Github user liancheng commented on a diff in the pull request: https://github.com/apache/spark/pull/12153#discussion_r58720687 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileScanRDD.scala --- @@ -86,4 +87,8 @@ class FileScanRDD( } override protected def getPartitions: Array[Partition] = filePartitions.toArray + + override protected def getPreferredLocations(split: Partition): Seq[String] = { + split.asInstanceOf[FilePartition].files.flatMap(_.locations).distinct --- End diff -- Added a constraint so that we only pick locations of blocks whose sizes are larger than 10% of the whole file partition.
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