DNS#getIPs shouldn't silently return the local host IP for bogus interface names
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Key: HADOOP-8154
URL: https://issues.apache.org/jira/browse/HADOOP-8154
Project: Hadoop Common
Issue Type: Bug
Components: conf
Reporter: Eli Collins
Assignee: Eli Collins
DNS#getIPs silently returns the local host IP for bogus interface names. In
this case let's throw an UnknownHostException. This is technically an
incompatbile change. I suspect the current behavior was origininally introduced
so the interface name "default" works w/o explicitly checking for it. It may
also be used in cases where someone is using a shared config file and an option
like "dfs.datanode.dns.interface" or "hbase.master.dns.interface" and eg
interface "eth3" that some hosts don't have, though I think silently ignorning
this is the wrong behavior (those hosts should be configured to use a different
interface).
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