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Steve Loughran commented on HADOOP-12726:
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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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