dfs.replication 2 dfs.datanode.data.dir file:///data/dfs/data dfs.namenode.name.dir file:///data/dfs/name dfs.namenode.checkpoint.dir file:///data/dfs/namesecondary dfs.namenode.datanode.registration.ip-hostname-check false dfs.default.replica 1 dfs.support.append true dfs.client.block.write.replace-datanode-on-failure.enable false