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https://issues.apache.org/jira/browse/HADOOP-12125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682187#comment-16682187
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Igor Dvorzhak commented on HADOOP-12125:
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[~jzhuge] May you share a patch with the fix that your colleague has?
> 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
> Assignee: John Zhuge
> Priority: Major
>
> 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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