[SPARK-13948] MiMa check should catch if the visibility changes to private

MiMa excludes are currently generated using both the current Spark version's classes and Spark 1.2.0's classes, but this doesn't make sense: we should only be ignoring classes which were `private` in the previous Spark version, not classes which became private in the current version.

This patch updates `dev/mima` to only generate excludes with respect to the previous artifacts that MiMa checks against. It also updates `MimaBuild` so that `excludeClass` only applies directly to the class being excluded and not to its companion object (since a class and its companion object can have different accessibility).

Author: Josh Rosen <joshrosen@databricks.com>

Closes #11774 from JoshRosen/SPARK-13948.

1 files changed, 14 insertions, 10 deletions

diff --git a/project/SparkBuild.scala b/project/SparkBuild.scala
index f76cda08ec..dbe98d1e14 100644
--- a/project/SparkBuild.scala
+++ b/project/SparkBuild.scala
@@ -26,6 +26,7 @@ import sbt.Classpaths.publishTask
 import sbt.Keys._
 import sbtunidoc.Plugin.UnidocKeys.unidocGenjavadocVersion
 import com.typesafe.sbt.pom.{PomBuild, SbtPomKeys}
+import com.typesafe.tools.mima.plugin.MimaKeys
 
 import spray.revolver.RevolverPlugin._
 
@@ -247,12 +248,14 @@ object SparkBuild extends PomBuild {
   /* Enable tests settings for all projects except examples, assembly and tools */
   (allProjects ++ optionallyEnabledProjects).foreach(enable(TestSettings.settings))
 
-  allProjects.filterNot { x =>
+  val mimaProjects = allProjects.filterNot { x =>
     Seq(
       spark, hive, hiveThriftServer, catalyst, repl, networkCommon, networkShuffle, networkYarn,
       unsafe, testTags, sketch
     ).contains(x)
-  }.foreach { x =>
+  }
+
+  mimaProjects.foreach { x =>
     enable(MimaBuild.mimaSettings(sparkHome, x))(x)
   }
 
@@ -371,22 +374,23 @@ object ExcludedDependencies {
 }
 
 /**
- * Following project only exists to pull previous artifacts of Spark for generating
- * Mima ignores. For more information see: SPARK 2071
+ * Project to pull previous artifacts of Spark for generating Mima excludes.
  */
 object OldDeps {
 
   lazy val project = Project("oldDeps", file("dev"), settings = oldDepsSettings)
 
+  lazy val allPreviousArtifactKeys = Def.settingDyn[Seq[Option[ModuleID]]] {
+    SparkBuild.mimaProjects
+      .map { project => MimaKeys.previousArtifact in project }
+      .map(k => Def.setting(k.value))
+      .join
+  }
+
   def oldDepsSettings() = Defaults.coreDefaultSettings ++ Seq(
     name := "old-deps",
     scalaVersion := "2.10.5",
-    libraryDependencies := Seq(
-      "spark-streaming",
-      "spark-mllib",
-      "spark-graphx",
-      "spark-core"
-    ).map(id => "org.apache.spark" % (id + "_2.11") % "1.2.0")
+    libraryDependencies := allPreviousArtifactKeys.value.flatten
   )
 }