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libhdfs's Issues

ls throws IOError on empty directories

ls (FileSystem fs) p =
  withCString p $ \path   ->
  alloca        $ \numptr -> do
    cinfo <- throwErrnoIfNull "ls" $ ...

But Null is a valid return value for empty directories:

    /** 
     * hdfsListDirectory - Get list of files/directories for a given
     * directory-path. hdfsFreeFileInfo should be called to deallocate memory. 
     * @param fs The configured filesystem handle.
     * @param path The path of the directory. 
     * @param numEntries Set to the number of files/directories in path.
     * @return Returns a dynamically-allocated array of hdfsFileInfo
     * objects; NULL on error or empty directory.
     * errno is set to non-zero on error or zero on success.
     */
    LIBHDFS_EXTERNAL
    hdfsFileInfo *hdfsListDirectory(hdfsFS fs, const char* path,
                                    int *numEntries);

Please note that older releases of libhdfs C++ API documentation are incorrect about that.
See also: https://issues.apache.org/jira/browse/HDFS-8407

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