Github user piaozhexiu commented on the pull request:
https://github.com/apache/spark/pull/8512#issuecomment-138750423
I undid the parallel collection change in `SparkS3Util` because `UnionRDD`
is now parallelized. Since `AmazonS3Client` already bulk-lists 1000 files at a
time, and there are usually less than 1000 files in a partition, it's not
useful to have an extra level of parallel in `SparkS3Util`.
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