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20.5.2. 分页文件
在将消息存储在多个文件的文件系统里，每个地址都对应一个单独的文件夹。这些保存消息的文件被称为分页文件（Page file）。每个文件包含最多为指定大小（
page-size-bytes）的消息。
系统按需要浏览分页文件，只要分页里的所有消息都被客户接收，它会尽快删除分页文件。
带有选择器（Selector）的消费者也将浏览分页文件，但它会忽略不符合条件的消息。
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