The slave servers then use rsync to copy only those files in the Lucene index that have been changed.
之后，从服务器使用rsync来只复制Lucene索引中的那些已被更改的文件。
Even further, rsync will use a similar algorithm on individual files and only copy the portions of the file that have changed.
另外，rsync对各个文件使用相似的算法，只复制文件中修改过的部分。
Sometimes, you only need to copy the files that have changed since the last time you performed a copy, essentially synchronization rather than a complete re-copy.
有时，您只需要复制那些在上次复制操作之后进行过更改的文件，从本质上说是进行同步，而不是彻底的再次复制。
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