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From ni...@apache.org
Subject svn commit: r637304 [2/3] - in /hadoop/core/trunk: ./ docs/ src/docs/ src/docs/changes/ src/docs/src/documentation/conf/ src/docs/src/documentation/content/xdocs/
Date Fri, 14 Mar 2008 23:34:55 GMT
Added: hadoop/core/trunk/docs/changes.html
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/docs/changes.html?rev=637304&view=auto
--- hadoop/core/trunk/docs/changes.html (added)
+++ hadoop/core/trunk/docs/changes.html Fri Mar 14 16:34:52 2008
@@ -0,0 +1,3169 @@
+** WARNING: This file is generated from CHANGES.txt by the 
+**          Perl script 'changes2html.pl'.
+**          Do *not* edit this file!
+* Licensed to the Apache Software Foundation (ASF) under one or more
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+  <title>Hadoop Change Log</title>
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+<a href="http://hadoop.apache.org/core/"><img class="logoImage" alt="Hadoop" src="images/hadoop-logo.jpg" title="Scalable Computing Platform"></a>
+<h1>Hadoop Change Log</h1>
+<h2><a href="javascript:toggleList('trunk_(unreleased_changes)_')">Trunk (unreleased changes)
+<ul id="trunk_(unreleased_changes)_">
+  <li><a href="javascript:toggleList('trunk_(unreleased_changes)_._incompatible_changes_')">  INCOMPATIBLE CHANGES
+    <ol id="trunk_(unreleased_changes)_._incompatible_changes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2786">HADOOP-2786</a>.  Move hbase out of hadoop core
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2345">HADOOP-2345</a>.  New HDFS transactions to support appending
+to files.  Disk layout version changed from -11 to -12.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2192">HADOOP-2192</a>. Error messages from "dfs mv" command improved.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1902">HADOOP-1902</a>. "dfs du" command without any arguments operates on the
+current working directory.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2873">HADOOP-2873</a>.  Fixed bad disk format introduced by <a href="http://issues.apache.org/jira/browse/HADOOP-2345">HADOOP-2345</a>.
+Disk layout version changed from -12 to -13. See changelist 630992<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1985">HADOOP-1985</a>.  This addresses rack-awareness for Map tasks and for
+HDFS in a uniform way.<br />(ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1986">HADOOP-1986</a>.  Add support for a general serialization mechanism for
+Map Reduce.<br />(tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-771">HADOOP-771</a>. FileSystem.delete() takes an explicit parameter that
+specifies whether a recursive delete is intended.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2470">HADOOP-2470</a>. Remove getContentLength(String), open(String, long, long)
+and isDir(String) from ClientProtocol. ClientProtocol version changed
+from 26 to 27. (Tsz Wo (Nicholas), SZE via cdouglas)
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('trunk_(unreleased_changes)_._new_features_')">  NEW FEATURES
+    <ol id="trunk_(unreleased_changes)_._new_features_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1398">HADOOP-1398</a>.  Add HBase in-memory block cache.<br />(tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2178">HADOOP-2178</a>.  Job History on DFS.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2063">HADOOP-2063</a>. A new parameter to dfs -get command to fetch a file
+even if it is corrupted.  (Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2219">HADOOP-2219</a>. A new command "df -count" that counts the number of
+files and directories.  (Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2906">HADOOP-2906</a>. Add an OutputFormat capable of using keys, values, and
+config params to map records to different output files.<br />(Runping Qi via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2346">HADOOP-2346</a>. Utilities to support timeout while writing to sockets.
+DFSClient and DataNode sockets have 10min write timeout.<br />(rangadi)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('trunk_(unreleased_changes)_._improvements_')">  IMPROVEMENTS
+    <ol id="trunk_(unreleased_changes)_._improvements_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2655">HADOOP-2655</a>. Copy on write for data and metadata files in the
+presence of snapshots. Needed for supporting appends to HDFS
+files.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1967">HADOOP-1967</a>.  When a Path specifies the same scheme as the default
+FileSystem but no authority, the default FileSystem's authority is
+used.  Also add warnings for old-format FileSystem names, accessor
+methods for fs.default.name, and check for null authority in HDFS.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2895">HADOOP-2895</a>. Let the profiling string be configurable.<br />(Martin Traverso via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-910">HADOOP-910</a>. Enables Reduces to do merges for the on-disk map output files
+in parallel with their copying.<br />(Amar Kamat via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2833">HADOOP-2833</a>. Do not use "Dr. Who" as the default user in JobClient.
+A valid user name is required. (Tsz Wo (Nicholas), SZE via rangadi)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-730">HADOOP-730</a>. Use rename rather than copy for local renames.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2810">HADOOP-2810</a>. Updated the Hadoop Core logo.<br />(nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2057">HADOOP-2057</a>.  Streaming should optionally treat a non-zero exit status
+of a child process as a failed task.<br />(Rick Cox via tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2765">HADOOP-2765</a>. Enables specifying ulimits for streaming/pipes tasks<br />(ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2888">HADOOP-2888</a>. Make gridmix scripts more readily configurable and amenable
+to automated execution.<br />(Mukund Madhugiri via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2908">HADOOP-2908</a>.  A document that describes the DFS Shell command.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2981">HADOOP-2981</a>.  Update README.txt to reflect the upcoming use of
+cryptography.<br />(omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2775">HADOOP-2775</a>.  Adds unit test framework for HOD.
+(Vinod Kumar Vavilapalli via ddas).
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('trunk_(unreleased_changes)_._optimizations_')">  OPTIMIZATIONS
+    <ol id="trunk_(unreleased_changes)_._optimizations_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2790">HADOOP-2790</a>.  Fixed inefficient method hasSpeculativeTask by removing
+repetitive calls to get the current time and late checking to see if
+we want speculation on at all.<br />(omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2758">HADOOP-2758</a>. Reduce buffer copies in DataNode when data is read from
+HDFS, without negatively affecting read throughput.<br />(rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2399">HADOOP-2399</a>. Input key and value to combiner and reducer is reused.
+(Owen O'Malley via ddas).
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2423">HADOOP-2423</a>.  Code optimization in FSNamesystem.mkdirs.
+(Tsz Wo (Nicholas), SZE via dhruba)
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('trunk_(unreleased_changes)_._bug_fixes_')">  BUG FIXES
+    <ol id="trunk_(unreleased_changes)_._bug_fixes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2195">HADOOP-2195</a>. '-mkdir' behaviour is now closer to Linux shell in case of
+errors.<br />(Mahadev Konar via rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2190">HADOOP-2190</a>. bring behaviour '-ls' and '-du' closer to Linux shell
+commands in case of errors.<br />(Mahadev Konar via rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2193">HADOOP-2193</a>. 'fs -rm' and 'fs -rmr' show error message when the target
+file does not exist.<br />(Mahadev Konar via rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2738">HADOOP-2738</a> Text is not subclassable because set(Text) and compareTo(Object)
+access the other instance's private members directly.<br />(jimk)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2779">HADOOP-2779</a>.  Remove the references to HBase in the build.xml.<br />(omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2194">HADOOP-2194</a>. dfs cat on a non-existent file throws FileNotFoundException.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2767">HADOOP-2767</a>. Fix for NetworkTopology erroneously skipping the last leaf
+node on a rack.<br />(Hairong Kuang and Mark Butler via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1593">HADOOP-1593</a>. FsShell works with paths in non-default FileSystem.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2191">HADOOP-2191</a>. du and dus command on non-existent directory gives
+appropriate error message.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2832">HADOOP-2832</a>. Remove tabs from code of DFSClient for better
+indentation.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2844">HADOOP-2844</a>. distcp closes file handles for sequence files.
+(Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2727">HADOOP-2727</a>. Fix links in Web UI of the hadoop daemons and some docs<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2871">HADOOP-2871</a>. Fixes a problem to do with file: URI in the JobHistory init.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2800">HADOOP-2800</a>.  Deprecate SetFile.Writer constructor not the whole class.<br />(Johan Oskarsson via tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2891">HADOOP-2891</a>.  DFSClient.close() closes all open files.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2845">HADOOP-2845</a>.  Fix dfsadmin disk utilization report on Solaris.<br />(Martin Traverso via tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2912">HADOOP-2912</a>. MiniDFSCluster restart should wait for namenode to exit
+safemode. This was causing TestFsck to fail.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2820">HADOOP-2820</a>. The following classes in streaming are removed :
+StreamLineRecordReader StreamOutputFormat StreamSequenceRecordReader.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2819">HADOOP-2819</a>. The following methods in JobConf are removed:
+getInputKeyClass() setInputKeyClass getInputValueClass()
+setInputValueClass(Class theClass) setSpeculativeExecution
+getSpeculativeExecution()<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2817">HADOOP-2817</a>. Removes deprecated mapred.tasktracker.tasks.maximum and
+ClusterStatus.getMaxTasks().<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2821">HADOOP-2821</a>. Removes deprecated ShellUtil and ToolBase classes from
+the util package.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2934">HADOOP-2934</a>. The namenode was encountreing a NPE while loading
+leases from the fsimage. Fixed.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2938">HADOOP-2938</a>. Some fs commands did not glob paths.
+(Tsz Wo (Nicholas), SZE via rangadi)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2943">HADOOP-2943</a>. Compression of intermediate map output causes failures
+in the merge.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2870">HADOOP-2870</a>.  DataNode and NameNode closes all connections while
+shutting down.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2973">HADOOP-2973</a>. Fix TestLocalDFS for Windows platform.
+(Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2971">HADOOP-2971</a>. select multiple times if it returns early in
+SocketIOWithTimeout.<br />(rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2955">HADOOP-2955</a>. Fix TestCrcCorruption test failures caused by <a href="http://issues.apache.org/jira/browse/HADOOP-2758">HADOOP-2758</a><br />(rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2657">HADOOP-2657</a>. A flush call on the DFSOutputStream flushes the last
+partial CRC chunk too.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2974">HADOOP-2974</a>. IPC unit tests used "" to connect to server, which
+is not always supported.<br />(rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2996">HADOOP-2996</a>. Fixes uses of StringBuffer in StreamUtils class.<br />(Dave Brosius via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2995">HADOOP-2995</a>. Fixes StreamBaseRecordReader's getProgress to return a
+floating point number.<br />(Dave Brosius via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2972">HADOOP-2972</a>. Fix for a NPE in FSDataset.invalidate.<br />(Mahadev Konar via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2994">HADOOP-2994</a>. Code cleanup for DFSClient: remove redundant
+conversions from string to string.<br />(Dave Brosius via dhruba)</li>
+    </ol>
+  </li>
+<h2><a href="javascript:toggleList('release_0.16.1_-_2008-03-13_')">Release 0.16.1 - 2008-03-13
+<ul id="release_0.16.1_-_2008-03-13_">
+  <li><a href="javascript:toggleList('release_0.16.1_-_2008-03-13_._incompatible_changes_')">  INCOMPATIBLE CHANGES
+    <ol id="release_0.16.1_-_2008-03-13_._incompatible_changes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2861">HADOOP-2861</a>. Improve the user interface for the HOD commands.
+Command line structure has changed.<br />(Hemanth Yamijala via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2869">HADOOP-2869</a>. Deprecate SequenceFile.setCompressionType in favor of
+SequenceFile.createWriter, SequenceFileOutputFormat.setCompressionType,
+and JobConf.setMapOutputCompressionType. (Arun C Murthy via cdouglas)
+Configuration changes to hadoop-default.xml:
+  deprecated io.seqfile.compression.type
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.16.1_-_2008-03-13_._improvements_')">  IMPROVEMENTS
+    <ol id="release_0.16.1_-_2008-03-13_._improvements_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2371">HADOOP-2371</a>. User guide for file permissions in HDFS.<br />(Robert Chansler via rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2730">HADOOP-2730</a>. HOD documentation update.<br />(Vinod Kumar Vavilapalli via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2911">HADOOP-2911</a>. Make the information printed by the HOD allocate and
+info commands less verbose and clearer.<br />(Vinod Kumar via nigel)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.16.1_-_2008-03-13_._bug_fixes_')">  BUG FIXES
+    <ol id="release_0.16.1_-_2008-03-13_._bug_fixes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2789">HADOOP-2789</a>. Race condition in IPC Server Responder that could close
+connections early.<br />(Raghu Angadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2785">HADOOP-2785</a>. minor. Fix a typo in Datanode block verification<br />(Raghu Angadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2788">HADOOP-2788</a>. minor. Fix help message for chgrp shell command (Raghu Angadi).
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1188">HADOOP-1188</a>. fstime file is updated when a storage directory containing
+namespace image becomes inaccessible.<br />(shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2787">HADOOP-2787</a>. An application can set a configuration variable named
+dfs.umask to set the umask that is used by DFS.
+(Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2780">HADOOP-2780</a>. The default socket buffer size for DataNodes is 128K.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2716">HADOOP-2716</a>. Superuser privileges for the Balancer.
+(Tsz Wo (Nicholas), SZE via shv)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2754">HADOOP-2754</a>. Filter out .crc files from local file system listing.<br />(Hairong Kuang via shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2733">HADOOP-2733</a>. Fix compiler warnings in test code.
+(Tsz Wo (Nicholas), SZE via cdouglas)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2725">HADOOP-2725</a>. Modify distcp to avoid leaving partially copied files at
+the destination after encountering an error. (Tsz Wo (Nicholas), SZE
+via cdouglas)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2391">HADOOP-2391</a>. Cleanup job output directory before declaring a job as
+SUCCESSFUL.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2808">HADOOP-2808</a>. Minor fix to FileUtil::copy to mind the overwrite
+formal.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2683">HADOOP-2683</a>. Moving UGI out of the RPC Server.
+(Tsz Wo (Nicholas), SZE via shv)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2814">HADOOP-2814</a>. Fix for NPE in datanode in unit test TestDataTransferProtocol.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2811">HADOOP-2811</a>. Dump of counters in job history does not add comma between
+groups.<br />(runping via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2735">HADOOP-2735</a>. Enables setting TMPDIR for tasks.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2843">HADOOP-2843</a>. Fix protections on map-side join classes to enable derivation.<br />(cdouglas via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2840">HADOOP-2840</a>. Fix gridmix scripts to correctly invoke the java sort through
+the proper jar.<br />(Mukund Madhugiri via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2766">HADOOP-2766</a>. Enables setting of HADOOP_OPTS env variable for the hadoop
+daemons through HOD.<br />(Vinod Kumar Vavilapalli via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2769">HADOOP-2769</a>.  TestNNThroughputBnechmark should not use a fixed port for
+the namenode http port.<br />(omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2852">HADOOP-2852</a>. Update gridmix benchmark to avoid an artifically long tail.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2894">HADOOP-2894</a>. Fix a problem to do with tasktrackers failing to connect to
+JobTracker upon reinitialization. (Owen O'Malley via ddas).
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2903">HADOOP-2903</a>.  Fix exception generated by Metrics while using pushMetric().<br />(girish vaitheeswaran via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2904">HADOOP-2904</a>.  Fix to RPC metrics to log the correct host name.<br />(girish vaitheeswaran via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2918">HADOOP-2918</a>.  Improve error logging so that dfs writes failure with
+"No lease on file" can be diagnosed.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2923">HADOOP-2923</a>.  Add SequenceFileAsBinaryInputFormat, which was
+missed in the commit for <a href="http://issues.apache.org/jira/browse/HADOOP-2603">HADOOP-2603</a>.<br />(cdouglas via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2847">HADOOP-2847</a>.  Ensure idle cluster cleanup works even if the JobTracker
+becomes unresponsive to RPC calls.<br />(Hemanth Yamijala via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2809">HADOOP-2809</a>.  Fix HOD syslog config syslog-address so that it works.<br />(Hemanth Yamijala via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2931">HADOOP-2931</a>. IOException thrown by DFSOutputStream had wrong stack
+trace in some cases.<br />(Michael Bieniosek via rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2883">HADOOP-2883</a>. Write failures and data corruptions on HDFS files.
+The write timeout is back to what it was on 0.15 release. Also, the
+datnodes flushes the block file buffered output stream before
+sending a positive ack for the packet back to the client.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2925">HADOOP-2925</a>. Fix HOD to create the mapred system directory using a
+naming convention that will avoid clashes in multi-user shared
+cluster scenario.<br />(Hemanth Yamijala via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2756">HADOOP-2756</a>. NPE in DFSClient while closing DFSOutputStreams
+under load.<br />(rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2958">HADOOP-2958</a>. Fixed FileBench which broke due to <a href="http://issues.apache.org/jira/browse/HADOOP-2391">HADOOP-2391</a> which performs
+a check for existence of the output directory and a trivial bug in
+GenericMRLoadGenerator where min/max word lenghts were identical since
+they were looking at the same config variables<br />(Chris Douglas via
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2915">HADOOP-2915</a>. Fixed FileSystem.CACHE so that a username is included
+in the cache key. (Tsz Wo (Nicholas), SZE via nigel)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2813">HADOOP-2813</a>. TestDU unit test uses its own directory to run its
+sequence of tests.<br />(Mahadev Konar via dhruba)</li>
+    </ol>
+  </li>
+<h2><a href="javascript:toggleList('older')">Older Releases</a></h2>
+<ul id="older">
+<h3><a href="javascript:toggleList('release_0.16.0_-_2008-02-07_')">Release 0.16.0 - 2008-02-07
+<ul id="release_0.16.0_-_2008-02-07_">
+  <li><a href="javascript:toggleList('release_0.16.0_-_2008-02-07_._incompatible_changes_')">  INCOMPATIBLE CHANGES
+    <ol id="release_0.16.0_-_2008-02-07_._incompatible_changes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1245">HADOOP-1245</a>.  Use the mapred.tasktracker.tasks.maximum value
+configured on each tasktracker when allocating tasks, instead of
+the value configured on the jobtracker. InterTrackerProtocol
+version changed from 5 to 6.<br />(Michael Bieniosek via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1843">HADOOP-1843</a>. Removed code from Configuration and JobConf deprecated by
+<a href="http://issues.apache.org/jira/browse/HADOOP-785">HADOOP-785</a> and a minor fix to Configuration.toString. Specifically the
+important change is that mapred-default.xml is no longer supported and
+Configuration no longer supports the notion of default/final resources.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1302">HADOOP-1302</a>.  Remove deprecated abacus code from the contrib directory.
+This also fixes a configuration bug in AggregateWordCount, so that the
+job now works.<br />(enis)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2288">HADOOP-2288</a>.  Enhance FileSystem API to support access control.
+(Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2184">HADOOP-2184</a>.  RPC Support for user permissions and authentication.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2185">HADOOP-2185</a>.  RPC Server uses any available port if the specified
+port is zero. Otherwise it uses the specified port. Also combines
+the configuration attributes for the servers' bind address and
+port from "x.x.x.x" and "y" to "x.x.x.x:y".
+Deprecated configuration variables:
+  dfs.info.bindAddress
+  dfs.info.port
+  dfs.datanode.bindAddress
+  dfs.datanode.port
+  dfs.datanode.info.bindAdress
+  dfs.datanode.info.port
+  dfs.secondary.info.bindAddress
+  dfs.secondary.info.port
+  mapred.job.tracker.info.bindAddress
+  mapred.job.tracker.info.port
+  mapred.task.tracker.report.bindAddress
+  tasktracker.http.bindAddress
+  tasktracker.http.port
+New configuration variables (post <a href="http://issues.apache.org/jira/browse/HADOOP-2404">HADOOP-2404</a>):
+  dfs.secondary.http.address
+  dfs.datanode.address
+  dfs.datanode.http.address
+  dfs.http.address
+  mapred.job.tracker.http.address
+  mapred.task.tracker.report.address
+  mapred.task.tracker.http.address<br />(Konstantin Shvachko via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2401">HADOOP-2401</a>.  Only the current leaseholder can abandon a block for
+a HDFS file.  ClientProtocol version changed from 20 to 21.
+(Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2381">HADOOP-2381</a>.  Support permission information in FileStatus. Client
+Protocol version changed from 21 to 22.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2110">HADOOP-2110</a>. Block report processing creates fewer transient objects.
+Datanode Protocol version changed from 10 to 11.<br />(Sanjay Radia via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2567">HADOOP-2567</a>.  Add FileSystem#getHomeDirectory(), which returns the
+user's home directory in a FileSystem as a fully-qualified path.
+FileSystem#getWorkingDirectory() is also changed to return a
+fully-qualified path, which can break applications that attempt
+to, e.g., pass LocalFileSystem#getWorkingDir().toString() directly
+to java.io methods that accept file names.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2514">HADOOP-2514</a>.  Change trash feature to maintain a per-user trash
+directory, named ".Trash" in the user's home directory.  The
+"fs.trash.root" parameter is no longer used.  Full source paths
+are also no longer reproduced within the trash.
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2012">HADOOP-2012</a>. Periodic data verification on Datanodes.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1707">HADOOP-1707</a>. The DFSClient does not use a local disk file to cache
+writes to a HDFS file. Changed Data Transfer Version from 7 to 8.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2652">HADOOP-2652</a>. Fix permission issues for HftpFileSystem. This is an
+incompatible change since distcp may not be able to copy files
+from cluster A (compiled with this patch) to cluster B (compiled
+with previous versions). (Tsz Wo (Nicholas), SZE via dhruba)
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.16.0_-_2008-02-07_._new_features_')">  NEW FEATURES
+    <ol id="release_0.16.0_-_2008-02-07_._new_features_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1857">HADOOP-1857</a>.  Ability to run a script when a task fails to capture stack
+traces.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2299">HADOOP-2299</a>.  Defination of a login interface.  A simple implementation for
+Unix users and groups.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1652">HADOOP-1652</a>.  A utility to balance data among datanodes in a HDFS cluster.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2085">HADOOP-2085</a>.  A library to support map-side joins of consistently
+partitioned and sorted data sets.<br />(Chris Douglas via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1301">HADOOP-1301</a>.  Hadoop-On-Demand (HOD): resource management
+provisioning for Hadoop.<br />(Hemanth Yamijala via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2336">HADOOP-2336</a>. Shell commands to modify file permissions.<br />(rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1298">HADOOP-1298</a>. Implement file permissions for HDFS.
+(Tsz Wo (Nicholas) &amp; taton via cutting)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2447">HADOOP-2447</a>. HDFS can be configured to limit the total number of
+objects (inodes and blocks) in the file system.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2487">HADOOP-2487</a>. Added an option to get statuses for all submitted/run jobs.
+This information can be used to develop tools for analysing jobs.<br />(Amareshwari Sri Ramadasu via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1873">HADOOP-1873</a>. Implement user permissions for Map/Reduce framework.<br />(Hairong Kuang via shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2532">HADOOP-2532</a>.  Add to MapFile a getClosest method that returns the key
+that comes just before if the key is not present.<br />(stack via tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1883">HADOOP-1883</a>. Add versioning to Record I/O.<br />(Vivek Ratan via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2603">HADOOP-2603</a>.  Add SeqeunceFileAsBinaryInputFormat, which reads
+sequence files as BytesWritable/BytesWritable regardless of the
+key and value types used to write the file.<br />(cdouglas via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2367">HADOOP-2367</a>. Add ability to profile a subset of map/reduce tasks and fetch
+the result to the local filesystem of the submitting application. Also
+includes a general IntegerRanges extension to Configuration for setting
+positive, ranged parameters.<br />(Owen O'Malley via cdouglas)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.16.0_-_2008-02-07_._improvements_')">  IMPROVEMENTS
+    <ol id="release_0.16.0_-_2008-02-07_._improvements_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2045">HADOOP-2045</a>.  Change committer list on website to a table, so that
+folks can list their organization, timezone, etc.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2058">HADOOP-2058</a>.  Facilitate creating new datanodes dynamically in
+MiniDFSCluster.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1855">HADOOP-1855</a>.  fsck verifies block placement policies and reports
+violations.<br />(Konstantin Shvachko via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1604">HADOOP-1604</a>.  An system administrator can finalize namenode upgrades
+without running the cluster.<br />(Konstantin Shvachko via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1839">HADOOP-1839</a>.  Link-ify the Pending/Running/Complete/Killed grid in
+jobdetails.jsp to help quickly narrow down and see categorized TIPs'
+details via jobtasks.jsp.<br />(Amar Kamat via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1210">HADOOP-1210</a>.  Log counters in job history.<br />(Owen O'Malley via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1912">HADOOP-1912</a>. Datanode has two new commands COPY and REPLACE. These are
+needed for supporting data rebalance.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2086">HADOOP-2086</a>. This patch adds the ability to add dependencies to a job
+(run via JobControl) after construction.<br />(Adrian Woodhead via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1185">HADOOP-1185</a>. Support changing the logging level of a server without
+restarting the server.  (Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2134">HADOOP-2134</a>.  Remove developer-centric requirements from overview.html and
+keep it end-user focussed, specifically sections related to subversion and
+building Hadoop.<br />(Jim Kellerman via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1989">HADOOP-1989</a>. Support simulated DataNodes. This helps creating large virtual
+clusters for testing purposes.<br />(Sanjay Radia via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1274">HADOOP-1274</a>. Support different number of mappers and reducers per
+TaskTracker to  allow administrators to better configure and utilize
+heterogenous clusters.
+Configuration changes to hadoop-default.xml:
+  add mapred.tasktracker.map.tasks.maximum (default value of 2)
+  add mapred.tasktracker.reduce.tasks.maximum (default value of 2)
+  remove mapred.tasktracker.tasks.maximum (deprecated for 0.16.0)<br />(Amareshwari Sri Ramadasu via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2104">HADOOP-2104</a>. Adds a description to the ant targets. This makes the
+output of "ant -projecthelp" sensible.<br />(Chris Douglas via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2127">HADOOP-2127</a>. Added a pipes sort example to benchmark trivial pipes
+application versus trivial java application.<br />(omalley via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2113">HADOOP-2113</a>. A new shell command "dfs -text" to view the contents of
+a gziped or SequenceFile.<br />(Chris Douglas via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2207">HADOOP-2207</a>.  Add a "package" target for contrib modules that
+permits each to determine what files are copied into release
+builds.<br />(stack via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1984">HADOOP-1984</a>. Makes the backoff for failed fetches exponential.
+Earlier, it was a random backoff from an interval.<br />(Amar Kamat via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1327">HADOOP-1327</a>.  Include website documentation for streaming.<br />(Rob Weltman
+via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2000">HADOOP-2000</a>.  Rewrite NNBench to measure namenode performance accurately.
+It now uses the map-reduce framework for load generation.<br />(Mukund Madhugiri via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2248">HADOOP-2248</a>. Speeds up the framework w.r.t Counters. Also has API
+updates to the Counters part.<br />(Owen O'Malley via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2326">HADOOP-2326</a>. The initial block report at Datanode startup time has
+a random backoff period.<br />(Sanjay Radia via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2432">HADOOP-2432</a>. HDFS includes the name of the file while throwing
+"File does not exist"  exception.<br />(Jim Kellerman via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2457">HADOOP-2457</a>. Added a 'forrest.home' property to the 'docs' target in
+build.xml.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2149">HADOOP-2149</a>.  A new benchmark for three name-node operation: file create,
+open, and block report, to evaluate the name-node performance
+for optimizations or new features.<br />(Konstantin Shvachko via shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2466">HADOOP-2466</a>. Change FileInputFormat.computeSplitSize to a protected
+non-static method to allow sub-classes to provide alternate
+implementations.<br />(Alejandro Abdelnur via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2425">HADOOP-2425</a>. Change TextOutputFormat to handle Text specifically for better
+performance. Make NullWritable implement Comparable. Make TextOutputFormat
+treat NullWritable like null.<br />(omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1719">HADOOP-1719</a>. Improves the utilization of shuffle copier threads.<br />(Amar Kamat via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2390">HADOOP-2390</a>. Added documentation for user-controls for intermediate
+map-outputs &amp; final job-outputs and native-hadoop libraries.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1660">HADOOP-1660</a>. Add the cwd of the map/reduce task to the java.library.path
+of the child-jvm to support loading of native libraries distributed via
+the DistributedCache.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2285">HADOOP-2285</a>. Speeds up TextInputFormat. Also includes updates to the
+Text API.<br />(Owen O'Malley via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2233">HADOOP-2233</a>. Adds a generic load generator for modeling MR jobs.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2369">HADOOP-2369</a>. Adds a set of scripts for simulating a mix of user map/reduce
+workloads.<br />(Runping Qi via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2547">HADOOP-2547</a>. Removes use of a 'magic number' in build.xml.<br />(Hrishikesh via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2268">HADOOP-2268</a>. Fix org.apache.hadoop.mapred.jobcontrol classes to use the
+List/Map interfaces rather than concrete ArrayList/HashMap classes
+internally.<br />(Adrian Woodhead via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2406">HADOOP-2406</a>. Add a benchmark for measuring read/write performance through
+the InputFormat interface, particularly with compression.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2131">HADOOP-2131</a>. Allow finer-grained control over speculative-execution. Now
+users can set it for maps and reduces independently.
+Configuration changes to hadoop-default.xml:
+  deprecated mapred.speculative.execution
+  add mapred.map.tasks.speculative.execution
+  add mapred.reduce.tasks.speculative.execution<br />(Amareshwari Sri Ramadasu via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1965">HADOOP-1965</a>. Interleave sort/spill in teh map-task along with calls to the
+Mapper.map method. This is done by splitting the 'io.sort.mb' buffer into
+two and using one half for collecting map-outputs and the other half for
+sort/spill.<br />(Amar Kamat via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2464">HADOOP-2464</a>. Unit tests for chmod, chown, and chgrp using DFS.<br />(Raghu Angadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1876">HADOOP-1876</a>. Persist statuses of completed jobs in HDFS so that the
+JobClient can query and get information about decommissioned jobs and also
+across JobTracker restarts.
+Configuration changes to hadoop-default.xml:
+  add mapred.job.tracker.persist.jobstatus.active (default value of false)
+  add mapred.job.tracker.persist.jobstatus.hours (default value of 0)
+  add mapred.job.tracker.persist.jobstatus.dir (default value of
+                                                /jobtracker/jobsInfo)<br />(Alejandro Abdelnur via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2077">HADOOP-2077</a>. Added version and build information to STARTUP_MSG for all
+hadoop daemons to aid error-reporting, debugging etc.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2398">HADOOP-2398</a>. Additional instrumentation for NameNode and RPC server.
+Add support for accessing instrumentation statistics via JMX.<br />(Sanjay radia via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2449">HADOOP-2449</a>. A return of the non-MR version of NNBench.<br />(Sanjay Radia via shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1989">HADOOP-1989</a>. Remove 'datanodecluster' command from bin/hadoop.<br />(Sanjay Radia via shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1742">HADOOP-1742</a>. Improve JavaDoc documentation for ClientProtocol, DFSClient,
+and FSNamesystem.<br />(Konstantin Shvachko)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2298">HADOOP-2298</a>. Add Ant target for a binary-only distribution.<br />(Hrishikesh via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2509">HADOOP-2509</a>. Add Ant target for Rat report (Apache license header
+reports).<br />(Hrishikesh via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2469">HADOOP-2469</a>.  WritableUtils.clone should take a Configuration
+instead of a JobConf.<br />(stack via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2659">HADOOP-2659</a>. Introduce superuser permissions for admin operations.
+(Tsz Wo (Nicholas), SZE via shv)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2596">HADOOP-2596</a>. Added a SequenceFile.createWriter api which allows the user
+to specify the blocksize, replication factor and the buffersize to be
+used for the underlying HDFS file.<br />(Alejandro Abdelnur via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2431">HADOOP-2431</a>. Test HDFS File Permissions.<br />(Hairong Kuang via shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2232">HADOOP-2232</a>. Add an option to disable Nagle's algorithm in the IPC stack.<br />(Clint Morgan via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2342">HADOOP-2342</a>. Created a micro-benchmark for measuring
+local-file versus hdfs reads.<br />(Owen O'Malley via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2529">HADOOP-2529</a>. First version of HDFS User Guide.<br />(Raghu Angadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2690">HADOOP-2690</a>. Add jar-test target to build.xml, separating compilation
+and packaging of the test classes.<br />(Enis Soztutar via cdouglas)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.16.0_-_2008-02-07_._optimizations_')">  OPTIMIZATIONS
+    <ol id="release_0.16.0_-_2008-02-07_._optimizations_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1898">HADOOP-1898</a>.  Release the lock protecting the last time of the last stack
+dump while the dump is happening.<br />(Amareshwari Sri Ramadasu via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1900">HADOOP-1900</a>. Makes the heartbeat and task event queries interval
+dependent on the cluster size.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2208">HADOOP-2208</a>. Counter update frequency (from TaskTracker to JobTracker) is
+capped at 1 minute.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2284">HADOOP-2284</a>. Reduce the number of progress updates during the sorting in
+the map task.<br />(Amar Kamat via ddas)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.16.0_-_2008-02-07_._bug_fixes_')">  BUG FIXES
+    <ol id="release_0.16.0_-_2008-02-07_._bug_fixes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2583">HADOOP-2583</a>.  Fixes a bug in the Eclipse plug-in UI to edit locations.
+Plug-in version is now synchronized with Hadoop version.
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2100">HADOOP-2100</a>.  Remove faulty check for existence of $HADOOP_PID_DIR and let
+'mkdir -p' check &amp; create it.<br />(Michael Bieniosek via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1642">HADOOP-1642</a>.  Ensure jobids generated by LocalJobRunner are unique to
+avoid collissions and hence job-failures.<br />(Doug Cutting via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2096">HADOOP-2096</a>.  Close open file-descriptors held by streams while localizing
+job.xml in the JobTracker and while displaying it on the webui in
+jobconf.jsp.<br />(Amar Kamat via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2098">HADOOP-2098</a>.  Log start &amp; completion of empty jobs to JobHistory, which
+also ensures that we close the file-descriptor of the job's history log
+opened during job-submission.<br />(Amar Kamat via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2112">HADOOP-2112</a>.  Adding back changes to build.xml lost while reverting
+<a href="http://issues.apache.org/jira/browse/HADOOP-1622">HADOOP-1622</a> i.e. http://svn.apache.org/viewvc?view=rev&amp;revision=588771.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2089">HADOOP-2089</a>.  Fixes the command line argument handling to handle multiple
+-cacheArchive in Hadoop streaming.<br />(Lohit Vijayarenu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2071">HADOOP-2071</a>.  Fix StreamXmlRecordReader to use a BufferedInputStream
+wrapped over the DFSInputStream since mark/reset aren't supported by
+DFSInputStream anymore.<br />(Lohit Vijayarenu via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1348">HADOOP-1348</a>.  Allow XML comments inside configuration files.<br />(Rajagopal Natarajan and Enis Soztutar via enis)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1952">HADOOP-1952</a>.  Improve handling of invalid, user-specified classes while
+configuring streaming jobs such as combiner, input/output formats etc.
+Now invalid options are caught, logged and jobs are failed early.<br />(Lohit
+Vijayarenu via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2151">HADOOP-2151</a>. FileSystem.globPaths validates the list of Paths that
+it returns.<br />(Lohit Vijayarenu via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2121">HADOOP-2121</a>. Cleanup DFSOutputStream when the stream encountered errors
+when Datanodes became full.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1130">HADOOP-1130</a>. The FileSystem.closeAll() method closes all existing
+DFSClients.<br />(Chris Douglas via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2204">HADOOP-2204</a>. DFSTestUtil.waitReplication was not waiting for all replicas
+to get created, thus causing unit test failure.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2078">HADOOP-2078</a>. An zero size file may have no blocks associated with it.<br />(Konstantin Shvachko via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2212">HADOOP-2212</a>. ChecksumFileSystem.getSumBufferSize might throw
+java.lang.ArithmeticException. The fix is to initialize bytesPerChecksum
+to 0.<br />(Michael Bieniosek via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2216">HADOOP-2216</a>.  Fix jobtasks.jsp to ensure that it first collects the
+taskids which satisfy the filtering criteria and then use that list to
+print out only the required task-reports, previously it was oblivious to
+the filtering and hence used the wrong index into the array of task-reports.<br />(Amar Kamat via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2272">HADOOP-2272</a>.  Fix findbugs target to reflect changes made to the location
+of the streaming jar file by <a href="http://issues.apache.org/jira/browse/HADOOP-2207">HADOOP-2207</a>.<br />(Adrian Woodhead via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2244">HADOOP-2244</a>.  Fixes the MapWritable.readFields to clear the instance
+field variable every time readFields is called. (Michael Stack via ddas).
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2245">HADOOP-2245</a>.  Fixes LocalJobRunner to include a jobId in the mapId. Also,
+adds a testcase for JobControl. (Adrian Woodhead via ddas).
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2275">HADOOP-2275</a>. Fix erroneous detection of corrupted file when namenode
+fails to allocate any datanodes for newly allocated block.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2256">HADOOP-2256</a>. Fix a buf in the namenode that could cause it to encounter
+an infinite loop while deleting excess replicas that were created by
+block rebalancing.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2209">HADOOP-2209</a>. SecondaryNamenode process exits if it encounters exceptions
+that it cannot handle.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2314">HADOOP-2314</a>. Prevent TestBlockReplacement from occasionally getting
+into an infinite loop.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2300">HADOOP-2300</a>. This fixes a bug where mapred.tasktracker.tasks.maximum
+would be ignored even if it was set in hadoop-site.xml.<br />(Amareshwari Sri Ramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2349">HADOOP-2349</a>.  Improve code layout in file system transaction logging code.
+(Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2368">HADOOP-2368</a>.  Fix unit tests on Windows.
+(Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2363">HADOOP-2363</a>.  This fix allows running multiple instances of the unit test
+in parallel. The bug was introduced in <a href="http://issues.apache.org/jira/browse/HADOOP-2185">HADOOP-2185</a> that changed
+port-rolling behaviour.<br />(Konstantin Shvachko via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2271">HADOOP-2271</a>.  Fix chmod task to be non-parallel.<br />(Adrian Woodhead via
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2313">HADOOP-2313</a>.  Fail the build if building libhdfs fails.<br />(nigel via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2359">HADOOP-2359</a>.  Remove warning for interruptted exception when closing down
+minidfs.<br />(dhruba via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1841">HADOOP-1841</a>. Prevent slow clients from consuming threads in the NameNode.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2323">HADOOP-2323</a>. JobTracker.close() should not print stack traces for
+normal exit.<br />(jimk via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2376">HADOOP-2376</a>. Prevents sort example from overriding the number of maps.<br />(Owen O'Malley via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2434">HADOOP-2434</a>. FSDatasetInterface read interface causes HDFS reads to occur
+in 1 byte chunks, causing performance degradation.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2459">HADOOP-2459</a>. Fix package target so that src/docs/build files are not
+included in the release.<br />(nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2215">HADOOP-2215</a>.  Fix documentation in cluster_setup.html &amp;
+mapred_tutorial.html reflect that mapred.tasktracker.tasks.maximum has
+been superceeded by mapred.tasktracker.{map|reduce}.tasks.maximum.<br />(Amareshwari Sri Ramadasu via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2459">HADOOP-2459</a>. Fix package target so that src/docs/build files are not
+included in the release.<br />(nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2352">HADOOP-2352</a>. Remove AC_CHECK_LIB for libz and liblzo to ensure that
+libhadoop.so doesn't have a dependency on them.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2453">HADOOP-2453</a>. Fix the configuration for wordcount-simple example in Hadoop
+Pipes which currently produces an XML parsing error.<br />(Amareshwari Sri
+Ramadasu via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2476">HADOOP-2476</a>. Unit test failure while reading permission bits of local
+file system (on Windows) fixed.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2247">HADOOP-2247</a>.  Fine-tune the strategies for killing mappers and reducers
+due to failures while fetching map-outputs. Now the map-completion times
+and number of currently running reduces are taken into account by the
+JobTracker before  killing the mappers, while the progress made by the
+reducer and the number of fetch-failures vis-a-vis total number of
+fetch-attempts are taken into account before teh reducer kills itself.<br />(Amar Kamat via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2452">HADOOP-2452</a>. Fix eclipse plug-in build.xml to refers to the right
+location where hadoop-*-core.jar is generated.<br />(taton)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2492">HADOOP-2492</a>. Additional debugging in the rpc server to better
+diagnose ConcurrentModificationException.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2344">HADOOP-2344</a>. Enhance the utility for executing shell commands to read the
+stdout/stderr streams while waiting for the command to finish (to free up
+the buffers). Also, this patch throws away stderr of the DF utility.
+  org.apache.hadoop.fs.ShellCommand for org.apache.hadoop.util.Shell
+  org.apache.hadoop.util.ShellUtil for
+    org.apache.hadoop.util.Shell.ShellCommandExecutor<br />(Amar Kamat via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2511">HADOOP-2511</a>. Fix a javadoc warning in org.apache.hadoop.util.Shell
+introduced by <a href="http://issues.apache.org/jira/browse/HADOOP-2344">HADOOP-2344</a>.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2442">HADOOP-2442</a>. Fix TestLocalFileSystemPermission.testLocalFSsetOwner
+to work on more platforms.<br />(Raghu Angadi via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2488">HADOOP-2488</a>. Fix a regression in random read performance.<br />(Michael Stack via rangadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2523">HADOOP-2523</a>. Fix TestDFSShell.testFilePermissions on Windows.<br />(Raghu Angadi via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2535">HADOOP-2535</a>. Removed support for deprecated mapred.child.heap.size and
+fixed some indentation issues in TaskRunner. (acmurthy)
+Configuration changes to hadoop-default.xml:
+  remove mapred.child.heap.size
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2512">HADOOP-2512</a>. Fix error stream handling in Shell. Use exit code to
+detect shell command errors in RawLocalFileSystem.<br />(Raghu Angadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2446">HADOOP-2446</a>. Fixes TestHDFSServerPorts and TestMRServerPorts so they
+do not rely on statically configured ports and cleanup better.<br />(nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2537">HADOOP-2537</a>. Make build process compatible with Ant 1.7.0.<br />(Hrishikesh via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1281">HADOOP-1281</a>. Ensure running tasks of completed map TIPs (e.g. speculative
+tasks) are killed as soon as the TIP completed.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2571">HADOOP-2571</a>. Suppress a suprious warning in test code.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2481">HADOOP-2481</a>. NNBench report its progress periodically.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2601">HADOOP-2601</a>. Start name-node on a free port for TestNNThroughputBenchmark.<br />(Konstantin Shvachko)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2494">HADOOP-2494</a>.  Set +x on contrib/*/bin/* in packaged tar bundle.<br />(stack via tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2605">HADOOP-2605</a>. Remove bogus leading slash in task-tracker report bindAddress.<br />(Konstantin Shvachko)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2620">HADOOP-2620</a>. Trivial. 'bin/hadoop fs -help' did not list chmod, chown, and
+chgrp.<br />(Raghu Angadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2614">HADOOP-2614</a>. The DFS WebUI accesses are configured to be from the user
+specified by dfs.web.ugi.  (Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2543">HADOOP-2543</a>. Implement a "no-permission-checking" mode for smooth
+upgrade from a pre-0.16 install of HDFS.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-290">HADOOP-290</a>. A DataNode log message now prints the target of a replication
+request correctly.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2538">HADOOP-2538</a>. Redirect to a warning, if plaintext parameter is true but
+the filter parameter is not given in TaskLogServlet.<br />(Michael Bieniosek via enis)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2582">HADOOP-2582</a>. Prevent 'bin/hadoop fs -copyToLocal' from creating
+zero-length files when the src does not exist.<br />(Lohit Vijayarenu via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2189">HADOOP-2189</a>. Incrementing user counters should count as progress.<br />(ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2649">HADOOP-2649</a>. The NameNode periodically computes replication work for
+the datanodes. The periodicity of this computation is now configurable.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2549">HADOOP-2549</a>. Correct disk size computation so that data-nodes could switch
+to other local drives if current is full.<br />(Hairong Kuang via shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2633">HADOOP-2633</a>. Fsck should call name-node methods directly rather than
+through rpc. (Tsz Wo (Nicholas), SZE via shv)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2687">HADOOP-2687</a>. Modify a few log message generated by dfs client to be
+logged only at INFO level.<br />(stack via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2402">HADOOP-2402</a>. Fix BlockCompressorStream to ensure it buffers data before
+sending it down to the compressor so that each write call doesn't
+compress.<br />(Chris Douglas via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2645">HADOOP-2645</a>. The Metrics initialization code does not throw
+exceptions when servers are restarted by MiniDFSCluster.<br />(Sanjay Radia via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2691">HADOOP-2691</a>. Fix a race condition that was causing the DFSClient
+to erroneously remove a good datanode from a pipeline that actually
+had another datanode that was bad.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1195">HADOOP-1195</a>. All code in FSNamesystem checks the return value
+of getDataNode for null before using it.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2640">HADOOP-2640</a>. Fix a bug in MultiFileSplitInputFormat that was always
+returning 1 split in some circumstances.<br />(Enis Soztutar via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2626">HADOOP-2626</a>. Fix paths with special characters to work correctly
+with the local filesystem.<br />(Thomas Friol via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2646">HADOOP-2646</a>. Fix SortValidator to work with fully-qualified
+working directories.<br />(Arun C Murthy via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2092">HADOOP-2092</a>. Added a ping mechanism to the pipes' task to periodically
+check if the parent Java task is running, and exit if the parent isn't
+alive and responding.<br />(Amareshwari Sri Ramadasu via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2714">HADOOP-2714</a>. TestDecommission failed on windows because the replication
+request was timing out.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2576">HADOOP-2576</a>. Namenode performance degradation over time triggered by
+large heartbeat interval.<br />(Raghu Angadi)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2720">HADOOP-2720</a>. Jumbo bug fix patch to HOD.  Final sync of Apache SVN with
+internal Yahoo SVN.<br />(Hemanth Yamijala via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2713">HADOOP-2713</a>. TestDatanodeDeath failed on windows because the replication
+request was timing out.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2639">HADOOP-2639</a>. Fixes a problem to do with incorrect maintenance of values
+for runningMapTasks/runningReduceTasks.<br />(Amar Kamat and Arun Murthy
+via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2723">HADOOP-2723</a>. Fixed the check for checking whether to do user task
+profiling.<br />(Amareshwari Sri Ramadasu via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2734">HADOOP-2734</a>. Link forrest docs to new http://hadoop.apache.org<br />(Doug Cutting via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2641">HADOOP-2641</a>. Added Apache license headers to 95 files.<br />(nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2732">HADOOP-2732</a>. Fix bug in path globbing.<br />(Hairong Kuang via nigel)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2404">HADOOP-2404</a>. Fix backwards compatability with hadoop-0.15 configuration
+files that was broken by <a href="http://issues.apache.org/jira/browse/HADOOP-2185">HADOOP-2185</a>.<br />(omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2740">HADOOP-2740</a>. Fix HOD to work with the configuration variables changed in
+<a href="http://issues.apache.org/jira/browse/HADOOP-2404">HADOOP-2404</a>.<br />(Hemanth Yamijala via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2755">HADOOP-2755</a>. Fix fsck performance degradation because of permissions
+issue.  (Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2768">HADOOP-2768</a>. Fix performance regression caused by <a href="http://issues.apache.org/jira/browse/HADOOP-1707">HADOOP-1707</a>.<br />(dhruba borthakur via nigel)</li>
+    </ol>
+  </li>
+<h3><a href="javascript:toggleList('release_0.15.3_-_2008-01-18_')">Release 0.15.3 - 2008-01-18
+<ul id="release_0.15.3_-_2008-01-18_">
+  <li><a href="javascript:toggleList('release_0.15.3_-_2008-01-18_._bug_fixes_')">  BUG FIXES
+    <ol id="release_0.15.3_-_2008-01-18_._bug_fixes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2562">HADOOP-2562</a>. globPaths supports {ab,cd}.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2540">HADOOP-2540</a>. fsck reports missing blocks incorrectly.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2570">HADOOP-2570</a>. "work" directory created unconditionally, and symlinks
+created from the task cwds.
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2574">HADOOP-2574</a>. Fixed mapred_tutorial.xml to correct minor errors with the
+WordCount examples.<br />(acmurthy)</li>
+    </ol>
+  </li>
+<h3><a href="javascript:toggleList('release_0.15.2_-_2008-01-02_')">Release 0.15.2 - 2008-01-02
+<ul id="release_0.15.2_-_2008-01-02_">
+  <li><a href="javascript:toggleList('release_0.15.2_-_2008-01-02_._bug_fixes_')">  BUG FIXES
+    <ol id="release_0.15.2_-_2008-01-02_._bug_fixes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2246">HADOOP-2246</a>.  Moved the changelog for <a href="http://issues.apache.org/jira/browse/HADOOP-1851">HADOOP-1851</a> from the NEW FEATURES
+section to the INCOMPATIBLE CHANGES section.<br />(acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2238">HADOOP-2238</a>.  Fix TaskGraphServlet so that it sets the content type of
+the response appropriately.<br />(Paul Saab via enis)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2129">HADOOP-2129</a>.  Fix so that distcp works correctly when source is
+HDFS but not the default filesystem.  HDFS paths returned by the
+listStatus() method are now fully-qualified.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2378">HADOOP-2378</a>.  Fixes a problem where the last task completion event would
+get created after the job completes.<br />(Alejandro Abdelnur via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2228">HADOOP-2228</a>.  Checks whether a job with a certain jobId is already running
+and then tries to create the JobInProgress object.<br />(Johan Oskarsson via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2422">HADOOP-2422</a>.  dfs -cat multiple files fail with 'Unable to write to
+output stream'.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2460">HADOOP-2460</a>.  When the namenode encounters ioerrors on writing a
+transaction log, it stops writing new transactions to that one.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2227">HADOOP-2227</a>.  Use the LocalDirAllocator uniformly for handling all of the
+temporary storage required for a given task. It also implies that
+mapred.local.dir.minspacestart is handled by checking if there is enough
+free-space on any one of the available disks.<br />(Amareshwari Sri Ramadasu
+via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2437">HADOOP-2437</a>.  Fix the LocalDirAllocator to choose the seed for the
+round-robin disk selections randomly. This helps in spreading data across
+multiple partitions much better.<br />(acmurhty)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2486">HADOOP-2486</a>. When the list of files from the InMemoryFileSystem is obtained
+for merging, this patch will ensure that only those files whose checksums
+have also got created (renamed) are returned.<br />(ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2456">HADOOP-2456</a>. Hardcode English locale to prevent NumberFormatException
+from occurring when starting the NameNode with certain locales.<br />(Matthias Friedrich via nigel)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.15.2_-_2008-01-02_._improvements_')">  IMPROVEMENTS
+    <ol id="release_0.15.2_-_2008-01-02_._improvements_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2160">HADOOP-2160</a>.  Remove project-level, non-user documentation from
+releases, since it's now maintained in a separate tree.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1327">HADOOP-1327</a>.  Add user documentation for streaming.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2382">HADOOP-2382</a>.  Add hadoop-default.html to subversion.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2158">HADOOP-2158</a>. hdfsListDirectory calls FileSystem.listStatus instead
+of FileSystem.listPaths. This reduces the number of RPC calls on the
+namenode, thereby improving scalability.<br />(Christian Kunz via dhruba)</li>
+    </ol>
+  </li>
+<h3><a href="javascript:toggleList('release_0.15.1_-_2007-11-27_')">Release 0.15.1 - 2007-11-27
+<ul id="release_0.15.1_-_2007-11-27_">
+  <li><a href="javascript:toggleList('release_0.15.1_-_2007-11-27_._incompatible_changes_')">  INCOMPATIBLE CHANGES
+    <ol id="release_0.15.1_-_2007-11-27_._incompatible_changes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-713">HADOOP-713</a>.  Reduce CPU usage on namenode while listing directories.
+FileSystem.listPaths does not return the size of the entire subtree.
+Introduced a new API ClientProtocol.getContentLength that returns the
+size of the subtree.<br />(Dhruba Borthakur via dhruba)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.15.1_-_2007-11-27_._improvements_')">  IMPROVEMENTS
+    <ol id="release_0.15.1_-_2007-11-27_._improvements_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1917">HADOOP-1917</a>.  Addition of guides/tutorial for better overall
+documentation for Hadoop. Specifically:
+* quickstart.html is targetted towards first-time users and helps them
+  setup a single-node cluster and play with Hadoop.
+* cluster_setup.html helps admins to configure and setup non-trivial
+  hadoop clusters.
+* mapred_tutorial.html is a comprehensive Map-Reduce tutorial.<br />(acmurthy)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.15.1_-_2007-11-27_._bug_fixes_')">  BUG FIXES
+    <ol id="release_0.15.1_-_2007-11-27_._bug_fixes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2174">HADOOP-2174</a>.  Removed the unnecessary Reporter.setStatus call from
+FSCopyFilesMapper.close which led to a NPE since the reporter isn't valid
+in the close method.<br />(Chris Douglas via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2172">HADOOP-2172</a>.  Restore performance of random access to local files
+by caching positions of local input streams, avoiding a system
+call.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2205">HADOOP-2205</a>.  Regenerate the Hadoop website since some of the changes made
+by <a href="http://issues.apache.org/jira/browse/HADOOP-1917">HADOOP-1917</a> weren't correctly copied over to the trunk/docs directory.
+Also fixed a couple of minor typos and broken links.<br />(acmurthy)</li>
+    </ol>
+  </li>
+<h3><a href="javascript:toggleList('release_0.15.0_-_2007-11-2_')">Release 0.15.0 - 2007-11-2
+<ul id="release_0.15.0_-_2007-11-2_">
+  <li><a href="javascript:toggleList('release_0.15.0_-_2007-11-2_._incompatible_changes_')">  INCOMPATIBLE CHANGES
+    <ol id="release_0.15.0_-_2007-11-2_._incompatible_changes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1708">HADOOP-1708</a>.  Make files appear in namespace as soon as they are
+created.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-999">HADOOP-999</a>.  A HDFS Client immediately informs the NameNode of a new
+file creation.  ClientProtocol version changed from 14 to 15.
+(Tsz Wo (Nicholas), SZE via dhruba)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-932">HADOOP-932</a>.  File locking interfaces and implementations (that were
+earlier deprecated) are removed.  Client Protocol version changed
+from 15 to 16.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1621">HADOOP-1621</a>.  FileStatus is now a concrete class and FileSystem.listPaths
+is deprecated and replaced with listStatus.<br />(Chris Douglas via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1656">HADOOP-1656</a>.  The blockSize of a file is stored persistently in the file
+inode.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1838">HADOOP-1838</a>.  The blocksize of files created with an earlier release is
+set to the default block size.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-785">HADOOP-785</a>.  Add support for 'final' Configuration parameters,
+removing support for 'mapred-default.xml', and changing
+'hadoop-site.xml' to not override other files.  Now folks should
+generally use 'hadoop-site.xml' for all configurations.  Values
+with a 'final' tag may not be overridden by subsequently loaded
+configuration files, e.g., by jobs.<br />(Arun C. Murthy via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1846">HADOOP-1846</a>. DatanodeReport in ClientProtocol can report live
+datanodes, dead datanodes or all datanodes. Client Protocol version
+changed from 17 to 18.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1851">HADOOP-1851</a>.  Permit specification of map output compression type
+and codec, independent of the final output's compression
+parameters.<br />(Arun C Murthy via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1819">HADOOP-1819</a>.  Jobtracker cleanups, including binding ports before
+clearing state directories, so that inadvertently starting a
+second jobtracker doesn't trash one that's already running. Removed
+method JobTracker.getTracker() because the static variable, which
+stored the value caused initialization problems.<br />(omalley via cutting)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.15.0_-_2007-11-2_._new_features_')">  NEW FEATURES
+    <ol id="release_0.15.0_-_2007-11-2_._new_features_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-89">HADOOP-89</a>.  A client can access file data even before the creator
+has closed the file. Introduce a new command "tail" from dfs shell.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1636">HADOOP-1636</a>.  Allow configuration of the number of jobs kept in
+memory by the JobTracker.<br />(Michael Bieniosek via omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1667">HADOOP-1667</a>.  Reorganize CHANGES.txt into sections to make it
+easier to read.  Also remove numbering, to make merging easier.<br />(cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1610">HADOOP-1610</a>.  Add metrics for failed tasks.<br />(Devaraj Das via tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1767">HADOOP-1767</a>.  Add "bin/hadoop job -list" sub-command.<br />(taton via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1351">HADOOP-1351</a>.  Add "bin/hadoop job [-fail-task|-kill-task]" sub-commands
+to terminate a particular task-attempt.<br />(Enis Soztutar via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1880">HADOOP-1880</a>. SleepJob : An example job that sleeps at each map and
+reduce task.<br />(enis)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1809">HADOOP-1809</a>. Add a link in web site to #hadoop IRC channel.<br />(enis)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1894">HADOOP-1894</a>. Add percentage graphs and mapred task completion graphs
+to Web User Interface. Users not using Firefox may install a plugin to
+their browsers to see svg graphics.<br />(enis)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1914">HADOOP-1914</a>. Introduce a new NamenodeProtocol to allow secondary
+namenodes and rebalancing processes to communicate with a primary
+namenode.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1963">HADOOP-1963</a>.  Add a FileSystem implementation for the Kosmos
+Filesystem (KFS).<br />(Sriram Rao via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1822">HADOOP-1822</a>.  Allow the specialization and configuration of socket
+factories. Provide a StandardSocketFactory, and a SocksSocketFactory to
+allow the use of SOCKS proxies. (taton).
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1968">HADOOP-1968</a>. FileSystem supports wildcard input syntax "{ }".<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-2566">HADOOP-2566</a>. Add globStatus method to the FileSystem interface
+and deprecate globPath and listPath.<br />(Hairong Kuang via hairong)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.15.0_-_2007-11-2_._optimizations_')">  OPTIMIZATIONS
+    <ol id="release_0.15.0_-_2007-11-2_._optimizations_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1910">HADOOP-1910</a>.  Reduce the number of RPCs that DistributedFileSystem.create()
+makes to the namenode.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1565">HADOOP-1565</a>.  Reduce memory usage of NameNode by replacing
+TreeMap in HDFS Namespace with ArrayList.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1743">HADOOP-1743</a>.  Change DFS INode from a nested class to standalone
+class, with specialized subclasses for directories and files, to
+save memory on the namenode.<br />(Konstantin Shvachko via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1759">HADOOP-1759</a>.  Change file name in INode from String to byte[],
+saving memory on the namenode.<br />(Konstantin Shvachko via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1766">HADOOP-1766</a>.  Save memory in namenode by having BlockInfo extend
+Block, and replace many uses of Block with BlockInfo.<br />(Konstantin Shvachko via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1687">HADOOP-1687</a>.  Save memory in namenode by optimizing BlockMap
+representation.<br />(Konstantin Shvachko via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1774">HADOOP-1774</a>. Remove use of INode.parent in Block CRC upgrade.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1788">HADOOP-1788</a>.  Increase the buffer size on the Pipes command socket.<br />(Amareshwari Sri Ramadasu and Christian Kunz via omalley)</li>
+    </ol>
+  </li>
+  <li><a href="javascript:toggleList('release_0.15.0_-_2007-11-2_._bug_fixes_')">  BUG FIXES
+    <ol id="release_0.15.0_-_2007-11-2_._bug_fixes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1946">HADOOP-1946</a>.  The Datanode code does not need to invoke du on
+every heartbeat.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1935">HADOOP-1935</a>. Fix a NullPointerException in internalReleaseCreate.<br />(Dhruba Borthakur)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1933">HADOOP-1933</a>. The nodes listed in include and exclude files
+are always listed in the datanode report.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1953">HADOOP-1953</a>. The job tracker should wait beteween calls to try and delete
+the system directory<br />(Owen O'Malley via devaraj)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1932">HADOOP-1932</a>. TestFileCreation fails with message saying filestatus.dat
+is of incorrect size.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1573">HADOOP-1573</a>. Support for 0 reducers in PIPES.<br />(Owen O'Malley via devaraj)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1500">HADOOP-1500</a>. Fix typographical errors in the DFS WebUI.<br />(Nigel Daley via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1076">HADOOP-1076</a>. Periodic checkpoint can continue even if an earlier
+checkpoint encountered an error.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1887">HADOOP-1887</a>. The Namenode encounters an ArrayIndexOutOfBoundsException
+while listing a directory that had a file that was
+being actively written to.<br />(Dhruba Borthakur via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1904">HADOOP-1904</a>. The Namenode encounters an exception because the
+list of blocks per datanode-descriptor was corrupted.<br />(Konstantin Shvachko via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1762">HADOOP-1762</a>. The Namenode fsimage does not contain a list of
+Datanodes.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1890">HADOOP-1890</a>. Removed debugging prints introduced by <a href="http://issues.apache.org/jira/browse/HADOOP-1774">HADOOP-1774</a>.<br />(Raghu Angadi via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1763">HADOOP-1763</a>. Too many lost task trackers on large clusters due to
+insufficient number of RPC handler threads on the JobTracker.<br />(Devaraj Das)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1463">HADOOP-1463</a>.  HDFS report correct usage statistics for disk space
+used by HDFS.<br />(Hairong Kuang via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1692">HADOOP-1692</a>.  In DFS ant task, don't cache the Configuration.<br />(Chris Douglas via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1726">HADOOP-1726</a>.  Remove lib/jetty-ext/ant.jar.<br />(omalley)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1772">HADOOP-1772</a>.  Fix hadoop-daemon.sh script to get correct hostname
+under Cygwin.  (Tsz Wo (Nicholas), SZE via cutting)
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1749">HADOOP-1749</a>.  Change TestDFSUpgrade to sort files, fixing sporadic
+test failures.<br />(Enis Soztutar via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1748">HADOOP-1748</a>.  Fix tasktracker to be able to launch tasks when log
+directory is relative.<br />(omalley via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1775">HADOOP-1775</a>.  Fix a NullPointerException and an
+IllegalArgumentException in MapWritable.<br />(Jim Kellerman via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1795">HADOOP-1795</a>.  Fix so that jobs can generate output file names with
+special characters.<br />(Fr??d??ric Bertin via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1810">HADOOP-1810</a>.  Fix incorrect value type in MRBench (SmallJobs)<br />(Devaraj Das via tomwhite)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1806">HADOOP-1806</a>.  Fix ant task to compile again, also fix default
+builds to compile ant tasks.<br />(Chris Douglas via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1758">HADOOP-1758</a>.  Fix escape processing in librecordio to not be
+quadratic.<br />(Vivek Ratan via cutting)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-1817">HADOOP-1817</a>.  Fix MultiFileSplit to read and write the split
+length, so that it is not always zero in map tasks.<br />(Thomas Friol via cutting)</li>

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