为了便于说明，假设传感器网络读取EPC数据。
For the description, assume that the sensor network reads EPC data.
正在通过网络读取数据时发生了错误，请重新尝试。
An error condition occurred while reading data from the network. Please retry your request.
数据分布：客户端机器一般都不是数据节点，所有的数据访问都是远程的，必须通过网络读取。
Data locality: the client machine typically is not a data node. Allthe data accessed is remote and has to be read via the network.
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