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From acmur...@apache.org
Subject svn commit: r1391967 [2/2] - /hadoop/common/branches/branch-2.0.2-alpha/hadoop-common-project/hadoop-common/src/main/docs/releasenotes.html
Date Sun, 30 Sep 2012 08:28:11 GMT

Modified: hadoop/common/branches/branch-2.0.2-alpha/hadoop-common-project/hadoop-common/src/main/docs/releasenotes.html
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2.0.2-alpha/hadoop-common-project/hadoop-common/src/main/docs/releasenotes.html?rev=1391967&r1=1391966&r2=1391967&view=diff
==============================================================================
--- hadoop/common/branches/branch-2.0.2-alpha/hadoop-common-project/hadoop-common/src/main/docs/releasenotes.html (original)
+++ hadoop/common/branches/branch-2.0.2-alpha/hadoop-common-project/hadoop-common/src/main/docs/releasenotes.html Sun Sep 30 08:28:10 2012
@@ -12,6 +12,28 @@ These release notes include new develope
 <a name="changes"/>
 <h2>Changes since Hadoop 2.0.1-alpha</h2>
 <ul>
+<li> <a href="https://issues.apache.org/jira/browse/YARN-137">YARN-137</a>.
+     Major improvement reported by Siddharth Seth and fixed by Siddharth Seth (scheduler)<br>
+     <b>Change the default scheduler to the CapacityScheduler</b><br>
+     <blockquote>There's some bugs in the FifoScheduler atm - doesn't distribute tasks across nodes and some headroom (available resource) issues.
+That's not the best experience for users trying out the 2.0 branch. The CS with the default configuration of a single queue behaves the same as the FifoScheduler and doesn't have these issues.
+</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/YARN-108">YARN-108</a>.
+     Critical bug reported by Jason Lowe and fixed by Jason Lowe (nodemanager)<br>
+     <b>FSDownload can create cache directories with the wrong permissions</b><br>
+     <blockquote>When the cluster is configured with a restrictive umask, e.g.: {{fs.permissions.umask-mode=0077}}, the nodemanager can end up creating directory entries in the public cache with the wrong permissions.  The permissions can end up where only the nodemanager user can access files in the public cache, preventing jobs from running properly.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/YARN-106">YARN-106</a>.
+     Major bug reported by Jason Lowe and fixed by Jason Lowe (nodemanager)<br>
+     <b>Nodemanager needs to set permissions of local directories</b><br>
+     <blockquote>If the nodemanager process is running with a restrictive default umask (e.g.: 0077) then it will create its local directories with permissions that are too restrictive to allow containers from other users to run.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/YARN-88">YARN-88</a>.
+     Major bug reported by Jason Lowe and fixed by Jason Lowe (nodemanager)<br>
+     <b>DefaultContainerExecutor can fail to set proper permissions</b><br>
+     <blockquote>{{DefaultContainerExecutor}} can fail to set the proper permissions on its local directories if the cluster has been configured with a restrictive umask, e.g.: fs.permissions.umask-mode=0077.  The configured umask ends up defeating the permissions requested by {{DefaultContainerExecutor}} when it creates directories.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/YARN-87">YARN-87</a>.
+     Critical bug reported by Jason Lowe and fixed by Jason Lowe (nodemanager)<br>
+     <b>NM ResourceLocalizationService does not set permissions of local cache directories</b><br>
+     <blockquote>{{ResourceLocalizationService}} creates a file cache and user cache directory when it starts up but doesn't specify the permissions for them when they are created.  If the cluster configs are set to limit the default permissions (e.g.: fs.permissions.umask-mode=0077 instead of the default 0022), then the cache directories are created with too-restrictive permissions and no jobs are able to run.</blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/YARN-83">YARN-83</a>.
      Major bug reported by Bikas Saha and fixed by Bikas Saha (client)<br>
      <b>Change package of YarnClient to include apache</b><br>
@@ -250,10 +272,22 @@ The details are in:https://builds.apache
      Major task reported by Arun C Murthy and fixed by Arun C Murthy <br>
      <b>Move YARN out of hadoop-mapreduce</b><br>
      <blockquote>Move YARN out of hadoop-mapreduce-project into hadoop-yarn-project in hadoop trunk</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4691">MAPREDUCE-4691</a>.
+     Critical bug reported by Jason Lowe and fixed by Robert Joseph Evans (jobhistoryserver , mrv2)<br>
+     <b>Historyserver can report "Unknown job" after RM says job has completed</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4689">MAPREDUCE-4689</a>.
+     Major bug reported by Jason Lowe and fixed by Jason Lowe (client)<br>
+     <b>JobClient.getMapTaskReports on failed job results in NPE</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4649">MAPREDUCE-4649</a>.
      Major bug reported by Vinod Kumar Vavilapalli and fixed by Vinod Kumar Vavilapalli (jobhistoryserver)<br>
      <b>mr-jobhistory-daemon.sh needs to be updated post YARN-1</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4647">MAPREDUCE-4647</a>.
+     Major bug reported by Robert Joseph Evans and fixed by Robert Joseph Evans (mrv2)<br>
+     <b>We should only unjar jobjar if there is a lib directory in it.</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4646">MAPREDUCE-4646</a>.
      Major bug reported by Jason Lowe and fixed by Jason Lowe (mrv2)<br>
      <b>client does not receive job diagnostics for failed jobs</b><br>
@@ -518,10 +552,6 @@ The details are in:https://builds.apache
      Major new feature reported by Karthik Kambatla and fixed by Karthik Kambatla (mrv1 , mrv2)<br>
      <b>Add RunningJob.getJobStatus()</b><br>
      <blockquote></blockquote></li>
-<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4342">MAPREDUCE-4342</a>.
-     Major bug reported by Mayank Bansal and fixed by Mayank Bansal <br>
-     <b>Distributed Cache gives inconsistent result if cache files get deleted from task tracker </b><br>
-     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4341">MAPREDUCE-4341</a>.
      Major bug reported by Thomas Graves and fixed by Karthik Kambatla (capacity-sched , mrv2)<br>
      <b>add types to capacity scheduler properties documentation</b><br>
@@ -550,6 +580,10 @@ The details are in:https://builds.apache
      Major bug reported by Ahmed Radwan and fixed by Ahmed Radwan (mrv2)<br>
      <b>Problem running Distributed Shell applications as a user other than the one started the daemons</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4302">MAPREDUCE-4302</a>.
+     Critical bug reported by Daryn Sharp and fixed by Daryn Sharp (nodemanager)<br>
+     <b>NM goes down if error encountered during log aggregation</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4301">MAPREDUCE-4301</a>.
      Major improvement reported by Robert Joseph Evans and fixed by Robert Joseph Evans (applicationmaster)<br>
      <b>Dedupe some strings in MRAM for memory savings</b><br>
@@ -918,10 +952,6 @@ The details are in:https://builds.apache
      Critical bug reported by MengWang and fixed by Bhallamudi Venkata Siva Kamesh (mrv2)<br>
      <b>Shuffle hang when set map.failures.percent</b><br>
      <blockquote></blockquote></li>
-<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3921">MAPREDUCE-3921</a>.
-     Major improvement reported by Vinod Kumar Vavilapalli and fixed by Bikas Saha (mr-am , mrv2)<br>
-     <b>MR AM should act on the nodes liveliness information when nodes go up/down/unhealthy</b><br>
-     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3907">MAPREDUCE-3907</a>.
      Minor improvement reported by Eugene Koontz and fixed by Eugene Koontz (documentation)<br>
      <b>Document entries mapred-default.xml for the jobhistory server.</b><br>
@@ -950,6 +980,10 @@ The details are in:https://builds.apache
      Major bug reported by Bhallamudi Venkata Siva Kamesh and fixed by Bhallamudi Venkata Siva Kamesh (mrv2)<br>
      <b>Invalid App Metrics</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3850">MAPREDUCE-3850</a>.
+     Major improvement reported by Daryn Sharp and fixed by Daryn Sharp (security)<br>
+     <b>Avoid redundant calls for tokens in TokenCache</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3842">MAPREDUCE-3842</a>.
      Critical improvement reported by Alejandro Abdelnur and fixed by Thomas Graves (mrv2 , webapps)<br>
      <b>stop webpages from automatic refreshing</b><br>
@@ -1064,14 +1098,14 @@ If this is merged to more then trunk, th
      Minor new feature reported by Philip Zeyliger and fixed by Ahmed Radwan (build , test)<br>
      <b>Exposing MiniDFS and MiniMR clusters as a single process command-line</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3972">HDFS-3972</a>.
+     Critical bug reported by Todd Lipcon and fixed by Todd Lipcon (name-node)<br>
+     <b>Trash emptier fails in secure HA cluster</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HDFS-3928">HDFS-3928</a>.
      Major bug reported by Eli Collins and fixed by Eli Collins (test)<br>
      <b>MiniDFSCluster should reset the first ExitException on shutdown</b><br>
      <blockquote></blockquote></li>
-<li> <a href="https://issues.apache.org/jira/browse/HDFS-3910">HDFS-3910</a>.
-     Minor improvement reported by Eli Collins and fixed by Eli Collins (test)<br>
-     <b>DFSTestUtil#waitReplication should timeout</b><br>
-     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HDFS-3902">HDFS-3902</a>.
      Minor bug reported by Andy Isaacson and fixed by Andy Isaacson <br>
      <b>TestDatanodeBlockScanner#testBlockCorruptionPolicy is broken</b><br>
@@ -1236,6 +1270,10 @@ If this is merged to more then trunk, th
      Minor bug reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe (fuse-dfs)<br>
      <b>fuse_dfs: incorrect configuration value checked for connection expiry timer period</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3731">HDFS-3731</a>.
+     Blocker bug reported by Suresh Srinivas and fixed by Kihwal Lee (data-node)<br>
+     <b>2.0 release upgrade must handle blocks being written from 1.0</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HDFS-3724">HDFS-3724</a>.
      Major bug reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur <br>
      <b>add InterfaceAudience annotations to HttpFS classes and making inner enum static</b><br>
@@ -1328,10 +1366,6 @@ If this is merged to more then trunk, th
      Major improvement reported by Eli Collins and fixed by Eli Collins (test)<br>
      <b>MiniDFSCluster should capture the code path that led to the first ExitException </b><br>
      <blockquote></blockquote></li>
-<li> <a href="https://issues.apache.org/jira/browse/HDFS-3659">HDFS-3659</a>.
-     Minor improvement reported by Brandon Li and fixed by Brandon Li (documentation)<br>
-     <b>Add missing @Override to methods across the hadoop-hdfs project</b><br>
-     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HDFS-3658">HDFS-3658</a>.
      Major bug reported by Eli Collins and fixed by Tsz Wo (Nicholas), SZE <br>
      <b>TestDFSClientRetries#testNamenodeRestart failed</b><br>
@@ -1364,6 +1398,10 @@ If this is merged to more then trunk, th
      Trivial bug reported by Brandon Li and fixed by Brandon Li (name-node)<br>
      <b>fix the typo in the error message about inconsistent storage layout version</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3622">HDFS-3622</a>.
+     Major bug reported by Robert Joseph Evans and fixed by Robert Joseph Evans <br>
+     <b>Backport HDFS-3541 to branch-0.23</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HDFS-3615">HDFS-3615</a>.
      Major bug reported by Eli Collins and fixed by Aaron T. Myers (security)<br>
      <b>Two BlockTokenSecretManager findbugs warnings</b><br>
@@ -1732,10 +1770,6 @@ Please see hdfs-default.xml for detailed
      Critical bug reported by Todd Lipcon and fixed by Todd Lipcon (hdfs client)<br>
      <b>DFSClient.close should close cached sockets</b><br>
      <blockquote></blockquote></li>
-<li> <a href="https://issues.apache.org/jira/browse/HDFS-3343">HDFS-3343</a>.
-     Major improvement reported by Todd Lipcon and fixed by Andrew Wang (data-node)<br>
-     <b>Improve metrics for DN read latency</b><br>
-     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HDFS-3341">HDFS-3341</a>.
      Minor improvement reported by Todd Lipcon and fixed by Todd Lipcon <br>
      <b>Change minimum RPC versions to 2.0.0-SNAPSHOT instead of 2.0.0</b><br>
@@ -1768,6 +1802,10 @@ Please see hdfs-default.xml for detailed
      Critical bug reported by Daryn Sharp and fixed by Daryn Sharp (webhdfs)<br>
      <b>hftp/webhdfs can't get tokens if authority has no port</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3306">HDFS-3306</a>.
+     Minor bug reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe <br>
+     <b>fuse_dfs: don't lock release operations</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HDFS-3291">HDFS-3291</a>.
      Major test reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur <br>
      <b>add test that covers HttpFS working w/ a non-HDFS Hadoop filesystem</b><br>
@@ -2132,10 +2170,6 @@ Please see hdfs-default.xml for detailed
      Major improvement reported by Eli Collins and fixed by Eli Collins (fs)<br>
      <b>Make trash a server side configuration option</b><br>
      <blockquote>If fs.trash.interval is configured on the server then the client's value for this configuration is ignored. </blockquote></li>
-<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8687">HADOOP-8687</a>.
-     Minor improvement reported by Eli Collins and fixed by Eli Collins <br>
-     <b>Upgrade log4j to 1.2.17</b><br>
-     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HADOOP-8686">HADOOP-8686</a>.
      Minor bug reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe (native)<br>
      <b>Fix warnings in native code</b><br>
@@ -2168,6 +2202,10 @@ Please see hdfs-default.xml for detailed
      Critical bug reported by Daryn Sharp and fixed by Daryn Sharp (fs)<br>
      <b>FilterFileSystem#setWriteChecksum is broken</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8635">HADOOP-8635</a>.
+     Critical improvement reported by Daryn Sharp and fixed by Daryn Sharp (fs)<br>
+     <b>Cannot cancel paths registered deleteOnExit</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HADOOP-8634">HADOOP-8634</a>.
      Critical bug reported by Daryn Sharp and fixed by Daryn Sharp (fs)<br>
      <b>Ensure FileSystem#close doesn't squawk for deleteOnExit paths</b><br>
@@ -2532,10 +2570,6 @@ Please see hdfs-default.xml for detailed
      Major bug reported by Radim Kolar and fixed by Radim Kolar (build)<br>
      <b>A few pom.xml across Hadoop project may fail XML validation</b><br>
      <blockquote></blockquote></li>
-<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8249">HADOOP-8249</a>.
-     Major bug reported by bc Wong and fixed by Alejandro Abdelnur (security)<br>
-     <b>invalid hadoop-auth cookies should trigger authentication if info is avail before returning HTTP 401</b><br>
-     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HADOOP-8244">HADOOP-8244</a>.
      Major improvement reported by Henry Robinson and fixed by Henry Robinson <br>
      <b>Improve comments on ByteBufferReadable.read</b><br>
@@ -2568,6 +2602,10 @@ Please see hdfs-default.xml for detailed
      Critical bug reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur (conf)<br>
      <b>Configuration logs WARNs on every use of a deprecated key</b><br>
      <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8180">HADOOP-8180</a>.
+     Major bug reported by Ravi Prakash and fixed by Ravi Prakash <br>
+     <b>Remove hsqldb since its not needed from pom.xml</b><br>
+     <blockquote></blockquote></li>
 <li> <a href="https://issues.apache.org/jira/browse/HADOOP-8179">HADOOP-8179</a>.
      Minor bug reported by Steve Loughran and fixed by Daryn Sharp (fs)<br>
      <b>risk of NPE in CopyCommands processArguments()</b><br>
@@ -2670,3 +2708,8019 @@ Please see hdfs-default.xml for detailed
      <blockquote></blockquote></li>
 </ul>
 </body></html>
+<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Hadoop  2.0.1-alpha Release Notes</title>
+<STYLE type="text/css">
+	H1 {font-family: sans-serif}
+	H2 {font-family: sans-serif; margin-left: 7mm}
+	TABLE {margin-left: 7mm}
+</STYLE>
+</head>
+<body>
+<h1>Hadoop  2.0.1-alpha Release Notes</h1>
+These release notes include new developer and user-facing incompatibilities, features, and major improvements. 
+<a name="changes"/>
+<h2>Changes since Hadoop 2.0.0-alpha</h2>
+<ul>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8552">HADOOP-8552</a>.
+     Major bug reported by Karthik Kambatla and fixed by Karthik Kambatla (conf , security)<br>
+     <b>Conflict: Same security.log.file for multiple users. </b><br>
+     <blockquote></blockquote></li>
+</ul>
+</body></html>
+<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Hadoop  2.0.0-alpha Release Notes</title>
+<STYLE type="text/css">
+	H1 {font-family: sans-serif}
+	H2 {font-family: sans-serif; margin-left: 7mm}
+	TABLE {margin-left: 7mm}
+</STYLE>
+</head>
+<body>
+<h1>Hadoop  2.0.0-alpha Release Notes</h1>
+These release notes include new developer and user-facing incompatibilities, features, and major improvements. 
+<a name="changes"/>
+<h2>Changes since Hadoop 0.23.2</h2>
+<ul>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4274">MAPREDUCE-4274</a>.
+     Minor improvement reported by Todd Lipcon and fixed by Todd Lipcon (performance , task)<br>
+     <b>MapOutputBuffer should use native byte order for kvmeta</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4231">MAPREDUCE-4231</a>.
+     Major bug reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (contrib/raid)<br>
+     <b>Update RAID to not to use FSInodeInfo</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4219">MAPREDUCE-4219</a>.
+     Major improvement reported by Roman Shaposhnik and fixed by Roman Shaposhnik (security)<br>
+     <b>make default container-executor.conf.dir be a path relative to the container-executor binary</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4202">MAPREDUCE-4202</a>.
+     Major bug reported by Daryn Sharp and fixed by Daryn Sharp (test)<br>
+     <b>TestYarnClientProtocolProvider is broken</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4193">MAPREDUCE-4193</a>.
+     Major bug reported by Patrick Hunt and fixed by Patrick Hunt (documentation)<br>
+     <b>broken doc link for yarn-default.xml in site.xml</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4147">MAPREDUCE-4147</a>.
+     Major bug reported by Tom White and fixed by Tom White <br>
+     <b>YARN should not have a compile-time dependency on HDFS</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4138">MAPREDUCE-4138</a>.
+     Major improvement reported by Tom White and fixed by Tom White <br>
+     <b>Reduce memory usage of counters due to non-static nested classes</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4113">MAPREDUCE-4113</a>.
+     Major sub-task reported by Devaraj K and fixed by Devaraj K (mrv2 , test)<br>
+     <b>Fix tests org.apache.hadoop.mapred.TestClusterMRNotification</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4112">MAPREDUCE-4112</a>.
+     Major sub-task reported by Devaraj K and fixed by Devaraj K (mrv2 , test)<br>
+     <b>Fix tests org.apache.hadoop.mapred.TestClusterMapReduceTestCase</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4111">MAPREDUCE-4111</a>.
+     Major sub-task reported by Devaraj K and fixed by Devaraj K (mrv2 , test)<br>
+     <b>Fix tests in org.apache.hadoop.mapred.TestJobName</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4110">MAPREDUCE-4110</a>.
+     Major sub-task reported by Devaraj K and fixed by Devaraj K (mrv2 , test)<br>
+     <b>Fix tests in org.apache.hadoop.mapred.TestMiniMRClasspath &amp; org.apache.hadoop.mapred.TestMiniMRWithDFSWithDistinctUsers</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4108">MAPREDUCE-4108</a>.
+     Major sub-task reported by Devaraj K and fixed by Devaraj K (mrv2)<br>
+     <b>Fix tests in org.apache.hadoop.util.TestRunJar</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4107">MAPREDUCE-4107</a>.
+     Major sub-task reported by Devaraj K and fixed by Devaraj K (mrv2)<br>
+     <b>Fix tests in org.apache.hadoop.ipc.TestSocketFactory</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4105">MAPREDUCE-4105</a>.
+     Major bug reported by Ahmed Radwan and fixed by Ahmed Radwan (mrv2)<br>
+     <b>Yarn RackResolver ignores rack configurations</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4103">MAPREDUCE-4103</a>.
+     Major improvement reported by Todd Lipcon and fixed by Todd Lipcon (documentation)<br>
+     <b>Fix HA docs for changes to shell command fencer args</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4098">MAPREDUCE-4098</a>.
+     Major bug reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur (test)<br>
+     <b>TestMRApps testSetClasspath fails</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4093">MAPREDUCE-4093</a>.
+     Major improvement reported by Devaraj K and fixed by Devaraj K (mrv2)<br>
+     <b>Improve RM WebApp start up when proxy address is not set</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4081">MAPREDUCE-4081</a>.
+     Blocker bug reported by Jason Lowe and fixed by Jason Lowe (build , mrv2)<br>
+     <b>TestMROutputFormat.java does not compile</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4076">MAPREDUCE-4076</a>.
+     Blocker bug reported by Devaraj K and fixed by Devaraj K (mrv2)<br>
+     <b>Stream job fails with ZipException when use yarn jar command</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4066">MAPREDUCE-4066</a>.
+     Minor bug reported by xieguiming and fixed by xieguiming (job submission , mrv2)<br>
+     <b>To get "yarn.app.mapreduce.am.staging-dir" value, should set the default value</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4057">MAPREDUCE-4057</a>.
+     Major bug reported by Tsz Wo (Nicholas), SZE and fixed by Devaraj K (contrib/raid)<br>
+     <b>Compilation error in RAID </b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4008">MAPREDUCE-4008</a>.
+     Major bug reported by Devaraj K and fixed by Devaraj K (mrv2 , scheduler)<br>
+     <b>ResourceManager throws MetricsException on start up saying QueueMetrics MBean already exists</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-4007">MAPREDUCE-4007</a>.
+     Major bug reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur (mrv2)<br>
+     <b>JobClient getJob(JobID) should return NULL if the job does not exist (for backwards compatibility)</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3991">MAPREDUCE-3991</a>.
+     Trivial improvement reported by Harsh J and fixed by Harsh J (documentation)<br>
+     <b>Streaming FAQ has some wrong instructions about input files splitting</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3989">MAPREDUCE-3989</a>.
+     Major improvement reported by Patrick Hunt and fixed by Patrick Hunt <br>
+     <b>cap space usage of default log4j rolling policy (mr specific changes)</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3974">MAPREDUCE-3974</a>.
+     Blocker bug reported by Arun C Murthy and fixed by Aaron T. Myers <br>
+     <b>TestSubmitJob in MR1 tests doesn't compile after HDFS-1623 merge</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3958">MAPREDUCE-3958</a>.
+     Major bug reported by Bikas Saha and fixed by Bikas Saha (mrv2)<br>
+     <b>RM: Remove RMNodeState and replace it with NodeState</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3955">MAPREDUCE-3955</a>.
+     Blocker improvement reported by Jitendra Nath Pandey and fixed by Jitendra Nath Pandey (mrv2)<br>
+     <b>Replace ProtoOverHadoopRpcEngine with ProtobufRpcEngine.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3952">MAPREDUCE-3952</a>.
+     Major bug reported by Zhenxiao Luo and fixed by Bhallamudi Venkata Siva Kamesh (mrv2)<br>
+     <b>In MR2, when Total input paths to process == 1, CombinefileInputFormat.getSplits() returns 0 split.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3935">MAPREDUCE-3935</a>.
+     Major improvement reported by Tom White and fixed by Tom White (client)<br>
+     <b>Annotate Counters.Counter and Counters.Group as @Public</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3933">MAPREDUCE-3933</a>.
+     Major bug reported by Ahmed Radwan and fixed by Ahmed Radwan (mrv2 , test)<br>
+     <b>Failures because MALLOC_ARENA_MAX is not set</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3916">MAPREDUCE-3916</a>.
+     Critical bug reported by Roman Shaposhnik and fixed by Devaraj K (mrv2 , resourcemanager , webapps)<br>
+     <b>various issues with running yarn proxyserver</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3909">MAPREDUCE-3909</a>.
+     Trivial improvement reported by Steve Loughran and fixed by Steve Loughran (mrv2)<br>
+     <b>javadoc the Service interfaces</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3885">MAPREDUCE-3885</a>.
+     Major improvement reported by Devaraj Das and fixed by Devaraj Das (mrv2)<br>
+     <b>Apply the fix similar to HADOOP-8084</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3883">MAPREDUCE-3883</a>.
+     Minor improvement reported by Eugene Koontz and fixed by Eugene Koontz (documentation , mrv2)<br>
+     <b>Document yarn.nodemanager.delete.debug-delay-sec configuration property</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3869">MAPREDUCE-3869</a>.
+     Blocker bug reported by Devaraj K and fixed by Devaraj K (mrv2)<br>
+     <b>Distributed shell application fails with NoClassDefFoundError</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3867">MAPREDUCE-3867</a>.
+     Major bug reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur (test)<br>
+     <b>MiniMRYarn/MiniYarn uses fixed ports</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3818">MAPREDUCE-3818</a>.
+     Blocker bug reported by Vinod Kumar Vavilapalli and fixed by Suresh Srinivas (build , test)<br>
+     <b>Trunk MRV1 compilation is broken.</b><br>
+     <blockquote>Fixed broken compilation in TestSubmitJob after the patch for HDFS-2895.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3740">MAPREDUCE-3740</a>.
+     Blocker bug reported by Devaraj K and fixed by Devaraj K (mrv2)<br>
+     <b>Mapreduce Trunk compilation fails</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3578">MAPREDUCE-3578</a>.
+     Major bug reported by Gilad Wolff and fixed by Tom White (nodemanager)<br>
+     <b>starting nodemanager as 'root' gives "Unknown -jvm option"</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3545">MAPREDUCE-3545</a>.
+     Major bug reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Remove Avro RPC</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3431">MAPREDUCE-3431</a>.
+     Minor bug reported by Steve Loughran and fixed by Steve Loughran (resourcemanager)<br>
+     <b>NPE in Resource Manager shutdown</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3377">MAPREDUCE-3377</a>.
+     Major bug reported by Jane Chen and fixed by Jane Chen <br>
+     <b>Compatibility issue with 0.20.203.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3353">MAPREDUCE-3353</a>.
+     Major bug reported by Vinod Kumar Vavilapalli and fixed by Bikas Saha (applicationmaster , mrv2 , resourcemanager)<br>
+     <b>Need a RM-&gt;AM channel to inform AMs about faulty/unhealthy/lost nodes</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-3173">MAPREDUCE-3173</a>.
+     Critical bug reported by Devaraj K and fixed by Devaraj K (mrv2)<br>
+     <b>MRV2 UI doesn't work properly without internet</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2942">MAPREDUCE-2942</a>.
+     Critical bug reported by Vinod Kumar Vavilapalli and fixed by Thomas Graves <br>
+     <b>TestNMAuditLogger.testNMAuditLoggerWithIP failing</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2934">MAPREDUCE-2934</a>.
+     Major improvement reported by Aaron T. Myers and fixed by Aaron T. Myers (mrv2)<br>
+     <b>MR portion of HADOOP-7607 - Simplify the RPC proxy cleanup process</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/MAPREDUCE-2887">MAPREDUCE-2887</a>.
+     Major improvement reported by Sanjay Radia and fixed by Sanjay Radia <br>
+     <b>MR changes to match HADOOP-7524 (multiple RPC protocols)</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3418">HDFS-3418</a>.
+     Minor improvement reported by Eli Collins and fixed by Eli Collins <br>
+     <b>Rename BlockWithLocationsProto datanodeIDs field to storageIDs</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3396">HDFS-3396</a>.
+     Minor bug reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe (fuse-dfs)<br>
+     <b>FUSE build fails on Ubuntu 12.04</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3395">HDFS-3395</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (name-node)<br>
+     <b>NN doesn't start with HA+security enabled and HTTP address set to 0.0.0.0</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3378">HDFS-3378</a>.
+     Trivial improvement reported by Eli Collins and fixed by Eli Collins <br>
+     <b>Remove DFS_NAMENODE_SECONDARY_HTTPS_PORT_KEY and DEFAULT</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3376">HDFS-3376</a>.
+     Critical bug reported by Todd Lipcon and fixed by Todd Lipcon (hdfs client)<br>
+     <b>DFSClient fails to make connection to DN if there are many unusable cached sockets</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3375">HDFS-3375</a>.
+     Trivial improvement reported by Todd Lipcon and fixed by Todd Lipcon (data-node)<br>
+     <b>Put client name in DataXceiver thread name for readBlock and keepalive</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3365">HDFS-3365</a>.
+     Minor improvement reported by Todd Lipcon and fixed by Todd Lipcon (hdfs client)<br>
+     <b>Enable users to disable socket caching in DFS client configuration</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3363">HDFS-3363</a>.
+     Minor sub-task reported by John George and fixed by John George (name-node)<br>
+     <b>blockmanagement should stop using INodeFile &amp; INodeFileUC </b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3357">HDFS-3357</a>.
+     Critical bug reported by Todd Lipcon and fixed by Todd Lipcon (data-node)<br>
+     <b>DataXceiver reads from client socket with incorrect/no timeout</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3351">HDFS-3351</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (name-node)<br>
+     <b>NameNode#initializeGenericKeys should always set fs.defaultFS regardless of whether HA or Federation is enabled</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3350">HDFS-3350</a>.
+     Major bug reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (name-node)<br>
+     <b>findbugs warning: INodeFileUnderConstruction doesn't override INodeFile.equals(Object)</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3339">HDFS-3339</a>.
+     Minor sub-task reported by John George and fixed by John George (name-node)<br>
+     <b>change INode to package private</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3336">HDFS-3336</a>.
+     Minor bug reported by Roman Shaposhnik and fixed by Roman Shaposhnik (scripts)<br>
+     <b>hdfs launcher script will be better off not special casing namenode command with regards to hadoop.security.logger</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3332">HDFS-3332</a>.
+     Major bug reported by amith and fixed by amith (data-node)<br>
+     <b>NullPointerException in DN when directoryscanner is trying to report bad blocks</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3330">HDFS-3330</a>.
+     Critical bug reported by Todd Lipcon and fixed by Todd Lipcon (name-node)<br>
+     <b>If GetImageServlet throws an Error or RTE, response has HTTP "OK" status</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3328">HDFS-3328</a>.
+     Minor bug reported by Uma Maheswara Rao G and fixed by Eli Collins (data-node)<br>
+     <b>NPE in DataNode.getIpcPort</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3326">HDFS-3326</a>.
+     Trivial bug reported by J.Andreina and fixed by Matthew Jacobs (name-node)<br>
+     <b>Append enabled log message uses the wrong variable</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3322">HDFS-3322</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (hdfs client)<br>
+     <b>Update file context to use HdfsDataInputStream and HdfsDataOutputStream</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3319">HDFS-3319</a>.
+     Minor improvement reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (hdfs client)<br>
+     <b>DFSOutputStream should not start a thread in constructors</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3314">HDFS-3314</a>.
+     Major bug reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur <br>
+     <b>HttpFS operation for getHomeDirectory is incorrect</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3309">HDFS-3309</a>.
+     Major bug reported by Romain Rigaux and fixed by Alejandro Abdelnur <br>
+     <b>HttpFS (Hoop) chmod not supporting octal and sticky bit permissions</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3305">HDFS-3305</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (ha , name-node)<br>
+     <b>GetImageServlet should consider SBN a valid requestor in a secure HA setup</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3303">HDFS-3303</a>.
+     Minor bug reported by Brandon Li and fixed by Brandon Li (name-node)<br>
+     <b>RemoteEditLogManifest doesn't need to implements Writable</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3298">HDFS-3298</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (hdfs client)<br>
+     <b>Add HdfsDataOutputStream as a public API</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3294">HDFS-3294</a>.
+     Trivial improvement reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node , name-node)<br>
+     <b>Fix indentation in NamenodeWebHdfsMethods and DatanodeWebHdfsMethods</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3286">HDFS-3286</a>.
+     Major bug reported by J.Andreina and fixed by Ashish Singhi (balancer)<br>
+     <b>When the threshold value for balancer is 0(zero) ,unexpected output is displayed</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3284">HDFS-3284</a>.
+     Minor bug reported by Todd Lipcon and fixed by Todd Lipcon (ha , security)<br>
+     <b>bootstrapStandby fails in secure cluster</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3282">HDFS-3282</a>.
+     Major sub-task reported by Uma Maheswara Rao G and fixed by Uma Maheswara Rao G (hdfs client)<br>
+     <b>Add HdfsDataInputStream as a public API</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3280">HDFS-3280</a>.
+     Critical bug reported by Todd Lipcon and fixed by Todd Lipcon (hdfs client)<br>
+     <b>DFSOutputStream.sync should not be synchronized</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3279">HDFS-3279</a>.
+     Minor improvement reported by Tsz Wo (Nicholas), SZE and fixed by Arpit Gupta (name-node)<br>
+     <b>One of the FSEditLog constructors should be moved to TestEditLog</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3275">HDFS-3275</a>.
+     Major bug reported by Vinithra Varadharajan and fixed by amith (ha , name-node)<br>
+     <b>Format command overwrites contents of non-empty shared edits dir if name dirs are empty without any prompting</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3268">HDFS-3268</a>.
+     Critical bug reported by Daryn Sharp and fixed by Daryn Sharp (ha , hdfs client)<br>
+     <b>Hdfs mishandles token service &amp; incompatible with HA</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3263">HDFS-3263</a>.
+     Major improvement reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur <br>
+     <b>HttpFS should read HDFS config from Hadoop site.xml files</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3260">HDFS-3260</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers <br>
+     <b>TestDatanodeRegistration should set minimum DN version in addition to minimum NN version</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3259">HDFS-3259</a>.
+     Major improvement reported by Aaron T. Myers and fixed by Aaron T. Myers (ha , name-node)<br>
+     <b>NameNode#initializeSharedEdits should populate shared edits dir with edit log segments</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3256">HDFS-3256</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers <br>
+     <b>HDFS considers blocks under-replicated if topology script is configured with only 1 rack</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3255">HDFS-3255</a>.
+     Critical bug reported by Daryn Sharp and fixed by Daryn Sharp (ha , hdfs client)<br>
+     <b>HA DFS returns wrong token service</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3254">HDFS-3254</a>.
+     Major bug reported by Anupam Seth and fixed by Anupam Seth (fuse-dfs)<br>
+     <b>Branch-2 build broken due to wrong version number in fuse-dfs' pom.xml</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3249">HDFS-3249</a>.
+     Trivial improvement reported by Todd Lipcon and fixed by Todd Lipcon (name-node)<br>
+     <b>Use ToolRunner.confirmPrompt in NameNode</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3248">HDFS-3248</a>.
+     Minor bug reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe <br>
+     <b>bootstrapstanby repeated twice in hdfs namenode usage message</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3247">HDFS-3247</a>.
+     Minor improvement reported by Todd Lipcon and fixed by Todd Lipcon (ha)<br>
+     <b>Improve bootstrapStandby behavior when original NN is not active</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3244">HDFS-3244</a>.
+     Major improvement reported by Eli Collins and fixed by Eli Collins <br>
+     <b>Remove dead writable code from hdfs/protocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3240">HDFS-3240</a>.
+     Trivial improvement reported by Todd Lipcon and fixed by Todd Lipcon (data-node)<br>
+     <b>Drop log level of "heartbeat: ..." in BPServiceActor to DEBUG</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3238">HDFS-3238</a>.
+     Major improvement reported by Eli Collins and fixed by Eli Collins <br>
+     <b>ServerCommand and friends don't need to be writables</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3236">HDFS-3236</a>.
+     Minor bug reported by Aaron T. Myers and fixed by Aaron T. Myers (ha , name-node)<br>
+     <b>NameNode does not initialize generic conf keys when started with -initializeSharedEditsDir</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3234">HDFS-3234</a>.
+     Trivial bug reported by Todd Lipcon and fixed by Todd Lipcon (tools)<br>
+     <b>Accidentally left log message in GetConf after HDFS-3226</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3226">HDFS-3226</a>.
+     Major improvement reported by Todd Lipcon and fixed by Todd Lipcon (tools)<br>
+     <b>Allow GetConf tool to print arbitrary keys</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3222">HDFS-3222</a>.
+     Major bug reported by Uma Maheswara Rao G and fixed by Uma Maheswara Rao G (hdfs client)<br>
+     <b>DFSInputStream#openInfo should not silently get the length as 0 when locations length is zero for last partial block.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3214">HDFS-3214</a>.
+     Blocker bug reported by Todd Lipcon and fixed by Todd Lipcon (data-node)<br>
+     <b>InterDatanodeProtocolServerSideTranslatorPB doesn't handle null response from initReplicaRecovery</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3211">HDFS-3211</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (ha , name-node)<br>
+     <b>JournalProtocol changes required for introducing epoch and fencing</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3210">HDFS-3210</a>.
+     Major bug reported by Eli Collins and fixed by Eli Collins <br>
+     <b>JsonUtil#toJsonMap for for a DatanodeInfo should use "ipAddr" instead of "name"</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3208">HDFS-3208</a>.
+     Major bug reported by Eli Collins and fixed by Eli Collins (name-node)<br>
+     <b>Bogus entries in hosts files are incorrectly displayed in the report </b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3204">HDFS-3204</a>.
+     Major improvement reported by Suresh Srinivas and fixed by Suresh Srinivas (name-node)<br>
+     <b>Minor modification to JournalProtocol.proto to make it generic</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3202">HDFS-3202</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (data-node)<br>
+     <b>NamespaceInfo PB translation drops build version</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3199">HDFS-3199</a>.
+     Major bug reported by Eli Collins and fixed by Todd Lipcon <br>
+     <b>TestValidateConfigurationSettings is failing</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3187">HDFS-3187</a>.
+     Minor sub-task reported by Todd Lipcon and fixed by Todd Lipcon (build)<br>
+     <b>Upgrade guava to 11.0.2</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3181">HDFS-3181</a>.
+     Minor bug reported by Colin Patrick McCabe and fixed by Tsz Wo (Nicholas), SZE (test)<br>
+     <b>testHardLeaseRecoveryAfterNameNodeRestart fails when length before restart is 1 byte less than CRC chunk size</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3179">HDFS-3179</a>.
+     Major improvement reported by Zhanwei.Wang and fixed by Tsz Wo (Nicholas), SZE (hdfs client)<br>
+     <b>Improve the error message: DataStreamer throw an exception, "nodes.length != original.length + 1" on single datanode cluster</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3172">HDFS-3172</a>.
+     Trivial improvement reported by Eli Collins and fixed by Eli Collins (name-node)<br>
+     <b>dfs.upgrade.permission is dead code</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3171">HDFS-3171</a>.
+     Major improvement reported by Eli Collins and fixed by Eli Collins (data-node)<br>
+     <b>The DatanodeID "name" field is overloaded </b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3169">HDFS-3169</a>.
+     Minor improvement reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe (test)<br>
+     <b>TestFsck should test multiple -move operations in a row</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3167">HDFS-3167</a>.
+     Minor new feature reported by Henry Robinson and fixed by Henry Robinson (test)<br>
+     <b>CLI-based driver for MiniDFSCluster</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3164">HDFS-3164</a>.
+     Major improvement reported by Eli Collins and fixed by Eli Collins (data-node)<br>
+     <b>Move DatanodeInfo#hostName to DatanodeID</b><br>
+     <blockquote>This change modifies DatanodeID, which is part of the client to server protocol, therefore clients must be upgraded with servers.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3160">HDFS-3160</a>.
+     Major bug reported by Roman Shaposhnik and fixed by Roman Shaposhnik (scripts)<br>
+     <b>httpfs should exec catalina instead of forking it</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3158">HDFS-3158</a>.
+     Major improvement reported by Aaron T. Myers and fixed by Aaron T. Myers (name-node)<br>
+     <b>LiveNodes member of NameNodeMXBean should list non-DFS used space and capacity per DN</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3156">HDFS-3156</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (test)<br>
+     <b>TestDFSHAAdmin is failing post HADOOP-8202</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3155">HDFS-3155</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>Clean up FSDataset implemenation related code.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3148">HDFS-3148</a>.
+     Major new feature reported by Eli Collins and fixed by Eli Collins (hdfs client , performance)<br>
+     <b>The client should be able to use multiple local interfaces for data transfer</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3144">HDFS-3144</a>.
+     Major improvement reported by Eli Collins and fixed by Eli Collins (data-node)<br>
+     <b>Refactor DatanodeID#getName by use</b><br>
+     <blockquote>This change modifies DatanodeID, which is part of the client to server protocol, therefore clients must be upgraded with servers.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3143">HDFS-3143</a>.
+     Major bug reported by Eli Collins and fixed by Arpit Gupta (test)<br>
+     <b>TestGetBlocks.testGetBlocks is failing</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3142">HDFS-3142</a>.
+     Blocker bug reported by Eli Collins and fixed by Brandon Li (test)<br>
+     <b>TestHDFSCLI.testAll is failing</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3139">HDFS-3139</a>.
+     Minor improvement reported by Eli Collins and fixed by Eli Collins (data-node)<br>
+     <b>Minor Datanode logging improvement</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3138">HDFS-3138</a>.
+     Major improvement reported by Eli Collins and fixed by Eli Collins <br>
+     <b>Move DatanodeInfo#ipcPort to DatanodeID</b><br>
+     <blockquote>This change modifies DatanodeID, which is part of the client to server protocol, therefore clients must be upgraded with servers.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3137">HDFS-3137</a>.
+     Major improvement reported by Eli Collins and fixed by Eli Collins (name-node)<br>
+     <b>Bump LAST_UPGRADABLE_LAYOUT_VERSION to -16</b><br>
+     <blockquote>Upgrade from Hadoop versions earlier than 0.18 is not supported as of 2.0. To upgrade from an earlier release, first upgrade to 0.18, and then upgrade again from there.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3132">HDFS-3132</a>.
+     Minor bug reported by Todd Lipcon and fixed by Todd Lipcon (name-node)<br>
+     <b>Findbugs warning on HDFS trunk</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3130">HDFS-3130</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>Move FSDataset implemenation to a package</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3129">HDFS-3129</a>.
+     Minor test reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe <br>
+     <b>NetworkTopology: add test that getLeaf should check for invalid topologies</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3121">HDFS-3121</a>.
+     Major bug reported by John George and fixed by John George <br>
+     <b>hdfs tests for HADOOP-8014</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3120">HDFS-3120</a>.
+     Major improvement reported by Eli Collins and fixed by Eli Collins <br>
+     <b>Enable hsync and hflush by default</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3119">HDFS-3119</a>.
+     Minor bug reported by J.Andreina and fixed by Ashish Singhi (name-node)<br>
+     <b>Overreplicated block is not deleted even after the replication factor is reduced after sync follwed by closing that file</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3111">HDFS-3111</a>.
+     Trivial task reported by Todd Lipcon and fixed by Uma Maheswara Rao G <br>
+     <b>Missing license headers in trunk</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3109">HDFS-3109</a>.
+     Major bug reported by Ravi Prakash and fixed by Ravi Prakash <br>
+     <b>Remove hsqldb exclusions from pom.xml</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3105">HDFS-3105</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node , hdfs client)<br>
+     <b>Add DatanodeStorage information to block recovery</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3102">HDFS-3102</a>.
+     Major new feature reported by Todd Lipcon and fixed by Aaron T. Myers (ha , name-node)<br>
+     <b>Add CLI tool to initialize the shared-edits dir</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3101">HDFS-3101</a>.
+     Major bug reported by Zhanwei.Wang and fixed by Tsz Wo (Nicholas), SZE (webhdfs)<br>
+     <b>cannot read empty file using webhdfs</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3100">HDFS-3100</a>.
+     Major bug reported by Zhanwei.Wang and fixed by Brandon Li (data-node)<br>
+     <b>failed to append data</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3099">HDFS-3099</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (name-node)<br>
+     <b>SecondaryNameNode does not properly initialize metrics system</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3094">HDFS-3094</a>.
+     Major improvement reported by Arpit Gupta and fixed by Arpit Gupta <br>
+     <b>add -nonInteractive and -force option to namenode -format command</b><br>
+     <blockquote>The 'namenode -format' command now supports the flags '-nonInteractive' and '-force' to improve usefulness without user input.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3093">HDFS-3093</a>.
+     Critical bug reported by Todd Lipcon and fixed by Todd Lipcon <br>
+     <b>TestAllowFormat is trying to be interactive</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3091">HDFS-3091</a>.
+     Major improvement reported by Uma Maheswara Rao G and fixed by Tsz Wo (Nicholas), SZE (data-node , hdfs client , name-node)<br>
+     <b>Update the usage limitations of ReplaceDatanodeOnFailure policy in the config description for the smaller clusters.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3089">HDFS-3089</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>Move FSDatasetInterface and other related classes/interfaces to a package</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3088">HDFS-3088</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>Move FSDatasetInterface inner classes to a package</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3086">HDFS-3086</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>Change Datanode not to send storage list in registration - it will be sent in block report</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3084">HDFS-3084</a>.
+     Major improvement reported by Philip Zeyliger and fixed by Todd Lipcon (ha)<br>
+     <b>FenceMethod.tryFence() and ShellCommandFencer should pass namenodeId as well as host:port</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3083">HDFS-3083</a>.
+     Critical bug reported by Mingjie Lai and fixed by Aaron T. Myers (ha , security)<br>
+     <b>Cannot run an MR job with HA and security enabled when second-listed NN active</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3082">HDFS-3082</a>.
+     Major sub-task reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>Clean up FSDatasetInterface</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3071">HDFS-3071</a>.
+     Major improvement reported by Philip Zeyliger and fixed by Todd Lipcon (ha)<br>
+     <b>haadmin failover command does not provide enough detail for when target NN is not ready to be active</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3070">HDFS-3070</a>.
+     Major bug reported by Stephen Chu and fixed by Aaron T. Myers (balancer)<br>
+     <b>HDFS balancer doesn't ensure that hdfs-site.xml is loaded</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3066">HDFS-3066</a>.
+     Major improvement reported by Patrick Hunt and fixed by Patrick Hunt (scripts)<br>
+     <b>cap space usage of default log4j rolling policy (hdfs specific changes)</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3062">HDFS-3062</a>.
+     Critical bug reported by Mingjie Lai and fixed by Mingjie Lai (ha , security)<br>
+     <b>Fail to submit mapred job on a secured-HA-HDFS: logic URI cannot be picked up by job submission.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3057">HDFS-3057</a>.
+     Major bug reported by Roman Shaposhnik and fixed by Roman Shaposhnik (scripts)<br>
+     <b>httpfs and hdfs launcher scripts should honor CATALINA_HOME and HADOOP_LIBEXEC_DIR</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3056">HDFS-3056</a>.
+     Major improvement reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>Add an interface for DataBlockScanner logging</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3050">HDFS-3050</a>.
+     Minor improvement reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe (name-node)<br>
+     <b>rework OEV to share more code with the NameNode</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3044">HDFS-3044</a>.
+     Major improvement reported by Eli Collins and fixed by Colin Patrick McCabe (name-node)<br>
+     <b>fsck move should be non-destructive by default</b><br>
+     <blockquote>The fsck "move" option is no longer destructive. It copies the accessible blocks of corrupt files to lost and found as before, but no longer deletes the corrupt files after copying the blocks. The original, destructive behavior can be enabled by specifying both the "move" and "delete" options. </blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3038">HDFS-3038</a>.
+     Trivial bug reported by Todd Lipcon and fixed by Todd Lipcon <br>
+     <b>Add FSEditLog.metrics to findbugs exclude list</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3036">HDFS-3036</a>.
+     Trivial improvement reported by Aaron T. Myers and fixed by Aaron T. Myers (name-node)<br>
+     <b>Remove unused method DFSUtil#isDefaultNamenodeAddress</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3032">HDFS-3032</a>.
+     Major bug reported by Kihwal Lee and fixed by Kihwal Lee (hdfs client)<br>
+     <b>Lease renewer tries forever even if renewal is not possible</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3030">HDFS-3030</a>.
+     Major improvement reported by Jitendra Nath Pandey and fixed by Jitendra Nath Pandey <br>
+     <b>Remove getProtocolVersion and getProtocolSignature from translators</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3026">HDFS-3026</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (ha , name-node)<br>
+     <b>HA: Handle failure during HA state transition</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3024">HDFS-3024</a>.
+     Minor improvement reported by Todd Lipcon and fixed by Todd Lipcon (name-node)<br>
+     <b>Improve performance of stringification in addStoredBlock</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3021">HDFS-3021</a>.
+     Major improvement reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>Use generic type to declare FSDatasetInterface</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3020">HDFS-3020</a>.
+     Critical bug reported by Todd Lipcon and fixed by Todd Lipcon (name-node)<br>
+     <b>Auto-logSync based on edit log buffer size broken</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3014">HDFS-3014</a>.
+     Major improvement reported by Sho Shimauchi and fixed by Sho Shimauchi (name-node)<br>
+     <b>FSEditLogOp and its subclasses should have toString() method</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3005">HDFS-3005</a>.
+     Major bug reported by Tsz Wo (Nicholas), SZE and fixed by Tsz Wo (Nicholas), SZE (data-node)<br>
+     <b>ConcurrentModificationException in FSDataset$FSVolume.getDfsUsed(..)</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3004">HDFS-3004</a>.
+     Major new feature reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe (tools)<br>
+     <b>Implement Recovery Mode</b><br>
+     <blockquote>This is a new feature.  It is documented in hdfs_user_guide.xml.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3003">HDFS-3003</a>.
+     Trivial improvement reported by Brandon Li and fixed by Brandon Li (name-node)<br>
+     <b>Remove getHostPortString() from NameNode, replace it with NetUtils.getHostPortString()</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-3000">HDFS-3000</a>.
+     Major new feature reported by Aaron T. Myers and fixed by Aaron T. Myers (hdfs client)<br>
+     <b>Add a public API for setting quotas</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2995">HDFS-2995</a>.
+     Major bug reported by Todd Lipcon and fixed by Eli Collins (scripts)<br>
+     <b>start-dfs.sh should only start the 2NN for namenodes with dfs.namenode.secondary.http-address configured</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2983">HDFS-2983</a>.
+     Major improvement reported by Eli Collins and fixed by Aaron T. Myers <br>
+     <b>Relax the build version check to permit rolling upgrades within a release</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2968">HDFS-2968</a>.
+     Blocker bug reported by Todd Lipcon and fixed by Todd Lipcon (data-node , name-node)<br>
+     <b>Protocol translator for BlockRecoveryCommand broken when multiple blocks need recovery</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2941">HDFS-2941</a>.
+     Major new feature reported by Aaron T. Myers and fixed by Aaron T. Myers (hdfs client , name-node)<br>
+     <b>Add an administrative command to download a copy of the fsimage from the NN</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2899">HDFS-2899</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Service protocol change to support multiple storages added in HDFS-2880</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2895">HDFS-2895</a>.
+     Major improvement reported by Suresh Srinivas and fixed by Suresh Srinivas (data-node , name-node)<br>
+     <b>Remove Writable wire protocol related code that is no longer necessary</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2880">HDFS-2880</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (data-node , name-node)<br>
+     <b>Protocol buffer changes to add support multiple storages</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2878">HDFS-2878</a>.
+     Blocker bug reported by Eli Collins and fixed by Todd Lipcon (test)<br>
+     <b>TestBlockRecovery does not compile</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2815">HDFS-2815</a>.
+     Critical bug reported by Uma Maheswara Rao G and fixed by Uma Maheswara Rao G (name-node)<br>
+     <b>Namenode is not coming out of safemode when we perform ( NN crash + restart ) .  Also FSCK report shows blocks missed.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2801">HDFS-2801</a>.
+     Major sub-task reported by Jitendra Nath Pandey and fixed by Jitendra Nath Pandey <br>
+     <b>Provide a method in client side translators to check for a methods supported in underlying protocol.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2799">HDFS-2799</a>.
+     Major bug reported by Eli Collins and fixed by amith (name-node)<br>
+     <b>Trim fs.checkpoint.dir values</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2768">HDFS-2768</a>.
+     Major bug reported by Uma Maheswara Rao G and fixed by Uma Maheswara Rao G (name-node)<br>
+     <b>BackupNode stop can not close proxy connections because it is not a proxy instance.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2765">HDFS-2765</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (test)<br>
+     <b>TestNameEditsConfigs is incorrectly swallowing IOE</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2739">HDFS-2739</a>.
+     Critical bug reported by Sho Shimauchi and fixed by Jitendra Nath Pandey <br>
+     <b>SecondaryNameNode doesn't start up</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2731">HDFS-2731</a>.
+     Major new feature reported by Aaron T. Myers and fixed by Todd Lipcon (ha)<br>
+     <b>HA: Autopopulate standby name dirs if they're empty</b><br>
+     <blockquote>The HA NameNode may now be started with the "-bootstrapStandby" flag. This causes it to copy the namespace information and most recent checkpoint from its HA pair, and save it to local storage, allowing an HA setup to be bootstrapped without use of rsync or external tools.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2708">HDFS-2708</a>.
+     Minor improvement reported by Eli Collins and fixed by Aaron T. Myers (data-node , name-node)<br>
+     <b>Stats for the # of blocks per DN</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2700">HDFS-2700</a>.
+     Major bug reported by Uma Maheswara Rao G and fixed by Uma Maheswara Rao G <br>
+     <b>TestDataNodeMultipleRegistrations is failing in trunk</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2697">HDFS-2697</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Jitendra Nath Pandey <br>
+     <b>Move RefreshAuthPolicy, RefreshUserMappings, GetUserMappings protocol to protocol buffers</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2696">HDFS-2696</a>.
+     Major bug reported by Petru Dimulescu and fixed by Bruno Mah&#233; (build , fuse-dfs)<br>
+     <b>Fix the fuse-fds build</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2694">HDFS-2694</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (name-node)<br>
+     <b>Removal of Avro broke non-PB NN services</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2687">HDFS-2687</a>.
+     Major sub-task reported by Uma Maheswara Rao G and fixed by Suresh Srinivas (test)<br>
+     <b>Tests are failing with ClassCastException, due to new protocol changes </b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2676">HDFS-2676</a>.
+     Major bug reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Remove Avro RPC</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2669">HDFS-2669</a>.
+     Major sub-task reported by Sanjay Radia and fixed by Sanjay Radia <br>
+     <b>Enable protobuf rpc for ClientNamenodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2666">HDFS-2666</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (test)<br>
+     <b>TestBackupNode fails</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2663">HDFS-2663</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Optional parameters are not handled correctly</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2661">HDFS-2661</a>.
+     Major sub-task reported by Jitendra Nath Pandey and fixed by Jitendra Nath Pandey <br>
+     <b>Enable protobuf RPC for DatanodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2651">HDFS-2651</a>.
+     Major sub-task reported by Sanjay Radia and fixed by Sanjay Radia <br>
+     <b>ClientNameNodeProtocol Translators for Protocol Buffers</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2650">HDFS-2650</a>.
+     Minor improvement reported by Hari Mankude and fixed by Hari Mankude <br>
+     <b>Replace @inheritDoc with @Override </b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2647">HDFS-2647</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (balancer , data-node , hdfs client , name-node)<br>
+     <b>Enable protobuf RPC for InterDatanodeProtocol, ClientDatanodeProtocol, JournalProtocol and NamenodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2642">HDFS-2642</a>.
+     Major sub-task reported by Jitendra Nath Pandey and fixed by Jitendra Nath Pandey <br>
+     <b>Protobuf translators for DatanodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2636">HDFS-2636</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Implement protobuf service for ClientDatanodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2629">HDFS-2629</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (data-node)<br>
+     <b>Implement protobuf service for InterDatanodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2618">HDFS-2618</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (name-node)<br>
+     <b>Implement protobuf service for NamenodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2597">HDFS-2597</a>.
+     Major sub-task reported by Sanjay Radia and fixed by Sanjay Radia <br>
+     <b> ClientNameNodeProtocol in Protocol Buffers</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2581">HDFS-2581</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (name-node)<br>
+     <b>Implement protobuf service for JournalProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2532">HDFS-2532</a>.
+     Critical bug reported by Todd Lipcon and fixed by Uma Maheswara Rao G (test)<br>
+     <b>TestDfsOverAvroRpc timing out in trunk</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2526">HDFS-2526</a>.
+     Major bug reported by Aaron T. Myers and fixed by Aaron T. Myers (hdfs client , name-node)<br>
+     <b>(Client)NamenodeProtocolTranslatorR23 do not need to keep a reference to rpcProxyWithoutRetry</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2520">HDFS-2520</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (data-node)<br>
+     <b>Protobuf - Add protobuf service for InterDatanodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2519">HDFS-2519</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (data-node , name-node)<br>
+     <b>Protobuf - Add protobuf service for DatanodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2518">HDFS-2518</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (name-node)<br>
+     <b>Protobuf - Add protobuf service for NamenodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2517">HDFS-2517</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (name-node)<br>
+     <b>Protobuf - Add protocol service for JournalProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2507">HDFS-2507</a>.
+     Major improvement reported by Todd Lipcon and fixed by Todd Lipcon (name-node)<br>
+     <b>HA: Allow saveNamespace operations to be canceled</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2505">HDFS-2505</a>.
+     Minor test reported by Ravi Prakash and fixed by Ravi Prakash (test)<br>
+     <b>Add a test to verify getFileChecksum works with ViewFS</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2499">HDFS-2499</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (name-node)<br>
+     <b>Fix RPC client creation bug from HDFS-2459</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2497">HDFS-2497</a>.
+     Major bug reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Fix TestBackupNode failure</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2496">HDFS-2496</a>.
+     Major improvement reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Separate datatypes for DatanodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2495">HDFS-2495</a>.
+     Major sub-task reported by Tomasz Nykiel and fixed by Tomasz Nykiel (name-node)<br>
+     <b>Increase granularity of write operations in ReplicationMonitor thus reducing contention for write lock</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2489">HDFS-2489</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Move commands Finalize and Register out of DatanodeCommand class.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2488">HDFS-2488</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas (data-node)<br>
+     <b>Separate datatypes for InterDatanodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2481">HDFS-2481</a>.
+     Major bug reported by Tsz Wo (Nicholas), SZE and fixed by Sanjay Radia <br>
+     <b>Unknown protocol: org.apache.hadoop.hdfs.protocol.ClientProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2480">HDFS-2480</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Separate datatypes for NamenodeProtocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2479">HDFS-2479</a>.
+     Major sub-task reported by Sanjay Radia and fixed by Sanjay Radia <br>
+     <b>HDFS Client Data Types in Protocol Buffers</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2477">HDFS-2477</a>.
+     Major sub-task reported by Tomasz Nykiel and fixed by Tomasz Nykiel (name-node)<br>
+     <b>Optimize computing the diff between a block report and the namenode state.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2476">HDFS-2476</a>.
+     Major sub-task reported by Tomasz Nykiel and fixed by Tomasz Nykiel (name-node)<br>
+     <b>More CPU efficient data structure for under-replicated/over-replicated/invalidate blocks</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2459">HDFS-2459</a>.
+     Major sub-task reported by Suresh Srinivas and fixed by Suresh Srinivas <br>
+     <b>Separate datatypes for Journal protocol</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2430">HDFS-2430</a>.
+     Major new feature reported by Aaron T. Myers and fixed by Aaron T. Myers (name-node)<br>
+     <b>The number of failed or low-resource volumes the NN can tolerate should be configurable</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2413">HDFS-2413</a>.
+     Major improvement reported by Todd Lipcon and fixed by Harsh J (hdfs client)<br>
+     <b>Add public APIs for safemode</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2410">HDFS-2410</a>.
+     Minor improvement reported by Suresh Srinivas and fixed by Suresh Srinivas (data-node , name-node , test)<br>
+     <b>Further clean up hard-coded configuration keys</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2351">HDFS-2351</a>.
+     Major improvement reported by Sanjay Radia and fixed by Sanjay Radia <br>
+     <b>Change Namenode and Datanode to register each of their protocols seperately </b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2337">HDFS-2337</a>.
+     Major improvement reported by Aaron T. Myers and fixed by Aaron T. Myers (hdfs client)<br>
+     <b>DFSClient shouldn't keep multiple RPC proxy references</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2334">HDFS-2334</a>.
+     Major sub-task reported by Ivan Kelly and fixed by Ivan Kelly (name-node)<br>
+     <b>Add Closeable to JournalManager</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2303">HDFS-2303</a>.
+     Major improvement reported by Roman Shaposhnik and fixed by Mingjie Lai (build , scripts)<br>
+     <b>Unbundle jsvc</b><br>
+     <blockquote>To run secure Datanodes users must install jsvc for their platform and set JSVC_HOME to point to the location of jsvc in their environment.</blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2223">HDFS-2223</a>.
+     Major improvement reported by Todd Lipcon and fixed by Todd Lipcon (name-node)<br>
+     <b>Untangle depencencies between NN components</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2181">HDFS-2181</a>.
+     Major sub-task reported by Sanjay Radia and fixed by Sanjay Radia <br>
+     <b>Separate HDFS Client wire protocol data types</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2158">HDFS-2158</a>.
+     Major sub-task reported by Jitendra Nath Pandey and fixed by Jitendra Nath Pandey <br>
+     <b>Add JournalSet to manage the set of journals.</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2038">HDFS-2038</a>.
+     Critical test reported by Daryn Sharp and fixed by Kihwal Lee (test)<br>
+     <b>Update test to handle relative paths with globs</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-2018">HDFS-2018</a>.
+     Major sub-task reported by Ivan Kelly and fixed by Ivan Kelly <br>
+     <b>1073: Move all journal stream management code into one place</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-1765">HDFS-1765</a>.
+     Major bug reported by Hairong Kuang and fixed by Uma Maheswara Rao G (name-node)<br>
+     <b>Block Replication should respect under-replication block priority</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-1623">HDFS-1623</a>.
+     Major new feature reported by Sanjay Radia and fixed by  <br>
+     <b>High Availability Framework for HDFS NN</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-1580">HDFS-1580</a>.
+     Major improvement reported by Ivan Kelly and fixed by Jitendra Nath Pandey (name-node)<br>
+     <b>Add interface for generic Write Ahead Logging mechanisms</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-891">HDFS-891</a>.
+     Minor bug reported by Steve Loughran and fixed by Harsh J (data-node)<br>
+     <b>DataNode no longer needs to check for dfs.network.script</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-860">HDFS-860</a>.
+     Minor wish reported by Brian Bockelman and fixed by Brian Bockelman (fuse-dfs)<br>
+     <b>fuse-dfs truncate behavior causes issues with scp</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-395">HDFS-395</a>.
+     Major sub-task reported by dhruba borthakur and fixed by Tomasz Nykiel (data-node , name-node)<br>
+     <b>DFS Scalability: Incremental block reports</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-309">HDFS-309</a>.
+     Major improvement reported by Todd Lipcon and fixed by Sho Shimauchi <br>
+     <b>FSEditLog should log progress during replay</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-234">HDFS-234</a>.
+     Major new feature reported by Luca Telloli and fixed by Ivan Kelly <br>
+     <b>Integration with BookKeeper logging system</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HDFS-208">HDFS-208</a>.
+     Minor improvement reported by Allen Wittenauer and fixed by Uma Maheswara Rao G (name-node)<br>
+     <b>name node should warn if only one dir is listed in dfs.name.dir</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8619">HADOOP-8619</a>.
+     Major improvement reported by Radim Kolar and fixed by Chris Douglas (io)<br>
+     <b>WritableComparator must implement no-arg constructor</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8398">HADOOP-8398</a>.
+     Minor improvement reported by Eli Collins and fixed by Eli Collins <br>
+     <b>Cleanup BlockLocation</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8388">HADOOP-8388</a>.
+     Minor improvement reported by Colin Patrick McCabe and fixed by Colin Patrick McCabe <br>
+     <b>Remove unused BlockLocation serialization</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8366">HADOOP-8366</a>.
+     Blocker improvement reported by Sanjay Radia and fixed by Sanjay Radia <br>
+     <b>Use ProtoBuf for RpcResponseHeader</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8359">HADOOP-8359</a>.
+     Trivial task reported by Harsh J and fixed by Anupam Seth (conf)<br>
+     <b>Clear up javadoc warnings in hadoop-common-project</b><br>
+     <blockquote></blockquote></li>
+<li> <a href="https://issues.apache.org/jira/browse/HADOOP-8356">HADOOP-8356</a>.
+     Major improvement reported by Alejandro Abdelnur and fixed by Alejandro Abdelnur (fs)<br>
+     <b>FileSystem service loading mechanism should print the FileSystem impl it is failing to load</b><br>
+     <blockquote></blockquote></li>

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