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名字空间配额管理指南
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<h1>
名字空间配额管理指南
</h1>
<p>
Hadoop分布式文件系统(HDFS)允许管理员为每个目录设置配额。
新建立的目录没有配额。
最大的配额是<span class="codefrag">Long.Max_Value</span>。配额为1可以强制目录保持为空。
</p>
<p>
目录配额是对目录树上该目录下的名字数量做硬性限制。如果创建文件或目录时超过了配额，该操作会失败。重命名不会改变该目录的配额；如果重命名操作会导致违反配额限制，该操作将会失败。如果尝试设置一个配额而现有文件数量已经超出了这个新配额，则设置失败。
</p>
<p>
配额和fsimage保持一致。当启动时，如果fsimage违反了某个配额限制（也许fsimage被偷偷改变了），则启动失败并生成错误报告。设置或删除一个配额会创建相应的日志记录。
</p>
<p>
下面的新命令或新选项是用于支持配额的。
前两个是管理员命令。
</p>
<ul>
<li>
<span class="codefrag">dfsadmin -setquota &lt;N&gt; &lt;directory&gt;...&lt;directory&gt;</span>
<br>
把每个目录配额设为<span class="codefrag">N</span>。这个命令会在每个目录上尝试，
如果<span class="codefrag">N</span>不是一个正的长整型数，目录不存在或是文件名，
或者目录超过配额，则会产生错误报告。
</li>
<li>
<span class="codefrag">dfsadmin -clrquota &lt;directory&gt;...&lt;director&gt;</span>
<br>
为每个目录删除配额。这个命令会在每个目录上尝试，如果目录不存在或者是文件，则会产生错误报告。如果目录原来没有设置配额不会报错。
</li>
<li>
<span class="codefrag">fs -count -q &lt;directory&gt;...&lt;directory&gt;</span>
<br>
使用<span class="codefrag">-q</span>选项，会报告每个目录设置的配额，以及剩余配额。
如果目录没有设置配额，会报告<span class="codefrag">none</span>和<span class="codefrag">inf</span>。
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