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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13172) And an UnsupportedFeatureException for Filesystems to throw on unsupported operations
Date Wed, 18 May 2016 13:53:12 GMT
Steve Loughran created HADOOP-13172:
---------------------------------------

             Summary: And an UnsupportedFeatureException for Filesystems to throw on unsupported
operations
                 Key: HADOOP-13172
                 URL: https://issues.apache.org/jira/browse/HADOOP-13172
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs
    Affects Versions: 2.8.0
            Reporter: Steve Loughran
            Priority: Minor


Filesystems which don't support things like append() tend to throw a simple IOE, which makes
it hard to distinguish "append didn't work for some IO problem" and "append isn't implemented".

If we add a new exception, {{UnsupportedFeatureException}}, make it the strict failure mode
of such operations if not supported and patch all our filesystems to raise it, then at least
code has a straightforward check. Same for any other unimplemented feature



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