Apache Accumulo v1.7.2 发布，一个高性能的Key-Value 存储

   <p style="text-align:center"><img alt="" src="https://simg.open-open.com/show/0d54d6addccec9a212a42c410d290498.png" /></p>    <p>Apache Accumulo 是一个有序的分布式Key-Value存储，提供了强大的，可扩展的数据存储和检索。 Apache Accumulo是一个基于谷歌Big Table、采用键值的分布式数据存储。这个开源选项是由美国国家安全局开发，并于2011年发布的。Accumulo是一个可在Hadoop环境中运行的Apache项目，它具有Big Table中所没有的功能，其中被包括了基于单元的访问控制。</p>    <p style="text-align:center"><strong>体系结构</strong></p>    <p style="text-align:center"><img alt="" src="https://simg.open-open.com/show/7cf2c9bf8448712cbc22142cb5c65ccc.jpg" /></p>    <h2>更新日志</h2>    <ul>     <li>Write-Ahead Logs can be prematurely deleted</li>     <li>Upgrade to Commons-VFS 2.1</li>     <li>Native Map failed to increment mutation count properly</li>     <li>Open WAL files could prevent DataNode decomission</li>     <li>Remove unnecessary copy of cached RFile index blocks</li>     <li>Analyze Key-length to avoid choosing large Keys for RFile Index blocks</li>     <li>Minor performance improvements.</li>     <li><a href="/misc/goto?guid=4958991686087993548">ACCUMULO-3923</a> bootstrap_hdfs.sh script would copy incorrect jars to hdfs.</li>     <li><a href="/misc/goto?guid=4958991686186614621">ACCUMULO-4146</a> Avoid copy of RFile Index Blocks when already in cache.</li>     <li><a href="/misc/goto?guid=4958991686280926971">ACCUMULO-4155</a> No longer publish javadoc for non-public API to website. (Still available in javadoc jars in maven)</li>     <li><a href="/misc/goto?guid=4958991686366825096">ACCUMULO-4173</a> Provide balancer to balance table within subset of hosts.</li>     <li><a href="/misc/goto?guid=4958991686461094212">ACCUMULO-4334</a> Ingest rates reported through JMX did not match rates reported by Monitor.</li>     <li><a href="/misc/goto?guid=4958991686559189670">ACCUMULO-4335</a> Error conditions that result in a Halt should ensure non-zero process exit code.</li>     <li>详见：<a href="/misc/goto?guid=4958991686636134573">release_notes</a></li>    </ul>    <h2>下载</h2>    <table>     <tbody>      <tr>       <td><strong>Generic Binaries</strong></td>       <td><a href="/misc/goto?guid=4958991686732047980" id="/downloads/accumulo-1.7.2-bin.tar.gz">accumulo-1.7.2-bin.tar.gz</a></td>       <td><a href="/misc/goto?guid=4958991686827491636">ASC</a></td>      </tr>      <tr>       <td><strong>Source</strong></td>       <td><a href="/misc/goto?guid=4958991686912833254" id="/downloads/accumulo-1.7.2-src.tar.gz">accumulo-1.7.2-src.tar.gz</a></td>       <td><a href="/misc/goto?guid=4958991687010916100">ASC</a></td>      </tr>     </tbody>    </table>    <p> </p>