A module was implemented to balance the disk space usage on a Hadoop Distributed File System cluster when some data nodes became full or when new empty nodes joined the cluster.

在某些数据节点已满或者新的空节点加入集群时，实现一个模块来平衡Hadoop分布式文件系统集群上的磁盘空间使用情况。

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We set the values of their text nodes to the empty string and 0, respectively.

我们将其文本节点的值分别设为空字符串和0。

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For example, if you create two empty element nodes named "foo" without any attributes, they are equal, even though they are not identical.

例如，如果创建了两个没有任何属性的、名为“foo”的空元素节点，那么它们是相等的，但是它们不是相同的。

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Some view MOOCs as a means to broaden access to education, while others see them as empty nodes lacking in meaningful engagement between faculty and students.

FORBES: The Changes We See: A Survey of College Presidents