Steve Loughran created HADOOP-13172:
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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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