1.机架感知说明
For the common case, when the replication factor is three,
HDFS’s placement policy is to put one replica on the local machine if the writer is on a datanode,
otherwise on a random datanode, another replica on a node in a different (remote) rack,
and the last on a different node in the same remote rack.
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Hadoop3.1.3副本节点选择
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