[SPARK-3433][BUILD] Fix for Mima false-positives with @DeveloperAPI and @experimental annotations.

Actually false positive reported was due to mima generator not picking up the new jars in presence of old jars(theoretically this should not have happened.). So as a workaround, ran them both separately and just append them together.

Author: Prashant Sharma <[email protected]>
Author: Prashant Sharma <[email protected]>

Closes #2285 from ScrapCodes/mima-fix and squashes the following commits:

093c76f [Prashant Sharma] Update mima
59012a8 [Prashant Sharma] Update mima
35b6c71 [Prashant Sharma] SPARK-3433 Fix for Mima false-positives with @DeveloperAPI and @experimental annotations.

(cherry picked from commit ecf0c02)
Signed-off-by: Josh Rosen <[email protected]>

Conflicts:
	project/MimaExcludes.scala

Author: ScrapCodes

dev/mima

@@ -25,11 +25,19 @@ FWDIR="$(cd `dirname $0`/..; pwd)"
 cd "$FWDIR"
 
 echo -e "q\n" | sbt/sbt oldDeps/update
+rm -f .generated-mima*
+
+# Generate Mima Ignore is called twice, first with latest built jars 
+# on the classpath and then again with previous version jars on the classpath.
+# Because of a bug in GenerateMIMAIgnore that when old jars are ahead on classpath
+# it did not process the new classes (which are in assembly jar). 
+./bin/spark-class org.apache.spark.tools.GenerateMIMAIgnore
 
 export SPARK_CLASSPATH=`find lib_managed \( -name '*spark*jar' -a -type f \) | tr "\\n" ":"`
 echo "SPARK_CLASSPATH=$SPARK_CLASSPATH"
 
 ./bin/spark-class org.apache.spark.tools.GenerateMIMAIgnore
+
 echo -e "q\n" | sbt/sbt mima-report-binary-issues | grep -v -e "info.*Resolving"
 ret_val=$?
 

project/MimaBuild.scala

@@ -30,6 +30,12 @@ object MimaBuild {
 
   def excludeMember(fullName: String) = Seq(
       ProblemFilters.exclude[MissingMethodProblem](fullName),
+      // Sometimes excluded methods have default arguments and 
+      // they are translated into public methods/fields($default$) in generated
+      // bytecode. It is not possible to exhustively list everything.
+      // But this should be okay.
+      ProblemFilters.exclude[MissingMethodProblem](fullName+"$default$2"),
+      ProblemFilters.exclude[MissingMethodProblem](fullName+"$default$1"),
       ProblemFilters.exclude[MissingFieldProblem](fullName),
       ProblemFilters.exclude[IncompatibleResultTypeProblem](fullName),
       ProblemFilters.exclude[IncompatibleMethTypeProblem](fullName),

project/SparkBuild.scala

@@ -187,7 +187,7 @@ object OldDeps {
     Some("org.apache.spark" % fullId % "1.0.0")
   }
 
-  def oldDepsSettings() = Defaults.defaultSettings ++ Seq(
+  def oldDepsSettings() = Defaults.coreDefaultSettings ++ Seq(
     name := "old-deps",
     scalaVersion := "2.10.4",
     retrieveManaged := true,

tools/src/main/scala/org/apache/spark/tools/GenerateMIMAIgnore.scala

@@ -24,6 +24,7 @@ import scala.collection.mutable
 import scala.collection.JavaConversions._
 import scala.reflect.runtime.universe.runtimeMirror
 import scala.reflect.runtime.{universe => unv}
+import scala.util.Try
 
 /**
  * A tool for generating classes to be excluded during binary checking with MIMA. It is expected
@@ -121,12 +122,17 @@ object GenerateMIMAIgnore {
   }
 
   def main(args: Array[String]) {
+    import scala.tools.nsc.io.File
     val (privateClasses, privateMembers) = privateWithin("org.apache.spark")
-    scala.tools.nsc.io.File(".generated-mima-class-excludes").
-      writeAll(privateClasses.mkString("\n"))
+    val previousContents = Try(File(".generated-mima-class-excludes").lines()).
+      getOrElse(Iterator.empty).mkString("\n")
+    File(".generated-mima-class-excludes")
+      .writeAll(previousContents + privateClasses.mkString("\n"))
     println("Created : .generated-mima-class-excludes in current directory.")
-    scala.tools.nsc.io.File(".generated-mima-member-excludes").
-      writeAll(privateMembers.mkString("\n"))
+    val previousMembersContents = Try(File(".generated-mima-member-excludes").lines)
+      .getOrElse(Iterator.empty).mkString("\n")
+    File(".generated-mima-member-excludes").writeAll(previousMembersContents +
+      privateMembers.mkString("\n"))
     println("Created : .generated-mima-member-excludes in current directory.")
   }