1 files changed, 19 insertions, 6 deletions
diff --git a/core/src/main/scala/spark/storage/StorageLevel.scala b/core/src/main/scala/spark/storage/StorageLevel.scala
index 3b5a77ab22..f52650988c 100644
--- a/core/src/main/scala/spark/storage/StorageLevel.scala
+++ b/core/src/main/scala/spark/storage/StorageLevel.scala
@@ -1,3 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package spark.storage
 
 import java.io.{Externalizable, IOException, ObjectInput, ObjectOutput}
@@ -123,11 +140,7 @@ object StorageLevel {
   val storageLevelCache = new java.util.concurrent.ConcurrentHashMap[StorageLevel, StorageLevel]()
 
   private[spark] def getCachedStorageLevel(level: StorageLevel): StorageLevel = {
-    if (storageLevelCache.containsKey(level)) {
-      storageLevelCache.get(level)
-    } else {
-      storageLevelCache.put(level, level)
-      level
-    }
+    storageLevelCache.putIfAbsent(level, level)
+    storageLevelCache.get(level)
   }
 }