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  1. Hadoop Common
  2. HADOOP-8156

Remove ability to specify a custom nameserver for an interface in DNS.java


    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: conf
    • Labels:
    • Hadoop Flags:
      Incompatible change


      A long time ago HADOOP-497 introduced the option to specify a specific nameserver to use when looking up the hostname of an interface specified in the config (eg by dfs.datanode.dns.interface). This feature is not in MR2, and I dont't think it makes sense for HDFS since HDFS stopped advertising DNs by hostname a long time ago (HADOOP-985). Also per HADOOP-8134 and HBASE-4109, I don't think this feature works, as it returns the PTR record verbatim instead of the hostname (eg PTR record may have a trailing ".", ".lan" etc that may not resolve).

      How about we remove this feature from trunk and 23? We can deprecate in 1.0, though I doubt anyone is using it. This is an incompatible change. DNS is annotated LimitedPrivate and Unstable but HBase uses it so will file need to file a jira there (they use this via HBASE-1279 and HBASE-1279).


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              • Assignee:
                eli Eli Collins
                eli2 Eli Collins
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