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| <h1>Release 2.2.0 available</h1> |
| <!--- |
| 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 |
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| http://www.apache.org/licenses/LICENSE-2.0 |
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| 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>Apache Hadoop 2.2.0 is the <strong>GA</strong> release of Apache Hadoop 2.x.</p> |
| <p>Users are encouraged to immediately move to 2.2.0 since this release is |
| significantly more stable and is guaranteed to remain compatible in |
| terms of both APIs and protocols.</p> |
| <p>To recap, this release has a number of significant highlights compared |
| to Hadoop 1.x:</p> |
| <ul> |
| <li>YARN - A general purpose resource management system for Hadoop to |
| allow MapReduce and other other data processing frameworks and |
| services</li> |
| <li>High Availability for HDFS</li> |
| <li>HDFS Federation</li> |
| <li>HDFS Snapshots</li> |
| <li>NFSv3 access to data in HDFS</li> |
| <li>Support for running Hadoop on Microsoft Windows</li> |
| <li>Binary Compatibility for MapReduce applications built on hadoop-1.x</li> |
| <li>Substantial amount of integration testing with rest of projects in |
| the ecosystem</li> |
| </ul> |
| <p>A couple of important points to note while upgrading to hadoop-2.2.0:</p> |
| <ul> |
| <li>HDFS - The HDFS community decided to push the symlinks feature out |
| to a future 2.3.0 release and is currently disabled.</li> |
| <li>YARN/MapReduce - Users need to change ShuffleHandler service name |
| from mapreduce.shuffle to mapreduce_shuffle.</li> |
| </ul> |
| <p>Please see the <a href="https://hadoop.apache.org/docs/r2.2.0/hadoop-project-dist/hadoop-common/releasenotes.html">Hadoop 2.2.0 Release |
| Notes</a> |
| for details.</p> |
| |
| <small>2013 Oct 15 </small> |
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