diff --git a/core/src/main/scala/org/apache/spark/storage/ShuffleBlockManager.scala b/core/src/main/scala/org/apache/spark/storage/ShuffleBlockManager.scala
index 8b202ac112304eac85285e5dbcd135cc2c3c443e..a3bb425208bdf581625c567d73cc4bb4a511639b 100644
--- a/core/src/main/scala/org/apache/spark/storage/ShuffleBlockManager.scala
+++ b/core/src/main/scala/org/apache/spark/storage/ShuffleBlockManager.scala
@@ -85,7 +85,6 @@ class ShuffleBlockManager(blockManager: BlockManager) extends Logging {
     def getNextFileId() = nextFileId.getAndIncrement()
     def getUnusedFileGroup() = unusedFileGroups.poll()
     def returnFileGroup(group: ShuffleFileGroup) = unusedFileGroups.add(group)
-    def returnFileGroups(groups: Seq[ShuffleFileGroup]) = unusedFileGroups.addAll(groups)
   }
 
   type ShuffleId = Int
diff --git a/core/src/main/scala/org/apache/spark/util/collection/PrimitiveKeyOpenHashMap.scala b/core/src/main/scala/org/apache/spark/util/collection/PrimitiveKeyOpenHashMap.scala
index a11988088498b279deecf3b99b626469fcea6400..d76143e45aa58117f8d64fdef20b4c9de28c01ee 100644
--- a/core/src/main/scala/org/apache/spark/util/collection/PrimitiveKeyOpenHashMap.scala
+++ b/core/src/main/scala/org/apache/spark/util/collection/PrimitiveKeyOpenHashMap.scala
@@ -53,6 +53,7 @@ class PrimitiveKeyOpenHashMap[@specialized(Long, Int) K: ClassManifest,
     _values(pos)
   }
 
+  /** Get the value for a given key, or returns elseValue if it doesn't exist. */
   def getOrElse(k: K, elseValue: V): V = {
     val pos = _keySet.getPos(k)
     if (pos >= 0) _values(pos) else elseValue