[HADOOP-8154] DNS#getIPs shouldn't silently return the local host IP for bogus interface names

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.1.0, 2.0.0-alpha
• Component/s: conf
• Hadoop Flags: Incompatible change, Reviewed
• Assignee: Eli Collins
• Reporter: Eli Collins
• Created: 08/Mar/12 20:07
• Updated: 15/Apr/15 21:26
• Resolved: 23/Mar/12 03:24

Description

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).