Move dnsToSwitchMapping and hostsReader from FSNamesystem to DatanodeManager ----------------------------------------------------------------------------
Key: HDFS-2167
URL: https://issues.apache.org/jira/browse/HDFS-2167
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
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