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Global Replica Indices 全局副本索引
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.
为了最大限度地减少全局带宽消耗和读取延迟，HDFS试图让读取者的读取需求离副本最近。
All conflicts are recorded and resolved at the hub (global) replica.
所有冲突都在中心(全局)副本中记录和解决。
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