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| <h1>release 0.22.0 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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| 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> |
| |
| <small>2011 Dec 10 </small> |
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