add retry logic to NetUtils.createSocketAddr() when hostname resolution fails
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Key: HADOOP-6679
URL: https://issues.apache.org/jira/browse/HADOOP-6679
Project: Hadoop Common
Issue Type: Improvement
Affects Versions: 0.20.0
Reporter: sam rash
Priority: Minor
transient DNS errors can cause the InetSocketAddress created in
NetUtils.createSocketAddr() to be unresolved when the hostname is resolvable.
Add a single retry after a short sleep using a simple InetSocketAddressFactory
class
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