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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3613) UnknownHostException if the system can't determine its own name and you go DNS.getIPs("name-of-an-unknown-interface");
Date Fri, 20 Jun 2008 19:53:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-3613:
-----------------------------------

    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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