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<h1>Hadoop 0.20.203.0 Release Notes</h1>
		These release notes include new developer and user-facing incompatibilities, features, and major improvements. 

		<a name="changes"></a>
<h2>Changes Since Hadoop 0.20.2</h2>

<ul>
<li> <a href="https://issues.apache.org/jira/browse/HADOOP-7190">HADOOP-7190</a>. Add metrics v1 back for backwards compatibility. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2360">MAPREDUCE-2360</a>. Remove stripping of scheme, authority from submit dir in 
    support of viewfs. (cdouglas)
    
<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2359">MAPREDUCE-2359</a> Use correct file system to access distributed cache objects.
    (Krishna Ramachandran)
 
<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2361">MAPREDUCE-2361</a>. "Fix Distributed Cache is not adding files to class paths
    correctly" - Drop the host/scheme/fragment from URI (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2362">MAPREDUCE-2362</a>. Fix unit-test failures: TestBadRecords (NPE due to
    rearranged MapTask code) and TestTaskTrackerMemoryManager
    (need hostname in output-string pattern). (Greg Roelofs, Krishna 
    Ramachandran)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1729">HDFS-1729</a>. Add statistics logging for better visibility into
    startup time costs. (Matt Foley)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2363">MAPREDUCE-2363</a>.  When a queue is built without any access rights we 
    explain the problem.  (Richard King)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1563">MAPREDUCE-1563</a>. TaskDiagnosticInfo may be missed sometime. (Krishna 
    Ramachandran)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2364">MAPREDUCE-2364</a>. Don't hold the rjob lock while localizing resources. (ddas
    via omalley)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1598">HDFS-1598</a>. Directory listing on hftp:// does not show
    .*.crc files.  (szetszwo)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2365">MAPREDUCE-2365</a>. New counters for FileInputFormat (BYTES_READ) and 
    FileOutputFormat (BYTES_WRITTEN). 
    New counter MAP_OUTPUT_MATERIALIZED_BYTES for compressed MapOutputSize.
    (Siddharth Seth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-7040">HADOOP-7040</a>. Change DiskErrorException to IOException (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-7104">HADOOP-7104</a>. Remove unnecessary DNS reverse lookups from RPC layer 
    (kzhang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2366">MAPREDUCE-2366</a>.  Fix a problem where the task browser UI can't retrieve the
    stdxxx printouts of streaming jobs that abend in the unix code, in
    the common case where the containing job doesn't reuse JVM's.
    (Richard King)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6977">HADOOP-6977</a>. Herriot daemon clients should vend statistics (cos)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6971">HADOOP-6971</a>. Clover build doesn't generate per-test coverage (cos)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6879">HADOOP-6879</a>. Provide SSH based (Jsch) remote execution API for system
    tests. (cos)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2355">MAPREDUCE-2355</a>. Add a configuration knob 
    mapreduce.tasktracker.outofband.heartbeat.damper that limits out of band
    heartbeats (acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2356">MAPREDUCE-2356</a>. Fix a race-condition that corrupted a task's state on the 
    JobTracker. (Luke Lu)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2357">MAPREDUCE-2357</a>. Always propagate IOExceptions that are thrown by 
    non-FileInputFormat. (Luke Lu)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-7163">HADOOP-7163</a>. RPC handles SocketTimeOutException during SASL negotiation.
    (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2358">MAPREDUCE-2358</a>. MapReduce assumes the default FileSystem is HDFS.
    (Krishna Ramachandran)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1904">MAPREDUCE-1904</a>. Reducing locking contention in TaskTracker's 
    MapOutputServlet LocalDirAllocator. (Rajesh Balamohan via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1626">HDFS-1626</a>. Make BLOCK_INVALIDATE_LIMIT configurable. (szetszwo)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1584">HDFS-1584</a>. Adds a check for whether relogin is needed to 
    getDelegationToken in HftpFileSystem. (Kan Zhang via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-7115">HADOOP-7115</a>. Reduces the number of calls to getpwuid_r and 
    getpwgid_r, by implementing a cache in NativeIO. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6882">HADOOP-6882</a>. An XSS security exploit in jetty-6.1.14. jetty upgraded to
    6.1.26. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2278">MAPREDUCE-2278</a>. Fixes a memory leak in the TaskTracker. (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1353 redux">HDFS-1353 redux</a>. Modulate original 1353  to not bump RPC version.
    (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2082">MAPREDUCE-2082</a> Race condition in writing the jobtoken password file when 
    launching pipes jobs (jitendra and ddas)
                
    <a href="https://issues.apache.org/jira/browse/HADOOP-6978">HADOOP-6978</a>. Fixes task log servlet vulnerabilities via symlinks. 
    (Todd Lipcon and Devaraj Das)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2178">MAPREDUCE-2178</a>. Write task initialization to avoid race 
    conditions leading to privilege escalation and resource leakage by 
    performing more actiions as the user. (Owen O'Malley, Devaraj Das, 
    Chris Douglas via cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1364">HDFS-1364</a>. HFTP client should support relogin from keytab

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6907">HADOOP-6907</a>. Make RPC client to use per-proxy configuration.
    (Kan Zhang via ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2055">MAPREDUCE-2055</a>. Fix JobTracker to decouple job retirement from copy of 
    job-history file to HDFS and enhance RetiredJobInfo to carry aggregated 
    job-counters to prevent a disk roundtrip on job-completion to fetch 
    counters for the JobClient. (Krishna Ramachandran via acmurthy)
                
    <a href="https://issues.apache.org/jira/browse/HDFS-1353">HDFS-1353</a>. Remove most of getBlockLocation optimization (jghoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2023">MAPREDUCE-2023</a>. TestDFSIO read test may not read specified bytes. (htang)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1340">HDFS-1340</a>. A null delegation token is appended to the url if security is 
    disabled when browsing filesystem.(boryas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1352">HDFS-1352</a>. Fix jsvc.location. (jghoman)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6860">HADOOP-6860</a>. 'compile-fault-inject' should never be called directly. (cos)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2005">MAPREDUCE-2005</a>. TestDelegationTokenRenewal fails (boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2000">MAPREDUCE-2000</a>. Rumen is not able to extract counters for Job history logs
    from Hadoop 0.20. (htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1961">MAPREDUCE-1961</a>. ConcurrentModificationException when shutting down Gridmix.
    (htang)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6899">HADOOP-6899</a>. RawLocalFileSystem set working directory does
    not work for relative names. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-495">HDFS-495</a>. New clients should be able to take over files lease if the old 
    client died. (shv)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6728">HADOOP-6728</a>. Re-design and overhaul of the Metrics framework. (Luke Lu via
    acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1966">MAPREDUCE-1966</a>. Change blacklisting of tasktrackers on task failures to be
    a simple graylist to fingerpoint bad tasktrackers. (Greg Roelofs via
    acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6864">HADOOP-6864</a>. Add ability to get netgroups (as returned by getent
    netgroup command) using native code (JNI) instead of forking. (Erik Steffl)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1318">HDFS-1318</a>. HDFS Namenode and Datanode WebUI information needs to be 
    accessible programmatically for scripts. (Tanping Wang via suresh)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1315">HDFS-1315</a>. Add fsck event to audit log and remove other audit log events 
    corresponding to FSCK listStatus and open calls. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1941">MAPREDUCE-1941</a>. Provides access to JobHistory file (raw) with job user/acl 
    permission. (Srikanth Sundarrajan via ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-291.">MAPREDUCE-291.</a> Optionally a separate daemon should serve JobHistory.
    (Srikanth Sundarrajan via ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1936">MAPREDUCE-1936</a>. Make Gridmix3 more customizable (sync changes from trunk).
    (htang)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5981">HADOOP-5981</a>. Fix variable substitution during parsing of child environment
    variables. (Krishna Ramachandran via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-339.">MAPREDUCE-339.</a> Greedily schedule failed tasks to cause early job failure.
    (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1872">MAPREDUCE-1872</a>. Hardened CapacityScheduler to have comprehensive, coherent
    limits on tasks/jobs for jobs/users/queues. Also, added the ability to
    refresh queue definitions without the need to restart the JobTracker.
    (acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1161">HDFS-1161</a>. Make DN minimum valid volumes configurable. (shv)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-457">HDFS-457</a>. Reintroduce volume failure tolerance for DataNodes. (shv)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1307 Add start time, end time and total time taken for FSCK 
    to FSCK report">HDFS-1307 Add start time, end time and total time taken for FSCK 
    to FSCK report</a>. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1207">MAPREDUCE-1207</a>. Sanitize user environment of map/reduce tasks and allow 
    admins to set environment and java options. (Krishna Ramachandran via
    acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1298 - Add support in HDFS for new statistics added in FileSystem
    to track the file system operations (suresh)

<li> HDFS-1301">HDFS-1298 - Add support in HDFS for new statistics added in FileSystem
    to track the file system operations (suresh)

<li> HDFS-1301</a>. TestHDFSProxy need to use server side conf for ProxyUser  
    stuff.(boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6859">HADOOP-6859</a> - Introduce additional statistics to FileSystem to track 
    file system operations (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6818">HADOOP-6818</a>. Provides a JNI implementation of Unix Group resolution. The 
    config hadoop.security.group.mapping should be set to 
    org.apache.hadoop.security.JniBasedUnixGroupsMapping to enable this
    implementation. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1938">MAPREDUCE-1938</a>. Introduces a configuration for putting user classes before
    the system classes during job submission and in task launches. Two things
    need to be done in order to use this feature - 
    (1) mapreduce.user.classpath.first : this should be set to true in the 
    jobconf, and, (2) HADOOP_USER_CLASSPATH_FIRST : this is relevant for job 
    submissions done using bin/hadoop shell script. HADOOP_USER_CLASSPATH_FIRST
    should be defined in the environment with some non-empty value 
    (like "true"), and then bin/hadoop should be executed. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6669">HADOOP-6669</a>. Respect compression configuration when creating DefaultCodec
    compressors. (Koji Noguchi via cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6855">HADOOP-6855</a>. Add support for netgroups, as returned by command
    getent netgroup. (Erik Steffl)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-599">HDFS-599</a>. Allow NameNode to have a seprate port for service requests from
    client requests. (Dmytro Molkov via hairong)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-132">HDFS-132</a>. Fix namenode to not report files deleted metrics for deletions
    done while replaying edits during startup. (shv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1521">MAPREDUCE-1521</a>. Protection against incorrectly configured reduces
    (mahadev) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1936">MAPREDUCE-1936</a>. Make Gridmix3 more customizable. (htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-517.">MAPREDUCE-517.</a> Enhance the CapacityScheduler to assign multiple tasks
    per-heartbeat. (acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-323.">MAPREDUCE-323.</a> Re-factor layout of JobHistory files on HDFS to improve 
    operability. (Dick King via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1921">MAPREDUCE-1921</a>. Ensure exceptions during reading of input data in map
    tasks are augmented by information about actual input file which caused
    the exception. (Krishna Ramachandran via acmurthy)  

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1118">MAPREDUCE-1118</a>. Enhance the JobTracker web-ui to ensure tabular columns
    are sortable, also added a /scheduler servlet to CapacityScheduler for
    enhanced UI for queue information. (Krishna Ramachandran via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5913">HADOOP-5913</a>. Add support for starting/stopping queues. (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6835">HADOOP-6835</a>. Add decode support for concatenated gzip files. (Greg Roelofs)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1158">HDFS-1158</a>. Revert <a href="https://issues.apache.org/jira/browse/HDFS-457">HDFS-457</a>. (shv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1699">MAPREDUCE-1699</a>. Ensure JobHistory isn't disabled for any reason. (Krishna
    Ramachandran via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1682">MAPREDUCE-1682</a>. Fix speculative execution to ensure tasks are not
    scheduled after job failure. (acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1914">MAPREDUCE-1914</a>. Ensure unique sub-directories for artifacts in the
    DistributedCache are cleaned up. (Dick King via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6713">HADOOP-6713</a>. Multiple RPC Reader Threads (Bharathm)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1250">HDFS-1250</a>. Namenode should reject block reports and block received
    requests from dead datanodes (suresh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1863">MAPREDUCE-1863</a>. [Rumen] Null failedMapAttemptCDFs in job traces generated 
    by Rumen. (htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1309">MAPREDUCE-1309</a>. Rumen refactory. (htang)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1114">HDFS-1114</a>. Implement LightWeightGSet for BlocksMap in order to reduce
    NameNode memory footprint.  (szetszwo)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-572.">MAPREDUCE-572.</a> Fixes DistributedCache.checkURIs to throw error if link is
    missing for uri in cache archives. (amareshwari)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-787.">MAPREDUCE-787.</a> Fix JobSubmitter to honor user given symlink in the path.
    (amareshwari)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6815">HADOOP-6815</a>. refreshSuperUserGroupsConfiguration should use 
    server side configuration for the refresh( boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1868">MAPREDUCE-1868</a>. Add a read and connection timeout to JobClient while
    pulling tasklogs. (Krishna Ramachandran via acmurthy)   

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1119">HDFS-1119</a>. Introduce a GSet interface to BlocksMap.  (szetszwo)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1778">MAPREDUCE-1778</a>. Ensure failure to setup CompletedJobStatusStore is not
    silently ignored by the JobTracker. (Krishna Ramachandran via acmurthy)  

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1538">MAPREDUCE-1538</a>. Add a limit on the number of artifacts in the
    DistributedCache to ensure we cleanup aggressively. (Dick King via
    acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1850">MAPREDUCE-1850</a>. Add information about the host from which a job is
    submitted. (Krishna Ramachandran via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1110">HDFS-1110</a>. Reuses objects for commonly used file names in namenode to
    reduce the heap usage. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6810">HADOOP-6810</a>. Extract a subset of tests for smoke (DOA) validation. (cos)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6642">HADOOP-6642</a>. Remove debug stmt left from original patch. (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6808">HADOOP-6808</a>. Add comments on how to setup File/Ganglia Context for
    kerberos metrics (Erik Steffl)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1061">HDFS-1061</a>.  INodeFile memory optimization. (bharathm)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1109">HDFS-1109</a>. HFTP supports filenames that contains the character "+".
    (Dmytro Molkov via dhruba, backported by szetszwo)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1085">HDFS-1085</a>. Check file length and bytes read when reading a file through
    hftp in order to detect failure.  (szetszwo)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1311">HDFS-1311</a>. Running tests with 'testcase' cause triple execution of the
    same test case (cos)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1150">HDFS-1150</a>.FIX.  Verify datanodes' identities to clients in secure clusters.
    Update to patch to improve handling of jsvc source in build.xml (jghoman)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6752">HADOOP-6752</a>. Remote cluster control functionality needs JavaDocs
    improvement. (Balaji Rajagopalan via cos)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1288">MAPREDUCE-1288</a>. Fixes TrackerDistributedCacheManager to take into account
    the owner of the localized file in the mapping from cache URIs to 
    CacheStatus objects. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1682">MAPREDUCE-1682</a>. Fix speculative execution to ensure tasks are not
    scheduled after job failure. (acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1914">MAPREDUCE-1914</a>. Ensure unique sub-directories for artifacts in the
    DistributedCache are cleaned up. (Dick King via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1538">MAPREDUCE-1538</a>. Add a limit on the number of artifacts in the
    DistributedCache to ensure we cleanup aggressively. (Dick King via
    acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1900">MAPREDUCE-1900</a>. Fixes a FS leak that i missed in the earlier patch.
    (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1900">MAPREDUCE-1900</a>. Makes JobTracker/TaskTracker close filesystems, created
    on behalf of users, when they are no longer needed. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6832">HADOOP-6832</a>. Add a static user plugin for web auth for external users.
    (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1007">HDFS-1007</a>. Fixes a bug in SecurityUtil.buildDTServiceName to do
    with handling of null hostname. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1007">HDFS-1007</a>. makes long running servers using hftp work. Also has some
    refactoring in the MR code to do with handling of delegation tokens. 
    (omalley & ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1178">HDFS-1178</a>. The NameNode servlets should not use RPC to connect to the
    NameNode. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1807">MAPREDUCE-1807</a>. Re-factor TestQueueManager. (Richard King via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1150">HDFS-1150</a>. Fixes the earlier patch to do logging in the right directory
    and also adds facility for monitoring processes (via -Dprocname in the
    command line). (Jakob Homan via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6781">HADOOP-6781</a>. security audit log shouldn't have exception in it. (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6776">HADOOP-6776</a>. Fixes the javadoc in UGI.createProxyUser. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1150">HDFS-1150</a>. building jsvc from source tar. source tar is also checked in.
    (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1150">HDFS-1150</a>. Bugfix in the hadoop shell script. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1153">HDFS-1153</a>. The navigation to /dfsnodelist.jsp with invalid input 
    parameters produces NPE and HTTP 500 error (rphulari)
    
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1664">MAPREDUCE-1664</a>. Bugfix to enable queue administrators of a queue to
    view job details of jobs submitted to that queue even though they
    are not part of acl-view-job. 

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1150">HDFS-1150</a>. Bugfix to add more knobs to secure datanode starter.

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1157">HDFS-1157</a>. Modifications introduced by <a href="https://issues.apache.org/jira/browse/HDFS-1150 are breaking aspect's
    bindings (cos)

<li> HDFS-1130">HDFS-1150 are breaking aspect's
    bindings (cos)

<li> HDFS-1130</a>. Adds a configuration dfs.cluster.administrators for 
    controlling access to the default servlets in hdfs. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6706">HADOOP-6706</a>.FIX. Relogin behavior for RPC clients could be improved 
    (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1150">HDFS-1150</a>. Verify datanodes' identities to clients in secure clusters.
    (jghoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1442">MAPREDUCE-1442</a>. Fixed regex in job-history related to parsing Counter
    values. (Luke Lu via acmurthy)  

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6760">HADOOP-6760</a>. WebServer shouldn't increase port number in case of negative
    port setting caused by Jetty's race. (cos)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1146">HDFS-1146</a>. Javadoc for getDelegationTokenSecretManager in FSNamesystem.
    (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6706">HADOOP-6706</a>. Fix on top of the earlier patch. Closes the connection
    on a SASL connection failure, and retries again with a new
    connection. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1716">MAPREDUCE-1716</a>. Fix on top of earlier patch for logs truncation a.k.a 
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1100">MAPREDUCE-1100</a>. Addresses log truncation issues when binary data is
    written to log files and adds a header to a truncated log file to
    inform users of the done trucation.

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1383">HDFS-1383</a>. Improve the error messages when using hftp://.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1744">MAPREDUCE-1744</a>. Fixed DistributedCache apis to take a user-supplied
    FileSystem to allow for better proxy behaviour for Oozie. (Richard King) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1733">MAPREDUCE-1733</a>. Authentication between pipes processes and java 
    counterparts. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1664">MAPREDUCE-1664</a>. Bugfix on top of the previous patch. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1136">HDFS-1136</a>. FileChecksumServlets.RedirectServlet doesn't carry forward 
    the delegation token (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6756">HADOOP-6756</a>. Change value of FS_DEFAULT_NAME_KEY from fs.defaultFS
    to fs.default.name which is a correct name for 0.20 (steffl)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6756">HADOOP-6756</a>. Document (javadoc comments) and cleanup configuration
    keys in CommonConfigurationKeys.java (steffl)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1759">MAPREDUCE-1759</a>. Exception message for unauthorized user doing killJob,
    killTask, setJobPriority needs to be improved. (gravi via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6715">HADOOP-6715</a>. AccessControlList.toString() returns empty string when
    we set acl to "*". (gravi via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6757">HADOOP-6757</a>. NullPointerException for hadoop clients launched from
    streaming tasks. (amarrk via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6631">HADOOP-6631</a>. FileUtil.fullyDelete() should continue to delete other files
    despite failure at any level. (vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1317">MAPREDUCE-1317</a>. NPE in setHostName in Rumen. (rksingh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1754">MAPREDUCE-1754</a>. Replace mapred.persmissions.supergroup with an acl : 
    mapreduce.cluster.administrators and <a href="https://issues.apache.org/jira/browse/HADOOP-6748">HADOOP-6748</a>.: Remove
    hadoop.cluster.administrators. Contributed by Amareshwari Sriramadasu.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6701">HADOOP-6701</a>.  Incorrect exit codes for "dfs -chown", "dfs -chgrp"
    (rphulari)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6640">HADOOP-6640</a>. FileSystem.get() does RPC retires within a static
    synchronized block. (hairong)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1006">HDFS-1006</a>. Removes unnecessary logins from the previous patch. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6745">HADOOP-6745</a>. adding some java doc to Server.RpcMetrics, UGI (boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1707">MAPREDUCE-1707</a>. TaskRunner can get NPE in getting ugi from TaskTracker. 
    (vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1104">HDFS-1104</a>. Fsck triggers full GC on NameNode. (hairong)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6332">HADOOP-6332</a>. Large-scale Automated Test Framework (sharad, Sreekanth
    Ramakrishnan, at all via cos)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6526">HADOOP-6526</a>. Additional fix for test context on top of existing one. (cos)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6710">HADOOP-6710</a>. Symbolic umask for file creation is not conformant with posix.
    (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6693">HADOOP-6693</a>. Added metrics to track kerberos login success and failure.
    (suresh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1711">MAPREDUCE-1711</a>. Gridmix should provide an option to submit jobs to the same
    queues as specified in the trace. (rksing via htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1687">MAPREDUCE-1687</a>. Stress submission policy does not always stress the
    cluster. (htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1641">MAPREDUCE-1641</a>. Bug-fix to ensure command line options such as
    -files/-archives are checked for duplicate artifacts in the
    DistributedCache. (Amareshwari Sreeramadasu via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1641">MAPREDUCE-1641</a>. Fix DistributedCache to ensure same files cannot be put in
    both the archives and files sections. (Richard King via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6670">HADOOP-6670</a>. Fixes a testcase issue introduced by the earlier commit
    of the <a href="https://issues.apache.org/jira/browse/HADOOP-6670">HADOOP-6670</a> patch. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1718">MAPREDUCE-1718</a>. Fixes a problem to do with correctly constructing
    service name for the delegation token lookup in HftpFileSystem
    (borya via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6674">HADOOP-6674</a>. Fixes the earlier patch to handle pings correctly (ddas).

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1664">MAPREDUCE-1664</a>. Job Acls affect when Queue Acls are set. 
    (Ravi Gummadi via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6718">HADOOP-6718</a>. Fixes a problem to do with clients not closing RPC
    connections on a SASL failure. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1397">MAPREDUCE-1397</a>. NullPointerException observed during task failures.
    (Amareshwari Sriramadasu via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6670">HADOOP-6670</a>. Use the UserGroupInformation's Subject as the criteria for
    equals and hashCode. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6716">HADOOP-6716</a>. System won't start in non-secure mode when kerb5.conf 
   (edu.mit.kerberos on Mac) is not present. (boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1607">MAPREDUCE-1607</a>. Task controller may not set permissions for a 
    task cleanup attempt's log directory. (Amareshwari Sreeramadasu via 
    vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1533">MAPREDUCE-1533</a>. JobTracker performance enhancements. (Amar Kamat via 
    vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1701">MAPREDUCE-1701</a>.  AccessControlException while renewing a delegation token 
    in not correctly handled in the JobTracker. (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-481">HDFS-481</a>. Incremental patch to fix broken unit test in contrib/hdfsproxy

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6706">HADOOP-6706</a>. Fixes a bug in the earlier version of the same patch (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1096">HDFS-1096</a>. allow dfsadmin/mradmin refresh of superuser proxy group 
    mappings(boryas).

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1012">HDFS-1012</a>. Support for cluster specific path entries in ldap for hdfsproxy
    (Srikanth Sundarrajan via Nicholas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1011">HDFS-1011</a>. Improve Logging in HDFSProxy to include cluster name associated
    with the request (Srikanth Sundarrajan via Nicholas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1010">HDFS-1010</a>. Retrieve group information from UnixUserGroupInformation 
    instead of LdapEntry (Srikanth Sundarrajan via Nicholas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-481">HDFS-481</a>. Bug fix - hdfsproxy: Stack overflow + Race conditions
    (Srikanth Sundarrajan via Nicholas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1657">MAPREDUCE-1657</a>. After task logs directory is deleted, tasklog servlet
    displays wrong error message about job ACLs. (Ravi Gummadi via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1692">MAPREDUCE-1692</a>. Remove TestStreamedMerge from the streaming tests.
    (Amareshwari Sriramadasu and Sreekanth Ramakrishnan via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1081">HDFS-1081</a>. Performance regression in 
    DistributedFileSystem::getFileBlockLocations in secure systems (jhoman)
    
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1656">MAPREDUCE-1656</a>. JobStory should provide queue info. (htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1317">MAPREDUCE-1317</a>. Reducing memory consumption of rumen objects. (htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1317">MAPREDUCE-1317</a>. Reverting the patch since it caused build failures. (htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1683">MAPREDUCE-1683</a>. Fixed jobtracker web-ui to correctly display heap-usage.
    (acmurthy)
    
    <a href="https://issues.apache.org/jira/browse/HADOOP-6706">HADOOP-6706</a>. Fixes exception handling for saslConnect. The ideal
    solution is to the Refreshable interface but as Owen noted in 
    <a href="https://issues.apache.org/jira/browse/HADOOP-6656">HADOOP-6656</a>, it doesn't seem to work as expected. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1617">MAPREDUCE-1617</a>. TestBadRecords failed once in our test runs. (Amar
    Kamat via vinodkv).

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-587.">MAPREDUCE-587.</a> Stream test TestStreamingExitStatus fails with Out of
    Memory. (Amar Kamat via vinodkv).

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1096">HDFS-1096</a>. Reverting the patch since it caused build failures. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1317">MAPREDUCE-1317</a>. Reducing memory consumption of rumen objects. (htang)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1680">MAPREDUCE-1680</a>. Add a metric to track number of heartbeats processed by the
    JobTracker. (Richard King via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1683">MAPREDUCE-1683</a>.  Removes JNI calls to get jvm current/max heap usage in
    ClusterStatus by default. (acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6687">HADOOP-6687</a>.  user object in the subject in UGI should be reused in case 
    of a relogin. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5647">HADOOP-5647</a>. TestJobHistory fails if /tmp/_logs is not writable to. 
    Testcase should not depend on /tmp. (Ravi Gummadi via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-181.">MAPREDUCE-181.</a> Bug fix for Secure job submission. (Ravi Gummadi via 
    vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1635">MAPREDUCE-1635</a>. ResourceEstimator does not work after <a href="https://issues.apache.org/jira/browse/MAPREDUCE-842.">MAPREDUCE-842.</a> 
    (Amareshwari Sriramadasu via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1526">MAPREDUCE-1526</a>. Cache the job related information while submitting the 
    job. (rksingh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6674">HADOOP-6674</a>. Turn off SASL checksums for RPCs. (jitendra via omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5958">HADOOP-5958</a>. Replace fork of DF with library call. (cdouglas via omalley)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-999">HDFS-999</a>.  Secondary namenode should login using kerberos if security
    is configured. Bugfix to original patch. (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1594">MAPREDUCE-1594</a>. Support for SleepJobs in Gridmix (rksingh)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1007">HDFS-1007</a>. Fix. ServiceName for delegation token for Hftp has hftp
    port and not RPC port. 
    
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1376">MAPREDUCE-1376</a>. Support for varied user submissions in Gridmix (rksingh)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1080">HDFS-1080</a>.  SecondaryNameNode image transfer should use the defined 
    http address rather than local ip address (jhoman)
    
    <a href="https://issues.apache.org/jira/browse/HADOOP-6661">HADOOP-6661</a>. User document for UserGroupInformation.doAs for secure
    impersonation. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1624">MAPREDUCE-1624</a>. Documents the job credentials and associated details 
    to do with delegation tokens (ddas)
    <a href="https://issues.apache.org/jira/browse/HDFS-1036">HDFS-1036</a>. Documentation for fetchdt for forrest (boryas)
    <a href="https://issues.apache.org/jira/browse/HDFS-1039">HDFS-1039</a>. New patch on top of previous patch. Gets namenode address
    from conf. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6656">HADOOP-6656</a>. Renew Kerberos TGT when 80% of the renew lifetime has been
    used up. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6653">HADOOP-6653</a>. Protect against NPE in setupSaslConnection when real user is
    null. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6649">HADOOP-6649</a>. An error in the previous committed patch. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6652">HADOOP-6652</a>. ShellBasedUnixGroupsMapping shouldn't have a cache. 
    (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6649">HADOOP-6649</a>. login object in UGI should be inside the subject
    (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6637">HADOOP-6637</a>.  Benchmark overhead of RPC session establishment
    (shv via jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6648">HADOOP-6648</a>. Credentials must ignore null tokens that can be generated
    when using HFTP to talk to insecure clusters. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6632">HADOOP-6632</a>. Fix on JobTracker to reuse filesystem handles if possible.
    (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6647">HADOOP-6647</a>. balancer fails with "is not authorized for protocol 
    interface NamenodeProtocol" in secure environment (boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1612">MAPREDUCE-1612</a>. job conf file is not accessible from job history 
    web page. (Ravi Gummadi via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1611">MAPREDUCE-1611</a>. Refresh nodes and refresh queues doesnt work with 
    service authorization enabled. (Amar Kamat via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6644">HADOOP-6644</a>. util.Shell getGROUPS_FOR_USER_COMMAND method 
   name - should use common naming convention (boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1609">MAPREDUCE-1609</a>. Fixes a problem with localization of job log
    directories when tasktracker is re-initialized that can result
    in failed tasks. (Amareshwari Sriramadasu via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1610">MAPREDUCE-1610</a>. Update forrest documentation for directory
    structure of localized files. (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1532">MAPREDUCE-1532</a>. Fixes a javadoc and an exception message in JobInProgress
    when the authenticated user is different from the user in conf. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1417">MAPREDUCE-1417</a>. Update forrest documentation for private
    and public distributed cache files. (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6634">HADOOP-6634</a>. AccessControlList uses full-principal names to verify acls
    causing queue-acls to fail (vinodkv)
    
    <a href="https://issues.apache.org/jira/browse/HADOOP-6642">HADOOP-6642</a>. Fix javac, javadoc, findbugs warnings. (chrisdo via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1044">HDFS-1044</a>.  Cannot submit mapreduce job from secure client to 
    unsecure sever. (boryas)
    <a href="https://issues.apache.org/jira/browse/HADOOP-6638">HADOOP-6638</a>. try to relogin in a case of failed RPC connection 
    (expired tgt) only in case the subject is loginUser or  
    proxyUgi.realUser. (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6632">HADOOP-6632</a>. Support for using different Kerberos keys for different 
    instances of Hadoop services. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6526">HADOOP-6526</a>. Need mapping from long principal names to local OS 
    user names. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1604">MAPREDUCE-1604</a>. Update Forrest documentation for job authorization
    ACLs. (Amareshwari Sriramadasu via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1045">HDFS-1045</a>.  In secure clusters, re-login is necessary for https 
    clients before opening connections (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6603">HADOOP-6603</a>.  Addition to original patch to be explicit
    about new method not being for general use. (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1543">MAPREDUCE-1543</a>. Add audit log messages for job and queue
    access control checks. (Amar Kamat via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1606">MAPREDUCE-1606</a>. Fixed occassinal timeout in TestJobACL. (Ravi Gummadi via
    acmurthy)

<li><a href="https://issues.apache.org/jira/browse/HADOOP-6633">HADOOP-6633</a>. normalize property names for JT/NN kerberos principal 
    names in configuration. (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6613">HADOOP-6613</a>. Changes the RPC server so that version is checked first
    on an incoming connection. (Kan Zhang via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5592">HADOOP-5592</a>. Fix typo in Streaming doc in reference to GzipCodec.
    (Corinne Chandel via tomwhite)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-813.">MAPREDUCE-813.</a> Updates Streaming and M/R tutorial documents.
    (Corinne Chandel via ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-927.">MAPREDUCE-927.</a> Cleanup of task-logs should happen in TaskTracker instead
    of the Child. (Amareshwari Sriramadasu via vinodkv)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1039">HDFS-1039</a>. Service should be set in the token in JspHelper.getUGI.
    (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1599">MAPREDUCE-1599</a>. MRBench reuses jobConf and credentials there in.
    (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1522">MAPREDUCE-1522</a>. FileInputFormat may use the default FileSystem for the
    input path. (Tsz Wo (Nicholas), SZE via cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1036">HDFS-1036</a>. In DelegationTokenFetch pass Configuration object so 
    getDefaultUri will work correctly.

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1038">HDFS-1038</a>. In nn_browsedfscontent.jsp fetch delegation token only if 
    security is enabled. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1036">HDFS-1036</a>. in DelegationTokenFetch dfs.getURI returns no port (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6598">HADOOP-6598</a>. Verbose logging from the Group class (one more case)
    (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6627">HADOOP-6627</a>. Bad Connection to FS" message in FSShell should print 
    message from the exception (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1033">HDFS-1033</a>. In secure clusters, NN and SNN should verify that the remote 
    principal during image and edits transfer (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1005">HDFS-1005</a>. Fixes a bug to do with calling the cross-realm API in Fsck
    client. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1422">MAPREDUCE-1422</a>. Fix cleanup of localized job directory to work if files
    with non-deletable permissions are created within it.
    (Amar Kamat via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1007">HDFS-1007</a>. Fixes bugs to do with 20S cluster talking to 20 over 
    hftp (borya)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1566">MAPREDUCE-1566</a>. Fixes bugs in the earlier patch. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-992">HDFS-992</a>. A bug in backport for <a href="https://issues.apache.org/jira/browse/HDFS-992">HDFS-992</a>. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6598">HADOOP-6598</a>. Remove verbose logging from the Groups class. (borya)
    <a href="https://issues.apache.org/jira/browse/HADOOP-6620">HADOOP-6620</a>. NPE if renewer is passed as null in getDelegationToken.
    (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1023">HDFS-1023</a>. Second Update to original patch to fix username (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1435">MAPREDUCE-1435</a>. Add test cases to already committed patch for this
    jira, synchronizing changes with trunk. (yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6612">HADOOP-6612</a>. Protocols RefreshUserToGroupMappingsProtocol and 
    RefreshAuthorizationPolicyProtocol  authorization settings thru 
    KerberosInfo (boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1566">MAPREDUCE-1566</a>. Bugfix for tests on top of the earlier patch. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1566">MAPREDUCE-1566</a>. Mechanism to import tokens and secrets from a file in to
    the submitted job. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6603">HADOOP-6603</a>. Provide workaround for issue with Kerberos not
    resolving corss-realm principal. (kan via jhoman)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1023">HDFS-1023</a>. Update to original patch to fix username (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-814">HDFS-814</a>. Add an api to get the visible length of a 
    DFSDataInputStream. (hairong)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1023">HDFS-1023</a>. Allow http server to start as regular user if https
    principal is not defined. (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1022">HDFS-1022</a>. Merge all three test specs files (common, hdfs, mapred)
    into one. (steffl)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-101">HDFS-101</a>. DFS write pipeline: DFSClient sometimes does not detect
    second datanode failure. (hairong)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1015">HDFS-1015</a>. Intermittent failure in TestSecurityTokenEditLog. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1550">MAPREDUCE-1550</a>. A bugfix on top of what was committed earlier (ddas).

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1155">MAPREDUCE-1155</a>. DISABLING THE TestStreamingExitStatus temporarily. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1020">HDFS-1020</a>. Changes the check for renewer from short name to long name
    in the cancel/renew delegation token methods. (jitendra via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1019">HDFS-1019</a>. Fixes values of delegation token parameters in
    hdfs-default.xml. (jitendra via ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1430">MAPREDUCE-1430</a>. Fixes a backport issue with the earlier patch. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1559">MAPREDUCE-1559</a>. Fixes a problem in DelegationTokenRenewal class to
    do with using the right credentials when talking to the NameNode.(ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1550">MAPREDUCE-1550</a>. Fixes a problem to do with creating a filesystem using
    the user's UGI in the JobHistory browsing. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6609">HADOOP-6609</a>. Fix UTF8 to use a thread local DataOutputBuffer instead of
    a static that was causing a deadlock in RPC. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6584">HADOOP-6584</a>. Fix javadoc warnings introduced by original <a href="https://issues.apache.org/jira/browse/HADOOP-6584">HADOOP-6584</a>
    patch (jhoman)
    
    <a href="https://issues.apache.org/jira/browse/HDFS-1017">HDFS-1017</a>. browsedfs jsp should call JspHelper.getUGI rather than using 
    createRemoteUser(). (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-899.">MAPREDUCE-899.</a> Modified LinuxTaskController to check that task-controller
    has right permissions and ownership before performing any actions.
    (Amareshwari Sriramadasu via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-204">HDFS-204</a>. Revive number of files listed metrics. (hairong)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6569">HADOOP-6569</a>. FsShell#cat should avoid calling uneccessary getFileStatus
    before opening a file to read. (hairong)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1014">HDFS-1014</a>. Error in reading delegation tokens from edit logs. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-458">HDFS-458</a>. Add under-10-min tests from 0.22 to 0.20.1xx, only the tests
    that already exist in 0.20.1xx (steffl)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1155">MAPREDUCE-1155</a>. Just pulls out the TestStreamingExitStatus part of the
    patch from jira (that went to 0.22). (ddas)
 
    <a href="https://issues.apache.org/jira/browse/HADOOP-6600">HADOOP-6600</a>. Fix for branch backport only. Comparing of user should use
    equals. (boryas).

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1006">HDFS-1006</a>. Fixes NameNode and SecondaryNameNode to use kerberizedSSL for
    the http communication. (Jakob Homan via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1007">HDFS-1007</a>. Fixes a bug on top of the earlier patch. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1005">HDFS-1005</a>. Fsck security. Makes it work over kerberized SSL (boryas and 
    jhoman)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1007">HDFS-1007</a>. Makes HFTP and Distcp use kerberized SSL. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1455">MAPREDUCE-1455</a>. Fixes a testcase in the earlier patch. 
    (Ravi Gummadi via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-992">HDFS-992</a>. Refactors block access token implementation to conform to the 
    generic Token interface. (Kan Zhang via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6584">HADOOP-6584</a>. Adds KrbSSL connector for jetty. (Jakob Homan via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6589">HADOOP-6589</a>. Add a framework for better error messages when rpc connections
    fail to authenticate. (Kan Zhang via omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6600">HADOOP-6600</a>,<a href="https://issues.apache.org/jira/browse/HDFS-1003,<a href="https://issues">HDFS-1003,<a href="https://issues</a>.apache.org/jira/browse/MAPREDUCE-1539">MAPREDUCE-1539</a>. mechanism for authorization check
    for inter-server protocols(boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6580">HADOOP-6580</a>,<a href="https://issues.apache.org/jira/browse/HDFS-993,<a href="https://issues">HDFS-993,<a href="https://issues</a>.apache.org/jira/browse/MAPREDUCE-1516">MAPREDUCE-1516</a>. UGI should contain authentication 
    method.

<li> Namenode and JT should issue a delegation token only for kerberos 
    authenticated  clients. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-984,<a href="https://issues">HDFS-984,<a href="https://issues</a>.apache.org/jira/browse/HADOOP-6573">HADOOP-6573</a>,<a href="https://issues.apache.org/jira/browse/MAPREDUCE-1537">MAPREDUCE-1537</a>. Delegation Tokens should be persisted
    in Namenode, and corresponding changes in common and mr. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-994">HDFS-994</a>. Provide methods for obtaining delegation token from Namenode for 
    hftp and other uses. Incorporates <a href="https://issues.apache.org/jira/browse/HADOOP-6594">HADOOP-6594</a>: Update hdfs script to 
    provide fetchdt tool. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6586">HADOOP-6586</a>. Log authentication and authorization failures and successes
    (boryas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-991">HDFS-991</a>. Allow use of delegation tokens to authenticate to the 
    HDFS servlets. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-1849">HADOOP-1849</a>. Add undocumented configuration parameter for per handler 
    call queue size in IPC Server. (shv)
    
    <a href="https://issues.apache.org/jira/browse/HADOOP-6599">HADOOP-6599</a>. Split existing RpcMetrics with summary in RpcMetrics and
    details information in RpcDetailedMetrics. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-985">HDFS-985</a>. HDFS should issue multiple RPCs for listing a large directory.
    (hairong)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-1000">HDFS-1000</a>. Updates libhdfs to use the new UGI. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1532">MAPREDUCE-1532</a>. Ensures all filesystem operations at the client is done
    as the job submitter. Also, changes the renewal to maintain list of tokens
    to renew. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6596">HADOOP-6596</a>. Add a version field to the seialization of the 
    AbstractDelegationTokenIdentifier. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5561">HADOOP-5561</a>. Add javadoc.maxmemory to build.xml to allow larger memory.
    (jkhoman via omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6579">HADOOP-6579</a>. Add a mechanism for encoding and decoding Tokens in to
    url-safe strings. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1354">MAPREDUCE-1354</a>. Make incremental changes in jobtracker for
    improving scalability (acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-999">HDFS-999</a>.Secondary namenode should login using kerberos if security
    is configured(boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1466">MAPREDUCE-1466</a>. Added a private configuration variable 
    mapreduce.input.num.files, to store number of input files 
    being processed by M/R job. (Arun Murthy via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1403">MAPREDUCE-1403</a>. Save file-sizes of each of the artifacts in 
    DistributedCache in the JobConf (Arun Murthy via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6543">HADOOP-6543</a>. Fixes a compilation problem in the original commit. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1520">MAPREDUCE-1520</a>. Moves a call to setWorkingDirectory in Child to within
    a doAs block. (Amareshwari Sriramadasu via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6543">HADOOP-6543</a>. Allows secure clients to talk to unsecure clusters. 
    (Kan Zhang via ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1505">MAPREDUCE-1505</a>. Delays construction of the job client until it is really
    required. (Arun C Murthy via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6549">HADOOP-6549</a>. TestDoAsEffectiveUser should use ip address of the host
    for superuser ip check. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-464">HDFS-464</a>. Fix memory leaks in libhdfs. (Christian Kunz via suresh)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-946">HDFS-946</a>. NameNode should not return full path name when lisitng a
    diretory or getting the status of a file. (hairong)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1398">MAPREDUCE-1398</a>. Fix TaskLauncher to stop waiting for slots on a TIP 
    that is killed / failed. (Amareshwari Sriramadasu via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1476">MAPREDUCE-1476</a>. Fix the M/R framework to not call commit for special 
    tasks like job setup/cleanup and task cleanup.
    (Amareshwari Sriramadasu via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6467">HADOOP-6467</a>.  Performance improvement for liststatus on directories in
    hadoop archives. (mahadev)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6558">HADOOP-6558</a>. archive does not work with distcp -update. (nicholas via
    mahadev)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6583">HADOOP-6583</a>. Captures authentication and authorization metrics. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1316">MAPREDUCE-1316</a>. Fixes a memory leak of TaskInProgress instances in
    the jobtracker. (Amar Kamat via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-670.">MAPREDUCE-670.</a> Creates ant target for 10 mins patch test build.
    (Jothi Padmanabhan via gkesavan)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1430">MAPREDUCE-1430</a>. JobTracker should be able to renew delegation tokens 
    for the jobs(boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6551">HADOOP-6551</a>, <a href="https://issues.apache.org/jira/browse/HDFS-986, <a href="https://issues">HDFS-986, <a href="https://issues</a>.apache.org/jira/browse/MAPREDUCE-1503">MAPREDUCE-1503</a>. Change API for tokens to throw
    exceptions instead of returning booleans. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6545">HADOOP-6545</a>. Changes the Key for the FileSystem to be UGI. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6572">HADOOP-6572</a>. Makes sure that SASL encryption and push to responder queue 
    for the RPC response happens atomically. (Kan Zhang via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-965">HDFS-965</a>. Split the HDFS TestDelegationToken into two tests, of which
    one proxy users and the other normal users. (jitendra via omalley)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6560">HADOOP-6560</a>. HarFileSystem throws NPE for har://hdfs-/foo (nicholas via
    mahadev)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-686.">MAPREDUCE-686.</a> Move TestSpeculativeExecution.Fake* into a separate class
    so that it can be used by other tests. (Jothi Padmanabhan via sharad)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-181.">MAPREDUCE-181.</a> Fixes an issue in the use of the right config. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1026">MAPREDUCE-1026</a>. Fixes a bug in the backport. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6559">HADOOP-6559</a>. Makes the RPC client automatically re-login when the SASL 
    connection setup fails. This is applicable to only keytab based logins. 
    (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-2141">HADOOP-2141</a>. Backport changes made in the original JIRA to aid
    fast unit tests in Map/Reduce. (Amar Kamat via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6382">HADOOP-6382</a>.  Import the mavenizable pom file structure and adjust
    the build targets and bin scripts. (gkesvan via ltucker)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1425">MAPREDUCE-1425</a>. archive throws OutOfMemoryError (mahadev) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1399">MAPREDUCE-1399</a>. The archive command shows a null error message. (nicholas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6552">HADOOP-6552</a>. Puts renewTGT=true and useTicketCache=true for the keytab 
    kerberos options. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1433">MAPREDUCE-1433</a>. Adds delegation token for MapReduce (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4359">HADOOP-4359</a>. Fixes a bug in the earlier backport. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6547">HADOOP-6547</a>, <a href="https://issues.apache.org/jira/browse/HDFS-949, <a href="https://issues">HDFS-949, <a href="https://issues</a>.apache.org/jira/browse/MAPREDUCE-1470">MAPREDUCE-1470</a>. Move Delegation token into Common 
    so that we can use it for MapReduce also. It is a combined patch for 
    common, hdfs and mr. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6510">HADOOP-6510</a>,<a href="https://issues.apache.org/jira/browse/HDFS-935,<a href="https://issues">HDFS-935,<a href="https://issues</a>.apache.org/jira/browse/MAPREDUCE-1464">MAPREDUCE-1464</a>. Support for doAs to allow 
    authenticated superuser to impersonate proxy users. It is a combined 
    patch with compatible fixes in HDFS and MR. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1435">MAPREDUCE-1435</a>. Fixes the way symlinks are handled when cleaning up
    work directory files. (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-6419">MAPREDUCE-6419</a>. Fixes a bug in the backported patch. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1457">MAPREDUCE-1457</a>. Fixes JobTracker to get the FileSystem object within 
    getStagingAreaDir within a privileged block. Fixes Child.java to use the
    appropriate UGIs while getting the TaskUmbilicalProtocol proxy and while
    executing the task. Contributed by Jakob Homan. (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1440">MAPREDUCE-1440</a>. Replace the long user name in MapReduce with the local
    name. (ddas) 

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6419">HADOOP-6419</a>. Adds SASL based authentication to RPC. Also includes the 
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1335">MAPREDUCE-1335</a> and <a href="https://issues.apache.org/jira/browse/HDFS-933 patches">HDFS-933 patches</a>. Contributed by Kan Zhang. 
    (ddas)
 
    <a href="https://issues.apache.org/jira/browse/HADOOP-6538">HADOOP-6538</a>. Sets hadoop.security.authentication to simple by default.
    (ddas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-938">HDFS-938</a>.  Replace calls to UGI.getUserName() with 
    UGI.getShortUserName()(boryas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6544">HADOOP-6544</a>. fix ivy settings to include JSON jackson.codehause.org
     libs for .20 (boryas)
     
    <a href="https://issues.apache.org/jira/browse/HDFS-907">HDFS-907</a>. Add tests for getBlockLocations and totalLoad metrics. (rphulari)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6204">HADOOP-6204</a>. Implementing aspects development and fault injeciton
    framework for Hadoop (cos)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1432">MAPREDUCE-1432</a>. Adds hooks in the jobtracker and tasktracker
    for loading the tokens in the user's ugi. This is required for
    the copying of files from the hdfs. (Devaraj Das vi boryas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1383">MAPREDUCE-1383</a>. Automates fetching of delegation tokens in File*Formats
    Distributed Cache and Distcp. Also, provides a config 
    mapreduce.job.hdfs-servers that the jobs can populate with a comma 
    separated list of namenodes. The job client automatically fetches 
    delegation tokens from those namenodes.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6337">HADOOP-6337</a>. Update FilterInitializer class to be more visible
    and take a conf for further development. (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6520">HADOOP-6520</a>. UGI should load tokens from the environment. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6517">HADOOP-6517</a>, <a href="https://issues.apache.org/jira/browse/HADOOP-6518">HADOOP-6518</a>. Ability to add/get tokens from 
    UserGroupInformation & Kerberos login in UGI should honor KRB5CCNAME
    (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6299">HADOOP-6299</a>. Reimplement the UserGroupInformation to use the OS
    specific and Kerberos JAAS login. (jhoman, ddas, oom)
    
    <a href="https://issues.apache.org/jira/browse/HADOOP-6524">HADOOP-6524</a>. Contrib tests are failing Clover'ed build. (cos)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-842.">MAPREDUCE-842.</a> Fixing a bug in the earlier version of the patch
    related to improper localization of the job token file.
    (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-919">HDFS-919</a>. Create test to validate the BlocksVerified metric (Gary Murry
    via cos)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1186">MAPREDUCE-1186</a>. Modified code in distributed cache to set 
    permissions only on required set of localized paths.
    (Amareshwari Sriramadasu via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-899">HDFS-899</a>. Delegation Token Implementation. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-896.">MAPREDUCE-896.</a> Enhance tasktracker to cleanup files that might have 
    been created by user tasks with non-writable permissions. 
    (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5879">HADOOP-5879</a>. Read compression level and strategy from Configuration for
    gzip compression. (He Yongqiang via cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6161">HADOOP-6161</a>. Add get/setEnum methods to Configuration. (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6382">HADOOP-6382</a> Mavenize the build.xml targets and update the bin scripts
    in preparation for publishing POM files (giri kesavan via ltucker)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-737">HDFS-737</a>. Add full path name of the file to the block information and 
    summary of total number of files, blocks, live and deadnodes to 
    metasave output. (Jitendra Nath Pandey via suresh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6577">HADOOP-6577</a>. Add hidden configuration option "ipc.server.max.response.size"
    to change the default 1 MB, the maximum size when large IPC handler 
    response buffer is reset. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6521">HADOOP-6521</a>. Fix backward compatiblity issue with umask when applications 
    use deprecated param dfs.umask in configuration or use 
    FsPermission.setUMask(). (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-737">HDFS-737</a>. Add full path name of the file to the block information and 
    summary of total number of files, blocks, live and deadnodes to 
    metasave output. (Jitendra Nath Pandey via suresh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6521">HADOOP-6521</a>. Fix backward compatiblity issue with umask when applications 
    use deprecated param dfs.umask in configuration or use 
    FsPermission.setUMask(). (suresh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-433.">MAPREDUCE-433.</a> Use more reliable counters in TestReduceFetch.
    (Christopher Douglas via ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-744.">MAPREDUCE-744.</a> Introduces the notion of a public distributed cache.
    (ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1140">MAPREDUCE-1140</a>. Fix DistributedCache to not decrement reference counts 
    for unreferenced files in error conditions.    
    (Amareshwari Sriramadasu via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1284">MAPREDUCE-1284</a>. Fix fts_open() call in task-controller that was failing 
    LinuxTaskController unit tests. (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1098">MAPREDUCE-1098</a>. Fixed the distributed-cache to not do i/o while 
    holding a global lock.
    (Amareshwari Sriramadasu via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1338">MAPREDUCE-1338</a>. Introduces the notion of token cache using which 
    tokens and secrets can be sent by the Job client to the JobTracker.
    (Boris Shkolnik)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6495">HADOOP-6495</a>. Identifier should be serialized after the password is created
    In Token constructor. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6506">HADOOP-6506</a>. Failing tests prevent the rest of test targets from
    execution. (cos)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5457">HADOOP-5457</a>. Fix to continue to run builds even if contrib test fails.
    (gkesavan)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-856.">MAPREDUCE-856.</a> Setup secure permissions for distributed cache files.
    (Vinod Kumar Vavilapalli via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-871.">MAPREDUCE-871.</a> Fix ownership of Job/Task local files to have correct 
    group ownership according to the egid of the tasktracker.
    (Vinod Kumar Vavilapalli via yhemanth)
    
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-476.">MAPREDUCE-476.</a> Extend DistributedCache to work locally (LocalJobRunner). 
    (Philip Zeyliger via tomwhite)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-711.">MAPREDUCE-711.</a> Removed Distributed Cache from Common, to move it under 
    Map/Reduce. (Vinod Kumar Vavilapalli via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-478.">MAPREDUCE-478.</a> Allow map and reduce jvm parameters, environment 
    variables and ulimit to be set separately. (acmurthy)
 
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-842.">MAPREDUCE-842.</a> Setup secure permissions for localized job files, 
    intermediate outputs and log files on tasktrackers.
    (Vinod Kumar Vavilapalli via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-408.">MAPREDUCE-408.</a> Fixes an assertion problem in TestKillSubProcesses.
    (Ravi Gummadi via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4041">HADOOP-4041</a>. IsolationRunner does not work as documented.
    (Philip Zeyliger via tomwhite)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-181.">MAPREDUCE-181.</a> Changes the job submission process to be secure.
    (Devaraj Das)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5737">HADOOP-5737</a>. Fixes a problem in the way the JobTracker used to talk to 
    other daemons like the NameNode to get the job's files. Also adds APIs 
    in the JobTracker to get the FileSystem objects as per the JobTracker's 
    configuration. (Amar Kamat via ddas)
 
    <a href="https://issues.apache.org/jira/browse/HADOOP-5771">HADOOP-5771</a>. Implements unit tests for LinuxTaskController.
    (Sreekanth Ramakrishnan and Vinod Kumar Vavilapalli via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4656">HADOOP-4656</a>, <a href="https://issues.apache.org/jira/browse/HDFS-685, <a href="https://issues">HDFS-685, <a href="https://issues</a>.apache.org/jira/browse/MAPREDUCE-1083">MAPREDUCE-1083</a>. Use the user-to-groups mapping 
    service in the NameNode and JobTracker. Combined patch for these 3 jiras 
    otherwise tests fail. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1250">MAPREDUCE-1250</a>. Refactor job token to use a common token interface.
    (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1026">MAPREDUCE-1026</a>. Shuffle should be secure. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4268">HADOOP-4268</a>. Permission checking in fsck. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6415">HADOOP-6415</a>. Adding a common token interface for both job token and 
    delegation token. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6367">HADOOP-6367</a>, <a href="https://issues.apache.org/jira/browse/HDFS-764">HDFS-764</a>. Moving Access Token implementation from Common to 
    HDFS. These two jiras must be committed together otherwise build will
    fail. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-409">HDFS-409</a>. Add more access token tests
    (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6132">HADOOP-6132</a>. RPC client opens an extra connection for VersionedProtocol.
    (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-445">HDFS-445</a>. pread() fails when cached block locations are no longer valid.
    (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-195">HDFS-195</a>. Need to handle access token expiration when re-establishing the 
    pipeline for dfs write. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6176">HADOOP-6176</a>. Adding a couple private methods to AccessTokenHandler 
    for testing purposes. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5824">HADOOP-5824</a>. remove OP_READ_METADATA functionality from Datanode.
    (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4359">HADOOP-4359</a>. Access Token: Support for data access authorization 
    checking on DataNodes. (Jitendra Nath Pandey)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1372">MAPREDUCE-1372</a>. Fixed a ConcurrentModificationException in jobtracker.
    (Arun C Murthy via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1316">MAPREDUCE-1316</a>. Fix jobs' retirement from the JobTracker to prevent memory
    leaks via stale references. (Amar Kamat via acmurthy)  

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1342">MAPREDUCE-1342</a>. Fixed deadlock in global blacklisting of tasktrackers. 
    (Amareshwari Sriramadasu via acmurthy)  

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6460">HADOOP-6460</a>. Reinitializes buffers used for serializing responses in ipc
    server on exceeding maximum response size to free up Java heap. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1100">MAPREDUCE-1100</a>. Truncate user logs to prevent TaskTrackers' disks from
    filling up. (Vinod Kumar Vavilapalli via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1143">MAPREDUCE-1143</a>. Fix running task counters to be updated correctly
    when speculative attempts are running for a TIP.
    (Rahul Kumar Singh via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6151">HADOOP-6151</a>, 6281, 6285,  6441. Add HTML quoting of the parameters to all
    of the servlets to prevent XSS attacks. (omalley)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-896.">MAPREDUCE-896.</a> Fix bug in earlier implementation to prevent
    spurious logging in tasktracker logs for absent file paths.
    (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-676.">MAPREDUCE-676.</a> Fix Hadoop Vaidya to ensure it works for map-only jobs. 
    (Suhas Gogate via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5582">HADOOP-5582</a>. Fix Hadoop Vaidya to use new Counters in
    org.apache.hadoop.mapreduce package. (Suhas Gogate via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/HDFS-595">HDFS-595</a>.  umask settings in configuration may now use octal or 
    symbolic instead of decimal.  Update HDFS tests as such.  (jghoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1068">MAPREDUCE-1068</a>. Added a verbose error message when user specifies an
    incorrect -file parameter. (Amareshwari Sriramadasu via acmurthy)  

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1171">MAPREDUCE-1171</a>. Allow the read-error notification in shuffle to be
    configurable. (Amareshwari Sriramadasu via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-353.">MAPREDUCE-353.</a> Allow shuffle read and connection timeouts to be
    configurable. (Amareshwari Sriramadasu via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/HDFS-781">HDFS-781</a>. Namenode metrics PendingDeletionBlocks is not decremented. 
    (suresh)
 
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1185">MAPREDUCE-1185</a>. Redirect running job url to history url if job is already 
    retired. (Amareshwari Sriramadasu and Sharad Agarwal via sharad)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-754.">MAPREDUCE-754.</a> Fix NPE in expiry thread when a TT is lost. (Amar Kamat 
    via sharad)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-896.">MAPREDUCE-896.</a> Modify permissions for local files on tasktracker before
    deletion so they can be deleted cleanly. (Ravi Gummadi via yhemanth)
 
    <a href="https://issues.apache.org/jira/browse/HADOOP-5771">HADOOP-5771</a>. Implements unit tests for LinuxTaskController.
    (Sreekanth Ramakrishnan and Vinod Kumar Vavilapalli via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1124">MAPREDUCE-1124</a>. Import Gridmix3 and Rumen. (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1063">MAPREDUCE-1063</a>. Document gridmix benchmark. (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-758">HDFS-758</a>. Changes to report status of decommissioining on the namenode web
    UI. (jitendra)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6234">HADOOP-6234</a>. Add new option dfs.umaskmode to set umask in configuration
    to use octal or symbolic instead of decimal. (Jakob Homan via suresh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1147">MAPREDUCE-1147</a>. Add map output counters to new API. (Amar Kamat via
    cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1182">MAPREDUCE-1182</a>. Fix overflow in reduce causing allocations to exceed the
    configured threshold. (cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4933">HADOOP-4933</a>. Fixes a ConcurrentModificationException problem that shows up
    when the history viewer is accessed concurrently.
    (Amar Kamat via ddas)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1140">MAPREDUCE-1140</a>. Fix DistributedCache to not decrement reference counts for 
    unreferenced files in error conditions.
    (Amareshwari Sriramadasu via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6203">HADOOP-6203</a>. FsShell rm/rmr error message indicates exceeding Trash quota
    and suggests using -skpTrash, when moving to trash fails.
    (Boris Shkolnik via suresh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5675">HADOOP-5675</a>. Do not launch a job if DistCp has no work to do. (Tsz Wo
    (Nicholas), SZE via cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-457">HDFS-457</a>. Better handling of volume failure in Data Node storage,
    This fix is a port from hdfs-0.22 to common-0.20 by Boris Shkolnik.
    Contributed by Erik Steffl

<li> <a href="https://issues.apache.org/jira/browse/HDFS-625">HDFS-625</a>. Fix NullPointerException thrown from ListPathServlet. 
    Contributed by Suresh Srinivas.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6343">HADOOP-6343</a>. Log unexpected throwable object caught in RPC.  
    Contributed by Jitendra Nath Pandey

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1186">MAPREDUCE-1186</a>. Fixed DistributedCache to do a recursive chmod on just the
    per-cache directory, not all of mapred.local.dir.
    (Amareshwari Sriramadasu via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1231">MAPREDUCE-1231</a>. Add an option to distcp to ignore checksums when used with
    the upgrade option.
    (Jothi Padmanabhan via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1219">MAPREDUCE-1219</a>. Fixed JobTracker to not collect per-job metrics, thus
    easing load on it. (Amareshwari Sriramadasu via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-761">HDFS-761</a>. Fix failure to process rename operation from edits log due to
    quota verification. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1196">MAPREDUCE-1196</a>. Fix FileOutputCommitter to use the deprecated cleanupJob
    api correctly. (acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6344">HADOOP-6344</a>.  rm and rmr immediately delete files rather than sending
    to trash, despite trash being enabled, if a user is over-quota. (jhoman)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1160">MAPREDUCE-1160</a>. 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)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-587">HDFS-587</a>. Add ability to run HDFS with MR test on non-default queue,
    also updated junit dependendcy from junit-3.8.1 to junit-4.5 (to make
    it possible to use Configured and Tool to process command line to
    be able to specify a queue). Contributed by Erik Steffl.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1158">MAPREDUCE-1158</a>. Fix JT running maps and running reduces metrics.
    (sharad)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-947.">MAPREDUCE-947.</a> Fix bug in earlier implementation that was
    causing unit tests to fail.
    (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1062">MAPREDUCE-1062</a>. Fix MRReliabilityTest to work with retired jobs
    (Contributed by Sreekanth Ramakrishnan)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1090">MAPREDUCE-1090</a>. Modified log statement in TaskMemoryManagerThread to
    include task attempt id. (yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1098">MAPREDUCE-1098</a>. Fixed the distributed-cache to not do i/o while
    holding a global lock. (Amareshwari Sriramadasu via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1048">MAPREDUCE-1048</a>. Add occupied/reserved slot usage summary on
    jobtracker UI. (Amareshwari Sriramadasu via sharad)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1103">MAPREDUCE-1103</a>. Added more metrics to Jobtracker. (sharad)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-947.">MAPREDUCE-947.</a> Added commitJob and abortJob apis to OutputCommitter.
    Enhanced FileOutputCommitter to create a _SUCCESS file for successful
    jobs. (Amar Kamat & Jothi Padmanabhan via acmurthy) 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1105">MAPREDUCE-1105</a>. 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)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1086">MAPREDUCE-1086</a>. Setup Hadoop logging environment for tasks to point to
    task related parameters. (Ravi Gummadi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-739.">MAPREDUCE-739.</a> Allow relative paths to be created inside archives. 
    (mahadev)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6097">HADOOP-6097</a>. Multiple bugs w/ Hadoop archives (mahadev)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6231">HADOOP-6231</a>. Allow caching of filesystem instances to be disabled on a
    per-instance basis (ben slusky via mahadev)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-826.">MAPREDUCE-826.</a>  harchive doesn't use ToolRunner / harchive returns 0 even
    if the job fails with exception (koji via mahadev)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-686">HDFS-686</a>. NullPointerException is thrown while merging edit log and
    image. (hairong)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-709">HDFS-709</a>. Fix TestDFSShell failure due to rename bug introduced by 
    <a href="https://issues.apache.org/jira/browse/HDFS-677">HDFS-677</a>. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HDFS-677">HDFS-677</a>. Rename failure when both source and destination quota exceeds
    results in deletion of source. (suresh)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6284">HADOOP-6284</a>. Add a new parameter, HADOOP_JAVA_PLATFORM_OPTS, to
    hadoop-config.sh so that it allows setting java command options for
    JAVA_PLATFORM.  (Koji Noguchi via szetszwo)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-732.">MAPREDUCE-732.</a> Removed spurious log statements in the node
    blacklisting logic. (Sreekanth Ramakrishnan via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-144.">MAPREDUCE-144.</a> Includes dump of the process tree in task diagnostics when 
    a task is killed due to exceeding memory limits.
    (Vinod Kumar Vavilapalli via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-979.">MAPREDUCE-979.</a> Fixed JobConf APIs related to memory parameters to 
    return values of new configuration variables when deprecated 
    variables are disabled. (Sreekanth Ramakrishnan via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-277.">MAPREDUCE-277.</a> Makes job history counters available on the job history
    viewers. (Jothi Padmanabhan via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5625">HADOOP-5625</a>. Add operation duration to clienttrace. (Lei Xu 
    via cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5222">HADOOP-5222</a>. Add offset to datanode clienttrace. (Lei Xu via cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6218">HADOOP-6218</a>. Adds a feature where TFile can be split by Record
    Sequence number. Contributed by Hong Tang and Raghu Angadi.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1088">MAPREDUCE-1088</a>. Changed permissions on JobHistory files on local disk to
    0744. Contributed by Arun C. Murthy.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6304">HADOOP-6304</a>. Use java.io.File.set{Readable|Writable|Executable} where
    possible in RawLocalFileSystem. Contributed by Arun C. Murthy.
    
    <a href="https://issues.apache.org/jira/browse/MAPREDUCE-270.">MAPREDUCE-270.</a> Fix the tasktracker to optionally send an out-of-band
    heartbeat on task-completion for better job-latency. Contributed by
    Arun C. Murthy
    Configuration changes:
      add mapreduce.tasktracker.outofband.heartbeat

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1030">MAPREDUCE-1030</a>. Fix capacity-scheduler to assign a map and a reduce task
    per-heartbeat. Contributed by Rahuk K Singh.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-1028">MAPREDUCE-1028</a>. Fixed number of slots occupied by cleanup tasks to one
    irrespective of slot size for the job. Contributed by Ravi Gummadi. 

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-964.">MAPREDUCE-964.</a> Fixed start and finish times of TaskStatus to be
    consistent, thereby fixing inconsistencies in metering tasks.
    Contributed by Sreekanth Ramakrishnan.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5976">HADOOP-5976</a>. Add a new command, classpath, to the hadoop 
    script. Contributed by Owen O'Malley and Gary Murry

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5784">HADOOP-5784</a>. Makes the number of heartbeats that should arrive 
    a second at the JobTracker configurable. Contributed by 
    Amareshwari Sriramadasu.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-945.">MAPREDUCE-945.</a> Modifies MRBench and TestMapRed to use 
    ToolRunner so that options such as queue name can be 
    passed via command line. Contributed by Sreekanth Ramakrishnan.

<li> HADOOP:5420 Correct bug in earlier implementation
    by Arun C. Murthy

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5363">HADOOP-5363</a> Add support for proxying connections to multiple 
    clusters with different versions to hdfsproxy. Contributed 
    by Zhiyong Zhang

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5780">HADOOP-5780</a>. Improve per block message prited by -metaSave 
    in HDFS. (Raghu Angadi)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6227">HADOOP-6227</a>. Fix Configuration to allow final parameters to be set 
    to null and prevent them from being overridden. Contributed by 
    Amareshwari Sriramadasu.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-430 ">MAPREDUCE-430 </a> Added patch supplied by Amar Kamat to allow roll forward
    on branch to includ externally committed patch.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-768.">MAPREDUCE-768.</a> Provide an option to dump jobtracker configuration in 
    JSON format to standard output. Contributed by V.V.Chaitanya

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-834 ">MAPREDUCE-834 </a>Correct an issue created by merging this issue with
    patch attached to external Jira.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-6184">HADOOP-6184</a> Provide an API to dump Configuration in a JSON format. 
    Contributed by V.V.Chaitanya Krishna.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-745 ">MAPREDUCE-745 </a> Patch added for this issue to allow branch-0.20 to 
    merge cleanly.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-478 ">MAPREDUCE-478 </a>Allow map and reduce jvm parameters, environment 
    variables and ulimit to be set separately.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-682 ">MAPREDUCE-682 </a>Removes reservations on tasktrackers which are blacklisted. 
    Contributed by Sreekanth Ramakrishnan.

<li> HADOOP:5420 Support killing of process groups in LinuxTaskController 
    binary

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5488">HADOOP-5488</a> Removes the pidfile management for the Task JVM from the 
    framework and instead passes the PID back and forth between the 
    TaskTracker and the Task processes. Contributed by Ravi Gummadi.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-467 ">MAPREDUCE-467 </a>Provide ability to collect statistics about total tasks and 
    succeeded tasks in different time windows.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-817.">MAPREDUCE-817.</a> Add a cache for retired jobs with minimal job
    info and provide a way to access history file url

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-814.">MAPREDUCE-814.</a> Provide a way to configure completed job history
    files to be on HDFS.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-838 ">MAPREDUCE-838 </a>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. Contributed by Amareshwari Sriramadasu.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-809 ">MAPREDUCE-809 </a>Fix job-summary logs to correctly record final status of 
    FAILED and KILLED jobs.  

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-740 ">MAPREDUCE-740 </a>Log a job-summary at the end of a job, while
    allowing it to be configured to use a custom appender if desired.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-771 ">MAPREDUCE-771 </a>Fixes a bug which delays normal jobs in favor of
    high-ram jobs.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5420">HADOOP-5420</a> Support setsid based kill in LinuxTaskController.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-733 ">MAPREDUCE-733 </a>Fixes a bug that when a task tracker is killed ,
    it throws exception. Instead it should catch it and process it and
    allow the rest of the flow to go through

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-734 ">MAPREDUCE-734 </a>Fixes a bug which prevented hi ram jobs from being
    removed from the scheduler queue.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-693 ">MAPREDUCE-693 </a> Fixes a bug that when a job is submitted and the
    JT is restarted (before job files have been written) and the job
    is killed after recovery, the conf files fail to be moved to the
    "done" subdirectory.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-722 ">MAPREDUCE-722 </a>Fixes a bug where more slots are getting reserved
    for HiRAM job tasks than required.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-683 ">MAPREDUCE-683 </a>TestJobTrackerRestart failed because of stale
    filemanager cache (which was created once per jvm). This patch makes
    sure that the filemanager is inited upon every JobHistory.init()
    and hence upon every restart. Note that this wont happen in production
    as upon a restart the new jobtracker will start in a new jvm and
    hence a new cache will be created.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-709 ">MAPREDUCE-709 </a>Fixes a bug where node health check script does
    not display the correct message on timeout.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-708 ">MAPREDUCE-708 </a>Fixes a bug where node health check script does
    not refresh the "reason for blacklisting".

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-522 ">MAPREDUCE-522 </a>Rewrote TestQueueCapacities to make it simpler
    and avoid timeout errors.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-532 ">MAPREDUCE-532 </a>Provided ability in the capacity scheduler to
    limit the number of slots that can be concurrently used per queue
    at any given time.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-211 ">MAPREDUCE-211 </a>Provides ability to run a health check script on
    the tasktracker nodes and blacklist nodes if they are unhealthy.
    Contributed by Sreekanth Ramakrishnan.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-516 ">MAPREDUCE-516 </a>Remove .orig file included by mistake.

<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-416 ">MAPREDUCE-416 </a>Moves the history file to a "done" folder whenever
    a job completes.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5980">HADOOP-5980</a> Previously, task spawned off by LinuxTaskController
    didn't get LD_LIBRARY_PATH in their environment. The tasks will now
    get same LD_LIBRARY_PATH value as when spawned off by
    DefaultTaskController.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5981">HADOOP-5981</a> This issue completes the feature mentioned in
    <a href="https://issues.apache.org/jira/browse/HADOOP-2838">HADOOP-2838</a>. <a href="https://issues.apache.org/jira/browse/HADOOP-2838">HADOOP-2838</a> provided a way to set env variables in
    child process. This issue provides a way to inherit tt's env variables
    and append or reset it. So now X=$X:y will inherit X (if there) and
    append y to it.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5419">HADOOP-5419</a>  This issue is to provide an improvement on the
    existing M/R framework to let users know which queues they have
    access to, and for what operations. One use case for this would
    that currently there is no easy way to know if the user has access
    to submit jobs to a queue, until it fails with an access control
    exception.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5420">HADOOP-5420</a> Support setsid based kill in LinuxTaskController.

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5643">HADOOP-5643</a> Added the functionality to refresh jobtrackers node
    list via command line (bin/hadoop mradmin -refreshNodes). The command
    should be run as the jobtracker owner (jobtracker process owner)
    or from a super group (mapred.permissions.supergroup).

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-2838">HADOOP-2838</a> Now the users can set environment variables using
    mapred.child.env. They can do the following X=Y : set X to Y X=$X:Y
    : Append Y to X (which should be taken from the tasktracker)
    
    <a href="https://issues.apache.org/jira/browse/HADOOP-5818">HADOOP-5818</a>. Revert the renaming from FSNamesystem.checkSuperuserPrivilege
    to checkAccess by <a href="https://issues.apache.org/jira/browse/HADOOP-5643">HADOOP-5643</a>.  (Amar Kamat via szetszwo)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5801">HADOOP-5801</a>. Fixes the problem: If the hosts file is changed across restart
    then it should be refreshed upon recovery so that the excluded hosts are
    lost and the maps are re-executed. (Amar Kamat via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5643">HADOOP-5643</a>. <a href="https://issues.apache.org/jira/browse/HADOOP-5643">HADOOP-5643</a>. Adds a way to decommission TaskTrackers 
    while the JobTracker is running. (Amar Kamat via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5419">HADOOP-5419</a>. Provide a facility to query the Queue ACLs for the
    current user.  (Rahul Kumar Singh via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5733">HADOOP-5733</a>. Add map/reduce slot capacity and blacklisted capacity to
    JobTracker metrics. (Sreekanth Ramakrishnan via cdouglas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5738">HADOOP-5738</a>. Split "waiting_tasks" JobTracker metric into waiting maps and
    waiting reduces. (Sreekanth Ramakrishnan via cdouglas) 

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4842">HADOOP-4842</a>. Streaming now allows specifiying a command for the combiner.
    (Amareshwari Sriramadasu via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4490">HADOOP-4490</a>. Provide ability to run tasks as job owners.
    (Sreekanth Ramakrishnan via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5442">HADOOP-5442</a>. Paginate jobhistory display and added some search
    capabilities. (Amar Kamat via acmurthy)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-3327">HADOOP-3327</a>. Improves handling of READ_TIMEOUT during map output copying.
    (Amareshwari Sriramadasu via ddas)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-5113">HADOOP-5113</a>. Fixed logcondense to remove files for usernames
    beginning with characters specified in the -l option.
    (Peeyush Bishnoi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-2898">HADOOP-2898</a>. Provide an option to specify a port range for
    Hadoop services provisioned by HOD.
    (Peeyush Bishnoi via yhemanth)

<li> <a href="https://issues.apache.org/jira/browse/HADOOP-4930">HADOOP-4930</a>. Implement a Linux native executable that can be used to
    launch tasks as users. (Sreekanth Ramakrishnan via yhemanth)
</ul>

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