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  1. Hadoop Common
  2. HADOOP-10011

NPE if the system can't determine its own name and you go DNS.getDefaultHost(null)

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Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Implemented
    • 2.1.1-beta, 3.0.0-alpha1
    • 2.2.0
    • None
    • None
    • Looking at the source this has been fixed: checks for null trigger {{UnknownHostException}}

    Description

      In a test case that I am newly writing, on my infamous "home machine with broken DNS", I cant call getByName(null) without seeing a stack trace:
      Testcase: testNullInterface took 0.014 sec
      Caused an ERROR
      null
      java.lang.NullPointerException
      at java.net.NetworkInterface.getByName(NetworkInterface.java:226)
      at org.apache.hadoop.net.DNS.getIPs(DNS.java:94)
      at org.apache.hadoop.net.DNS.getHosts(DNS.java:141)
      at org.apache.hadoop.net.DNS.getDefaultHost(DNS.java:218)
      at org.apache.hadoop.net.DNS.getDefaultHost(DNS.java:235)
      at org.apache.hadoop.net.TestDNS.testNullInterface(TestDNS.java:62)

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            stevel@apache.org Steve Loughran
            stevel@apache.org Steve Loughran
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              Updated:
              Resolved:

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