RXP通过为所要解析的XML文档构建一个紧凑的内存树结构而工作。

RXP works by building a compact in-memory tree structure of the XML document being parsed.

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当经常需要大量数据时，您所能做到的只是尽可能完美地管理内存，或者压缩数据或采用其他方式使其尽可能紧凑。

When a large amount of data is required on an ongoing basis, the most you can do is manage memory as best you can, or perhaps compress or otherwise keep it as compact as possible.

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这个关键的元数据设计得很紧凑，因而一个带有4 G内存的Namenode足够支撑海量的文件和目录。

This key metadata item is designed to be compact, such that a NameNode with 4 GB of RAM is plenty to support a huge number of files and directories.

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