Github user NathanHowell commented on the issue: https://github.com/apache/spark/pull/16089 @steveloughran Spark is handling the output committing somewhere further up the stack. The path being passed in to `OutputWriterFactory.newInstance` is to a temporary file, such as `/private/var/folders/sq/vmncyd7506q_ch43llrwr8sn6zfknl/T/spark-3db2844b-1f3c-45c2-8bf4-8a3c81440e38/_temporary/0/_temporary/attempt_20161201081833_0000_m_000000_0/part-00000-8dd44cea-c01e-4bfe-ab03-641ebce18afb.txt`. I'll make a pass through the existing tests to see if anything obvious is missing.
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