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https://issues.apache.org/jira/browse/HADOOP-12726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15117344#comment-15117344
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Steve Loughran commented on HADOOP-12726:
-----------------------------------------
This wont be incompatible, provided the exception is an IOE. If you use
java.lang.UnsupportedOperationException, things would break, so your patch
wouldn't get in
> Unsupported operations should throw UnsupportedOperationException
> -----------------------------------------------------------------
>
> Key: HADOOP-12726
> URL: https://issues.apache.org/jira/browse/HADOOP-12726
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Affects Versions: 2.7.1
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
>
> In the {{FileSystem}} implementation classes, unsupported operations throw
> {{new IOException("Not supported")}}, which makes it needlessly difficult to
> distinguish an actual error from an unsupported operation. They should
> instead throw {{new UnsupportedOperationException()}}.
> It's possible that this anti-idiom is used elsewhere in the code base. This
> JIRA should include finding and cleaning up those instances as well.
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