DNS#getHosts() fallback leads to mix of network-interface addresse in case
reverse lookup fails
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Key: HADOOP-6797
URL: https://issues.apache.org/jira/browse/HADOOP-6797
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 0.20.2
Reporter: Johannes Zillmann
org.apache.hadoop.net.DNS#getHosts():
{noformat}
public static String[] getHosts(String strInterface, String nameserver)
throws UnknownHostException {
String[] ips = getIPs(strInterface);
Vector<String> hosts = new Vector<String>();
for (int ctr = 0; ctr < ips.length; ctr++)
try {
hosts.add(reverseDns(InetAddress.getByName(ips[ctr]),
nameserver));
} catch (Exception e) {
}
if (hosts.size() == 0)
return new String[] { InetAddress.getLocalHost().getCanonicalHostName() };
else
return hosts.toArray(new String[] {});
}
{noformat}
I have the situation where i choosing eth1 as network interface
(fs.datanode.dns.interface and mapred.tasktracker.dns.interface) which is the
internal interface.
The reverse lookup fails for eth1 so the fallback:
{noformat}
if (hosts.size() == 0)
return new String[] { InetAddress.getLocalHost().getCanonicalHostName() };
{noformat}
comes to action. The dns of eth0 is returned which is the external interface.
This leads in my case to a combination of internal ip and external dns as the
default ip/host.
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