Github user nongli commented on the pull request: https://github.com/apache/spark/pull/10604#issuecomment-169133603 @cloud-fan I'm not sure I understand your question. We are guaranteed that for a bucketed data set, each file in HDFS is for the same bucket. We need to coalesce however the input split decided to split the file back into one RDD partition per bucket, grouping using the file name.
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