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https://issues.apache.org/jira/browse/HADOOP-3613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-3613:
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Summary: UnknownHostException if the system can't determine its own name
and you go DNS.getIPs("name-of-an-unknown-interface"); (was: NPE if the system
can't determine its own name and you go
DNS.getIPs("name-of-an-unknown-interface");)
fixing title
> UnknownHostException if the system can't determine its own name and you go
> DNS.getIPs("name-of-an-unknown-interface");
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-3613
> URL: https://issues.apache.org/jira/browse/HADOOP-3613
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Steve Loughran
>
> 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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