Speedup stats processing in Spark cluster #2871
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Write a copy of the listens to HDFS on import of a full dump, this makes speeds up filtering of listens and increases the speed of processing in many cases.
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Before this PR, an entire stats run took about 9 hours. With step 2, it went down to 6.25 hours and then with step 1 on top of it, it goes down to 5.75 hours.