconf copy from the log directory of the 
    JobTracker when the job is retired. (Amar Kamat via sharad)

    MAPREDUCE-657. Fix hardcoded filesystem problem in CompletedJobStatusStore.
    (Amar Kamat via sharad)

    MAPREDUCE-179. Update progress in new RecordReaders. (cdouglas)

    MAPREDUCE-658. Replace NPE in distcp with a meaningful error message when
    the source path does not exist. (Ravi Gummadi via cdouglas)

    MAPREDUCE-671. Update ignore list to include untracked, generated
    build artifacts and config files. (cdouglas)

    MAPREDUCE-433. Use more reliable counters in TestReduceFetch. (cdouglas)

    MAPREDUCE-124. Fix a bug in failure handling of abort task of 
    OutputCommiter. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-673. Sqoop depends on commons-cli, which is not in its ivy.xml.
    (Kevin Weil via tomwhite)

    MAPREDUCE-694. Fix to add jsp-api jars to capacity-scheduler classpath.
    (Giridharan Kesavan)

    MAPREDUCE-690. Sqoop's test "hive" script needs to be executable.
    (Aaron Kimball via tomwhite)
    
    MAPREDUCE-702. Fix eclipse-plugin jar target (Giridharan Kesavan) 

    MAPREDUCE-522. Replace TestQueueCapacities with simpler test case to
    test integration between capacity scheduler and MR framework.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-683. Fixes an initialization problem in the JobHistory. 
    The initialization of JobHistoryFilesManager is now done in the 
    JobHistory.init call. (Amar Kamat via ddas)

    MAPREDUCE-708. Fixes a bug to allow updating the reason for
    blacklisting a node on the JobTracker UI.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-709. Fixes message displayed for a blacklisted node where
    the reason for blacklisting is due to the health check script
    timing out. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-676. Existing diagnostic rules fail for MAP ONLY jobs.
    (Suhas Gogate via tomwhite)

    MAPREDUCE-722. Fixes a bug with tasktracker reservations for
    high memory jobs in capacity scheduler.
    (Vinod Kumar Vavilapalli via yhemanth)

    HADOOP-6090. Updates gridmix script to use new mapreduce api output 
    format. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-732. Removed spurious log statements in the node
    blacklisting logic. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-685. Sqoop will fail with OutOfMemory on large tables
    using mysql. (Aaron Kimball via tomwhite)

    MAPREDUCE-734. Fix a ConcurrentModificationException in unreserving
    unused reservations for a job when it completes.
    (Arun Murthy and Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-733. Fix a RuntimeException while unreserving trackers
    that are blacklisted for a job.
    (Arun Murthy and Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-677. Fix timeout in TestNodeRefresh. (Amar Kamat via 
    sharad)

    MAPREDUCE-153. Fix timeout in TestJobInProgressListener. (Amar 
    Kamat via sharad)

    MAPREDUCE-742. Fix output messages and java comments in the Pi related
    examples.  (szetszwo)

    MAPREDUCE-565. Fix partitioner to work with new API. (Owen O'Malley via
    cdouglas)
    
    MAPREDUCE-680. Fix so MRUnit can handle reuse of Writable objects.
    (Aaron Kimball via johan)

    MAPREDUCE-18. Puts some checks for cross checking whether a reduce
    task gets the correct shuffle data. (Ravi Gummadi via ddas)

    MAPREDUCE-771. Fix scheduling of setup and cleanup tasks to use
    free slots instead of tasks for scheduling. (yhemanth)

    MAPREDUCE-717. Fixes some corner case issues in speculative 
    execution heuristics. (Devaraj Das)

    MAPREDUCE-716. Make DBInputFormat work with Oracle. (Aaron Kimball
    via tomwhite)

    MAPREDUCE-735. Fixes a problem in the KeyFieldHelper to do with 
    the end index for some inputs (Amar Kamat via ddas)

    MAPREDUCE-682. Removes reservations on tasktrackers which are
    blacklisted. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-743. Fixes a problem to do with progress reporting
    in the map phase. (Ravi Gummadi via ddas)

    MAPREDUCE-765. Eliminate the deprecated warnings introduced by H-5438.
    (He Yongqiang via szetszwo)

    MAPREDUCE-383. Fix a bug in Pipes combiner due to bytes count not 
    getting reset after the spill. (Christian Kunz via sharad)

    MAPREDUCE-809. Fix job-summary logs to correctly record status of FAILED
    and KILLED jobs.  (acmurthy)

    MAPREDUCE-792. Fix unchecked warnings in DBInputFormat.  (Aaron Kimball
    via szetszwo)

    MAPREDUCE-760. Fix a timing issue in TestNodeRefresh. (Amar Kamat via 
    sharad)

    MAPREDUCE-40. Keep memory management backwards compatible for job
    configuration parameters and limits. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-587. Fixes a OOM issue in TestStreamingExitStatus.
    (Amar Kamat via ddas) 

    MAPREDUCE-408. Fixes an assertion problem in TestKillSubProcesses
    (Ravi Gummadi via ddas)
     
    MAPREDUCE-659. Fix gridmix2 compilation. (Giridharan Kesavan)

    MAPREDUCE-796. Fixes a ClassCastException in an exception log in
    MultiThreadedMapRunner. (Amar Kamat via ddas)

    MAPREDUCE-808. Fixes a serialization problem in TypedBytes.
    (Klaas Bosteels via ddas)

    MAPREDUCE-845. Fix a findbugs heap size problem in build.xml and add
    a new property findbugs.heap.size.  (Lee Tucker via szetszwo)

    MAPREDUCE-838. Fixes a problem in the way commit of task outputs
    happens. The bug was that even if commit failed, the task would
    be declared as successful. (Amareshwari Sriramadasu via ddas)

    MAPREDUCE-813. Updates Streaming and M/R tutorial documents.
    (Corinne Chandel via ddas)

    MAPREDUCE-805. Fixes some deadlocks in the JobTracker due to the fact
    the JobTracker lock hierarchy wasn't maintained in some JobInProgress
    method calls. (Amar Kamat via ddas)
    
    MAPREDUCE-799. Fixes so all of the MRUnit self-tests run.
    (Aaron Kimball via johan)    

    MAPREDUCE-848. Fixes a problem to do with TestCapacityScheduler
    failing (Amar Kamat via ddas)

    MAPREDUCE-840. DBInputFormat leaves open transaction.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-859. Adds Avro and its dependencies required by Hadoop 
    common. (Ravi Gummadi via sharad)
    
    MAPREDUCE-867. Fix ivy conf to look for avro jar from maven repo.	
    (Giridharan Kesavan)

    MAPREDUCE-877. Added avro as a dependency to contrib ivy settings.
    (Tsz Wo (Nicholas) Sze via yhemanth)

    MAPREDUCE-852. In build.xml, remove the Main-Class, which is incorrectly
    set in tools, and rename the target "tools-jar" to "tools".  (szetszwo)

    MAPREDUCE-773. Sends progress reports for compressed gzip inputs in maps.
    Fixes a native direct buffer leak in LineRecordReader classes.
    (Hong Tang and ddas)

    MAPREDUCE-832. Reduce number of warning messages printed when
    deprecated memory variables are used. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-745. Fixes a testcase problem to do with generation of JobTracker
    IDs. (Amar Kamat via ddas)

    MAPREDUCE-834. Enables memory management on tasktrackers when old
    memory management parameters are used in configuration.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-818. Fixes Counters#getGroup API. (Amareshwari Sriramadasu 
    via sharad)

    MAPREDUCE-807. Handles the AccessControlException during the deletion of
    mapred.system.dir in the JobTracker. The JobTracker will bail out if it
    encounters such an exception. (Amar Kamat via ddas)

    MAPREDUCE-430. Fix a bug related to task getting stuck in case of 
    OOM error. (Amar Kamat via ddas)

    MAPREDUCE-871. Fix ownership of Job/Task local files to have correct 
    group ownership according to the egid of the tasktracker.
    (Vinod Kumar Vavilapalli via yhemanth) 

    MAPREDUCE-911. Fix a bug in TestTaskFail related to speculative 
    execution. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-687. Fix an assertion in TestMiniMRMapRedDebugScript.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-924. Fixes the TestPipes testcase to use Tool.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-903. Add Avro jar to eclipse classpath.
    (Philip Zeyliger via tomwhite)

    MAPREDUCE-943. Removes a testcase in TestNodeRefresh that doesn't make 
    sense in the new Job recovery model. (Amar Kamat via ddas)

    MAPREDUCE-764. TypedBytesInput's readRaw() does not preserve custom type
    codes. (Klaas Bosteels via tomwhite)

    HADOOP-6243. Fixes a NullPointerException in handling deprecated keys.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-968. NPE in distcp encountered when placing _logs directory on
    S3FileSystem. (Aaron Kimball via tomwhite)
 
    MAPREDUCE-826. harchive doesn't use ToolRunner / harchive returns 0 even
    if the job fails with exception (koji Noguchi via mahadev)

    MAPREDUCE-839. unit test TestMiniMRChildTask fails on mac os-x (hong tang
    via mahadev)

    MAPREDUCE-112. Add counters for reduce input, output records to the new API.
    (Jothi Padmanabhan via cdouglas)

    MAPREDUCE-648. Fix two distcp bugs: (1) it should not launch a job if all
    src paths are directories, and (2) it does not skip copying when updating
    a single file.  (Ravi Gummadi via szetszwo)

    MAPREDUCE-946. Fix a regression in LineRecordReader where the
    maxBytesToConsume parameter is not set correctly. (cdouglas)

    MAPREDUCE-977. Missing jackson jars from Eclipse template. (tomwhite)

    MAPREDUCE-988. Fix a packaging issue in the contrib modules. (Hong Tang via
    cdouglas)

    MAPREDUCE-971. distcp does not always remove distcp.tmp.dir. (Aaron Kimball
    via tomwhite)

    MAPREDUCE-995. Fix a bug in JobHistory where tasks completing after the job
    is closed cause a NPE. (Jothi Padmanabhan via cdouglas)

    MAPREDUCE-953. Fix QueueManager to dump queue configuration in JSON format.
    (V.V. Chaitanya Krishna via yhemanth)

    MAPREDUCE-645. Prevent distcp from running a job when the destination is a
    file, but the source is not. (Ravi Gummadi via cdouglas)

    MAPREDUCE-1002. Flushed writer in JobQueueClient so queue information is
    printed correctly. (V.V. Chaitanya Krishna via yhemanth)

    MAPREDUCE-1003. Fix compilation problem in eclipse plugin when
    eclipse.home is set. (Ravi Gummadi via yhemanth)

    MAPREDUCE-941. Vaidya script fails on Solaris. (Chad Metcalf
    via tomwhite)

    MAPREDUCE-923. Sqoop classpath breaks for jar files with a
    plus sign in their names. (Aaron Kimball via tomwhite)

    MAPREDUCE-912. Add and standardize Apache license headers. (Chad Metcalf
    via cdouglas)

    MAPREDUCE-1022. Fix compilation of vertica testcases. (Vinod Kumar 
    Vavilapalli via acmurthy)

    MAPREDUCE-1000. Handle corrupt history files in JobHistory.initDone().
    (Jothi Padmanabhan via sharad)

    MAPREDUCE-1028. Fixed number of slots occupied by cleanup tasks to one
    irrespective of slot size for the job.
    (Ravi Gummadi via yhemanth)

    MAPREDUCE-964. Fixed start and finish times of TaskStatus to be
    consistent, thereby fixing inconsistencies in metering tasks.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-1076. Deprecate ClusterStatus and add javadoc in ClusterMetrics.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-979. Fixed JobConf APIs related to memory parameters to return
    values of new configuration variables when deprecated variables are
    disabled. (Sreekanth Ramakrishnan via yhemanth)
   
    MAPREDUCE-1030. Modified scheduling algorithm to return a map and reduce
    task per heartbeat in the capacity scheduler.
    (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-1071. Use DataInputStream rather than FSDataInputStream in the
    JobHistory EventReader. (Hong Tang via cdouglas)

    MAPREDUCE-986. Fix Rumen to work with truncated task lines. (Dick King via
    cdouglas)

    MAPREDUCE-1029. Fix failing TestCopyFiles by restoring the unzipping of
    HDFS webapps from the hdfs jar. (Aaron Kimball and Jothi Padmanabhan via
    cdouglas)

    MAPREDUCE-769. Make findbugs and javac warnings to zero.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-1104. Initialize RecoveryManager in JobTracker cstr called by
    Mumak. (Hong Tang via cdouglas)

    MAPREDUCE-1061. Add unit test validating byte specifications for gridmix
    jobs. (cdouglas)

    MAPREDUCE-1077. Fix Rumen so that truncated tasks do not mark the job as
    successful. (Dick King via cdouglas)

    MAPREDUCE-1041. Make TaskInProgress::taskStatuses map package-private.
    (Jothi Padmanabhan via cdouglas)

    MAPREDUCE-1070. Prevent a deadlock in the fair scheduler servlet.
    (Todd Lipcon via cdouglas)

    MAPREDUCE-1086. Setup Hadoop logging environment for tasks to point to
    task related parameters. (Ravi Gummadi via yhemanth)

    MAPREDUCE-1105. Remove max limit configuration in capacity scheduler in
    favor of max capacity percentage thus allowing the limit to go over
    queue capacity. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-1016.  Make the job history log format JSON.  (cutting)

    MAPREDUCE-1038. Weave Mumak aspects only if related files have changed.
    (Aaron Kimball via cdouglas)

    MAPREDUCE-1037. Continue running contrib tests if Sqoop tests fail. (Aaron
    Kimball via cdouglas)

    MAPREDUCE-1163. Remove unused, hard-coded paths from libhdfs. (Allen
    Wittenauer via cdouglas)

    MAPREDUCE-962. Fix a NullPointerException while killing task process 
    trees. (Ravi Gummadi via yhemanth)

    MAPREDUCE-1177. Correct setup/cleanup inversion in
    JobTracker::getTaskReports. (Vinod Kumar Vavilapalli via cdouglas)

    MAPREDUCE-1178. Fix ClassCastException in MultipleInputs by adding 
    a DelegatingRecordReader. (Amareshwari Sriramadasu and Jay Booth 
    via sharad)

    MAPREDUCE-1068. Fix streaming job to show proper message if file is 
    is not present. (Amareshwari Sriramadasu via sharad)