in spark streaming, I want to use fileStream to monitor a directory. But the
files in that directory are compressed using lz4. So the new lz4 files are
not detected by the following code. How to detect these new files?
val list_join_action_stream = ssc.fileStream[LongWritable, Text,
TextInputFormat](gc.input_dir, (t: Path) => true, false).map(_._2.toString)
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