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https://issues.apache.org/jira/browse/FLINK-2580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen closed FLINK-2580.
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> HadoopDataOutputStream does not expose enough methods of
> org.apache.hadoop.fs.FSDataOutputStream
> ------------------------------------------------------------------------------------------------
>
> Key: FLINK-2580
> URL: https://issues.apache.org/jira/browse/FLINK-2580
> Project: Flink
> Issue Type: Improvement
> Components: Hadoop Compatibility
> Reporter: Arnaud Linz
> Assignee: Stephan Ewen
> Priority: Minor
> Fix For: 0.10
>
>
> I’ve noticed that when you use org.apache.flink.core.fs.FileSystem to write
> into a hdfs file, calling
> org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.create(), it returns a
> HadoopDataOutputStream that wraps a org.apache.hadoop.fs.FSDataOutputStream
> (under its org.apache.hadoop.hdfs.client .HdfsDataOutputStream wrappper).
>
> However, FSDataOutputStream exposes many methods like flush, getPos etc,
> but HadoopDataOutputStream only wraps write & close.
>
> For instance, flush() calls the default, empty implementation of OutputStream
> instead of the hadoop one, and that’s confusing. Moreover, because of the
> restrictive OutputStream interface, hsync() and hflush() are not exposed to
> Flink.
> I see two options:
> - complete the class to wrap all methods of OutputStream and add a
> getWrappedStream() to access other stuff like hsync().
> - get rid of the Hadoop wrapping and directly use Hadoop file system objects.
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