To minimize global bandwidth consumption and read latency, HDFS tries to satisfy a read request from a replica that is closest to the reader.
副本的选择，为了降低整体的带宽消耗和读延时，HDFS会尽量让reader读最近的副本。
To minimize global bandwidth consumption and read latency, HDFS tries to satisfy a read request from a replica that is closest to the reader.
副本的选择，为了降低整体的带宽消耗和读延时，HDFS会尽量让reader读最近的副本。
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