diff --git a/core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala b/core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
index 026a569e7ec53..1af4e5f0b6d08 100644
--- a/core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
+++ b/core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
@@ -43,6 +43,7 @@ import org.apache.spark.deploy.SparkHadoopUtil
 import org.apache.spark.partial.{BoundedDouble, PartialResult}
 import org.apache.spark.serializer.Serializer
 import org.apache.spark.util.Utils
+import org.apache.spark.util.collection.CompactBuffer
 import org.apache.spark.util.random.StratifiedSamplingUtils
 
 /**
diff --git a/core/src/test/scala/org/apache/spark/rdd/PairRDDFunctionsSuite.scala b/core/src/test/scala/org/apache/spark/rdd/PairRDDFunctionsSuite.scala
index 8d90ce3e92d12..ec2822c49f609 100644
--- a/core/src/test/scala/org/apache/spark/rdd/PairRDDFunctionsSuite.scala
+++ b/core/src/test/scala/org/apache/spark/rdd/PairRDDFunctionsSuite.scala
@@ -159,7 +159,7 @@ class PairRDDFunctionsSuite extends FunSuite with SharedSparkContext {
       takeSampleAndValidatePoisson(stratifiedData, false, samplingRate, seed, n)
     }
 
-    val defaultSeed = 42L
+    val defaultSeed = 1L
 
     // vary RDD size
     for (n <- List(100, 1000, 1000000)) {