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From naganarasimha...@apache.org
Subject [28/77] [abbrv] [partial] hadoop git commit: HADOOP-14364. refresh changelog/release notes with newer Apache Yetus build
Date Sun, 03 Sep 2017 23:55:08 GMT
http://git-wip-us.apache.org/repos/asf/hadoop/blob/19041008/hadoop-common-project/hadoop-common/src/site/markdown/release/0.23.0/RELEASENOTES.0.23.0.md
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/site/markdown/release/0.23.0/RELEASENOTES.0.23.0.md b/hadoop-common-project/hadoop-common/src/site/markdown/release/0.23.0/RELEASENOTES.0.23.0.md
index 69e364f..3e3ef45 100644
--- a/hadoop-common-project/hadoop-common/src/site/markdown/release/0.23.0/RELEASENOTES.0.23.0.md
+++ b/hadoop-common-project/hadoop-common/src/site/markdown/release/0.23.0/RELEASENOTES.0.23.0.md
@@ -23,201 +23,198 @@ These release notes cover new developer and user-facing incompatibilities, impor
 
 ---
 
-* [HADOOP-7740](https://issues.apache.org/jira/browse/HADOOP-7740) | *Minor* | **security audit logger is not on by default, fix the log4j properties to enable the logger**
+* [HADOOP-6683](https://issues.apache.org/jira/browse/HADOOP-6683) | *Minor* | **the first optimization: ZlibCompressor does not fully utilize the buffer**
 
-Fixed security audit logger configuration. (Arpit Gupta via Eric Yang)
+Improve the buffer utilization of ZlibCompressor to avoid invoking a JNI per write request.
 
 
 ---
 
-* [HADOOP-7728](https://issues.apache.org/jira/browse/HADOOP-7728) | *Major* | **hadoop-setup-conf.sh should be modified to enable task memory manager**
+* [HADOOP-7023](https://issues.apache.org/jira/browse/HADOOP-7023) | *Major* | **Add listCorruptFileBlocks to FileSystem**
 
-Enable task memory management to be configurable via hadoop config setup script.
+Add a new API listCorruptFileBlocks to FIleContext that returns a list of files that have corrupt blocks.
 
 
 ---
 
-* [HADOOP-7724](https://issues.apache.org/jira/browse/HADOOP-7724) | *Major* | **hadoop-setup-conf.sh should put proxy user info into the core-site.xml**
+* [HADOOP-7059](https://issues.apache.org/jira/browse/HADOOP-7059) | *Major* | **Remove "unused" warning in native code**
 
-Fixed hadoop-setup-conf.sh to put proxy user in core-site.xml.  (Arpit Gupta via Eric Yang)
+Adds \_\_attribute\_\_ ((unused))
 
 
 ---
 
-* [HADOOP-7720](https://issues.apache.org/jira/browse/HADOOP-7720) | *Major* | **improve the hadoop-setup-conf.sh to read in the hbase user and setup the configs**
+* [HDFS-1526](https://issues.apache.org/jira/browse/HDFS-1526) | *Major* | **Dfs client name for a map/reduce task should have some randomness**
 
-Added parameter for HBase user to setup config script. (Arpit Gupta via Eric Yang)
+Make a client name has this format: DFSClient\_applicationid\_randomint\_threadid, where applicationid = mapred.task.id or else = "NONMAPREDUCE".
 
 
 ---
 
-* [HADOOP-7715](https://issues.apache.org/jira/browse/HADOOP-7715) | *Major* | **see log4j Error when running mr jobs and certain dfs calls**
+* [HDFS-1560](https://issues.apache.org/jira/browse/HDFS-1560) | *Minor* | **dfs.data.dir permissions should default to 700**
 
-Removed unnecessary security logger configuration. (Eric Yang)
+The permissions on datanode data directories (configured by dfs.datanode.data.dir.perm) now default to 0700. Upon startup, the datanode will automatically change the permissions to match the configured value.
 
 
 ---
 
-* [HADOOP-7711](https://issues.apache.org/jira/browse/HADOOP-7711) | *Major* | **hadoop-env.sh generated from templates has duplicate info**
+* [MAPREDUCE-1906](https://issues.apache.org/jira/browse/MAPREDUCE-1906) | *Major* | **Lower default minimum heartbeat interval for tasktracker \> Jobtracker**
 
-Fixed recursive sourcing of HADOOP\_OPTS environment variables (Arpit Gupta via Eric Yang)
+The default minimum heartbeat interval has been dropped from 3 seconds to 300ms to increase scheduling throughput on small clusters. Users may tune mapreduce.jobtracker.heartbeats.in.second to adjust this value.
 
 
 ---
 
-* [HADOOP-7708](https://issues.apache.org/jira/browse/HADOOP-7708) | *Critical* | **config generator does not update the properties file if on exists already**
+* [MAPREDUCE-2207](https://issues.apache.org/jira/browse/MAPREDUCE-2207) | *Major* | **Task-cleanup task should not be scheduled on the node that the task just failed**
 
-Fixed hadoop-setup-conf.sh to handle config file consistently.  (Eric Yang)
+Task-cleanup task should not be scheduled on the node that the task just failed
 
 
 ---
 
-* [HADOOP-7707](https://issues.apache.org/jira/browse/HADOOP-7707) | *Major* | **improve config generator to allow users to specify proxy user, turn append on or off, turn webhdfs on or off**
+* [HDFS-1536](https://issues.apache.org/jira/browse/HDFS-1536) | *Major* | **Improve HDFS WebUI**
 
-Added toggle for dfs.support.append, webhdfs and hadoop proxy user to setup config script. (Arpit Gupta via Eric Yang)
+On web UI, missing block number now becomes accurate and under-replicated blocks do not include missing blocks.
 
 
 ---
 
-* [HADOOP-7691](https://issues.apache.org/jira/browse/HADOOP-7691) | *Major* | **hadoop deb pkg should take a diff group id**
+* [HADOOP-7089](https://issues.apache.org/jira/browse/HADOOP-7089) | *Minor* | **Fix link resolution logic in hadoop-config.sh**
 
-Fixed conflict uid for install packages. (Eric Yang)
+Updates hadoop-config.sh to always resolve symlinks when determining HADOOP\_HOME. Bash built-ins or POSIX:2001 compliant cmds are now required.
 
 
 ---
 
-* [HADOOP-7684](https://issues.apache.org/jira/browse/HADOOP-7684) | *Major* | **jobhistory server and secondarynamenode should have init.d script**
+* [HDFS-1547](https://issues.apache.org/jira/browse/HDFS-1547) | *Major* | **Improve decommission mechanism**
 
-Added init.d script for jobhistory server and secondary namenode. (Eric Yang)
+Summary of changes to the decommissioning process:
+# After nodes are decommissioned, they are not shutdown. The decommissioned nodes are not used for writes. For reads, the decommissioned nodes are given as the last location to read from.
+# Number of live and dead decommissioned nodes are displayed in the namenode webUI.
+# Decommissioned nodes free capacity is not count towards the the cluster free capacity.
 
 
 ---
 
-* [HADOOP-7681](https://issues.apache.org/jira/browse/HADOOP-7681) | *Minor* | **log4j.properties is missing properties for security audit and hdfs audit should be changed to info**
-
-HADOOP-7681. Fixed security and hdfs audit log4j properties
-(Arpit Gupta via Eric Yang)
-
+* [HDFS-1448](https://issues.apache.org/jira/browse/HDFS-1448) | *Major* | **Create multi-format parser for edits logs file, support binary and XML formats initially**
 
----
+Offline edits viewer feature adds oev tool to hdfs script. Oev makes it possible to convert edits logs to/from native binary and XML formats. It uses the same framework as Offline image viewer.
 
-* [HADOOP-7668](https://issues.apache.org/jira/browse/HADOOP-7668) | *Minor* | **Add a NetUtils method that can tell if an InetAddress belongs to local host**
+Example usage:
 
-closing again
+$HADOOP\_HOME/bin/hdfs oev -i edits -o output.xml
 
 
 ---
 
-* [HADOOP-7655](https://issues.apache.org/jira/browse/HADOOP-7655) | *Major* | **provide a small validation script that smoke tests the installed cluster**
+* [HADOOP-6864](https://issues.apache.org/jira/browse/HADOOP-6864) | *Major* | **Provide a JNI-based implementation of ShellBasedUnixGroupsNetgroupMapping (implementation of GroupMappingServiceProvider)**
 
-Committed to trunk and v23, since code reviewed by Eric.
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [HADOOP-7603](https://issues.apache.org/jira/browse/HADOOP-7603) | *Major* | **Set default hdfs, mapred uid, and hadoop group gid for RPM packages**
+* [HADOOP-6904](https://issues.apache.org/jira/browse/HADOOP-6904) | *Major* | **A baby step towards inter-version RPC communications**
 
-Set hdfs uid, mapred uid, and hadoop gid to fixed numbers (201, 202, and 123, respectively).
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [HADOOP-7547](https://issues.apache.org/jira/browse/HADOOP-7547) | *Minor* | **Fix the warning in writable classes.[ WritableComparable is a raw type. References to generic type WritableComparable\<T\> should be parameterized  ]**
+* [HADOOP-6436](https://issues.apache.org/jira/browse/HADOOP-6436) | *Major* | **Remove auto-generated native build files**
 
-**WARNING: No release note provided for this incompatible change.**
+The native build run when from trunk now requires autotools, libtool and openssl dev libraries.
 
 
 ---
 
-* [HADOOP-7507](https://issues.apache.org/jira/browse/HADOOP-7507) | *Major* | **jvm metrics all use the same namespace**
+* [MAPREDUCE-2260](https://issues.apache.org/jira/browse/MAPREDUCE-2260) | *Major* | **Remove auto-generated native build files**
 
-JVM metrics published to Ganglia now include the process name as part of the gmetric name.
+The native build run when from trunk now requires autotools, libtool and openssl dev libraries.
 
 
 ---
 
-* [HADOOP-7379](https://issues.apache.org/jira/browse/HADOOP-7379) | *Major* | **Add ability to include Protobufs in ObjectWritable**
+* [HDFS-1582](https://issues.apache.org/jira/browse/HDFS-1582) | *Major* | **Remove auto-generated native build files**
 
-Protocol buffer-generated types may now be used as arguments or return values for Hadoop RPC.
+The native build run when from trunk now requires autotools, libtool and openssl dev libraries.
 
 
 ---
 
-* [HADOOP-7374](https://issues.apache.org/jira/browse/HADOOP-7374) | *Major* | **Don't add tools.jar to the classpath when running Hadoop**
+* [HADOOP-6432](https://issues.apache.org/jira/browse/HADOOP-6432) | *Major* | **Statistics support in FileContext**
 
-The scripts that run Hadoop no longer automatically add tools.jar from the JDK to the classpath (if it is present). If your job depends on tools.jar in the JDK you will need to add this dependency in your job.
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [HADOOP-7331](https://issues.apache.org/jira/browse/HADOOP-7331) | *Trivial* | **Make hadoop-daemon.sh to return 1 if daemon processes did not get started**
+* [HADOOP-7136](https://issues.apache.org/jira/browse/HADOOP-7136) | *Major* | **Remove failmon contrib**
 
-hadoop-daemon.sh now returns a non-zero exit code if it detects that the daemon was not still running after 3 seconds.
+Failmon removed from contrib codebase.
 
 
 ---
 
-* [HADOOP-7322](https://issues.apache.org/jira/browse/HADOOP-7322) | *Minor* | **Adding a util method in FileUtil for JDK File.listFiles**
+* [MAPREDUCE-2254](https://issues.apache.org/jira/browse/MAPREDUCE-2254) | *Major* | **Allow setting of end-of-record delimiter for TextInputFormat**
 
-Use of this new utility method avoids null result from File.listFiles(), and consequent NPEs.
+TextInputFormat may now split lines with delimiters other than newline, by specifying a configuration parameter "textinputformat.record.delimiter"
 
 
 ---
 
-* [HADOOP-7305](https://issues.apache.org/jira/browse/HADOOP-7305) | *Minor* | **Eclipse project files are incomplete**
+* [HADOOP-7153](https://issues.apache.org/jira/browse/HADOOP-7153) | *Minor* | **MapWritable violates contract of Map interface for equals() and hashCode()**
 
-Added missing library during creation of the eclipse project files.
+MapWritable now implements equals() and hashCode() based on the map contents rather than object identity in order to correctly implement the Map interface.
 
 
 ---
 
-* [HADOOP-7286](https://issues.apache.org/jira/browse/HADOOP-7286) | *Major* | **Refactor FsShell's du/dus/df**
+* [MAPREDUCE-1996](https://issues.apache.org/jira/browse/MAPREDUCE-1996) | *Trivial* | **API: Reducer.reduce() method detail misstatement**
 
-The "Found X items" header on the output of the "du" command has been removed to more closely match unix. The displayed paths now correspond to the command line arguments instead of always being a fully qualified URI. For example, the output will have relative paths if the command line arguments are relative paths.
+Fix a misleading documentation note about the usage of Reporter objects in Reducers.
 
 
 ---
 
-* [HADOOP-7264](https://issues.apache.org/jira/browse/HADOOP-7264) | *Major* | **Bump avro version to at least 1.4.1**
+* [MAPREDUCE-1159](https://issues.apache.org/jira/browse/MAPREDUCE-1159) | *Trivial* | **Limit Job name on jobtracker.jsp to be 80 char long**
 
-**WARNING: No release note provided for this incompatible change.**
+Job names on jobtracker.jsp should be 80 characters long at most.
 
 
 ---
 
-* [HADOOP-7257](https://issues.apache.org/jira/browse/HADOOP-7257) | *Major* | **A client side mount table to give per-application/per-job file system view**
+* [HDFS-1626](https://issues.apache.org/jira/browse/HDFS-1626) | *Minor* | **Make BLOCK\_INVALIDATE\_LIMIT configurable**
 
-viewfs - client-side mount table.
+Added a new configuration property dfs.block.invalidate.limit for FSNamesystem.blockInvalidateLimit.
 
 
 ---
 
-* [HADOOP-7227](https://issues.apache.org/jira/browse/HADOOP-7227) | *Major* | **Remove protocol version check at proxy creation in Hadoop RPC.**
+* [MAPREDUCE-2225](https://issues.apache.org/jira/browse/MAPREDUCE-2225) | *Blocker* | **MultipleOutputs should not require the use of 'Writable'**
 
-1. Protocol version check is removed from proxy creation, instead version check is performed at server in every rpc call.
-2. This change is backward incompatible because format of the rpc messages is changed to include client version, client method hash and rpc version.
-3. rpc version is introduced which should change when the format of rpc messages is changed.
+MultipleOutputs should not require the use/check of 'Writable' interfaces in key and value classes.
 
 
 ---
 
-* [HADOOP-7193](https://issues.apache.org/jira/browse/HADOOP-7193) | *Minor* | **Help message is wrong for touchz command.**
+* [MAPREDUCE-1811](https://issues.apache.org/jira/browse/MAPREDUCE-1811) | *Minor* | **Job.monitorAndPrintJob() should print status of the job at completion**
 
-Updated the help for the touchz command.
+Print the resultant status of a Job on completion instead of simply saying 'Complete'.
 
 
 ---
 
-* [HADOOP-7153](https://issues.apache.org/jira/browse/HADOOP-7153) | *Minor* | **MapWritable violates contract of Map interface for equals() and hashCode()**
+* [MAPREDUCE-993](https://issues.apache.org/jira/browse/MAPREDUCE-993) | *Minor* | **bin/hadoop job -events \<jobid\> \<from-event-#\> \<#-of-events\> help message is confusing**
 
-MapWritable now implements equals() and hashCode() based on the map contents rather than object identity in order to correctly implement the Map interface.
+Added a helpful description message to the \`mapred job -events\` command.
 
 
 ---
 
-* [HADOOP-7136](https://issues.apache.org/jira/browse/HADOOP-7136) | *Major* | **Remove failmon contrib**
+* [MAPREDUCE-1242](https://issues.apache.org/jira/browse/MAPREDUCE-1242) | *Trivial* | **Chain APIs error misleading**
 
-Failmon removed from contrib codebase.
+Fix a misleading exception message in case the Chained Mappers have mismatch in input/output Key/Value pairs between them.
 
 
 ---
@@ -229,37 +226,37 @@ This is the COMMON portion of a fix requiring coordinated change of COMMON and H
 
 ---
 
-* [HADOOP-7119](https://issues.apache.org/jira/browse/HADOOP-7119) | *Major* | **add Kerberos HTTP SPNEGO authentication support to Hadoop JT/NN/DN/TT web-consoles**
+* [HDFS-1703](https://issues.apache.org/jira/browse/HDFS-1703) | *Minor* | **HDFS federation: Improve start/stop scripts and add script to decommission datanodes**
 
-Adding support for Kerberos HTTP SPNEGO authentication to the Hadoop web-consoles
+The masters file is no longer used to indicate which hosts to start the 2NN on. The 2NN is now started on hosts when dfs.namenode.secondary.http-address is configured with a non-wildcard IP.
 
 
 ---
 
-* [HADOOP-7117](https://issues.apache.org/jira/browse/HADOOP-7117) | *Major* | **Move secondary namenode checkpoint configs from core-default.xml to hdfs-default.xml**
+* [HDFS-1675](https://issues.apache.org/jira/browse/HDFS-1675) | *Major* | **Transfer RBW between datanodes**
 
-Removed references to the older fs.checkpoint.\* properties that resided in core-site.xml
+Added a new stage TRANSFER\_RBW to DataTransferProtocol
 
 
 ---
 
-* [HADOOP-7089](https://issues.apache.org/jira/browse/HADOOP-7089) | *Minor* | **Fix link resolution logic in hadoop-config.sh**
+* [HDFS-1596](https://issues.apache.org/jira/browse/HDFS-1596) | *Major* | **Move secondary namenode checkpoint configs from core-default.xml to hdfs-default.xml**
 
-Updates hadoop-config.sh to always resolve symlinks when determining HADOOP\_HOME. Bash built-ins or POSIX:2001 compliant cmds are now required.
+Removed references to the older fs.checkpoint.\* properties that resided in core-site.xml
 
 
 ---
 
-* [HADOOP-7059](https://issues.apache.org/jira/browse/HADOOP-7059) | *Major* | **Remove "unused" warning in native code**
+* [HADOOP-7117](https://issues.apache.org/jira/browse/HADOOP-7117) | *Major* | **Move secondary namenode checkpoint configs from core-default.xml to hdfs-default.xml**
 
-Adds \_\_attribute\_\_ ((unused))
+Removed references to the older fs.checkpoint.\* properties that resided in core-site.xml
 
 
 ---
 
-* [HADOOP-7023](https://issues.apache.org/jira/browse/HADOOP-7023) | *Major* | **Add listCorruptFileBlocks to FileSystem**
+* [HDFS-1445](https://issues.apache.org/jira/browse/HDFS-1445) | *Major* | **Batch the calls in DataStorage to FileUtil.createHardLink(), so we call it once per directory instead of once per file**
 
-Add a new API listCorruptFileBlocks to FIleContext that returns a list of files that have corrupt blocks.
+Batch hardlinking during "upgrade" snapshots, cutting time from aprx 8 minutes per volume to aprx 8 seconds.  Validated in both Linux and Windows.  Depends on prior integration with patch for HADOOP-7133.
 
 
 ---
@@ -272,904 +269,907 @@ Introduces ArrayPrimitiveWritable for a much more efficient wire format to trans
 
 ---
 
-* [HADOOP-6921](https://issues.apache.org/jira/browse/HADOOP-6921) | *Major* | **metrics2: metrics plugins**
+* [HADOOP-7193](https://issues.apache.org/jira/browse/HADOOP-7193) | *Minor* | **Help message is wrong for touchz command.**
 
-Metrics names are standardized to CapitalizedCamelCase. See release note of HADOOP-6918 and HADOOP-6920.
+Updated the help for the touchz command.
 
 
 ---
 
-* [HADOOP-6920](https://issues.apache.org/jira/browse/HADOOP-6920) | *Major* | **Metrics2: metrics instrumentation**
+* [HDFS-1120](https://issues.apache.org/jira/browse/HDFS-1120) | *Major* | **Make DataNode's block-to-device placement policy pluggable**
 
-Metrics names are standardized to use CapitalizedCamelCase. Some examples of this is:
-# Metrics names using "\_" is changed to new naming scheme. Eg: bytes\_written changes to BytesWritten.
-# All metrics names start with capitals. Example: threadsBlocked changes to ThreadsBlocked.
+Make the DataNode's block-volume choosing policy pluggable.
 
 
 ---
 
-* [HADOOP-6919](https://issues.apache.org/jira/browse/HADOOP-6919) | *Major* | **Metrics2: metrics framework**
+* [HDFS-1761](https://issues.apache.org/jira/browse/HDFS-1761) | *Major* | **Add a new DataTransferProtocol operation, Op.TRANSFER\_BLOCK, instead of using RPC**
 
-New metrics2 framework for Hadoop.
+Add a new DataTransferProtocol operation, Op.TRANSFER\_BLOCK, for transferring RBW/Finalized with acknowledgement and without using RPC.
 
 
 ---
 
-* [HADOOP-6904](https://issues.apache.org/jira/browse/HADOOP-6904) | *Major* | **A baby step towards inter-version RPC communications**
+* [MAPREDUCE-2405](https://issues.apache.org/jira/browse/MAPREDUCE-2405) | *Major* | **MR-279: Implement uber-AppMaster (in-cluster LocalJobRunner for MRv2)**
 
-**WARNING: No release note provided for this incompatible change.**
+An efficient implementation of small jobs by running all tasks in the MR ApplicationMaster JVM, there-by affecting lower latency.
 
 
 ---
 
-* [HADOOP-6864](https://issues.apache.org/jira/browse/HADOOP-6864) | *Major* | **Provide a JNI-based implementation of ShellBasedUnixGroupsNetgroupMapping (implementation of GroupMappingServiceProvider)**
+* [HDFS-1606](https://issues.apache.org/jira/browse/HDFS-1606) | *Major* | **Provide a stronger data guarantee in the write pipeline**
 
-**WARNING: No release note provided for this incompatible change.**
+Added two configuration properties, dfs.client.block.write.replace-datanode-on-failure.enable and dfs.client.block.write.replace-datanode-on-failure.policy.  Added a new feature to replace datanode on failure in DataTransferProtocol.  Added getAdditionalDatanode(..) in ClientProtocol.
 
 
 ---
 
-* [HADOOP-6683](https://issues.apache.org/jira/browse/HADOOP-6683) | *Minor* | **the first optimization: ZlibCompressor does not fully utilize the buffer**
+* [HDFS-1070](https://issues.apache.org/jira/browse/HDFS-1070) | *Major* | **Speedup NameNode image loading and saving by storing local file names**
 
-Improve the buffer utilization of ZlibCompressor to avoid invoking a JNI per write request.
+This changes the fsimage format to be
+root directory-1 directory-2 ... directoy-n.
+Each directory stores all its children in the following format:
+Directory\_full\_path\_name num\_of\_children child-1 ... child-n.
+Each inode stores only the last component of its path name into fsimage.
+This change requires an upgrade at deployment.
 
 
 ---
 
-* [HADOOP-6436](https://issues.apache.org/jira/browse/HADOOP-6436) | *Major* | **Remove auto-generated native build files**
+* [HDFS-1594](https://issues.apache.org/jira/browse/HDFS-1594) | *Major* | **When the disk becomes full Namenode is getting shutdown and not able to recover**
 
-The native build run when from trunk now requires autotools, libtool and openssl dev libraries.
+Implemented a daemon thread to monitor the disk usage for periodically and if the disk usage reaches the threshold value, put the name node into Safe mode so that no modification to file system will occur. Once the disk usage reaches below the threshold, name node will be put out of the safe mode. Here threshold value and interval to check the disk usage are configurable.
 
 
 ---
 
-* [HADOOP-6432](https://issues.apache.org/jira/browse/HADOOP-6432) | *Major* | **Statistics support in FileContext**
+* [HDFS-1843](https://issues.apache.org/jira/browse/HDFS-1843) | *Minor* | **Discover file not found early for file append**
 
-**WARNING: No release note provided for this incompatible change.**
+I have committed this. Thanks to Bharath!
 
 
 ---
 
-* [HADOOP-6385](https://issues.apache.org/jira/browse/HADOOP-6385) | *Minor* | **dfs does not support -rmdir (was HDFS-639)**
+* [MAPREDUCE-1461](https://issues.apache.org/jira/browse/MAPREDUCE-1461) | *Major* | **Feature to instruct rumen-folder utility to skip jobs worth of specific duration**
 
-The "rm" family of FsShell commands now supports -rmdir and -f options.
+Added a ''-starts-after' option to Rumen's Folder utility. The time duration specified after the '-starts-after' option is an offset with respect to the submit time of the first job in the input trace. Jobs in the input trace having a submit time (relative to the first job's submit time) lesser than the specified offset will be ignored.
 
 
 ---
 
-* [HADOOP-6255](https://issues.apache.org/jira/browse/HADOOP-6255) | *Major* | **Create an rpm integration project**
+* [MAPREDUCE-2153](https://issues.apache.org/jira/browse/MAPREDUCE-2153) | *Major* | **Bring in more job configuration properties in to the trace file**
 
-Added RPM/DEB packages to build system.
+Adds job configuration parameters to the job trace. The configuration parameters are stored under the 'jobProperties' field as key-value pairs.
 
 
 ---
 
-* [HADOOP-5647](https://issues.apache.org/jira/browse/HADOOP-5647) | *Major* | **TestJobHistory fails if /tmp/\_logs is not writable to. Testcase should not depend on /tmp**
+* [MAPREDUCE-2417](https://issues.apache.org/jira/browse/MAPREDUCE-2417) | *Major* | **In Gridmix, in RoundRobinUserResolver mode, the testing/proxy users are not associated with unique users in a trace**
 
-Removed dependency of testcase on /tmp and made it to use test.build.data directory instead.
+Fixes Gridmix in RoundRobinUserResolver mode to map testing/proxy users to unique users in a trace.
 
 
 ---
 
-* [HADOOP-2081](https://issues.apache.org/jira/browse/HADOOP-2081) | *Major* | **Configuration getInt, getLong, and getFloat replace invalid numbers with the default value**
+* [MAPREDUCE-2416](https://issues.apache.org/jira/browse/MAPREDUCE-2416) | *Major* | **In Gridmix, in RoundRobinUserResolver, the list of groups for a user obtained from users-list-file is incorrect**
 
-Invalid configuration values now result in a number format exception rather than the default value being used.
+Removes the restriction of specifying group names in users-list file for Gridmix in RoundRobinUserResolver mode.
 
 
 ---
 
-* [HDFS-2465](https://issues.apache.org/jira/browse/HDFS-2465) | *Major* | **Add HDFS support for fadvise readahead and drop-behind**
+* [MAPREDUCE-2434](https://issues.apache.org/jira/browse/MAPREDUCE-2434) | *Major* | **MR-279: ResourceManager metrics**
 
-HDFS now has the ability to use posix\_fadvise and sync\_data\_range syscalls to manage the OS buffer cache. This support is currently considered experimental, and may be enabled by configuring the following keys:
-dfs.datanode.drop.cache.behind.writes - set to true to drop data out of the buffer cache after writing
-dfs.datanode.drop.cache.behind.reads - set to true to drop data out of the buffer cache when performing sequential reads
-dfs.datanode.sync.behind.writes - set to true to trigger dirty page writeback immediately after writing data
-dfs.datanode.readahead.bytes - set to a non-zero value to trigger readahead for sequential reads
+I just committed this. Thanks Luke!
 
 
 ---
 
-* [HDFS-2355](https://issues.apache.org/jira/browse/HDFS-2355) | *Major* | **Federation: enable using the same configuration file across all the nodes in the cluster.**
+* [MAPREDUCE-1978](https://issues.apache.org/jira/browse/MAPREDUCE-1978) | *Major* | **[Rumen] TraceBuilder should provide recursive input folder scanning**
 
-This change allows when running multiple namenodes on different hosts, sharing the same configuration file across all the nodes in the cluster (Datanodes, NamNode, BackupNode, SecondaryNameNode), without the need to define dfs.federation.nameservice.id parameter.
+Adds -recursive option to TraceBuilder for scanning the input directories recursively.
 
 
 ---
 
-* [HDFS-2338](https://issues.apache.org/jira/browse/HDFS-2338) | *Major* | **Configuration option to enable/disable webhdfs.**
+* [HADOOP-7227](https://issues.apache.org/jira/browse/HADOOP-7227) | *Major* | **Remove protocol version check at proxy creation in Hadoop RPC.**
 
-Added a conf property dfs.webhdfs.enabled for enabling/disabling webhdfs.
+1. Protocol version check is removed from proxy creation, instead version check is performed at server in every rpc call.
+2. This change is backward incompatible because format of the rpc messages is changed to include client version, client method hash and rpc version.
+3. rpc version is introduced which should change when the format of rpc messages is changed.
 
 
 ---
 
-* [HDFS-2318](https://issues.apache.org/jira/browse/HDFS-2318) | *Major* | **Provide authentication to webhdfs using SPNEGO**
+* [MAPREDUCE-2474](https://issues.apache.org/jira/browse/MAPREDUCE-2474) | *Minor* | **Add docs to the new API Partitioner on how to access Job Configuration data**
 
-Added two new conf properties dfs.web.authentication.kerberos.principal and dfs.web.authentication.kerberos.keytab for the SPNEGO servlet filter.
+Improve the Partitioner interface's docs to help fetch Job Configuration objects.
 
 
 ---
 
-* [HDFS-2210](https://issues.apache.org/jira/browse/HDFS-2210) | *Major* | **Remove hdfsproxy**
+* [HADOOP-6919](https://issues.apache.org/jira/browse/HADOOP-6919) | *Major* | **Metrics2: metrics framework**
 
-The hdfsproxy contrib component is no longer supported.
+New metrics2 framework for Hadoop.
 
 
 ---
 
-* [HDFS-2202](https://issues.apache.org/jira/browse/HDFS-2202) | *Major* | **Changes to balancer bandwidth should not require datanode restart.**
-
-New dfsadmin command added: [-setBalancerBandwidth \<bandwidth\>] where bandwidth is max network bandwidth in bytes per second that the balancer is allowed to use on each datanode during balacing.
+* [HDFS-1826](https://issues.apache.org/jira/browse/HDFS-1826) | *Major* | **NameNode should save image to name directories in parallel during upgrade**
 
-This is an incompatible change in 0.23.  The versions of ClientProtocol and DatanodeProtocol are changed.
+I've committed this. Thanks, Matt!
 
 
 ---
 
-* [HDFS-2107](https://issues.apache.org/jira/browse/HDFS-2107) | *Major* | **Move block management code to a package**
+* [MAPREDUCE-2478](https://issues.apache.org/jira/browse/MAPREDUCE-2478) | *Major* | **MR 279: Improve history server**
 
-Moved block management codes to a new package org.apache.hadoop.hdfs.server.blockmanagement.
+Looks great. I just committed this. Thanks Siddharth!
 
 
 ---
 
-* [HDFS-2087](https://issues.apache.org/jira/browse/HDFS-2087) | *Major* | **Add methods to DataTransferProtocol interface**
+* [HADOOP-7257](https://issues.apache.org/jira/browse/HADOOP-7257) | *Major* | **A client side mount table to give per-application/per-job file system view**
 
-Declare methods in DataTransferProtocol interface, and change Sender and Receiver to implement the interface.
+viewfs - client-side mount table.
 
 
 ---
 
-* [HDFS-2066](https://issues.apache.org/jira/browse/HDFS-2066) | *Major* | **Create a package and individual class files for DataTransferProtocol**
+* [HADOOP-6920](https://issues.apache.org/jira/browse/HADOOP-6920) | *Major* | **Metrics2: metrics instrumentation**
 
-**WARNING: No release note provided for this incompatible change.**
+Metrics names are standardized to use CapitalizedCamelCase. Some examples of this is:
+# Metrics names using "\_" is changed to new naming scheme. Eg: bytes\_written changes to BytesWritten.
+# All metrics names start with capitals. Example: threadsBlocked changes to ThreadsBlocked.
 
 
 ---
 
-* [HDFS-2058](https://issues.apache.org/jira/browse/HDFS-2058) | *Major* | **DataTransfer Protocol using protobufs**
+* [HADOOP-6921](https://issues.apache.org/jira/browse/HADOOP-6921) | *Major* | **metrics2: metrics plugins**
 
-**WARNING: No release note provided for this incompatible change.**
+Metrics names are standardized to CapitalizedCamelCase. See release note of HADOOP-6918 and HADOOP-6920.
 
 
 ---
 
-* [HDFS-2055](https://issues.apache.org/jira/browse/HDFS-2055) | *Major* | **Add hflush support to libhdfs**
+* [HDFS-1814](https://issues.apache.org/jira/browse/HDFS-1814) | *Major* | **HDFS portion of HADOOP-7214 - Hadoop /usr/bin/groups equivalent**
 
-Add hdfsHFlush to libhdfs.
+Introduces a new command, "hdfs groups", which displays what groups are associated with a user as seen by the NameNode.
 
 
 ---
 
-* [HDFS-1966](https://issues.apache.org/jira/browse/HDFS-1966) | *Major* | **Encapsulate individual DataTransferProtocol op header**
+* [MAPREDUCE-2473](https://issues.apache.org/jira/browse/MAPREDUCE-2473) | *Major* | **MR portion of HADOOP-7214 - Hadoop /usr/bin/groups equivalent**
 
-Added header classes for individual DataTransferProtocol op headers.
+Introduces a new command, "mapred groups", which displays what groups are associated with a user as seen by the JobTracker.
 
 
 ---
 
-* [HDFS-1963](https://issues.apache.org/jira/browse/HDFS-1963) | *Major* | **HDFS rpm integration project**
+* [HDFS-1917](https://issues.apache.org/jira/browse/HDFS-1917) | *Major* | **Clean up duplication of dependent jar files**
 
-Create HDFS RPM package
+Remove packaging of duplicated third party jar files
 
 
 ---
 
-* [HDFS-1945](https://issues.apache.org/jira/browse/HDFS-1945) | *Major* | **Removed deprecated fields in DataTransferProtocol**
+* [HDFS-1117](https://issues.apache.org/jira/browse/HDFS-1117) | *Major* | **HDFS portion of HADOOP-6728 (ovehaul metrics framework)**
 
-Removed the deprecated fields in DataTransferProtocol.
+Metrics names are standardized to use CapitalizedCamelCase. Some examples:
+# Metrics names using "\_" is changed to new naming scheme. Eg: bytes\_written changes to BytesWritten.
+# All metrics names start with capitals. Example: threadsBlocked changes to ThreadsBlocked.
 
 
 ---
 
-* [HDFS-1939](https://issues.apache.org/jira/browse/HDFS-1939) | *Major* | **ivy: test conf should not extend common conf**
+* [HDFS-1945](https://issues.apache.org/jira/browse/HDFS-1945) | *Major* | **Removed deprecated fields in DataTransferProtocol**
 
-\* Removed duplicated jars in test class path.
+Removed the deprecated fields in DataTransferProtocol.
 
 
 ---
 
-* [HDFS-1917](https://issues.apache.org/jira/browse/HDFS-1917) | *Major* | **Clean up duplication of dependent jar files**
+* [HADOOP-7286](https://issues.apache.org/jira/browse/HADOOP-7286) | *Major* | **Refactor FsShell's du/dus/df**
 
-Remove packaging of duplicated third party jar files
+The "Found X items" header on the output of the "du" command has been removed to more closely match unix. The displayed paths now correspond to the command line arguments instead of always being a fully qualified URI. For example, the output will have relative paths if the command line arguments are relative paths.
 
 
 ---
 
-* [HDFS-1869](https://issues.apache.org/jira/browse/HDFS-1869) | *Major* | **mkdirs should use the supplied permission for all of the created directories**
+* [HDFS-1939](https://issues.apache.org/jira/browse/HDFS-1939) | *Major* | **ivy: test conf should not extend common conf**
 
-A multi-level mkdir is now POSIX compliant.  Instead of creating intermediate directories with the permissions of the parent directory, intermediate directories are created with permission bits of rwxrwxrwx (0777) as modified by the current umask, plus write and search permission for the owner.
+\* Removed duplicated jars in test class path.
 
 
 ---
 
-* [HDFS-1843](https://issues.apache.org/jira/browse/HDFS-1843) | *Minor* | **Discover file not found early for file append**
+* [MAPREDUCE-2483](https://issues.apache.org/jira/browse/MAPREDUCE-2483) | *Major* | **Clean up duplication of dependent jar files**
 
-I have committed this. Thanks to Bharath!
+Removed duplicated hadoop-common library dependencies.
 
 
 ---
 
-* [HDFS-1826](https://issues.apache.org/jira/browse/HDFS-1826) | *Major* | **NameNode should save image to name directories in parallel during upgrade**
+* [MAPREDUCE-2407](https://issues.apache.org/jira/browse/MAPREDUCE-2407) | *Major* | **Make Gridmix emulate usage of Distributed Cache files**
 
-I've committed this. Thanks, Matt!
+Makes Gridmix emulate HDFS based distributed cache files and local file system based distributed cache files.
 
 
 ---
 
-* [HDFS-1814](https://issues.apache.org/jira/browse/HDFS-1814) | *Major* | **HDFS portion of HADOOP-7214 - Hadoop /usr/bin/groups equivalent**
+* [MAPREDUCE-2492](https://issues.apache.org/jira/browse/MAPREDUCE-2492) | *Major* | **[MAPREDUCE] The new MapReduce API should make available task's progress to the task**
 
-Introduces a new command, "hdfs groups", which displays what groups are associated with a user as seen by the NameNode.
+Map and Reduce task can access the attempt's overall progress via TaskAttemptContext.
 
 
 ---
 
-* [HDFS-1761](https://issues.apache.org/jira/browse/HDFS-1761) | *Major* | **Add a new DataTransferProtocol operation, Op.TRANSFER\_BLOCK, instead of using RPC**
+* [HADOOP-7322](https://issues.apache.org/jira/browse/HADOOP-7322) | *Minor* | **Adding a util method in FileUtil for JDK File.listFiles**
 
-Add a new DataTransferProtocol operation, Op.TRANSFER\_BLOCK, for transferring RBW/Finalized with acknowledgement and without using RPC.
+Use of this new utility method avoids null result from File.listFiles(), and consequent NPEs.
 
 
 ---
 
-* [HDFS-1723](https://issues.apache.org/jira/browse/HDFS-1723) | *Minor* | **quota errors messages should use the same scale**
+* [MAPREDUCE-2137](https://issues.apache.org/jira/browse/MAPREDUCE-2137) | *Major* | **Mapping between Gridmix jobs and the corresponding original MR jobs is needed**
 
-Updated the Quota exceptions to now use human readable output.
+New configuration properties gridmix.job.original-job-id and gridmix.job.original-job-name in the configuration of simulated job are exposed/documented to gridmix user for mapping between original cluster's jobs and simulated jobs.
 
 
 ---
 
-* [HDFS-1703](https://issues.apache.org/jira/browse/HDFS-1703) | *Minor* | **HDFS federation: Improve start/stop scripts and add script to decommission datanodes**
+* [MAPREDUCE-2408](https://issues.apache.org/jira/browse/MAPREDUCE-2408) | *Major* | **Make Gridmix emulate usage of data compression**
 
-The masters file is no longer used to indicate which hosts to start the 2NN on. The 2NN is now started on hosts when dfs.namenode.secondary.http-address is configured with a non-wildcard IP.
+Emulates the MapReduce compression feature in Gridmix. By default, compression emulation is turned on. Compression emulation can be disabled by setting 'gridmix.compression-emulation.enable' to 'false'.  Use 'gridmix.compression-emulation.map-input.decompression-ratio', 'gridmix.compression-emulation.map-output.compression-ratio' and 'gridmix.compression-emulation.reduce-output.compression-ratio' to configure the compression ratios at map input, map output and reduce output side respectively. Currently, compression ratios in the range [0.07, 0.68] are supported. Gridmix auto detects whether map-input, map output and reduce output should emulate compression based on original job's compression related configuration parameters.
 
 
 ---
 
-* [HDFS-1675](https://issues.apache.org/jira/browse/HDFS-1675) | *Major* | **Transfer RBW between datanodes**
+* [MAPREDUCE-2517](https://issues.apache.org/jira/browse/MAPREDUCE-2517) | *Major* | **Porting Gridmix v3 system tests into trunk branch.**
 
-Added a new stage TRANSFER\_RBW to DataTransferProtocol
+Adds system tests to Gridmix. These system tests cover various features like job types (load and sleep), user resolvers (round-robin, submitter-user, echo) and  submission modes (stress, replay and serial).
 
 
 ---
 
-* [HDFS-1636](https://issues.apache.org/jira/browse/HDFS-1636) | *Minor* | **If dfs.name.dir points to an empty dir, namenode format shouldn't require confirmation**
+* [HADOOP-6255](https://issues.apache.org/jira/browse/HADOOP-6255) | *Major* | **Create an rpm integration project**
 
-If dfs.name.dir points to an empty dir, namenode -format no longer requires confirmation.
+Added RPM/DEB packages to build system.
 
 
 ---
 
-* [HDFS-1626](https://issues.apache.org/jira/browse/HDFS-1626) | *Minor* | **Make BLOCK\_INVALIDATE\_LIMIT configurable**
+* [HDFS-1963](https://issues.apache.org/jira/browse/HDFS-1963) | *Major* | **HDFS rpm integration project**
 
-Added a new configuration property dfs.block.invalidate.limit for FSNamesystem.blockInvalidateLimit.
+Create HDFS RPM package
 
 
 ---
 
-* [HDFS-1620](https://issues.apache.org/jira/browse/HDFS-1620) | *Minor* | **Rename HdfsConstants -\> HdfsServerConstants, FSConstants -\> HdfsConstants**
+* [MAPREDUCE-2521](https://issues.apache.org/jira/browse/MAPREDUCE-2521) | *Major* | **Mapreduce RPM integration project**
 
-Rename HdfsConstants interface to HdfsServerConstants, FSConstants interface to HdfsConstants
+Created rpm and debian packages for MapReduce.
 
 
 ---
 
-* [HDFS-1606](https://issues.apache.org/jira/browse/HDFS-1606) | *Major* | **Provide a stronger data guarantee in the write pipeline**
+* [MAPREDUCE-2455](https://issues.apache.org/jira/browse/MAPREDUCE-2455) | *Major* | **Remove deprecated JobTracker.State in favour of JobTrackerStatus**
 
-Added two configuration properties, dfs.client.block.write.replace-datanode-on-failure.enable and dfs.client.block.write.replace-datanode-on-failure.policy.  Added a new feature to replace datanode on failure in DataTransferProtocol.  Added getAdditionalDatanode(..) in ClientProtocol.
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [HDFS-1596](https://issues.apache.org/jira/browse/HDFS-1596) | *Major* | **Move secondary namenode checkpoint configs from core-default.xml to hdfs-default.xml**
+* [MAPREDUCE-2544](https://issues.apache.org/jira/browse/MAPREDUCE-2544) | *Major* | **Gridmix compression emulation system tests.**
 
-Removed references to the older fs.checkpoint.\* properties that resided in core-site.xml
+Adds system tests for testing the compression emulation feature of Gridmix.
 
 
 ---
 
-* [HDFS-1594](https://issues.apache.org/jira/browse/HDFS-1594) | *Major* | **When the disk becomes full Namenode is getting shutdown and not able to recover**
+* [HDFS-1636](https://issues.apache.org/jira/browse/HDFS-1636) | *Minor* | **If dfs.name.dir points to an empty dir, namenode format shouldn't require confirmation**
 
-Implemented a daemon thread to monitor the disk usage for periodically and if the disk usage reaches the threshold value, put the name node into Safe mode so that no modification to file system will occur. Once the disk usage reaches below the threshold, name node will be put out of the safe mode. Here threshold value and interval to check the disk usage are configurable.
+If dfs.name.dir points to an empty dir, namenode -format no longer requires confirmation.
 
 
 ---
 
-* [HDFS-1582](https://issues.apache.org/jira/browse/HDFS-1582) | *Major* | **Remove auto-generated native build files**
+* [HDFS-1966](https://issues.apache.org/jira/browse/HDFS-1966) | *Major* | **Encapsulate individual DataTransferProtocol op header**
 
-The native build run when from trunk now requires autotools, libtool and openssl dev libraries.
+Added header classes for individual DataTransferProtocol op headers.
 
 
 ---
 
-* [HDFS-1560](https://issues.apache.org/jira/browse/HDFS-1560) | *Minor* | **dfs.data.dir permissions should default to 700**
+* [MAPREDUCE-2469](https://issues.apache.org/jira/browse/MAPREDUCE-2469) | *Major* | **Task counters should also report the total heap usage of the task**
 
-The permissions on datanode data directories (configured by dfs.datanode.data.dir.perm) now default to 0700. Upon startup, the datanode will automatically change the permissions to match the configured value.
+Task attempt's total heap usage gets recorded and published via counters as COMMITTED\_HEAP\_BYTES.
 
 
 ---
 
-* [HDFS-1547](https://issues.apache.org/jira/browse/HDFS-1547) | *Major* | **Improve decommission mechanism**
+* [MAPREDUCE-2543](https://issues.apache.org/jira/browse/MAPREDUCE-2543) | *Major* | **[Gridmix] Add support for HighRam jobs**
 
-Summary of changes to the decommissioning process:
-# After nodes are decommissioned, they are not shutdown. The decommissioned nodes are not used for writes. For reads, the decommissioned nodes are given as the last location to read from.
-# Number of live and dead decommissioned nodes are displayed in the namenode webUI.
-# Decommissioned nodes free capacity is not count towards the the cluster free capacity.
+Adds High-Ram feature emulation in Gridmix.
 
 
 ---
 
-* [HDFS-1536](https://issues.apache.org/jira/browse/HDFS-1536) | *Major* | **Improve HDFS WebUI**
+* [HADOOP-7331](https://issues.apache.org/jira/browse/HADOOP-7331) | *Trivial* | **Make hadoop-daemon.sh to return 1 if daemon processes did not get started**
 
-On web UI, missing block number now becomes accurate and under-replicated blocks do not include missing blocks.
+hadoop-daemon.sh now returns a non-zero exit code if it detects that the daemon was not still running after 3 seconds.
 
 
 ---
 
-* [HDFS-1526](https://issues.apache.org/jira/browse/HDFS-1526) | *Major* | **Dfs client name for a map/reduce task should have some randomness**
+* [MAPREDUCE-2554](https://issues.apache.org/jira/browse/MAPREDUCE-2554) | *Major* | **Gridmix distributed cache emulation system tests.**
 
-Make a client name has this format: DFSClient\_applicationid\_randomint\_threadid, where applicationid = mapred.task.id or else = "NONMAPREDUCE".
+Adds distributed cache related system tests to Gridmix.
 
 
 ---
 
-* [HDFS-1448](https://issues.apache.org/jira/browse/HDFS-1448) | *Major* | **Create multi-format parser for edits logs file, support binary and XML formats initially**
-
-Offline edits viewer feature adds oev tool to hdfs script. Oev makes it possible to convert edits logs to/from native binary and XML formats. It uses the same framework as Offline image viewer.
+* [MAPREDUCE-2529](https://issues.apache.org/jira/browse/MAPREDUCE-2529) | *Major* | **Recognize Jetty bug 1342 and handle it**
 
-Example usage:
+Added 2 new config parameters:
 
-$HADOOP\_HOME/bin/hdfs oev -i edits -o output.xml
+mapreduce.reduce.shuffle.catch.exception.stack.regex
+mapreduce.reduce.shuffle.catch.exception.message.regex
 
 
 ---
 
-* [HDFS-1445](https://issues.apache.org/jira/browse/HDFS-1445) | *Major* | **Batch the calls in DataStorage to FileUtil.createHardLink(), so we call it once per directory instead of once per file**
+* [MAPREDUCE-2104](https://issues.apache.org/jira/browse/MAPREDUCE-2104) | *Major* | **Rumen TraceBuilder Does Not Emit CPU/Memory Usage Details in Traces**
 
-Batch hardlinking during "upgrade" snapshots, cutting time from aprx 8 minutes per volume to aprx 8 seconds.  Validated in both Linux and Windows.  Depends on prior integration with patch for HADOOP-7133.
+Adds cpu, physical memory, virtual memory and heap usages to TraceBuilder's output.
 
 
 ---
 
-* [HDFS-1381](https://issues.apache.org/jira/browse/HDFS-1381) | *Major* | **HDFS javadocs hard-code references to dfs.namenode.name.dir and dfs.datanode.data.dir parameters**
+* [HADOOP-5647](https://issues.apache.org/jira/browse/HADOOP-5647) | *Major* | **TestJobHistory fails if /tmp/\_logs is not writable to. Testcase should not depend on /tmp**
 
-Updated the JavaDocs to appropriately represent the new Configuration Keys that are used in the code. The docs did not match the code.
+Removed dependency of testcase on /tmp and made it to use test.build.data directory instead.
 
 
 ---
 
-* [HDFS-1321](https://issues.apache.org/jira/browse/HDFS-1321) | *Minor* | **If service port and main port are the same, there is no clear log message explaining the issue.**
+* [MAPREDUCE-587](https://issues.apache.org/jira/browse/MAPREDUCE-587) | *Minor* | **Stream test TestStreamingExitStatus fails with Out of Memory**
 
-Added a check to match the sure RPC and HTTP Port's on the NameNode were not set to the same value, otherwise an IOException is throw with the appropriate message.
+Fixed the streaming test TestStreamingExitStatus's failure due to an OutOfMemory error by reducing the testcase's io.sort.mb.
 
 
 ---
 
-* [HDFS-1120](https://issues.apache.org/jira/browse/HDFS-1120) | *Major* | **Make DataNode's block-to-device placement policy pluggable**
+* [HDFS-2058](https://issues.apache.org/jira/browse/HDFS-2058) | *Major* | **DataTransfer Protocol using protobufs**
 
-Make the DataNode's block-volume choosing policy pluggable.
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [HDFS-1117](https://issues.apache.org/jira/browse/HDFS-1117) | *Major* | **HDFS portion of HADOOP-6728 (ovehaul metrics framework)**
+* [MAPREDUCE-2430](https://issues.apache.org/jira/browse/MAPREDUCE-2430) | *Major* | **Remove mrunit contrib**
 
-Metrics names are standardized to use CapitalizedCamelCase. Some examples:
-# Metrics names using "\_" is changed to new naming scheme. Eg: bytes\_written changes to BytesWritten.
-# All metrics names start with capitals. Example: threadsBlocked changes to ThreadsBlocked.
+MRUnit is now available as a separate Apache project.
 
 
 ---
 
-* [HDFS-1073](https://issues.apache.org/jira/browse/HDFS-1073) | *Major* | **Simpler model for Namenode's fs Image and edit Logs**
+* [HADOOP-7374](https://issues.apache.org/jira/browse/HADOOP-7374) | *Major* | **Don't add tools.jar to the classpath when running Hadoop**
 
-The NameNode's storage layout for its name directories has been reorganized to be more robust. Each edit now has a unique transaction ID, and each file is associated with a transaction ID (for checkpoints) or a range of transaction IDs (for edit logs).
+The scripts that run Hadoop no longer automatically add tools.jar from the JDK to the classpath (if it is present). If your job depends on tools.jar in the JDK you will need to add this dependency in your job.
 
 
 ---
 
-* [HDFS-1070](https://issues.apache.org/jira/browse/HDFS-1070) | *Major* | **Speedup NameNode image loading and saving by storing local file names**
+* [HDFS-2066](https://issues.apache.org/jira/browse/HDFS-2066) | *Major* | **Create a package and individual class files for DataTransferProtocol**
 
-This changes the fsimage format to be 
-root directory-1 directory-2 ... directoy-n.
-Each directory stores all its children in the following format:
-Directory\_full\_path\_name num\_of\_children child-1 ... child-n.
-Each inode stores only the last component of its path name into fsimage.
-This change requires an upgrade at deployment.
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [MAPREDUCE-3317](https://issues.apache.org/jira/browse/MAPREDUCE-3317) | *Major* | **Rumen TraceBuilder is emiting null as hostname**
+* [MAPREDUCE-2106](https://issues.apache.org/jira/browse/MAPREDUCE-2106) | *Major* | **Emulate CPU Usage of Tasks in GridMix3**
 
-Fixes Rumen to get correct hostName that includes rackName in attempt info.
+Adds cumulative cpu usage emulation to Gridmix
 
 
 ---
 
-* [MAPREDUCE-3241](https://issues.apache.org/jira/browse/MAPREDUCE-3241) | *Major* | **(Rumen)TraceBuilder throws IllegalArgumentException**
+* [MAPREDUCE-2563](https://issues.apache.org/jira/browse/MAPREDUCE-2563) | *Major* | **Gridmix high ram jobs emulation system tests.**
 
-Rumen is fixed to ignore the AMRestartedEvent.
+Adds system tests to test the High-Ram feature in Gridmix.
 
 
 ---
 
-* [MAPREDUCE-3205](https://issues.apache.org/jira/browse/MAPREDUCE-3205) | *Blocker* | **MR2 memory limits should be pmem, not vmem**
+* [MAPREDUCE-2107](https://issues.apache.org/jira/browse/MAPREDUCE-2107) | *Major* | **Emulate Memory Usage of Tasks in GridMix3**
 
-Resource limits are now expressed and enforced in terms of physical memory, rather than virtual memory. The virtual memory limit is set as a configurable multiple of the physical limit. The NodeManager's memory usage is now configured in units of MB rather than GB.
+Adds total heap usage emulation to Gridmix. Also, Gridmix can configure the simulated task's JVM heap options with max heap options obtained from the original task (via Rumen). Use 'gridmix.task.jvm-options.enable' to disable the task max heap options configuration.
 
 
 ---
 
-* [MAPREDUCE-3186](https://issues.apache.org/jira/browse/MAPREDUCE-3186) | *Blocker* | **User jobs are getting hanged if the Resource manager process goes down and comes up while job is getting executed.**
-
-New Yarn configuration property:
+* [HADOOP-7379](https://issues.apache.org/jira/browse/HADOOP-7379) | *Major* | **Add ability to include Protobufs in ObjectWritable**
 
-Name: yarn.app.mapreduce.am.scheduler.connection.retries
-Description: Number of times AM should retry to contact RM if connection is lost.
+Protocol buffer-generated types may now be used as arguments or return values for Hadoop RPC.
 
 
 ---
 
-* [MAPREDUCE-3166](https://issues.apache.org/jira/browse/MAPREDUCE-3166) | *Major* | **Make Rumen use job history api instead of relying on current history file name format**
+* [HDFS-2055](https://issues.apache.org/jira/browse/HDFS-2055) | *Major* | **Add hflush support to libhdfs**
 
-Makes Rumen use job history api instead of relying on current history file name format.
+Add hdfsHFlush to libhdfs.
 
 
 ---
 
-* [MAPREDUCE-3157](https://issues.apache.org/jira/browse/MAPREDUCE-3157) | *Major* | **Rumen TraceBuilder is skipping analyzing 0.20 history files**
+* [HDFS-2087](https://issues.apache.org/jira/browse/HDFS-2087) | *Major* | **Add methods to DataTransferProtocol interface**
 
-Fixes TraceBuilder to handle 0.20 history file names also.
+Declare methods in DataTransferProtocol interface, and change Sender and Receiver to implement the interface.
 
 
 ---
 
-* [MAPREDUCE-3112](https://issues.apache.org/jira/browse/MAPREDUCE-3112) | *Major* | **Calling hadoop cli inside mapreduce job leads to errors**
+* [HDFS-1321](https://issues.apache.org/jira/browse/HDFS-1321) | *Minor* | **If service port and main port are the same, there is no clear log message explaining the issue.**
 
-Removed inheritance of certain server environment variables (HADOOP\_OPTS and HADOOP\_ROOT\_LOGGER) in task attempt process.
+Added a check to match the sure RPC and HTTP Port's on the NameNode were not set to the same value, otherwise an IOException is throw with the appropriate message.
 
 
 ---
 
-* [MAPREDUCE-3081](https://issues.apache.org/jira/browse/MAPREDUCE-3081) | *Major* | **Change the name format for hadoop core and vaidya jar to be hadoop-{core/vaidya}-{version}.jar in vaidya.sh**
+* [HDFS-1723](https://issues.apache.org/jira/browse/HDFS-1723) | *Minor* | **quota errors messages should use the same scale**
 
-contrib/vaidya/bin/vaidya.sh script fixed to use appropriate jars and classpath
+Updated the Quota exceptions to now use human readable output.
 
 
 ---
 
-* [MAPREDUCE-3042](https://issues.apache.org/jira/browse/MAPREDUCE-3042) | *Major* | **YARN RM fails to start**
+* [HDFS-2107](https://issues.apache.org/jira/browse/HDFS-2107) | *Major* | **Move block management code to a package**
 
-Simple typo fix to allow ResourceManager to start instead of fail
+Moved block management codes to a new package org.apache.hadoop.hdfs.server.blockmanagement.
 
 
 ---
 
-* [MAPREDUCE-3041](https://issues.apache.org/jira/browse/MAPREDUCE-3041) | *Blocker* | **Enhance YARN Client-RM protocol to provide access to information such as cluster's Min/Max Resource capabilities similar to that of AM-RM protocol**
+* [MAPREDUCE-2596](https://issues.apache.org/jira/browse/MAPREDUCE-2596) | *Major* | **Gridmix should notify job failures**
 
-**WARNING: No release note provided for this incompatible change.**
+Gridmix now prints a summary information after every run. It summarizes the runs w.r.t input trace details, input data statistics, cli arguments, data-gen runtime, simulation runtimes etc and also the cluster w.r.t map slots, reduce slots, jobtracker-address, hdfs-address etc.
 
 
 ---
 
-* [MAPREDUCE-2930](https://issues.apache.org/jira/browse/MAPREDUCE-2930) | *Major* | **Generate state graph from the State Machine Definition**
+* [MAPREDUCE-2606](https://issues.apache.org/jira/browse/MAPREDUCE-2606) | *Major* | **Remove IsolationRunner**
 
-Generate state graph from State Machine Definition
+IsolationRunner is no longer maintained. See MAPREDUCE-2637 for its replacement.
 
 
 ---
 
-* [MAPREDUCE-2858](https://issues.apache.org/jira/browse/MAPREDUCE-2858) | *Blocker* | **MRv2 WebApp Security**
+* [HADOOP-7305](https://issues.apache.org/jira/browse/HADOOP-7305) | *Minor* | **Eclipse project files are incomplete**
 
-A new server has been added to yarn.  It is a web proxy that sits in front of the AM web UI.  The server is controlled by the yarn.web-proxy.address config.  If that config is set, and it points to an address that is different then the RM web interface then a separate proxy server needs to be launched.
+Added missing library during creation of the eclipse project files.
 
-This can be done by running 
 
-yarn-daemon.sh start proxyserver
+---
 
-If a separate proxy server is needed other configs also may need to be set, if security is enabled.
-yarn.web-proxy.principal
-yarn.web-proxy.keytab
+* [HADOOP-2081](https://issues.apache.org/jira/browse/HADOOP-2081) | *Major* | **Configuration getInt, getLong, and getFloat replace invalid numbers with the default value**
 
-The proxy server is stateless and should be able to support a VIP or other load balancing sitting in front of multiple instances of this server.
+Invalid configuration values now result in a number format exception rather than the default value being used.
 
 
 ---
 
-* [MAPREDUCE-2846](https://issues.apache.org/jira/browse/MAPREDUCE-2846) | *Blocker* | **a small % of all tasks fail with DefaultTaskController**
+* [HADOOP-6385](https://issues.apache.org/jira/browse/HADOOP-6385) | *Minor* | **dfs does not support -rmdir (was HDFS-639)**
 
-Fixed a race condition in writing the log index file that caused tasks to 'fail'.
+The "rm" family of FsShell commands now supports -rmdir and -f options.
 
 
 ---
 
-* [MAPREDUCE-2789](https://issues.apache.org/jira/browse/MAPREDUCE-2789) | *Major* | **[MR:279] Update the scheduling info on CLI**
+* [HDFS-2210](https://issues.apache.org/jira/browse/HDFS-2210) | *Major* | **Remove hdfsproxy**
 
-"mapred/job -list" now contains map/reduce, container, and resource information.
+The hdfsproxy contrib component is no longer supported.
 
 
 ---
 
-* [MAPREDUCE-2764](https://issues.apache.org/jira/browse/MAPREDUCE-2764) | *Major* | **Fix renewal of dfs delegation tokens**
+* [HDFS-1073](https://issues.apache.org/jira/browse/HDFS-1073) | *Major* | **Simpler model for Namenode's fs Image and edit Logs**
 
-Generalizes token renewal and canceling to a common interface and provides a plugin interface for adding renewers for new kinds of tokens. Hftp changed to store the tokens as HFTP and renew them over http.
+The NameNode's storage layout for its name directories has been reorganized to be more robust. Each edit now has a unique transaction ID, and each file is associated with a transaction ID (for checkpoints) or a range of transaction IDs (for edit logs).
 
 
 ---
 
-* [MAPREDUCE-2736](https://issues.apache.org/jira/browse/MAPREDUCE-2736) | *Major* | **Remove unused contrib components dependent on MR1**
+* [HDFS-1381](https://issues.apache.org/jira/browse/HDFS-1381) | *Major* | **HDFS javadocs hard-code references to dfs.namenode.name.dir and dfs.datanode.data.dir parameters**
 
-The pre-MR2 MapReduce implementation (JobTracker, TaskTracer, etc) and contrib components are no longer supported. This implementation is currently supported in the 0.20.20x releases.
+Updated the JavaDocs to appropriately represent the new Configuration Keys that are used in the code. The docs did not match the code.
 
 
 ---
 
-* [MAPREDUCE-2719](https://issues.apache.org/jira/browse/MAPREDUCE-2719) | *Major* | **MR-279: Write a shell command application**
+* [HDFS-2202](https://issues.apache.org/jira/browse/HDFS-2202) | *Major* | **Changes to balancer bandwidth should not require datanode restart.**
 
-Adding a simple, DistributedShell application as an alternate framework to MapReduce and to act as an illustrative example for porting applications to YARN.
+New dfsadmin command added: [-setBalancerBandwidth \<bandwidth\>] where bandwidth is max network bandwidth in bytes per second that the balancer is allowed to use on each datanode during balacing.
+
+This is an incompatible change in 0.23.  The versions of ClientProtocol and DatanodeProtocol are changed.
 
 
 ---
 
-* [MAPREDUCE-2702](https://issues.apache.org/jira/browse/MAPREDUCE-2702) | *Blocker* | **[MR-279] OutputCommitter changes for MR Application Master recovery**
+* [MAPREDUCE-2494](https://issues.apache.org/jira/browse/MAPREDUCE-2494) | *Major* | **Make the distributed cache delete entires using LRU priority**
 
-Enhance OutputCommitter and FileOutputCommitter to allow for recover of tasks across job restart.
+Added config option mapreduce.tasktracker.cache.local.keep.pct to the TaskTracker.  It is the target percentage of the local distributed cache that should be kept in between garbage collection runs.  In practice it will delete unused distributed cache entries in LRU order until the size of the cache is less than mapreduce.tasktracker.cache.local.keep.pct of the maximum cache size.  This is a floating point value between 0.0 and 1.0.  The default is 0.95.
 
 
 ---
 
-* [MAPREDUCE-2649](https://issues.apache.org/jira/browse/MAPREDUCE-2649) | *Major* | **MR279: Fate of finished Applications on RM**
+* [MAPREDUCE-2037](https://issues.apache.org/jira/browse/MAPREDUCE-2037) | *Major* | **Capturing interim progress times, CPU usage, and memory usage, when tasks reach certain progress thresholds**
 
-New config added:
+Capture intermediate task resource consumption information:
+\* Time taken so far
+\* CPU load [either at the time the data are taken, or exponentially smoothed]
+\* Memory load [also either at the time the data are taken, or exponentially smoothed]
 
-   // the maximum number of completed applications the RM keeps \<name\>yarn.server.resourcemanager.expire.applications.completed.max\</name\>
+This would be taken at intervals that depend on the task progress plateaus. For example, reducers have three progress ranges - [0-1/3], (1/3-2/3], and (2/3-3/3] - where fundamentally different activities happen. Mappers have different boundaries that are not symmetrically placed [0-9/10], (9/10-1]. Data capture boundaries should coincide with activity boundaries. For the state information capture [CPU and memory] we should average over the covered interval.
 
 
 ---
 
-* [MAPREDUCE-2606](https://issues.apache.org/jira/browse/MAPREDUCE-2606) | *Major* | **Remove IsolationRunner**
+* [MAPREDUCE-901](https://issues.apache.org/jira/browse/MAPREDUCE-901) | *Major* | **Move Framework Counters into a TaskMetric structure**
 
-IsolationRunner is no longer maintained. See MAPREDUCE-2637 for its replacement.
+Efficient implementation of MapReduce framework counters.
 
 
 ---
 
-* [MAPREDUCE-2596](https://issues.apache.org/jira/browse/MAPREDUCE-2596) | *Major* | **Gridmix should notify job failures**
+* [MAPREDUCE-1738](https://issues.apache.org/jira/browse/MAPREDUCE-1738) | *Major* | **MapReduce portion of HADOOP-6728 (ovehaul metrics framework)**
 
-Gridmix now prints a summary information after every run. It summarizes the runs w.r.t input trace details, input data statistics, cli arguments, data-gen runtime, simulation runtimes etc and also the cluster w.r.t map slots, reduce slots, jobtracker-address, hdfs-address etc.
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [MAPREDUCE-2563](https://issues.apache.org/jira/browse/MAPREDUCE-2563) | *Major* | **Gridmix high ram jobs emulation system tests.**
-
-Adds system tests to test the High-Ram feature in Gridmix.
+* [MAPREDUCE-279](https://issues.apache.org/jira/browse/MAPREDUCE-279) | *Major* | **Map-Reduce 2.0**
 
+MapReduce has undergone a complete re-haul in hadoop-0.23 and we now have, what we call, MapReduce 2.0 (MRv2).
 
----
+The fundamental idea of MRv2 is to split up the two major functionalities of the JobTracker, resource management and job scheduling/monitoring, into separate daemons. The idea is to have a global ResourceManager (RM) and per-application ApplicationMaster (AM).  An application is either a single job in the classical sense of Map-Reduce jobs or a DAG of jobs. The ResourceManager and per-node slave, the NodeManager (NM), form the data-computation framework. The ResourceManager is the ultimate authority that arbitrates resources among all the applications in the system. The per-application ApplicationMaster is, in effect, a framework specific library and is tasked with negotiating resources from the ResourceManager and working with the NodeManager(s) to execute and monitor the tasks.
 
-* [MAPREDUCE-2554](https://issues.apache.org/jira/browse/MAPREDUCE-2554) | *Major* | **Gridmix distributed cache emulation system tests.**
+The ResourceManager has two main components:
+\* Scheduler (S)
+\* ApplicationsManager (ASM)
 
-Adds distributed cache related system tests to Gridmix.
+The Scheduler is responsible for allocating resources to the various running applications subject to familiar constraints of capacities, queues etc. The Scheduler is pure scheduler in the sense that it performs no monitoring or tracking of status for the application. Also, it offers no guarantees on restarting failed tasks either due to application failure or hardware failures. The Scheduler performs its scheduling function based the resource requirements of the applications; it does so based on the abstract notion of a Resource Container which incorporates elements such as memory, cpu, disk, network etc.
 
+The Scheduler has a pluggable policy plug-in, which is responsible for partitioning the cluster resources among the various queues, applications etc. The current Map-Reduce schedulers such as the CapacityScheduler and the FairScheduler would be some examples of the plug-in.
 
----
+The CapacityScheduler supports hierarchical queues to allow for more predictable sharing of cluster resources.
+The ApplicationsManager is responsible for accepting job-submissions, negotiating the first container for executing the application specific ApplicationMaster and provides the service for restarting the ApplicationMaster container on failure.
 
-* [MAPREDUCE-2544](https://issues.apache.org/jira/browse/MAPREDUCE-2544) | *Major* | **Gridmix compression emulation system tests.**
+The NodeManager is the per-machine framework agent who is responsible for launching the applications' containers, monitoring their resource usage (cpu, memory, disk, network) and reporting the same to the Scheduler.
 
-Adds system tests for testing the compression emulation feature of Gridmix.
+The per-application ApplicationMaster has the responsibility of negotiating appropriate resource containers from the Scheduler, tracking their status and monitoring for progress.
 
 
 ---
 
-* [MAPREDUCE-2543](https://issues.apache.org/jira/browse/MAPREDUCE-2543) | *Major* | **[Gridmix] Add support for HighRam jobs**
+* [HADOOP-7264](https://issues.apache.org/jira/browse/HADOOP-7264) | *Major* | **Bump avro version to at least 1.4.1**
 
-Adds High-Ram feature emulation in Gridmix.
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [MAPREDUCE-2529](https://issues.apache.org/jira/browse/MAPREDUCE-2529) | *Major* | **Recognize Jetty bug 1342 and handle it**
+* [MAPREDUCE-2649](https://issues.apache.org/jira/browse/MAPREDUCE-2649) | *Major* | **MR279: Fate of finished Applications on RM**
 
-Added 2 new config parameters:
+New config added:
 
-mapreduce.reduce.shuffle.catch.exception.stack.regex
-mapreduce.reduce.shuffle.catch.exception.message.regex
+   // the maximum number of completed applications the RM keeps \<name\>yarn.server.resourcemanager.expire.applications.completed.max\</name\>
 
 
 ---
 
-* [MAPREDUCE-2521](https://issues.apache.org/jira/browse/MAPREDUCE-2521) | *Major* | **Mapreduce RPM integration project**
+* [MAPREDUCE-2846](https://issues.apache.org/jira/browse/MAPREDUCE-2846) | *Blocker* | **a small % of all tasks fail with DefaultTaskController**
 
-Created rpm and debian packages for MapReduce.
+Fixed a race condition in writing the log index file that caused tasks to 'fail'.
 
 
 ---
 
-* [MAPREDUCE-2517](https://issues.apache.org/jira/browse/MAPREDUCE-2517) | *Major* | **Porting Gridmix v3 system tests into trunk branch.**
+* [HADOOP-7547](https://issues.apache.org/jira/browse/HADOOP-7547) | *Minor* | **Fix the warning in writable classes.[ WritableComparable is a raw type. References to generic type WritableComparable\<T\> should be parameterized  ]**
 
-Adds system tests to Gridmix. These system tests cover various features like job types (load and sleep), user resolvers (round-robin, submitter-user, echo) and  submission modes (stress, replay and serial).
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [MAPREDUCE-2494](https://issues.apache.org/jira/browse/MAPREDUCE-2494) | *Major* | **Make the distributed cache delete entires using LRU priority**
+* [HDFS-1620](https://issues.apache.org/jira/browse/HDFS-1620) | *Minor* | **Rename HdfsConstants -\> HdfsServerConstants, FSConstants -\> HdfsConstants**
 
-Added config option mapreduce.tasktracker.cache.local.keep.pct to the TaskTracker.  It is the target percentage of the local distributed cache that should be kept in between garbage collection runs.  In practice it will delete unused distributed cache entries in LRU order until the size of the cache is less than mapreduce.tasktracker.cache.local.keep.pct of the maximum cache size.  This is a floating point value between 0.0 and 1.0.  The default is 0.95.
+Rename HdfsConstants interface to HdfsServerConstants, FSConstants interface to HdfsConstants
 
 
 ---
 
-* [MAPREDUCE-2492](https://issues.apache.org/jira/browse/MAPREDUCE-2492) | *Major* | **[MAPREDUCE] The new MapReduce API should make available task's progress to the task**
+* [HADOOP-7507](https://issues.apache.org/jira/browse/HADOOP-7507) | *Major* | **jvm metrics all use the same namespace**
 
-Map and Reduce task can access the attempt's overall progress via TaskAttemptContext.
+JVM metrics published to Ganglia now include the process name as part of the gmetric name.
 
 
 ---
 
-* [MAPREDUCE-2483](https://issues.apache.org/jira/browse/MAPREDUCE-2483) | *Major* | **Clean up duplication of dependent jar files**
+* [HADOOP-7119](https://issues.apache.org/jira/browse/HADOOP-7119) | *Major* | **add Kerberos HTTP SPNEGO authentication support to Hadoop JT/NN/DN/TT web-consoles**
 
-Removed duplicated hadoop-common library dependencies.
+Adding support for Kerberos HTTP SPNEGO authentication to the Hadoop web-consoles
 
 
 ---
 
-* [MAPREDUCE-2478](https://issues.apache.org/jira/browse/MAPREDUCE-2478) | *Major* | **MR 279: Improve history server**
+* [HDFS-2338](https://issues.apache.org/jira/browse/HDFS-2338) | *Major* | **Configuration option to enable/disable webhdfs.**
 
-Looks great. I just committed this. Thanks Siddharth!
+Added a conf property dfs.webhdfs.enabled for enabling/disabling webhdfs.
 
 
 ---
 
-* [MAPREDUCE-2474](https://issues.apache.org/jira/browse/MAPREDUCE-2474) | *Minor* | **Add docs to the new API Partitioner on how to access Job Configuration data**
+* [HDFS-2318](https://issues.apache.org/jira/browse/HDFS-2318) | *Major* | **Provide authentication to webhdfs using SPNEGO**
 
-Improve the Partitioner interface's docs to help fetch Job Configuration objects.
+Added two new conf properties dfs.web.authentication.kerberos.principal and dfs.web.authentication.kerberos.keytab for the SPNEGO servlet filter.
 
 
 ---
 
-* [MAPREDUCE-2473](https://issues.apache.org/jira/browse/MAPREDUCE-2473) | *Major* | **MR portion of HADOOP-7214 - Hadoop /usr/bin/groups equivalent**
+* [MAPREDUCE-3042](https://issues.apache.org/jira/browse/MAPREDUCE-3042) | *Major* | **YARN RM fails to start**
 
-Introduces a new command, "mapred groups", which displays what groups are associated with a user as seen by the JobTracker.
+Simple typo fix to allow ResourceManager to start instead of fail
 
 
 ---
 
-* [MAPREDUCE-2469](https://issues.apache.org/jira/browse/MAPREDUCE-2469) | *Major* | **Task counters should also report the total heap usage of the task**
+* [MAPREDUCE-2930](https://issues.apache.org/jira/browse/MAPREDUCE-2930) | *Major* | **Generate state graph from the State Machine Definition**
 
-Task attempt's total heap usage gets recorded and published via counters as COMMITTED\_HEAP\_BYTES.
+Generate state graph from State Machine Definition
 
 
 ---
 
-* [MAPREDUCE-2455](https://issues.apache.org/jira/browse/MAPREDUCE-2455) | *Major* | **Remove deprecated JobTracker.State in favour of JobTrackerStatus**
+* [MAPREDUCE-3081](https://issues.apache.org/jira/browse/MAPREDUCE-3081) | *Major* | **Change the name format for hadoop core and vaidya jar to be hadoop-{core/vaidya}-{version}.jar in vaidya.sh**
 
-**WARNING: No release note provided for this incompatible change.**
+contrib/vaidya/bin/vaidya.sh script fixed to use appropriate jars and classpath
 
 
 ---
 
-* [MAPREDUCE-2434](https://issues.apache.org/jira/browse/MAPREDUCE-2434) | *Major* | **MR-279: ResourceManager metrics**
+* [MAPREDUCE-3041](https://issues.apache.org/jira/browse/MAPREDUCE-3041) | *Blocker* | **Enhance YARN Client-RM protocol to provide access to information such as cluster's Min/Max Resource capabilities similar to that of AM-RM protocol**
 
-I just committed this. Thanks Luke!
+**WARNING: No release note provided for this change.**
 
 
 ---
 
-* [MAPREDUCE-2430](https://issues.apache.org/jira/browse/MAPREDUCE-2430) | *Major* | **Remove mrunit contrib**
+* [HADOOP-7668](https://issues.apache.org/jira/browse/HADOOP-7668) | *Minor* | **Add a NetUtils method that can tell if an InetAddress belongs to local host**
 
-MRUnit is now available as a separate Apache project.
+closing again
 
 
 ---
 
-* [MAPREDUCE-2417](https://issues.apache.org/jira/browse/MAPREDUCE-2417) | *Major* | **In Gridmix, in RoundRobinUserResolver mode, the testing/proxy users are not associated with unique users in a trace**
+* [HDFS-2355](https://issues.apache.org/jira/browse/HDFS-2355) | *Major* | **Federation: enable using the same configuration file across all the nodes in the cluster.**
 
-Fixes Gridmix in RoundRobinUserResolver mode to map testing/proxy users to unique users in a trace.
+This change allows when running multiple namenodes on different hosts, sharing the same configuration file across all the nodes in the cluster (Datanodes, NamNode, BackupNode, SecondaryNameNode), without the need to define dfs.federation.nameservice.id parameter.
 
 
 ---
 
-* [MAPREDUCE-2416](https://issues.apache.org/jira/browse/MAPREDUCE-2416) | *Major* | **In Gridmix, in RoundRobinUserResolver, the list of groups for a user obtained from users-list-file is incorrect**
+* [MAPREDUCE-2719](https://issues.apache.org/jira/browse/MAPREDUCE-2719) | *Major* | **MR-279: Write a shell command application**
 
-Removes the restriction of specifying group names in users-list file for Gridmix in RoundRobinUserResolver mode.
+Adding a simple, DistributedShell application as an alternate framework to MapReduce and to act as an illustrative example for porting applications to YARN.
 
 
 ---
 
-* [MAPREDUCE-2408](https://issues.apache.org/jira/browse/MAPREDUCE-2408) | *Major* | **Make Gridmix emulate usage of data compression**
+* [HADOOP-7691](https://issues.apache.org/jira/browse/HADOOP-7691) | *Major* | **hadoop deb pkg should take a diff group id**
 
-Emulates the MapReduce compression feature in Gridmix. By default, compression emulation is turned on. Compression emulation can be disabled by setting 'gridmix.compression-emulation.enable' to 'false'.  Use 'gridmix.compression-emulation.map-input.decompression-ratio', 'gridmix.compression-emulation.map-output.compression-ratio' and 'gridmix.compression-emulation.reduce-output.compression-ratio' to configure the compression ratios at map input, map output and reduce output side respectively. Currently, compression ratios in the range [0.07, 0.68] are supported. Gridmix auto detects whether map-input, map output and reduce output should emulate compression based on original job's compression related configuration parameters.
+Fixed conflict uid for install packages. (Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2407](https://issues.apache.org/jira/browse/MAPREDUCE-2407) | *Major* | **Make Gridmix emulate usage of Distributed Cache files**
+* [HADOOP-7603](https://issues.apache.org/jira/browse/HADOOP-7603) | *Major* | **Set default hdfs, mapred uid, and hadoop group gid for RPM packages**
 
-Makes Gridmix emulate HDFS based distributed cache files and local file system based distributed cache files.
+Set hdfs uid, mapred uid, and hadoop gid to fixed numbers (201, 202, and 123, respectively).
 
 
 ---
 
-* [MAPREDUCE-2405](https://issues.apache.org/jira/browse/MAPREDUCE-2405) | *Major* | **MR-279: Implement uber-AppMaster (in-cluster LocalJobRunner for MRv2)**
+* [HADOOP-7684](https://issues.apache.org/jira/browse/HADOOP-7684) | *Major* | **jobhistory server and secondarynamenode should have init.d script**
 
-An efficient implementation of small jobs by running all tasks in the MR ApplicationMaster JVM, there-by affecting lower latency.
+Added init.d script for jobhistory server and secondary namenode. (Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2260](https://issues.apache.org/jira/browse/MAPREDUCE-2260) | *Major* | **Remove auto-generated native build files**
+* [MAPREDUCE-3112](https://issues.apache.org/jira/browse/MAPREDUCE-3112) | *Major* | **Calling hadoop cli inside mapreduce job leads to errors**
 
-The native build run when from trunk now requires autotools, libtool and openssl dev libraries.
+Removed inheritance of certain server environment variables (HADOOP\_OPTS and HADOOP\_ROOT\_LOGGER) in task attempt process.
 
 
 ---
 
-* [MAPREDUCE-2254](https://issues.apache.org/jira/browse/MAPREDUCE-2254) | *Major* | **Allow setting of end-of-record delimiter for TextInputFormat**
+* [HADOOP-7715](https://issues.apache.org/jira/browse/HADOOP-7715) | *Major* | **see log4j Error when running mr jobs and certain dfs calls**
 
-TextInputFormat may now split lines with delimiters other than newline, by specifying a configuration parameter "textinputformat.record.delimiter"
+Removed unnecessary security logger configuration. (Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2225](https://issues.apache.org/jira/browse/MAPREDUCE-2225) | *Blocker* | **MultipleOutputs should not require the use of 'Writable'**
+* [HADOOP-7711](https://issues.apache.org/jira/browse/HADOOP-7711) | *Major* | **hadoop-env.sh generated from templates has duplicate info**
 
-MultipleOutputs should not require the use/check of 'Writable' interfaces in key and value classes.
+Fixed recursive sourcing of HADOOP\_OPTS environment variables (Arpit Gupta via Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2207](https://issues.apache.org/jira/browse/MAPREDUCE-2207) | *Major* | **Task-cleanup task should not be scheduled on the node that the task just failed**
+* [HADOOP-7681](https://issues.apache.org/jira/browse/HADOOP-7681) | *Minor* | **log4j.properties is missing properties for security audit and hdfs audit should be changed to info**
 
-Task-cleanup task should not be scheduled on the node that the task just failed
+HADOOP-7681. Fixed security and hdfs audit log4j properties
+(Arpit Gupta via Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2153](https://issues.apache.org/jira/browse/MAPREDUCE-2153) | *Major* | **Bring in more job configuration properties in to the trace file**
+* [HADOOP-7708](https://issues.apache.org/jira/browse/HADOOP-7708) | *Critical* | **config generator does not update the properties file if on exists already**
 
-Adds job configuration parameters to the job trace. The configuration parameters are stored under the 'jobProperties' field as key-value pairs.
+Fixed hadoop-setup-conf.sh to handle config file consistently.  (Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2137](https://issues.apache.org/jira/browse/MAPREDUCE-2137) | *Major* | **Mapping between Gridmix jobs and the corresponding original MR jobs is needed**
+* [HADOOP-7707](https://issues.apache.org/jira/browse/HADOOP-7707) | *Major* | **improve config generator to allow users to specify proxy user, turn append on or off, turn webhdfs on or off**
 
-New configuration properties gridmix.job.original-job-id and gridmix.job.original-job-name in the configuration of simulated job are exposed/documented to gridmix user for mapping between original cluster's jobs and simulated jobs.
+Added toggle for dfs.support.append, webhdfs and hadoop proxy user to setup config script. (Arpit Gupta via Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2107](https://issues.apache.org/jira/browse/MAPREDUCE-2107) | *Major* | **Emulate Memory Usage of Tasks in GridMix3**
+* [HADOOP-7720](https://issues.apache.org/jira/browse/HADOOP-7720) | *Major* | **improve the hadoop-setup-conf.sh to read in the hbase user and setup the configs**
 
-Adds total heap usage emulation to Gridmix. Also, Gridmix can configure the simulated task's JVM heap options with max heap options obtained from the original task (via Rumen). Use 'gridmix.task.jvm-options.enable' to disable the task max heap options configuration.
+Added parameter for HBase user to setup config script. (Arpit Gupta via Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2106](https://issues.apache.org/jira/browse/MAPREDUCE-2106) | *Major* | **Emulate CPU Usage of Tasks in GridMix3**
+* [MAPREDUCE-2702](https://issues.apache.org/jira/browse/MAPREDUCE-2702) | *Blocker* | **[MR-279] OutputCommitter changes for MR Application Master recovery**
 
-Adds cumulative cpu usage emulation to Gridmix
+Enhance OutputCommitter and FileOutputCommitter to allow for recover of tasks across job restart.
 
 
 ---
 
-* [MAPREDUCE-2104](https://issues.apache.org/jira/browse/MAPREDUCE-2104) | *Major* | **Rumen TraceBuilder Does Not Emit CPU/Memory Usage Details in Traces**
+* [HADOOP-7724](https://issues.apache.org/jira/browse/HADOOP-7724) | *Major* | **hadoop-setup-conf.sh should put proxy user info into the core-site.xml**
 
-Adds cpu, physical memory, virtual memory and heap usages to TraceBuilder's output.
+Fixed hadoop-setup-conf.sh to put proxy user in core-site.xml.  (Arpit Gupta via Eric Yang)
 
 
 ---
 
-* [MAPREDUCE-2037](https://issues.apache.org/jira/browse/MAPREDUCE-2037) | *Major* | **Capturing interim progress times, CPU usage, and memory usage, when tasks reach certain progress thresholds**
-
-Capture intermediate task resource consumption information:
-\* Time taken so far
-\* CPU load [either at the time the data are taken, or exponentially smoothed]
-\* Memory load [also either at the time the data are taken, or exponentially smoothed]
+* [MAPREDUCE-3157](https://issues.apache.org/jira/browse/MAPREDUCE-3157) | *Major* | **Rumen TraceBuilder is skipping analyzing 0.20 history files**
 
-This would be taken at intervals that depend on the task progress plateaus. For example, reducers have three progress ranges - [0-1/3], (1/3-2/3], and (2/3-3/3] - where fundamentally different activities happen. Mappers have different boundaries that are not symmetrically placed [0-9/10], (9/10-1]. Data capture boundaries should coincide with activity boundaries. For the state information capture [CPU and memory] we should average over the covered interval.
+Fixes TraceBuilder to handle 0.20 history file names also.
 
 
 ---
 
-* [MAPREDUCE-1996](https://issues.apache.org/jira/browse/MAPREDUCE-1996) | *Trivial* | **API: Reducer.reduce() method detail misstatement**
+* [MAPREDUCE-3166](https://issues.apache.org/jira/browse/MAPREDUCE-3166) | *Major* | **Make Rumen use job history api instead of relying on current history file name format**
 
-Fix a misleading documentation note about the usage of Reporter objects in Reducers.
+Makes Rumen use job history api instead of relying on current history file name format.
 
 
 ---
 
-* [MAPREDUCE-1978](https://issues.apache.org/jira/browse/MAPREDUCE-1978) | *Major* | **[Rumen] TraceBuilder should provide recursive input folder scanning**
+* [MAPREDUCE-2789](https://issues.apache.org/jira/browse/MAPREDUCE-2789) | *Major* | **[MR:279] Update the scheduling info on CLI**
 
-Adds -recursive option to TraceBuilder for scanning the input directories recursively.
+"mapred/job -list" now contains map/reduce, container, and resource information.
 
 
 ---
 
-* [MAPREDUCE-1906](https://issues.apache.org/jira/browse/MAPREDUCE-1906) | *Major* | **Lower default minimum heartbeat interval for tasktracker \> Jobtracker**
+* [MAPREDUCE-2764](https://issues.apache.org/jira/browse/MAPREDUCE-2764) | *Major* | **Fix renewal of dfs delegation tokens**
 
-The default minimum heartbeat interval has been dropped from 3 seconds to 300ms to increase scheduling throughput on small clusters. Users may tune mapreduce.jobtracker.heartbeats.in.second to adjust this value.
+Generalizes token renewal and canceling to a common interface and provides a plugin interface for adding renewers for new kinds of tokens. Hftp changed to store the tokens as HFTP and renew them over http.
 
 
 ---
 
-* [MAPREDUCE-1811](https://issues.apache.org/jira/browse/MAPREDUCE-1811) | *Minor* | **Job.monitorAndPrintJob() should print status of the job at completion**
+* [HADOOP-7655](https://issues.apache.org/jira/browse/HADOOP-7655) | *Major* | **provide a small validation script that smoke tests the installed cluster**
 
-Print the resultant status of a Job on completion instead of simply saying 'Complete'.
+Committed to trunk and v23, since code reviewed by Eric.
 
 
 ---
 
-* [MAPREDUCE-1738](https://issues.apache.org/jira/browse/MAPREDUCE-1738) | *Major* | **MapReduce portion of HADOOP-6728 (ovehaul metrics framework)**
+* [MAPREDUCE-2858](https://issues.apache.org/jira/browse/MAPREDUCE-2858) | *Blocker* | **MRv2 WebApp Security**
+
+A new server has been added to yarn.  It is a web proxy that sits in front of the AM web UI.  The server is controlled by the yarn.web-proxy.address config.  If that config is set, and it points to an address that is different then the RM web interface then a separate proxy server needs to be launched.
+
+This can be done by running
+
+yarn-daemon.sh start proxyserver
 
-**WARNING: No release note provided for this incompatible change.**
+If a separate proxy server is needed other configs also may need to be set, if security is enabled.
+yarn.web-proxy.principal
+yarn.web-proxy.keytab
+
+The proxy server is stateless and should be able to support a VIP or other load balancing sitting in front of multiple instances of this server.
 
 
 ---
 
-* [MAPREDUCE-1461](https://issues.apache.org/jira/browse/MAPREDUCE-1461) | *Major* | **Feature to instruct rumen-folder utility to skip jobs worth of specific duration**
+* [MAPREDUCE-3205](https://issues.apache.org/jira/browse/MAPREDUCE-3205) | *Blocker* | **MR2 memory limits should be pmem, not vmem**
 
-Added a ''-starts-after' option to Rumen's Folder utility. The time duration specified after the '-starts-after' option is an offset with respect to the submit time of the first job in the input trace. Jobs in the input trace having a submit time (relative to the first job's submit time) lesser than the specified offset will be ignored.
+Resource limits are now expressed and enforced in terms of physical memory, rather than virtual memory. The virtual memory limit is set as a configurable multiple of the physical limit. The NodeManager's memory usage is now configured in units of MB rather than GB.
 
 
 ---
 
-* [MAPREDUCE-1242](https://issues.apache.org/jira/browse/MAPREDUCE-1242) | *Trivial* | **Chain APIs error misleading**
+* [HDFS-1869](https://issues.apache.org/jira/browse/HDFS-1869) | *Major* | **mkdirs should use the supplied permission for all of the created directories**
 
-Fix a misleading exception message in case the Chained Mappers have mismatch in input/output Key/Value pairs between them.
+A multi-level mkdir is now POSIX compliant.  Instead of creating intermediate directories with the permissions of the parent directory, intermediate directories are created with permission bits of rwxrwxrwx (0777) as modified by the current umask, plus write and search permission for the owner.
 
 
 ---
 
-* [MAPREDUCE-1159](https://issues.apache.org/jira/browse/MAPREDUCE-1159) | *Trivial* | **Limit Job name on jobtracker.jsp to be 80 char long**
+* [HADOOP-7728](https://issues.apache.org/jira/browse/HADOOP-7728) | *Major* | **hadoop-setup-conf.sh should be modified to enable task memory manager**
 
-Job names on jobtracker.jsp should be 80 characters long at most.
+Enable task memory management to be configurable via hadoop config setup script.
 
 
 ---
 
-* [MAPREDUCE-993](https://issues.apache.org/jira/browse/MAPREDUCE-993) | *Minor* | **bin/hadoop job -events \<jobid\> \<from-event-#\> \<#-of-events\> help message is confusing**
+* [MAPREDUCE-3186](https://issues.apache.org/jira/browse/MAPREDUCE-3186) | *Blocker* | **User jobs are getting hanged if the Resource manager process goes down and comes up while job is getting executed.**
+
+New Yarn configuration property:
 
-Added a helpful description message to the `mapred job -events` command.
+Name: yarn.app.mapreduce.am.scheduler.connection.retries
+Description: Number of times AM should retry to contact RM if connection is lost.
 
 
 ---
 
-* [MAPREDUCE-901](https://issues.apache.org/jira/browse/MAPREDUCE-901) | *Major* | **Move Framework Counters into a TaskMetric structure**
+* [MAPREDUCE-2736](https://issues.apache.org/jira/browse/MAPREDUCE-2736) | *Major* | **Remove unused contrib components dependent on MR1**
 
-Efficient implementation of MapReduce framework counters.
+The pre-MR2 MapReduce implementation (JobTracker, TaskTracer, etc) and contrib components are no longer supported. This implementation is currently supported in the 0.20.20x releases.
 
 
 ---
 
-* [MAPREDUCE-587](https://issues.apache.org/jira/browse/MAPREDUCE-587) | *Minor* | **Stream test TestStreamingExitStatus fails with Out of Memory**
+* [HADOOP-7740](https://issues.a

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