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  1. Hadoop HDFS
  2. HDFS-15785

Datanode to support using DNS to resolve nameservices to IP addresses to get list of namenodes

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      Currently as HDFS supports observers, multiple-standby and router, the namenode hosts are changing frequently in large deployment, we can consider supporting https://issues.apache.org/jira/browse/HDFS-14118 on datanode to reduce the need to update config frequently on all datanodes. In that case, datanode and clients can use the same set of config as well.

      Basically we can resolve the DNS and generate namenode for each IP behind it.

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            LeonG Leon Gao
            LeonG Leon Gao
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