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     <h1 id="title">Releases Archive</h1>
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             <h1><a href="/release/2.0.0-alpha.html">Release 2.0.0-alpha available</a></h1>
             <p><small>2012 May 23 </small></p>

             <!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This is the first (alpha) version in the hadoop-2.x series.</p>
 <p>This delivers significant major features over the currently stable
 hadoop-1.x series including:</p>
 <ul>
 <li>HDFS HA for NameNode (manual failover)</li>
 <li>YARN aka NextGen MapReduce</li>
 <li>HDFS Federation</li>
 <li>Performance</li>
 <li>Wire-compatibility for both HDFS and YARN/MapReduce (using
 protobufs)</li>
 </ul>
 <p>Please see the <a href="https://hadoop.apache.org/docs/r2.0.0-alpha/hadoop-project-dist/hadoop-common/releasenotes.html">Hadoop 2.0.0-alpha Release
 Notes</a>
 for details.</p>


             <h1><a href="/release/1.0.3.html">Release 1.0.3 available</a></h1>
             <p><small>2012 May 16 </small></p>

             <!---
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   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

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   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This is a bug fix release for version 1.0.</p>
 <p>Bug fixes and feature enhancements in this minor release include:</p>
 <ul>
 <li>4 patches in support of non-Oracle JDKs</li>
 <li>several patches to clean up error handling and log messages</li>
 <li>various production issue fixes</li>
 </ul>
 <p>Please see the <a href="https://hadoop.apache.org/docs/r1.0.3/releasenotes.html">Hadoop 1.0.3 Release
 Notes</a> for
 details.</p>


             <h1><a href="/release/1.0.2.html">Release 1.0.2 available</a></h1>
             <p><small>2012 Apr 3 </small></p>

             <!---
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   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

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   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This is a bug fix release for version 1.0.</p>
 <p>Bug fixes and feature enhancements in this minor release include:</p>
 <ul>
 <li>Snappy compressor/decompressor is available</li>
 <li>Occassional deadlock in metrics serving thread fixed</li>
 <li>64-bit secure datanodes failed to start, now fixed</li>
 <li>Changed package names for 64-bit rpm/debs to use &ldquo;.x86_64.&rdquo; instead
 of &ldquo;.amd64.&rdquo;</li>
 </ul>
 <p>Please see the <a href="https://hadoop.apache.org/docs/r1.0.2/releasenotes.html">Hadoop 1.0.2 Release
 Notes</a> for
 details.</p>


             <h1><a href="/release/1.0.1.html">Release 1.0.1 available</a></h1>
             <p><small>2012 Mar 10 </small></p>

             <!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This is a bug fix release for version 1.0. This release is now
 considered stable, replacing the long-standing 0.20.203.</p>
 <p>Bug fixes in this minor release include:</p>
 <ul>
 <li>Added hadoop-client and hadoop-minicluster artifacts for ease of
 client install and testing</li>
 <li>Support run-as-user in non-secure mode</li>
 <li>Better compatibility with Ganglia, HBase, and Sqoop</li>
 </ul>
 <p>Please see the <a href="https://hadoop.apache.org/docs/r1.0.1/releasenotes.html">Hadoop 1.0.1 Release
 Notes</a> for
 details.</p>


             <h1><a href="/release/0.23.1.html">release 0.23.1 available</a></h1>
             <p><small>2012 Feb 27 </small></p>

             <!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This is the second alpha version of the hadoop-0.23 major release after
 the first alpha 0.23.0. This release has significant improvements
 compared to 0.23.0 but should still be considered as alpha-quality and
 not for production use.</p>
 <p>hadoop-0.23.1 contains several major advances from 0.23.0:</p>
 <ul>
 <li>Lots of bug fixes and improvements in both HDFS and MapReduce</li>
 <li>Major performance work to make this release either match or exceed
 performance of Hadoop-1 in most aspects of both HDFS and MapReduce.</li>
 <li>Several downstream projects like HBase, Pig, Oozie, Hive etc. are
 better integrated with this release</li>
 </ul>
 <p>See the <a href="https://hadoop.apache.org/docs/r0.23.1/hadoop-project-dist/hadoop-common/releasenotes.html">Hadoop 0.23.1 Release
 Notes</a>
 for details.</p>


             <h1><a href="/release/1.0.0.html">release 1.0.0 available</a></h1>
             <p><small>2011 Dec 27 </small></p>

             <!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>After six years of gestation, Hadoop reaches 1.0.0! This release is from
 the 0.20-security code line, and includes support for:</p>
 <ul>
 <li>security</li>
 <li>HBase (append/hsynch/hflush, and security)</li>
 <li>webhdfs (with full support for security)</li>
 <li>performance enhanced access to local files for HBase</li>
 <li>other performance enhancements, bug fixes, and features</li>
 </ul>
 <p>Please see the complete <a href="https://hadoop.apache.org/docs/r1.0.0/releasenotes.html">Hadoop 1.0.0 Release
 Notes</a> for
 details.</p>


             <h1><a href="/release/0.22.0.html">release 0.22.0 available</a></h1>
             <p><small>2011 Dec 10 </small></p>

             <!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This release contains many bug fixes and optimizations compared to its
 predecessor 0.21.0. See the <a href="https://hadoop.apache.org/docs/r0.22.0/releasenotes.html">Hadoop 0.22.0 Release
 Notes</a> for
 details. Alternatively, you can look at the complete <a href="https://hadoop.apache.org/docs/r0.22.0/changes.html">change log for
 this release</a></p>
 <p>Notes:</p>
 <p>The following features are not supported in Hadoop 0.22.0.</p>
 <ul>
 <li>Security.</li>
 <li>Latest optimizations of the MapReduce framework introduced in the
 Hadoop 0.20.security line of releases.</li>
 <li>Disk-fail-in-place.</li>
 <li>JMX-based metrics v2.</li>
 </ul>
 <p>Hadoop 0.22.0 features</p>
 <ul>
 <li>HBase support with <code>hflush</code> and <code>hsync</code>.</li>
 <li>New implementation of file append.</li>
 <li>Symbolic links.</li>
 <li>BackupNode and CheckpointNode.</li>
 <li>Hierarchical job queues.</li>
 <li>Job limits per queue/pool.</li>
 <li>Dynamically stop/start job queues.</li>
 <li>Andvances in new mapreduce API: Input/Output formats,
 ChainMapper/Reducer.</li>
 <li>TaskTracker blacklisting.</li>
 <li>DistributedCache sharing.</li>
 </ul>


             <h1><a href="/release/0.23.0.html">release 0.23.0 available</a></h1>
             <p><small>2011 Nov 11 </small></p>

             <!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This is the alpha version of the hadoop-0.23 major release. This is the
 first release we&rsquo;ve made off Apache Hadoop trunk in a long while. This
 release is alpha-quality and not yet ready for serious use.</p>
 <p>hadoop-0.23 contains several major advances:</p>
 <ul>
 <li>HDFS Federation</li>
 <li>NextGen MapReduce (YARN)</li>
 </ul>
 <p>It also has several major performance improvements to both HDFS and
 MapReduce.</p>
 <p>See the <a href="https://hadoop.apache.org/docs/r0.23.0/hadoop-project-dist/hadoop-common/releasenotes.html">Hadoop 0.23.0 Release
 Notes</a>
 for details.</p>


             <h1><a href="/release/0.20.205.0.html">release 0.20.205.0 available</a></h1>
             <p><small>2011 Oct 17 </small></p>

             <!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This release contains improvements, new features, bug fixes and
 optimizations. This release includes rpms and debs, all duly checksummed
 and securely signed.</p>
 <p>See the <a href="https://hadoop.apache.org/docs/r0.20.205.0/releasenotes.html">Hadoop 0.20.205.0 Release
 Notes</a> for
 details. Alternatively, you can look at the complete <a href="https://hadoop.apache.org/docs/r0.20.205.0/changes.html">change log for
 this release</a>.</p>
 <p>Notes:</p>
 <ul>
 <li>This release includes a merge of append/hsynch/hflush capabilities
 from 0.20-append branch, to support HBase in secure mode.</li>
 <li>This release includes the new webhdfs file system, but webhdfs write
 calls currently fail in secure mode.</li>
 </ul>


             <h1><a href="/release/0.20.204.0.html">release 0.20.204.0 available</a></h1>
             <p><small>2011 Sep 5 </small></p>

             <!---
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. See accompanying LICENSE file.
 -->
 <p>This release contains improvements, new features, bug fixes and
 optimizations. This release includes rpms and debs for the first time.</p>
 <p>See the <a href="https://hadoop.apache.org/docs/r0.20.204.0/releasenotes.html">Hadoop 0.20.204.0 Release
 Notes</a> for
 details. Alternatively, you can look at the complete <a href="https://hadoop.apache.org/docs/r0.20.204.0/changes.html">change log for
 this release</a>.</p>
 <p>Notes:</p>
 <ul>
 <li>The RPMs don&rsquo;t work with security turned on. (HADOOP-7599)</li>
 <li>The NameNode&rsquo;s edit log needs to be merged into the image via</li>
 <li>put the NameNode into safe mode</li>
 <li>run dfsadmin savenamespace command</li>
 <li>perform a normal upgrade</li>
 </ul>


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	<div>
	<h1 id="title">Releases Archive</h1>
	<ul id="list">

	<h1><a href="/release/2.0.0-alpha.html">Release 2.0.0-alpha available</a></h1>
	<p><small>2012 May 23 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This is the first (alpha) version in the hadoop-2.x series.</p>
	<p>This delivers significant major features over the currently stable
	hadoop-1.x series including:</p>
	<ul>
	<li>HDFS HA for NameNode (manual failover)</li>
	<li>YARN aka NextGen MapReduce</li>
	<li>HDFS Federation</li>
	<li>Performance</li>
	<li>Wire-compatibility for both HDFS and YARN/MapReduce (using
	protobufs)</li>
	</ul>
	<p>Please see the <a href="https://hadoop.apache.org/docs/r2.0.0-alpha/hadoop-project-dist/hadoop-common/releasenotes.html">Hadoop 2.0.0-alpha Release
	Notes</a>
	for details.</p>



	<h1><a href="/release/1.0.3.html">Release 1.0.3 available</a></h1>
	<p><small>2012 May 16 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This is a bug fix release for version 1.0.</p>
	<p>Bug fixes and feature enhancements in this minor release include:</p>
	<ul>
	<li>4 patches in support of non-Oracle JDKs</li>
	<li>several patches to clean up error handling and log messages</li>
	<li>various production issue fixes</li>
	</ul>
	<p>Please see the <a href="https://hadoop.apache.org/docs/r1.0.3/releasenotes.html">Hadoop 1.0.3 Release
	Notes</a> for
	details.</p>



	<h1><a href="/release/1.0.2.html">Release 1.0.2 available</a></h1>
	<p><small>2012 Apr 3 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This is a bug fix release for version 1.0.</p>
	<p>Bug fixes and feature enhancements in this minor release include:</p>
	<ul>
	<li>Snappy compressor/decompressor is available</li>
	<li>Occassional deadlock in metrics serving thread fixed</li>
	<li>64-bit secure datanodes failed to start, now fixed</li>
	<li>Changed package names for 64-bit rpm/debs to use “.x86_64.” instead
	of “.amd64.”</li>
	</ul>
	<p>Please see the <a href="https://hadoop.apache.org/docs/r1.0.2/releasenotes.html">Hadoop 1.0.2 Release
	Notes</a> for
	details.</p>



	<h1><a href="/release/1.0.1.html">Release 1.0.1 available</a></h1>
	<p><small>2012 Mar 10 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This is a bug fix release for version 1.0. This release is now
	considered stable, replacing the long-standing 0.20.203.</p>
	<p>Bug fixes in this minor release include:</p>
	<ul>
	<li>Added hadoop-client and hadoop-minicluster artifacts for ease of
	client install and testing</li>
	<li>Support run-as-user in non-secure mode</li>
	<li>Better compatibility with Ganglia, HBase, and Sqoop</li>
	</ul>
	<p>Please see the <a href="https://hadoop.apache.org/docs/r1.0.1/releasenotes.html">Hadoop 1.0.1 Release
	Notes</a> for
	details.</p>



	<h1><a href="/release/0.23.1.html">release 0.23.1 available</a></h1>
	<p><small>2012 Feb 27 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This is the second alpha version of the hadoop-0.23 major release after
	the first alpha 0.23.0. This release has significant improvements
	compared to 0.23.0 but should still be considered as alpha-quality and
	not for production use.</p>
	<p>hadoop-0.23.1 contains several major advances from 0.23.0:</p>
	<ul>
	<li>Lots of bug fixes and improvements in both HDFS and MapReduce</li>
	<li>Major performance work to make this release either match or exceed
	performance of Hadoop-1 in most aspects of both HDFS and MapReduce.</li>
	<li>Several downstream projects like HBase, Pig, Oozie, Hive etc. are
	better integrated with this release</li>
	</ul>
	<p>See the <a href="https://hadoop.apache.org/docs/r0.23.1/hadoop-project-dist/hadoop-common/releasenotes.html">Hadoop 0.23.1 Release
	Notes</a>
	for details.</p>



	<h1><a href="/release/1.0.0.html">release 1.0.0 available</a></h1>
	<p><small>2011 Dec 27 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>After six years of gestation, Hadoop reaches 1.0.0! This release is from
	the 0.20-security code line, and includes support for:</p>
	<ul>
	<li>security</li>
	<li>HBase (append/hsynch/hflush, and security)</li>
	<li>webhdfs (with full support for security)</li>
	<li>performance enhanced access to local files for HBase</li>
	<li>other performance enhancements, bug fixes, and features</li>
	</ul>
	<p>Please see the complete <a href="https://hadoop.apache.org/docs/r1.0.0/releasenotes.html">Hadoop 1.0.0 Release
	Notes</a> for
	details.</p>



	<h1><a href="/release/0.22.0.html">release 0.22.0 available</a></h1>
	<p><small>2011 Dec 10 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This release contains many bug fixes and optimizations compared to its
	predecessor 0.21.0. See the <a href="https://hadoop.apache.org/docs/r0.22.0/releasenotes.html">Hadoop 0.22.0 Release
	Notes</a> for
	details. Alternatively, you can look at the complete <a href="https://hadoop.apache.org/docs/r0.22.0/changes.html">change log for
	this release</a></p>
	<p>Notes:</p>
	<p>The following features are not supported in Hadoop 0.22.0.</p>
	<ul>
	<li>Security.</li>
	<li>Latest optimizations of the MapReduce framework introduced in the
	Hadoop 0.20.security line of releases.</li>
	<li>Disk-fail-in-place.</li>
	<li>JMX-based metrics v2.</li>
	</ul>
	<p>Hadoop 0.22.0 features</p>
	<ul>
	<li>HBase support with <code>hflush</code> and <code>hsync</code>.</li>
	<li>New implementation of file append.</li>
	<li>Symbolic links.</li>
	<li>BackupNode and CheckpointNode.</li>
	<li>Hierarchical job queues.</li>
	<li>Job limits per queue/pool.</li>
	<li>Dynamically stop/start job queues.</li>
	<li>Andvances in new mapreduce API: Input/Output formats,
	ChainMapper/Reducer.</li>
	<li>TaskTracker blacklisting.</li>
	<li>DistributedCache sharing.</li>
	</ul>



	<h1><a href="/release/0.23.0.html">release 0.23.0 available</a></h1>
	<p><small>2011 Nov 11 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This is the alpha version of the hadoop-0.23 major release. This is the
	first release we’ve made off Apache Hadoop trunk in a long while. This
	release is alpha-quality and not yet ready for serious use.</p>
	<p>hadoop-0.23 contains several major advances:</p>
	<ul>
	<li>HDFS Federation</li>
	<li>NextGen MapReduce (YARN)</li>
	</ul>
	<p>It also has several major performance improvements to both HDFS and
	MapReduce.</p>
	<p>See the <a href="https://hadoop.apache.org/docs/r0.23.0/hadoop-project-dist/hadoop-common/releasenotes.html">Hadoop 0.23.0 Release
	Notes</a>
	for details.</p>



	<h1><a href="/release/0.20.205.0.html">release 0.20.205.0 available</a></h1>
	<p><small>2011 Oct 17 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This release contains improvements, new features, bug fixes and
	optimizations. This release includes rpms and debs, all duly checksummed
	and securely signed.</p>
	<p>See the <a href="https://hadoop.apache.org/docs/r0.20.205.0/releasenotes.html">Hadoop 0.20.205.0 Release
	Notes</a> for
	details. Alternatively, you can look at the complete <a href="https://hadoop.apache.org/docs/r0.20.205.0/changes.html">change log for
	this release</a>.</p>
	<p>Notes:</p>
	<ul>
	<li>This release includes a merge of append/hsynch/hflush capabilities
	from 0.20-append branch, to support HBase in secure mode.</li>
	<li>This release includes the new webhdfs file system, but webhdfs write
	calls currently fail in secure mode.</li>
	</ul>



	<h1><a href="/release/0.20.204.0.html">release 0.20.204.0 available</a></h1>
	<p><small>2011 Sep 5 </small></p>

	<!---
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License. See accompanying LICENSE file.
	-->
	<p>This release contains improvements, new features, bug fixes and
	optimizations. This release includes rpms and debs for the first time.</p>
	<p>See the <a href="https://hadoop.apache.org/docs/r0.20.204.0/releasenotes.html">Hadoop 0.20.204.0 Release
	Notes</a> for
	details. Alternatively, you can look at the complete <a href="https://hadoop.apache.org/docs/r0.20.204.0/changes.html">change log for
	this release</a>.</p>
	<p>Notes:</p>
	<ul>
	<li>The RPMs don’t work with security turned on. (HADOOP-7599)</li>
	<li>The NameNode’s edit log needs to be merged into the image via</li>
	<li>put the NameNode into safe mode</li>
	<li>run dfsadmin savenamespace command</li>
	<li>perform a normal upgrade</li>
	</ul>



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