注意，“DONE” 消息被通过数据流从每个后台线程发送到结果侦听程序。
Notice the "DONE" message being sent from each background thread through the stream to the results listener.
它的关键特性是一个非常快的算法，它只通过数据链路发送文件差异，因此把机器之间传输的数据总量降低到最低限度。
Its key feature is a very fast algorithm that just sends file differences over the data link, thus minimizing the total data flow between machines.
联邦服务器通过数据源本地 SQL 方言中的 SQL 语句将对数据的远程请求发送到远程关系数据源。
The federated server communicates a remote request for data to the remote relational data source through an SQL statement in the native SQL dialect of the data source.
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