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  1. Hadoop HDFS
  2. HDFS-95

UnknownHostException if the system can't determine its own name and you go DNS.getIPs("name-of-an-unknown-interface");

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.21.0
    • Component/s: None
    • Labels:
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      Description

      If you give an interface that doesnt exist, DNS.getIPs falls back to
      InetAddress.getLocalHost().getHostAddress()

      But there's an assumption there: that InetAddress.getLocalHost(). is valid. If it doesnt resolve properly, you get an UnknownHostException

      java.net.UnknownHostException: k2: k2
      at java.net.InetAddress.getLocalHost(InetAddress.java:1353)
      at org.apache.hadoop.net.DNS.getIPs(DNS.java:96)
      at org.apache.hadoop.net.TestDNS.testIPsOfUnknownInterface(TestDNS.java:73)

      It is possible to catch this and return something else. The big question: what to fall back to? 127.0.0.1 would be an obvious choice

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              • Assignee:
                stevel@apache.org Steve Loughran
                Reporter:
                stevel@apache.org Steve Loughran
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                • Created:
                  Updated:
                  Resolved: