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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/03/06 09:13:53 UTC

[GitHub] [spark] fitermay opened a new pull request #23986: SPARK-27070

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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