Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/12527#discussion_r60643219 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileScanRDD.scala --- @@ -131,4 +134,23 @@ class FileScanRDD( } override protected def getPartitions: Array[RDDPartition] = filePartitions.toArray + + override protected def getPreferredLocations(split: RDDPartition): Seq[String] = { + val files = split.asInstanceOf[FilePartition].files + + // Computes total number of bytes can be retrieved from each host. + val hostToNumBytes = mutable.HashMap.empty[String, Long] + files.foreach { file => + file.locations.filter(_ != "localhost").foreach { host => --- End diff -- I am not sure we should filter it out. For that test, localhost is the location of files belonging to one of the input tables (the side that is not shuffled), right?
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