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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