hadoop/hadoop-yarn-project/CHANGES.txt

Hadoop YARN Change Log

Release 2.1.1-beta - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

Release 2.1.0-beta - 2013-07-02

  INCOMPATIBLE CHANGES

    YARN-396. Rationalize AllocateResponse in RM Scheduler API. (Zhijie Shen
    via hitesh)

    YARN-439. Flatten NodeHeartbeatResponse. (Xuan Gong via sseth)

    YARN-440. Flatten RegisterNodeManagerResponse. (Xuan Gong via sseth)

    YARN-536. Removed the unused objects ContainerStatus and ContainerStatus from
    Container which also don't belong to the container. (Xuan Gong via vinodkv)

    YARN-486. Changed NM's startContainer API to accept Container record given by
    RM as a direct parameter instead of as part of the ContainerLaunchContext
    record. (Xuan Gong via vinodkv)

    YARN-444. Moved special container exit codes from YarnConfiguration to API
    where they belong. (Sandy Ryza via vinodkv)

    YARN-441. Removed unused utility methods for collections from two API
    records. (Xuan Gong via vinodkv)

    YARN-561. Modified NodeManager to set key information into the environment
    of every container that it launches. (Xuan Gong via vinodkv)

    YARN-579. Stop setting the Application Token in the AppMaster env, in
    favour of the copy present in the container token field. 
    (Vinod Kumar Vavilapalli via sseth)

    YARN-629. Make YarnRemoteException not be rooted at IOException. (Xuan Gong
    via vinodkv)

    YARN-633. Changed RMAdminProtocol api to throw IOException and
    YarnRemoteException. (Xuan Gong via vinodkv)

    YARN-632. Changed ContainerManager api to throw IOException and
    YarnRemoteException. (Xuan Gong via vinodkv)

    YARN-631. Changed ClientRMProtocol api to throw IOException and
    YarnRemoteException. (Xuan Gong via vinodkv)

    YARN-630. Changed AMRMProtocol api to throw IOException and
    YarnRemoteException. (Xuan Gong via vinodkv)

    YARN-615. Rename ContainerLaunchContext.containerTokens to tokens.
    (Vinod Kumar Vavilapalli via sseth)

    YARN-571. Remove user from ContainerLaunchContext. (Omkar Vinit Joshi via
    vinodkv)

    YARN-716. Making ApplicationID immutable. (Siddharth Seth via vinodkv)

    YARN-684. ContainerManager.startContainer should use
    ContainerTokenIdentifier instead of the entire Container.
    (Vinod Kumar Vavilapalli via sseth)

    YARN-735. Make ApplicationAttemptId, ContaienrId and NodeId immutable.
    (Jian He via sseth)

    YARN-749. Rename ResourceRequest.(get,set)HostName to
    ResourceRequest.(get,set)ResourceName. (acmurthy)

    YARN-720. container-log4j.properties should not refer to mapreduce
    property names. (Zhijie Shen via sseth)

    YARN-748. Moved BuilderUtils from yarn-common to yarn-server-common for
    eventual retirement. (Jian He via vinodkv)

    YARN-635. Renamed YarnRemoteException to YarnException. (Siddharth Seth via
    vinodkv)

    YARN-755. Renamed AllocateResponse.reboot to AllocateResponse.resync. (Bikas
    Saha via vinodkv)

    YARN-753. Added individual factory methods for all api protocol records and
    converted the records to be abstract classes. (Jian He via vinodkv)

    YARN-724. Moved ProtoBase from api.records to api.records.impl.pb. (Jian He
    via vinodkv)

    YARN-759. Create Command enum in AllocateResponse (bikas)

    YARN-777. Removed unreferenced objects from .proto files. (Jian He via
    vinodkv) 

    YARN-642. Removed health parameter from ResourceManager /nodes web-service
    and cleaned the behaviour of the status parameter. (Sandy Ryza vid vinodkv)

    YARN-530. Defined Service model strictly, implemented AbstractService for
    robust subclassing and migrated yarn-common services. (Steve Loughran via
    vinodkv)

    YARN-746. Renamed Service.register() and Service.unregister() to
    registerServiceListener() & unregisterServiceListener() respectively.
    (Steve Loughran via vinodkv)

    YARN-792. Moved NodeHealthStatus from yarn.api.record to
    yarn.server.api.record. (Jian He via vinodkv)

    YARN-806. Moved ContainerExitStatus from yarn.api to yarn.api.records. (Jian
    He via vinodkv)

    YARN-821. Renamed setFinishApplicationStatus to setFinalApplicationStatus in
    FinishApplicationMasterRequest for consistency. (Jian He via vinodkv)

    YARN-787. Removed minimum resource from RegisterApplicationMasterResponse.
    (tucu via acmurthy)

    YARN-829. Renamed RMTokenSelector to be RMDelegationTokenSelector. (Zhijie
    Shen via vinodkv)

    YARN-828. Removed the unsed YarnVersionAnnotation. (Zhijie Shen via vinodkv)

    YARN-823. Moved RMAdmin from yarn.client to yarn.client.cli and renamed it to
    be RMAdminCLI. (Jian He via vinodkv)

    YARN-387. Renamed YARN protocols for consistency.
    ClientRMProtocol -> ApplicationClientProtocol
    AMRMProtocol -> ApplicationMasterProtocol
    ContainerManager -> ContainerManagementProtocol
    (vinodkv via acmurthy)

    YARN-831. Removed minimum resource from GetNewApplicationResponse as a
    follow-up to YARN-787. (Jian He via acmurthy)

    YARN-824. Added static factory methods to hadoop-yarn-client interfaces. 
    (Jian He via acmurthy)

    YARN-826. Moved Clock and SystemClock into yarn.util package. (Zhijie Shen
    via vinodkv)

    YARN-837. Moved yarn.ClusterInfo into MapReduce project as it doesn't belong
    to YARN. (Zhijie Shen via vinodkv)

    YARN-822. Renamed ApplicationToken to be AMRMToken, and similarly the
    corresponding TokenSelector and SecretManager. (Omkar Vinit Joshi via vinodkv)

    YARN-610. ClientToken is no longer set in the environment of the Containers.
    (Omkar Vinit Joshi via vinodkv)

    YARN-834. Fixed annotations for yarn-client module, reorganized packages and
    clearly differentiated *Async apis. (Arun C Murthy and Zhijie Shen via
    vinodkv)

    YARN-840. Moved ProtoUtils to yarn.api.records.pb.impl. (Jian He via
    acmurthy) 

    YARN-841. Move Auxiliary service to yarn-api, annotate and document it.
    (vinodkv)

    YARN-850. Rename getClusterAvailableResources to getAvailableResources in
    AMRMClients (Jian He via bikas)

    YARN-694. Starting to use NMTokens to authenticate all communication with
    NodeManagers. (Omkar Vinit Joshi via vinodkv) 

    YARN-553. Replaced YarnClient.getNewApplication with
    YarnClient.createApplication which provides a directly usable
    ApplicationSubmissionContext to simplify the api. (Karthik Kambatla via
    acmurthy) 

    YARN-851. Share NMTokens using NMTokenCache (api-based) between AMRMClient
    and NMClient instead of memory based approach which is used currently. (Omkar
    Vinit Joshi via vinodkv)

    YARN-869. Move ResourceManagerAdministrationProtocol out of main YARN api.
    (vinodkv via acmurthy)

    YARN-791. Changed RM APIs and web-services related to nodes to ensure that
    both are consistent with each other. (Sandy Ryza via vinodkv)

    YARN-727. ClientRMProtocol.getAllApplications should accept ApplicationType as
    a parameter. (Xuan Gong via hitesh)

    YARN-701. Use application tokens irrespective of secure or non-secure
    mode. (vinodkv via acmurthy)

    YARN-918. Remove ApplicationAttemptId from
    RegisterApplicationMasterRequestProto. (vinodkv via acmurthy)

    YARN-926. Modified ContainerManagerProtcol APIs to take in requests for
    multiple containers. (Jian He via vinodkv)

  NEW FEATURES

    YARN-482. FS: Extend SchedulingMode to intermediate queues. 
    (kkambatl via tucu)

    YARN-45. Add protocol for schedulers to request containers back from
    ApplicationMasters. (Carlo Curino, cdouglas)

    YARN-563. Add the concept of an application-type for each application.
    (Mayank Bansal via vinodkv)

    HADOOP-8562. Enhancements to support Hadoop on Windows Server and Windows
    Azure environments. (See breakdown of tasks below for subtasks and
    contributors)

    YARN-422. Add a NM Client library to help application-writers. (Zhijie Shen
    via vinodkv)

    YARN-392. Make it possible to specify hard locality constraints in resource
    requests. (sandyr via tucu)

    YARN-326. Add multi-resource scheduling to the fair scheduler. 
    (sandyr via tucu)

    YARN-398. Make it possible to specify hard locality constraints in resource
    requests for CapacityScheduler. (acmurthy)

    YARN-781. Exposing LOGDIR in all containers' environment which should be used
    by containers for logging purposes. (Jian He via vinodkv)

  IMPROVEMENTS

    YARN-347. Node CLI should show CPU info besides memory in node status.
    (Junping Du via llu)

    YARN-365. Change NM heartbeat handling to not generate a scheduler event
    on each heartbeat. (Xuan Gong via sseth)

    YARN-380. Fix yarn node -status output to be better readable. (Omkar Vinit
    Joshi via vinodkv)

    YARN-410. Fixed RM UI so that the new lines diagnostics for a failed app on
    the per-application page are translated to html line breaks. (Omkar Vinit
    Joshi via vinodkv)

    YARN-198. Added a link to RM pages from the NodeManager web app. (Jian He
    via vinodkv)

    YARN-237. Refreshing the RM page forgets how many rows I had in my
    Datatables (jian he via bobby)

    YARN-481. Add AM Host and RPC Port to ApplicationCLI Status Output 
    (Chris Riccomini via bikas)

    YARN-297. Improve hashCode implementations for PB records. (Xuan Gong via
    hitesh)

    YARN-417. Create AMRMClient wrapper that provides asynchronous callbacks.
    (Sandy Ryza via bikas)

    YARN-497. Yarn unmanaged-am launcher jar does not define a main class in
    its manifest (Hitesh Shah via bikas)

    YARN-469. Make scheduling mode in FS pluggable. (kkambatl via tucu)

    YARN-450. Define value for * in the scheduling protocol (Zhijie Shen via
    bikas)

    YARN-475. Remove a unused constant in the public API -
    ApplicationConstants.AM_APP_ATTEMPT_ID_ENV. (Hitesh Shah via vinodkv)

    YARN-309. Changed NodeManager to obtain heart-beat interval from the
    ResourceManager. (Xuan Gong via vinodkv)

    YARN-447. Move ApplicationComparator in CapacityScheduler to use comparator
    in ApplicationId. (Nemon Lou via vinodkv)

    YARN-381. Improve fair scheduler docs. (Sandy Ryza via tomwhite)

    YARN-458. YARN daemon addresses must be placed in many different configs. 
    (sandyr via tucu)

    YARN-193. Scheduler.normalizeRequest does not account for allocation
    requests that exceed maximumAllocation limits (Zhijie Shen via bikas)

    YARN-479. NM retry behavior for connection to RM should be similar for
    lost heartbeats (Jian He via bikas)

    YARN-495. Changed NM reboot behaviour to be a simple resync - kill all
    containers  and re-register with RM. (Jian He via vinodkv)

    YARN-514. Delayed store operations should not result in RM unavailability
    for app submission (Zhijie Shen via bikas)

    YARN-586. Fixed a typo in ApplicationSubmissionContext#setApplicationId.
    (Zhijie Shen via vinodkv)

    YARN-542. Changed the default global AM max-attempts value to be not one.
    (Zhijie Shen via vinodkv)

    YARN-583. Moved application level local resources to be localized under the
    filecache sub-directory under application directory. (Omkar Vinit Joshi via
    vinodkv)

    YARN-581. Added a test to verify that app delegation tokens are restored
    after RM restart. (Jian He via vinodkv)

    YARN-577. Add application-progress also to ApplicationReport. (Hitesh Shah
    via vinodkv)

    YARN-595. Refactor fair scheduler to use common Resources. (Sandy Ryza
    via tomwhite)

    YARN-562. Modified NM to reject any containers allocated by a previous
    ResourceManager. (Jian He via vinodkv)

    YARN-591. Moved RM recovery related records out of public API as they do not
    belong there. (vinodkv)

    YARN-599. Refactoring submitApplication in ClientRMService and RMAppManager
    to separate out various validation checks depending on whether they rely on
    RM configuration or not. (Zhijie Shen via vinodkv)

    YARN-618. Modified RM_INVALID_IDENTIFIER to be -1 instead of zero. (Jian He
    via vinodkv)

    YARN-625. Move the utility method unwrapAndThrowException from
    YarnRemoteExceptionPBImpl to RPCUtil. (Siddharth Seth via vinodkv)

    YARN-645. Moved RMDelegationTokenSecretManager from yarn-server-common to
    yarn-server-resourcemanager where it really belongs. (Jian He via vinodkv)

    YARN-651. Changed PBClientImpls of ContainerManager and RMAdmin to throw
    IOExceptions also. (Xuan Gong via vinodkv)

    YARN-582. Changed ResourceManager to recover Application token and client
    tokens for app attempt so that RM can be restarted while preserving current
    applications. (Jian He via vinodkv)

    YARN-568. Add support for work preserving preemption to the FairScheduler.
    (Carlo Curino and Sandy Ryza via cdouglas)

    YARN-598. Add virtual cores to queue metrics. (sandyr via tucu)

    YARN-634. Modified YarnRemoteException to be not backed by PB and introduced
    a separate SerializedException record. (Siddharth Seth via vinodkv)

    YARN-663. Changed ResourceTracker API and LocalizationProtocol API to throw
    YarnRemoteException and IOException. (Xuan Gong via vinodkv)

    YARN-590. Added an optional mesage to be returned by ResourceMaanger when RM
    asks an RM to shutdown/resync etc so that NMs can log this message locally
    for better debuggability. (Mayank Bansal via vinodkv)

    YARN-617. Made ContainerTokens to be used for validation at NodeManager
    also in unsecure mode to prevent AMs from faking resource requirements in
    unsecure mode. (Omkar Vinit Joshi via vinodkv)

    YARN-708. Moved RecordFactory classes to hadoop-yarn-api, and put some
    miscellaneous fixes to the interfaces. (Siddharth Seth via vinodkv)

    YARN-711. Copied BuilderUtil methods in individual API records as
    BuilderUtils is going to be dismantled. (Jian He via vinodkv)

    YARN-714. Added NMTokens to be sent to AMs as part of heart-beat response.
    (Omkar Vinit Joshi via vinodkv)

    YARN-638. Modified ResourceManager to restore RMDelegationTokens after
    restarting. (Jian He via vinodkv)

    YARN-660. Improve AMRMClient with matching requests (bikas)

    YARN-717. Put object creation factories for Token in the class itself and
    remove useless derivations for specific tokens. (Jian He via vinodkv)

    YARN-756. Move Preemption* records to yarn.api where they really belong.
    (Jian He via vinodkv)

    YARN-750. Allow for black-listing resources in YARN API and Impl in CS
    (acmurthy via bikas)

    YARN-877. Support resource blacklisting for FifoScheduler.
    (Junping Du via llu)

    YARN-686. Flatten NodeReport. (sandyr via tucu)

    YARN-737. Throw some specific exceptions directly instead of wrapping them
    in YarnException. (Jian He via sseth)

    YARN-731. RPCUtil.unwrapAndThrowException should unwrap remote
    RuntimeExceptions. (Zhijie Shen via sseth)

    YARN-600. Hook up cgroups CPU settings to the number of virtual cores 
    allocated. (sandyr via tucu)

    YARN-648. FS: Add documentation for pluggable policy. (kkambatl via tucu)

    YARN-773. Moved YarnRuntimeException from package api.yarn to
    api.yarn.exceptions. (Jian He via vinodkv)

    YARN-692. Creating NMToken master key on RM and sharing it with NM as a part
    of RM-NM heartbeat. (Omkar Vinit Joshi via vinodkv)

    YARN-782. vcores-pcores ratio functions differently from vmem-pmem ratio in 
    misleading way. (sandyr via tucu)

    YARN-803. factor out scheduler config validation from the ResourceManager 
    to each scheduler implementation. (tucu)

    YARN-789. Enable zero capabilities resource requests in fair scheduler. 
    (tucu)

    YARN-639. Modified Distributed Shell application to start using the new
    NMClient library. (Zhijie Shen via vinodkv)

    YARN-693. Modified RM to send NMTokens on allocate call so that AMs can then
    use them for authentication with NMs. (Omkar Vinit Joshi via vinodkv)

    YARN-752. In AMRMClient, automatically add corresponding rack requests for 
    requested nodes. (sandyr via tucu)

    YARN-825. Fixed javadoc and annotations for yarn-common module. (vinodkv)

    YARN-833. Moved Graph and VisualizeStateMachine into yarn.state package.
    (Zhijie Shen via vinodkv)

    YARN-805. Fix javadoc and annotations on classes in the yarn-api
    package. (Jian He via sseth)

    YARN-846.  Move pb Impl classes from yarn-api to yarn-common. (Jian He via
    vinodkv)

    YARN-827. Need to make Resource arithmetic methods accessible (Jian He via
    bikas)

    YARN-866. Add test for class ResourceWeights. (ywskycn via tucu)

    YARN-736. Add a multi-resource fair sharing metric. (sandyr via tucu)

    YARN-883. Expose Fair Scheduler-specific queue metrics. (sandyr via tucu)

    YARN-569. Add support for requesting and enforcing preemption requests via
    a capacity monitor. (Carlo Curino, cdouglas)

    YARN-521. Augment AM - RM client module to be able to request containers
    only at specific locations (Sandy Ryza via bikas)

    YARN-513. Create common proxy client for communicating with RM. (Xuan Gong
    & Jian He via bikas)

    YARN-927. Change ContainerRequest to not have more than 1 container count
    and remove StoreContainerRequest (bikas)

    YARN-922. Change FileSystemRMStateStore to use directories (Jian He via
    bikas)

    YARN-865. RM webservices can't query based on application Types. (Xuan Gong
    via hitesh)

    YARN-912. Move client facing exceptions to yarn-api module. (Mayank Bansal
    via vinodkv)

    YARN-84. Use Builder to build RPC server. (Brandon Li via szetszwo)

  OPTIMIZATIONS

    YARN-512. Log aggregation root directory check is more expensive than it
    needs to be. (Maysam Yabandeh via jlowe)

    YARN-719. Move RMIdentifier from Container to ContainerTokenIdentifier.
    (Vinod Kumar Vavilapalli via sseth)

  BUG FIXES

    YARN-383. AMRMClientImpl should handle null rmClient in stop()
    (Hitesh Shah via sseth)

    YARN-385. Add missing fields - location and #containers to
    ResourceRequestPBImpl's toString(). (Sandy Ryza via sseth)

    YARN-377. Use the new StringUtils methods added by HADOOP-9252 and fix
    TestContainersMonitor.  (Chris Nauroth via szetszwo)

    YARN-391. Formatting fixes for LCEResourceHandler classes.
    (Steve Loughran via sseth)

    YARN-390. ApplicationCLI and NodeCLI hard-coded platform-specific line
    separator causes test failures on Windows. (Chris Nauroth via suresh)

    YARN-406. Fix TestRackResolver to function in networks where "host1"
    resolves to a valid host. (Hitesh Shah via sseth)

    YARN-376. Fixes a bug which would prevent the NM knowing about completed
    containers and applications. (Jason Lowe via sseth)

    YARN-196. Nodemanager should be more robust in handling connection failure
    to ResourceManager when a cluster is started (Xuan Gong via hitesh)

    YARN-485. TestProcfsProcessTree#testProcessTree() doesn't wait long enough 
    for the process to die. (kkambatl via tucu)
 
    YARN-71. Fix the NodeManager to clean up local-dirs on restart.
    (Xuan Gong via sseth)

    YARN-378. Fix RM to make the AM max attempts/retries to be configurable
    per application by clients. (Zhijie Shen via vinodkv)

    YARN-498. Unmanaged AM launcher does not set various constants in env for
    an AM, also does not handle failed AMs properly. (Hitesh Shah via bikas)

    YARN-496. Fair scheduler configs are refreshed inconsistently in
    reinitialize. (Sandy Ryza via tomwhite)

    YARN-474. Fix CapacityScheduler to trigger application-activation when
    am-resource-percent configuration is refreshed. (Zhijie Shen via vinodkv)

    YARN-209. Fix CapacityScheduler to trigger application-activation when
    the cluster capacity changes. (Zhijie Shen via vinodkv)

    YARN-24. Nodemanager fails to start if log aggregation enabled and 
    namenode unavailable. (sandyr via tucu)

    YARN-515. Node Manager not getting the master key. (Robert Joseph Evans
    via jlowe)

    YARN-382. SchedulerUtils improve way normalizeRequest sets the resource
    capabilities. (Zhijie Shen via bikas)

    YARN-467. Modify public distributed cache to localize files such that no
    local directory hits unix file count limits and thus prevent job failures.
    (Omkar Vinit Joshi via vinodkv)

    YARN-101. Fix NodeManager heartbeat processing to not lose track of completed
    containers in case of dropped heartbeats. (Xuan Gong via vinodkv)

    YARN-538. RM address DNS lookup can cause unnecessary slowness on every JHS 
    page load. (sandyr via tucu)

    YARN-532. Change RMAdmin and Localization client protocol PB implementations
    to implement closeable so that they can be stopped when needed via
    RPC.stopProxy(). (Siddharth Seth via vinodkv)

    YARN-99. Modify private distributed cache to localize files such that no
    local directory hits unix file count limits and thus prevent job failures.
    (Omkar Vinit Joshi via vinodkv)

    YARN-112. Fixed a race condition during localization that fails containers.
    (Omkar Vinit Joshi via vinodkv)

    YARN-534. Change RM restart recovery to also account for AM max-attempts 
    configuration after the restart. (Jian He via vinodkv)

    YARN-539. Addressed memory leak of LocalResource objects NM when a resource
    localization fails. (Omkar Vinit Joshi via vinodkv)

    YARN-319. Submitting a job to a fair scheduler queue for which the user
    does not have permission causes the client to wait forever.
    (shenhong via tomwhite)

    YARN-412. Fixed FifoScheduler to check hostname of a NodeManager rather
    than its host:port during scheduling which caused incorrect locality for
    containers. (Roger Hoover via acmurthy)

    YARN-500. Fixed YARN webapps to not roll-over ports when explicitly asked
    to use non-ephemeral ports. (Kenji Kikushima via vinodkv)

    YARN-518. Fair Scheduler's document link could be added to the hadoop 2.x 
    main doc page. (sandyr via tucu)

    YARN-476. ProcfsBasedProcessTree info message confuses users. 
    (sandyr via tucu)

    YARN-585. Fix failure in TestFairScheduler#testNotAllowSubmitApplication
    caused by YARN-514. (Zhijie Shen via vinodkv)

    YARN-547. Fixed race conditions in public and private resource localization
    which used to cause duplicate downloads. (Omkar Vinit Joshi via vinodkv)

    YARN-594. Update test and add comments in YARN-534 (Jian He via bikas)

    YARN-549. YarnClient.submitApplication should wait for application to be
    accepted by the RM (Zhijie Shen via bikas)

    YARN-605. Fix failing unit test in TestNMWebServices when versionInfo has
    parantheses like when running on a git checkout. (Hitesh Shah via vinodkv)

    YARN-289. Fair scheduler allows reservations that won't fit on node.
    (Sandy Ryza via tomwhite)

    YARN-576. Modified ResourceManager to reject NodeManagers that don't satisy
    minimum resource requirements. (Kenji Kikushima via vinodkv)

    YARN-646. Fix two typos in Fair Scheduler user guide. (Dapeng Sun via atm)

    YARN-507. Add interface visibility and stability annotations to FS 
    interfaces/classes. (kkambatl via tucu)

    YARN-637. FS: maxAssign is not honored. (kkambatl via tucu)

    YARN-655. Fair scheduler metrics should subtract allocated memory from 
    available memory. (sandyr via tucu)

    YARN-628. Fix the way YarnRemoteException is being unrolled to extract out
    the underlying exception. (Siddharth Seth via vinodkv)

    YARN-695. Remove masterContainer and status unused fields from
    ApplicationReportProto and fix bugs in ApplicationReportPBImpl. (Zhijie Shen
    via vinodkv)

    YARN-706. Fixed race conditions in TestFSDownload. (Zhijie Shen via vinodkv).

    YARN-715. Fixed unit test failures - TestDistributedShell and
    TestUnmanagedAMLauncher. (Vinod Kumar Vavilapalli via sseth)

    YARN-578. Fixed NM to use SecureIOUtils for reading and aggregating logs.
    (Omkar Vinit Joshi via vinodkv) 

    YARN-733. Fixed TestNMClient from failing occasionally. (Zhijie Shen via
    vinodkv)

    YARN-730. Fix NMClientAsync to remove completed containers. (Zhijie Shen
    via acmurthy)

    YARN-726. Fix queue & finish time fields in web-ui for ResourceManager.
    (Mayank Bansal via acmurthy) 

    YARN-757. Changed TestRMRestart to use the default scheduler to avoid test
    failures. (Bikas Saha via vinodkv)

    YARN-742. Log aggregation causes a lot of redundant setPermission calls.
    (jlowe via kihwal)

    YARN-764. blank Used Resources on Capacity Scheduler page (Nemon Lou via
    tgraves)

    YARN-761. TestNMClientAsync fails sometimes (Zhijie Shen via bikas)

    YARN-760. NodeManager throws AvroRuntimeException on failed start.
    (Niranjan Singh via jlowe)

    YARN-767. Initialize application metrics at RM bootup. (Jian He via
    acmurthy) 

    YARN-700. TestInfoBlock fails on Windows because of line ending missmatch.
    (Ivan Mitic via cnauroth)

    YARN-117. Migrated rest of YARN to the new service model. (Steve Louhran via
    vinodkv)

    YARN-812. Set default logger for application summary logger to
    hadoop.root.logger. (sseth via acmurthy)

    YARN-848. Nodemanager does not register with RM using the fully qualified
    hostname. (Hitesh Shah via sseth)

    YARN-854. Fixing YARN bugs that are failing applications in secure
    environment. (Omkar Vinit Joshi via vinodkv)

    YARN-861. TestContainerManager is failing. (Vinod Kumar Vavilapalli via
    hitesh)

    YARN-874. Making common RPC to switch to not switch to simple when other
    mechanisms are enabled and thus fix YARN/MR test failures after HADOOP-9421.
    (Daryn Sharp and Vinod Kumar Vavilapalli via vinodkv)

    YARN-845. RM crash with NPE on NODE_UPDATE (Mayank Bansal via bikas)

    YARN-369. Handle ( or throw a proper error when receiving) status updates
    from application masters that have not registered (Mayank Bansal &
    Abhishek Kapoor via bikas)

    YARN-541. getAllocatedContainers() is not returning all the allocated
    containers (bikas)

    YARN-763. AMRMClientAsync should stop heartbeating after receiving
    shutdown from RM (Xuan Gong via bikas)

    YARN-654. AMRMClient: Perform sanity checks for parameters of public
    methods (Xuan Gong via bikas)"

    YARN-919. Document setting default heap sizes in yarn-env.sh (Mayank
    Bansal via hitesh)

    YARN-795. Fair scheduler queue metrics should subtract allocated vCores from 
    available vCores. (ywskycn via tucu) 

    YARN-799. Fix CgroupsLCEResourcesHandler to use /tasks instead of
    /cgroup.procs. (Chris Riccomini via acmurthy) 

    YARN-333. Schedulers cannot control the queue-name of an 
    application. (sandyr via tucu)

    YARN-368. Fixed a typo in error message in Auxiliary services. (Albert Chu
    via vinodkv)

    YARN-295. Fixed a race condition in ResourceManager RMAppAttempt state
    machine. (Mayank Bansal via vinodkv)

    YARN-523. Modified a test-case to validate container diagnostics on
    localization failures. (Jian He via vinodkv)

    YARN-661. Fixed NM to cleanup users' local directories correctly when
    starting up. (Omkar Vinit Joshi via vinodkv)

    YARN-820. Fixed an invalid state transition in NodeManager caused by failing
    resource localization. (Mayank Bansal via vinodkv)

    YARN-62. Modified NodeManagers to avoid AMs from abusing container tokens for
    repetitive container launches. (Omkar Vinit Joshi via vinodkv)

    YARN-814. Improving diagnostics when containers fail during launch due to
    various reasons like invalid env etc. (Jian He via vinodkv)

    YARN-897. Ensure child queues are ordered correctly to account for
    completed containers. (Djellel Eddine Difallah via acmurthy)

    YARN-853. Fixed CapacityScheduler's maximum-am-resource-percent to properly
    work beyond refreshing queues. (Devaraj K via vinodkv)

    YARN-873. YARNClient.getApplicationReport(unknownAppId) returns a null
    report (Xuan Gong via bikas)

    YARN-875. Application can hang if AMRMClientAsync callback thread has
    exception (Xuan Gong via bikas)

    YARN-461. Fair scheduler should not accept apps with empty string queue name. 
    (ywskycn via tucu)

    YARN-968. RM admin commands don't work. (vinodkv via kihwal)

    YARN-688. Fixed NodeManager to properly cleanup containers when it is shut
    down. (Jian He via vinodkv)

    YARN-960. Fixed ResourceManager to propagate client-submitted credentials
    irrespective of security. (Daryn Sharp via vinodkv)

  BREAKDOWN OF HADOOP-8562/YARN-191 SUBTASKS AND RELATED JIRAS

    YARN-158. Yarn creating package-info.java must not depend on sh.
    (Chris Nauroth via suresh)

    YARN-176. Some YARN tests fail to find winutils. (Chris Nauroth via suresh)
    
    YARN-207. YARN distribution build fails on Windows. (Chris Nauroth via
    suresh)

    YARN-199. Yarn cmd line scripts for windows. (Ivan Mitic via suresh)

    YARN-213. YARN build script would be more readable using abspath.
    (Chris Nauroth via suresh)

    YARN-233. Added support for running containers in MS Windows to YARN. (Chris
    Nauroth via acmurthy)

    YARN-234. Added support for process tree and resource calculator in MS Windows 
    to YARN. (Chris Nauroth via acmurthy)

    YARN-259. Fix LocalDirsHandlerService to use Path rather than URIs. (Xuan
    Gong via acmurthy) 

    YARN-316. YARN container launch may exceed maximum Windows command line 
    length due to long classpath. (Chris Nauroth via suresh)

    YARN-359. Fixing commands for container signalling in Windows. (Chris Nauroth
    via vinodkv)

    YARN-506. Move to common utils FileUtil#setReadable/Writable/Executable and 
    FileUtil#canRead/Write/Execute. (Ivan Mitic via suresh)

    YARN-488. TestContainerManagerSecurity fails on Windows. (Chris Nauroth
    via hitesh)

    YARN-490. TestDistributedShell fails on Windows. (Chris Nauroth via hitesh)

    YARN-491. TestContainerLogsPage fails on Windows. (Chris Nauroth via hitesh)

    YARN-487. Modify path manipulation in LocalDirsHandlerService to let
    TestDiskFailures pass on Windows. (Chris Nauroth via vinodkv)

    YARN-593. container launch on Windows does not correctly populate
    classpath with new process's environment variables and localized resources
    (Chris Nauroth via bikas)

    YARN-493. Fixed some shell related flaws in YARN on Windows. (Chris Nauroth
    via vinodkv)

    YARN-839. TestContainerLaunch.testContainerEnvVariables fails on Windows.
    (Chuan Liu via cnauroth)

    YARN-597. TestFSDownload fails on Windows due to dependencies on
    tar/gzip/jar tools. (Ivan Mitic via acmurthy) 

    YARN-852. TestAggregatedLogFormat.testContainerLogsFileAccess fails on
    Windows. (Chuan Liu via cnauroth)

    YARN-894. NodeHealthScriptRunner timeout checking is inaccurate on Windows.
    (Chuan Liu via cnauroth)

    YARN-909. Disable TestLinuxContainerExecutorWithMocks on Windows. (Chuan Liu
    via cnauroth)

    YARN-937. Fix unmanaged AM in non-secure/secure setup post YARN-701. (tucu)

Release 2.0.5-alpha - 06/06/2013

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

Release 2.0.4-alpha - 2013-04-25 

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    YARN-429. capacity-scheduler config missing from yarn-test artifact.
    (sseth via hitesh)

    YARN-470. Support a way to disable resource monitoring on the NodeManager.
    (Siddharth Seth via hitesh)
    
Release 2.0.3-alpha - 2013-02-06 

  INCOMPATIBLE CHANGES

  NEW FEATURES

    YARN-145. Add a Web UI to the fair share scheduler. (Sandy Ryza via tomwhite)

    YARN-3. Add support for CPU isolation/monitoring of containers. 
    (adferguson via tucu)

    YARN-230. RM Restart phase 1 - includes support for saving/restarting all
    applications on an RM bounce. (Bikas Saha via acmurthy)

    YARN-103. Add a yarn AM-RM client module. (Bikas Saha via sseth)

    YARN-286. Add a YARN ApplicationClassLoader. (tomwhite)

    YARN-2. Enhanced CapacityScheduler to account for CPU alongwith memory for
    multi-dimensional resource scheduling. (acmurthy)

    YARN-328. Use token request messages defined in hadoop common. (suresh)

    YARN-231. RM Restart - Add FS-based persistent store implementation for
    RMStateStore (Bikas Saha via hitesh)

  IMPROVEMENTS

    YARN-223. Update process tree instead of getting new process trees.
    (Radim Kolar via llu)

    YARN-57. Allow process-tree based resource calculation et al. to be
    pluggable to support it on multiple platforms. (Radim Kolar via acmurthy)

    YARN-78. Changed UnManagedAM application to use YarnClient. (Bikas Saha via
    vinodkv)

    YARN-93. Fixed RM to propagate diagnostics from applications that have
    finished but failed (Jason Lowe via vinodkv). 

    YARN-28. Fixed TestCompositeService to not depend on test-order and thus
    made it pass on JDK7 (Thomas Graves via vinodkv).

    YARN-82. Change the default local and log dirs to be based on
    hadoop.tmp.dir and yarn.log.dir. (Hemanth Yamijala via sseth)

    YARN-53. Added the missing getGroups API to ResourceManager. (Bo Wang via
    vinodkv)

    YARN-116. Add the ability to change the RM include/exclude file without
    a restart. (xieguiming and Harsh J via sseth)

    YARN-23. FairScheduler: FSQueueSchedulable#updateDemand() - potential 
    redundant aggregation. (kkambatl via tucu)

    YARN-127. Move RMAdmin tool to its correct location - the client module.
    (vinodkv)

    YARN-40. Provided support for missing YARN commands (Devaraj K and Vinod
    Kumar Vavilapalli via vinodkv)

    YARN-33. Change LocalDirsHandlerService to validate the configured local and
    log dirs. (Mayank Bansal via sseth)

    YARN-94. Modify DistributedShell to point to main-class by default, clean up
    the help message, and hard-code the AM class. (Hitesh Shah via vinodkv)

    YARN-146. Add unit tests for computing fair share in the fair scheduler.
    (Sandy Ryza via tomwhite)

    HADOOP-8911. CRLF characters in source and text files.
    (Raja Aluri via suresh)

    YARN-136. Make ClientToAMTokenSecretManager part of RMContext (Vinod Kumar
    Vavilapalli via sseth)

    YARN-183. Clean up fair scheduler code. (Sandy Ryza via tomwhite)

    YARN-129. Simplify classpath construction for mini YARN tests. (tomwhite)

    YARN-254. Update fair scheduler web UI for hierarchical queues. 
    (sandyr via tucu)

    YARN-315. Using the common security token protobuf definition from hadoop
    common. (Suresh Srinivas via vinodkv) 

    YARN-170. Change NodeManager stop to be reentrant. (Sandy Ryza via vinodkv)

    YARN-331. Fill in missing fair scheduler documentation. (sandyr via tucu)

    YARN-277. Use AMRMClient in DistributedShell to exemplify the approach.
    (Bikas Saha via hitesh)

    YARN-360. Allow apps to concurrently register tokens for renewal.
    (Daryn Sharp via sseth)

  OPTIMIZATIONS

  BUG FIXES 
    
    YARN-131. Fix incorrect ACL properties in capacity scheduler documentation.
    (Ahmed Radwan via sseth)

    YARN-102. Move the apache header to the top of the file in MemStore.java.
    (Devaraj K via sseth)
    
    YARN-134. ClientToAMSecretManager creates keys without checking for
    validity of the appID. (Vinod Kumar Vavilapalli via sseth)

    YARN-30. Fixed tests verifying web-services to work on JDK7. (Thomas Graves
    via vinodkv)

    YARN-150. Fixes AppRejectedTransition does not unregister a rejected
    app-attempt from the ApplicationMasterService (Bikas Saha via sseth)

    YARN-140. Add capacity-scheduler-default.xml to provide a default set of
    configurations for the capacity scheduler. (ahmed via tucu)

    YARN-179. Fix some unit test failures. (Vinod Kumar Vavilapalli via sseth)

    YARN-181. Fixed eclipse settings broken by capacity-scheduler.xml move via
    YARN-140. (Siddharth Seth via vinodkv)

    YARN-169. Update log4j.appender.EventCounter to use
    org.apache.hadoop.log.metrics.EventCounter (Anthony Rojas via tomwhite)

    YARN-184. Remove unnecessary locking in fair scheduler, and address 
    findbugs excludes. (sandyr via tucu)

    YARN-224. Fair scheduler logs too many nodeUpdate INFO messages.
    (Sandy Ryza via tomwhite)

    YARN-222. Fair scheduler should create queue for each user by default.
    (Sandy Ryza via tomwhite)

    MAPREDUCE-4778. Fair scheduler event log is only written if directory
    exists on HDFS. (Sandy Ryza via tomwhite)

    YARN-229. Remove old unused RM recovery code. (Bikas Saha via acmurthy) 

    YARN-187. Add hierarchical queues to the fair scheduler.
    (Sandy Ryza via tomwhite)

    YARN-72. NM should handle cleaning up containers when it shuts down.
    (Sandy Ryza via tomwhite)

    YARN-267. Fix fair scheduler web UI. (Sandy Ryza via tomwhite)

    YARN-264. y.s.rm.DelegationTokenRenewer attempts to renew token even 
    after removing an app. (kkambatl via tucu)

    YARN-271. Fair scheduler hits IllegalStateException trying to reserve
    different apps on same node. (Sandy Ryza via tomwhite)

    YARN-272. Fair scheduler log messages try to print objects without 
    overridden toString methods. (sandyr via tucu)

    YARN-278. Fair scheduler maxRunningApps config causes no apps to make
    progress. (sandyr via tucu)

    YARN-282. Fair scheduler web UI double counts Apps Submitted. 
    (sandyr via tucu)

    YARN-283. Fair scheduler fails to get queue info without root prefix. 
    (sandyr via tucu)

    YARN-192. Node update causes NPE in the fair scheduler.
    (Sandy Ryza via tomwhite)

    YARN-288. Fair scheduler queue doesn't accept any jobs when ACLs are
    configured. (Sandy Ryza via tomwhite)

    YARN-300. After YARN-271, fair scheduler can infinite loop and not
    schedule any application. (Sandy Ryza via tomwhite)

    YARN-301. Fair scheduler throws ConcurrentModificationException when
    iterating over app's priorities. (Sandy Ryza via tomwhite)

    YARN-217. Fix RMAdmin protocol description to make it work in secure mode
    also. (Devaraj K via vinodkv)

    YARN-253. Fixed container-launch to not fail when there are no local
    resources to localize. (Tom White via vinodkv)

    YARN-330. Fix flakey test: TestNodeManagerShutdown#testKillContainersOnShutdown.
    (Sandy Ryza via hitesh)
    
    YARN-335. Fair scheduler doesn't check whether rack needs containers
    before assigning to node. (Sandy Ryza via tomwhite)
    
    YARN-336. Fair scheduler FIFO scheduling within a queue only allows 1
    app at a time. (Sandy Ryza via tomwhite)

    YARN-135. Client tokens should be per app-attempt, and should be
    unregistered on App-finish. (vinodkv via sseth)

    YARN-302. Fair scheduler assignmultiple should default to false. (sandyr via tucu)
    
    YARN-372. Move InlineDispatcher from hadoop-yarn-server-resourcemanager to
    hadoop-yarn-common (sseth via hitesh)

    YARN-370. Fix SchedulerUtils to correctly round up the resource for
    containers. (Zhijie Shen via acmurthy) 

    YARN-355. Fixes a bug where RM app submission could jam under load.
    (Daryn Sharp via sseth)

Release 2.0.2-alpha - 2012-09-07 

    YARN-9. Rename YARN_HOME to HADOOP_YARN_HOME. (vinodkv via acmurthy)

  NEW FEATURES

    YARN-1. Promote YARN to be a sub-project of Apache Hadoop. (acmurthy)

  IMPROVEMENTS

    YARN-29. Add a yarn-client module. (Vinod Kumar Vavilapalli via sseth)

    YARN-10. Fix DistributedShell module to not have a dependency on 
    hadoop-mapreduce-client-core. (Hitesh Shah via vinodkv)

    YARN-80. Add support for delaying rack-local containers in
    CapacityScheduler. (acmurthy) 

    YARN-137. Change the default YARN scheduler to be the CapacityScheduler. 
    (sseth via acmurthy) 

  OPTIMIZATIONS

  BUG FIXES

    YARN-13. Fix pom versions for YARN in branch-2 (todd)

    MAPREDUCE-2374. "Text File Busy" errors launching MR tasks. (Andy Isaacson
    via atm)

    YARN-12. Fix findbugs warnings in FairScheduler. (Junping Du via acmurthy) 

    YARN-22. Fix ContainerLogs to work if the log-dir is specified as a URI.
    (Mayank Bansal via sseth)

    YARN-37. Change TestRMAppTransitions to use the DrainDispatcher.
    (Mayank Bansal via sseth)

    YARN-79. Implement close on all clients to YARN so that RPC clients don't
    throw exceptions on shut-down. (Vinod Kumar Vavilapalli)

    YARN-42. Modify NM's non-aggregating logs' handler to stop properly so that
    NMs don't get NPEs on startup errors. (Devaraj K via vinodkv)

    YARN-15. Updated default classpath for YARN applications to reflect split of
    YARN into a sub-project. (Arun C Murthy via vinodkv)

    YARN-75. Modified ResourceManager's RMContainer to handle a valid RELEASE
    event at RUNNING state. (Siddharth Seth via vinodkv)

    YARN-138. Ensure default values for minimum/maximum container sizes is
    sane. (harsh & sseth via acmurthy)

Release 0.23.9 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

Release 0.23.8 - 2013-06-05

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

    YARN-548. Add tests for YarnUncaughtExceptionHandler (Vadim Bondarev via
    jeagles)

  BUG FIXES

    YARN-363. Add webapps/proxy directory without which YARN proxy-server fails
    when started in stand-alone mode. (Kenji Kikushima via vinodkv)

    YARN-690. RM exits on token cancel/renew problems (daryn via bobby)

Release 0.23.7 - 2013-04-18

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-133 Update web services docs for RM clusterMetrics (Ravi Prakash via
    kihwal)

    YARN-249. Capacity Scheduler web page should show list of active users per 
    queue like it used to (in 1.x) (Ravi Prakash via tgraves)

    YARN-236. RM should point tracking URL to RM web page when app fails to
    start (Jason Lowe via jeagles)

    YARN-269. Resource Manager not logging the health_check_script result when
    taking it out (Jason Lowe via kihwal)

    YARN-227. Application expiration difficult to debug for end-users
    (Jason Lowe via jeagles)

    YARN-443. allow OS scheduling priority of NM to be different than the 
    containers it launches (tgraves)

    YARN-468. coverage fix for org.apache.hadoop.yarn.server.webproxy.amfilter
    (Aleksey Gorshkov via bobby)

    YARN-200. yarn log does not output all needed information, and is in a
    binary format (Ravi Prakash via jlowe)

    YARN-525. make CS node-locality-delay refreshable (Thomas Graves via jlowe)

  OPTIMIZATIONS

    YARN-357. App submission should not be synchronized (daryn)

  BUG FIXES

    YARN-343. Capacity Scheduler maximum-capacity value -1 is invalid (Xuan 
    Gong via tgraves)

    YARN-364. AggregatedLogDeletionService can take too long to delete logs
    (jlowe)

    YARN-362. Unexpected extra results when using webUI table search (Ravi
    Prakash via jlowe)

    YARN-400. RM can return null application resource usage report leading to 
    NPE in client (Jason Lowe via tgraves)

    YARN-426. Failure to download a public resource prevents further downloads
    (Jason Lowe via bobby)

    YARN-448. Remove unnecessary hflush from log aggregation (Kihwal Lee via
    bobby)

    YARN-345. Many InvalidStateTransitonException errors for ApplicationImpl
    in Node Manager (Robert Parker via jlowe)

    YARN-109. .tmp file is not deleted for localized archives (Mayank Bansal 
    via bobby)

    YARN-460. CS user left in list of active users for the queue even when 
    application finished (tgraves)

Release 0.23.6 - 2013-02-06

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-285. Added a temporary plugin interface for RM to be able to redirect
    to JobHistory server for apps that it no longer tracks. (Derek Dagit via
    vinodkv)

  OPTIMIZATIONS

  BUG FIXES

    YARN-188. Coverage fixing for CapacityScheduler (Aleksey Gorshkov via
    bobby)

    YARN-214. RMContainerImpl does not handle event EXPIRE at state RUNNING
    (jeagles via bobby)

    YARN-151. Browser thinks RM main page JS is taking too long 
    (Ravi Prakash via bobby)

    YARN-204. test coverage for org.apache.hadoop.tools (Aleksey Gorshkov via
    bobby)

    YARN-251. Proxy URI generation fails for blank tracking URIs (Tom White
    via jlowe)

    YARN-258. RM web page UI shows Invalid Date for start and finish times
    (Ravi Prakash via jlowe)

    YARN-266. RM and JHS Web UIs are blank because AppsBlock is not escaping
    string properly (Ravi Prakash via jlowe)

    YARN-280. RM does not reject app submission with invalid tokens 
    (Daryn Sharp via tgraves)

    YARN-225. Proxy Link in RM UI thows NPE in Secure mode 
    (Devaraj K via bobby)

    YARN-293. Node Manager leaks LocalizerRunner object for every Container
    (Robert Joseph Evans via jlowe)

    YARN-50. Implement renewal / cancellation of Delegation Tokens
    (Siddharth Seth via tgraves)

    YARN-320. RM should always be able to renew its own tokens. 
    (Daryn Sharp via sseth)

    YARN-325. RM CapacityScheduler can deadlock when getQueueInfo() is 
    called and a container is completing (Arun C Murthy via tgraves)

    YARN-334. Maven RAT plugin is not checking all source files (tgraves)

    YARN-354. WebAppProxyServer exits immediately after startup (Liang Xie via
    jlowe)

Release 0.23.5 - 2012-11-28

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-161. Fix multiple compiler warnings for unchecked operations in YARN
    common. (Chris Nauroth via vinodkv)

    YARN-43. Fix TestResourceTrackerService to not depend on test order and thus
    pass on JDK7. (Thomas Graves via vinodkv)

    YARN-32. Fix TestApplicationTokens to not depend on test order and thus pass
    on JDK7. (vinodkv)

    YARN-186. Coverage fixing LinuxContainerExecutor (Aleksey Gorshkov via
    bobby)

    YARN-216. Remove jquery theming support. (Robert Joseph Evans via jlowe)

  OPTIMIZATIONS

  BUG FIXES

    YARN-163. Retrieving container log via NM webapp can hang with multibyte
    characters in log (jlowe via bobby)

    YARN-174. Modify NodeManager to pass the user's configuration even when
    rebooting. (vinodkv)

    YARN-177. CapacityScheduler - adding a queue while the RM is running has 
    wacky results (acmurthy vai tgraves)

    YARN-178. Fix custom ProcessTree instance creation (Radim Kolar via bobby)

    YARN-180. Capacity scheduler - containers that get reserved create 
    container token to early (acmurthy and bobby)

    YARN-139. Interrupted Exception within AsyncDispatcher leads to user
    confusion. (Vinod Kumar Vavilapalli via jlowe)

    YARN-165. RM should point tracking URL to RM web page for app when AM fails
    (jlowe via bobby)

    YARN-159. RM web ui applications page should be sorted to display last app
    first (tgraves via bobby)

    YARN-166. capacity scheduler doesn't allow capacity < 1.0 (tgraves via
    bobby)

    YARN-189. Fixed a deadlock between RM's ApplicationMasterService and the
    dispatcher. (Thomas Graves via vinodkv)

    YARN-202. Log Aggregation generates a storm of fsync() for namenode 
    (Kihwal Lee via bobby)

    YARN-201. Fix CapacityScheduler to be less conservative for starved 
    off-switch requests. (jlowe via acmurthy) 

    YARN-206. TestApplicationCleanup.testContainerCleanup occasionally fails.
    (jlowe via jeagles)

    YARN-212. NM state machine ignores an APPLICATION_CONTAINER_FINISHED event
    when it shouldn't (Nathan Roberts via jlowe)

    YARN-219. NM should aggregate logs when application finishes. (bobby)

Release 0.23.4

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    Change package of YarnClient to org.apache.hadoop. (Bikas Saha via vinodkv)

    YARN-108. FSDownload can create cache directories with the wrong
    permissions (Jason Lowe via bobby)

    YARN-57. Allow process-tree based resource calculation et al. to be
    pluggable to support it on multiple platforms. (Radim Kolar via acmurthy)

  OPTIMIZATIONS

  BUG FIXES

    YARN-88. DefaultContainerExecutor can fail to set proper permissions.
    (Jason Lowe via sseth)

    YARN-106. Nodemanager needs to set permissions of local directories (jlowe
    via bobby)

Release 0.23.3

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMAZATIONS

  BUG FIXES

    YARN-14. Symlinks to peer distributed cache files no longer work 
    (Jason Lowe via bobby) 

    YARN-25. remove old aggregated logs  (Robert Evans via tgraves)

    YARN-27. Failed refreshQueues due to misconfiguration prevents further 
    refreshing of queues (Arun Murthy via tgraves)

    MAPREDUCE-4323. NM leaks filesystems (Jason Lowe via jeagles)
    
    YARN-39. RM-NM secret-keys should be randomly generated and rolled every
    so often. (vinodkv and sseth via sseth)

    YARN-31. Fix TestDelegationTokenRenewer to not depend on test order so as to
    pass tests on jdk7. (Thomas Graves via vinodkv)

    YARN-63. RMNodeImpl is missing valid transitions from the UNHEALTHY state
    (Jason Lowe via bobby)

    YARN-60. Fixed a bug in ResourceManager which causes all NMs to get NPEs and
    thus causes all containers to be rejected. (vinodkv)

    YARN-66. aggregated logs permissions not set properly (tgraves via bobby)

    YARN-68. NodeManager will refuse to shutdown indefinitely due to container
    log aggregation (daryn via bobby)

    YARN-87. NM ResourceLocalizationService does not set permissions of local 
    cache directories (Jason Lowe via tgraves)