Jason Lowe created HADOOP-12125:
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             Summary: Retrying UnknownHostException on a proxy does not 
actually retry hostname resolution
                 Key: HADOOP-12125
                 URL: https://issues.apache.org/jira/browse/HADOOP-12125
             Project: Hadoop Common
          Issue Type: Bug
          Components: ipc
            Reporter: Jason Lowe


When RetryInvocationHandler attempts to retry an UnknownHostException the 
hostname fails to be resolved again.  The InetSocketAddress in the ConnectionId 
has cached the fact that the hostname is unresolvable, and when the proxy tries 
to setup a new Connection object with that ConnectionId it checks if the 
(cached) resolution result is unresolved and immediately throws.

The end result is we sleep and retry for no benefit.  The hostname resolution 
is never attempted again.



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