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https://issues.apache.org/jira/browse/HADOOP-11196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170035#comment-14170035
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Steve Loughran commented on HADOOP-11196:
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ideally there should be some interface here...WASB and dfsclient could
implement it so flume could introspect on the method for now, but move onto
{{implements interface}} and casting in future. Introspection is too brittle
> Implement isFileClosed in WASB to make Flume happy
> --------------------------------------------------
>
> Key: HADOOP-11196
> URL: https://issues.apache.org/jira/browse/HADOOP-11196
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.5.1
> Reporter: Mostafa Elhemali
> Priority: Minor
>
> Flume uses reflection to call isFileClosed() which is a method implemented by
> DFS but not part of the FileSystem abstract base class. It still works if the
> function is not implemented, but issues a lot of warnings and is distracting.
> It would help make it work smoother if we added the same method in the
> NativeAzureFileSystem class.
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