fitermay opened a new pull request #23986: SPARK-27070 URL: https://github.com/apache/spark/pull/23986 When trying to coalesce a UnionRDD of two large FileScanRDDs (each with a few million partitions) into around 8k partitions the driver can stall for over an hour. Profiler shows that over 90% of the time is spent in TimSort which is invoked by `pickBin`. This patch replaces sorting with a more efficient `min` for the purpose of finding the least occupied PartitionGroup
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