Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/6674#discussion_r32250114
--- Diff: project/SparkBuild.scala ---
@@ -51,6 +51,11 @@ object BuildCommons {
// Root project.
val spark = ProjectRef(buildLocation, "spark")
val sparkHome = buildLocation
+
+ val testTempDir = s"$sparkHome/target/tmp"
+ if (!new File(testTempDir).isDirectory()) {
+ require(new File(testTempDir).mkdirs())
+ }
--- End diff --
The problem with doing it this way is that `buildLocation` is just using
the current directory as the build root, which is not always a valid
assumption. We should instead remove that `val` and use `projectRoot.value`
anyplace that we need the root spark directory.
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