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https://issues.apache.org/jira/browse/HADOOP-12052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14574158#comment-14574158
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Brahma Reddy Battula commented on HADOOP-12052:
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Thanks [~ste...@apache.org] and [~varun_saxena] for reviewing the patch..
> IPC client downgrades all exception types to IOE, breaks callers trying to
> use them
> -----------------------------------------------------------------------------------
>
> Key: HADOOP-12052
> URL: https://issues.apache.org/jira/browse/HADOOP-12052
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Steve Loughran
> Assignee: Brahma Reddy Battula
> Priority: Critical
> Attachments: HADOOP-12052.patch
>
>
> The HADOOP-11772 cache changes mean that an exception such as
> {{UnknownHostException}} being raised on a Client connect is now being
> returned as a simple {{IOException}}, wrapping an {{ExecutionException}},
> with the real exception being hidden inside that.
> This breaks any application which uses the exception class in a try/catch
> statement so as to choose different actions depending on the failure mode.
> This has surfaced in the SLIDER-896 tests, but is likely to happen in
> production too.
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