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<h1> 
      Hadoop On Demand
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<p>Hadoop On Demand(HOD)是一个能在大型物理集群上供应虚拟hadoop集群的系统。它使用Torque资源管理器分配节点。它可以在分配的节点上启动Hadoop Map/Reduce和HDFS的守护进程。它会自动为Hadoop守护进程和客户端生成合适的配置文件（hadoop-site.xml）。HOD还可以将Hadoop分发到它分配出来的虚拟Hadoop集群的节点上。简而言之，HOD使管理员和用户轻松地快速搭建和使用hadoop。它也是Hadoop开发人员和测试人员非常有用的一个工具，他们可以使用HOD共享一个物理集群来测试各自的Hadoop版本。</p>
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<p>读一遍下面的文档，你会在使用HOD方面了解更多</p>
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<a href="hod_admin_guide.html">HOD管理指南</a> : 此指南概述了HOD的体系结构，Torque资源管理器及其他各种支持工具，也会告诉你如何安装，配置和运行HOD。</li>
        
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<a href="hod_config_guide.html">HOD配置指南</a> : 此指南讨论HOD的配置段，会告诉你如何使用那些最重要和最常用的配置项。</li>
        
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<a href="hod_user_guide.html">HOD用户指南</a> : 此指南会告诉你如何开始使用HOD，它的各种功能特性，命令行选项，也会给你一些故障解决方面的详细帮助。</li>
      
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