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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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