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-<input value="hadoop.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">
-<input value="hadoop.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">
-<input value="hadoop.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">
-<span class="codefrag">使用方法:hadoop fs -chgrp [-R] GROUP URI [URI …]</span>
- Change group association of files. With <span class="codefrag">-R</span>, make the change recursively through the directory structure. The user must be the owner of files, or else a super-user. Additional information is in the <a href="hdfs_permissions_guide.html">Permissions User Guide</a>.
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-<input value="hadoop.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">
-<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>Hadoop On Demand (HOD)是一个能在一个共享集群上供应和管理相互独立的Hadoop Map/Reduce和Hadoop分布式文件系统(HDFS)实例的系统。它能让管理员和用户轻松地快速搭建和使用hadoop。HOD对Hadoop的开发人员和测试人员也非常有用,他们可以通过HOD共享一个物理集群来测试各自不同的Hadoop版本。</p>
-<input value="hadoop.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">
-<input value="hadoop.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">
-<a href="#Hadoop%E4%BD%9C%E4%B8%9A%E5%A4%B1%E8%B4%A5%E5%B9%B6%E8%BF%94%E5%9B%9E%E6%B6%88%E6%81%AF%EF%BC%9A%E2%80%98Job+tracker+still+initializing%E2%80%99">Hadoop作业失败并返回消息:‘Job tracker still initializing’</a>
-<p>Hadoop On Demand (HOD)是一个能在大规模物理集群上供应虚拟Hadoop集群的系统。它使用Torque资源管理器进行节点分配。在所分配的节点上,它能启动Hadoop Map/Reduce以及HDFS守护进程。它能自动为Hadoop守护进程及客户端生成合适的配置文件(Hadoop-site.xml)。HOD还能够将Hadoop分发到它分配的虚拟集群节点上。总之,HOD方便管理者和用户快速安装与使用Hadoop。它也是需要在同一物理集群上测试各自版本的Hadoop开发者和测试者的实用工具。</p>
- 允许的操作有‘allocate’,‘deallocate’,‘info’,‘list’,‘script’以及‘help’。要获取某特定操作的帮助你可以执行:<span class="codefrag">hod help <operation></span>。要查看可能的操作你可以执行<span class="codefrag">hod help options</span>。</p>
- <td colspan="1" rowspan="1"> HOD会打印信息"Cluster could not be allocated because of the following errors on the ringmaster host <hostname>"。实际的错误信息可能指示下列情形中的一种:<br>
- <td colspan="1" rowspan="1"> 当HOD由于DFS故障(或者Job tracker失败,错误码8,下文有介绍)分配失败时,它会打印错误信息 "Hodring at <hostname> failed with following errors:",并给出真正的错误信息,这个信息可能表明下列情形中的一种:<br>
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