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https://issues.apache.org/jira/browse/HADOOP-13172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-13172.
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Resolution: Won't Fix
> 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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