review comment

Author: liguoqiang

core/src/main/scala/org/apache/spark/SparkContext.scala

@@ -851,8 +851,10 @@ class SparkContext(
       partitions: Seq[Int],
       allowLocal: Boolean,
       resultHandler: (Int, U) => Unit) {
-    val outIndex = partitions.toSet.diff(rdd.partitions.map(_.index).toSet)
-    require(outIndex.isEmpty,"Partition index out of bounds: " + outIndex.mkString(","))
+    // TODO: All RDDs have continuous index space. How to ensure this?
+    partitions.foreach{ p =>
+      require(p >= 0 && p < rdd.partitions.size, s"Invalid partition requested: $p")
+    }
     val callSite = getCallSite
     val cleanedFunc = clean(func)
     logInfo("Starting job: " + callSite)
@@ -956,8 +958,9 @@ class SparkContext(
       resultHandler: (Int, U) => Unit,
       resultFunc: => R): SimpleFutureAction[R] =
   {
-    val outIndex = partitions.toSet.diff(rdd.partitions.map(_.index).toSet)
-    require(outIndex.isEmpty,"Partition index out of bounds: " + outIndex.mkString(","))
+    partitions.foreach{ p =>
+      require(p >= 0 && p < rdd.partitions.size, s"Invalid partition requested: $p")
+    }
     val cleanF = clean(processPartition)
     val callSite = getCallSite
     val waiter = dagScheduler.submitJob(