Hadoop 2.x 联邦配置
dfs.nameservices
ns1,ns2
dfs.namenode.rpc-address.ns1
snn-host1:rpc-port
dfs.namenode.http-address.ns1
snn-host2:http-port
dfs.namenode.secondaryhttp-address.ns1
snn-host1:http-port
dfs.namenode.rpc-address.ns2
snn-host2:rpc-port
dfs.namenode.http-address.ns2
snn-host2:http-port
dfs.namenode.secondaryhttp-address.ns2
snn-host2:http-port
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