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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3619) DNS.getHosts triggers an ArrayIndexOutOfBoundsException in reverseDNS if one of the interfaces is IPv6
Date Mon, 23 Jun 2008 15:36:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607261#action_12607261
] 

Steve Loughran commented on HADOOP-3619:
----------------------------------------

The stack trace 
Testcase: testGetDefaultHostFromDefaultInterface took 0.008 sec
	Caused an ERROR
3
java.lang.ArrayIndexOutOfBoundsException: 3
	at org.apache.hadoop.net.DNS.reverseDns(DNS.java:66)
	at org.apache.hadoop.net.DNS.getHosts(DNS.java:153)
	at org.apache.hadoop.net.DNS.getDefaultHost(DNS.java:254)
	at org.apache.hadoop.net.DNS.getDefaultHost(DNS.java:272)
	at org.apache.hadoop.net.DNS.getDefaultHost(DNS.java:251)
	at org.apache.hadoop.net.TestDNS.testGetDefaultHostFromDefaultInterface(TestDNS.java:153)

This was raised when examining eth0, which is:
eth0      Link encap:Ethernet  HWaddr 00:1C:C4:17:CC:46  
          inet addr:16.25.171.118  Bcast:16.25.171.255  Mask:255.255.252.0
          inet6 addr: fe80::21c:c4ff:fe17:cc46/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1




> DNS.getHosts triggers an ArrayIndexOutOfBoundsException in reverseDNS if one of the interfaces
is IPv6
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3619
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3619
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Steve Loughran
>
> reverseDNS tries to split a host address string by ".", and so fails if ":" is the separator,
as it is in IPv6. When it tries to access the parts of the address, a stack trace is seen.

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