NPE if the system can't determine its own name and you go
DNS.getDefaultHost(null)
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Key: HADOOP-3612
URL: https://issues.apache.org/jira/browse/HADOOP-3612
Project: Hadoop Core
Issue Type: Bug
Affects Versions: 0.18.0
Reporter: Steve Loughran
Assignee: Steve Loughran
Priority: Minor
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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