Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12153#discussion_r59598886
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileScanRDD.scala
---
@@ -86,4 +87,9 @@ class FileScanRDD(
}
override protected def getPartitions: Array[Partition] =
filePartitions.toArray
+
+ override protected def getPreferredLocations(split: Partition):
Seq[String] = {
+ val files = split.asInstanceOf[FilePartition].files
+ if (files.isEmpty) Seq.empty else files.maxBy(_.length).locations
--- End diff --
Should we pick the top 3 host that hold most of the data?
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