[DNS] Log a WARN when there's no matching interface and we are gonna use the
default one.
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Key: HADOOP-7830
URL: https://issues.apache.org/jira/browse/HADOOP-7830
Project: Hadoop Common
Issue Type: Sub-task
Affects Versions: 0.24.0
Reporter: Harsh J
Fix For: 0.24.0
We do not currently log today when a requested interface is not found. Instead
the code handles this by using the default interface instead, when the lookup
result is null.
We should log a WARN when this is done, instead of letting it sneak by.
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