Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/12153#discussion_r59707908
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileSourceStrategy.scala
---
@@ -197,4 +204,26 @@ private[sql] object FileSourceStrategy extends
Strategy with Logging {
case _ => Nil
}
+
+ private def getBlockLocations(file: FileStatus): Array[BlockLocation] =
file match {
+ case f: LocatedFileStatus => f.getBlockLocations
+ case f => Array.empty[BlockLocation]
+ }
+
+ // Given locations of all blocks of a single file, `blockLocations`, and
an `offset` position of
+ // the same file, find out the index of the block that contains this
`offset`. If no such block
+ // can be found, returns -1.
+ private def getBlockIndex(blockLocations: Array[BlockLocation], offset:
Long): Int = {
+ blockLocations.indexWhere { b =>
+ b.getOffset <= offset && offset < b.getOffset + b.getLength
+ }
+ }
+
+ // Given locations of all blocks of a single file, `blockLocations`, and
an `offset` position of
+ // the same file, find out the block that contains this `offset`, and
returns location hosts of
+ // that block. If no such block can be found, returns an empty array.
+ private def getBlockHosts(blockLocations: Array[BlockLocation], offset:
Long): Array[String] = {
--- End diff --
Makes sense, updated.
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