1 files changed, 10 insertions, 7 deletions
diff --git a/core/src/main/scala/org/apache/spark/storage/StorageLevel.scala b/core/src/main/scala/org/apache/spark/storage/StorageLevel.scala
index c9a52e0366..363de93e06 100644
--- a/core/src/main/scala/org/apache/spark/storage/StorageLevel.scala
+++ b/core/src/main/scala/org/apache/spark/storage/StorageLevel.scala
@@ -22,14 +22,17 @@ import java.io.{Externalizable, IOException, ObjectInput, ObjectOutput}
 import org.apache.spark.annotation.DeveloperApi
 
 /**
+ * :: DeveloperApi ::
  * Flags for controlling the storage of an RDD. Each StorageLevel records whether to use memory,
  * or Tachyon, whether to drop the RDD to disk if it falls out of memory or Tachyon , whether to
  * keep the data in memory in a serialized format, and whether to replicate the RDD partitions on
  * multiple nodes.
+ *
  * The [[org.apache.spark.storage.StorageLevel$]] singleton object contains some static constants
  * for commonly useful storage levels. To create your own storage level object, use the
  * factory method of the singleton object (`StorageLevel(...)`).
  */
+@DeveloperApi
 class StorageLevel private(
     private var useDisk_ : Boolean,
     private var useMemory_ : Boolean,
@@ -54,9 +57,9 @@ class StorageLevel private(
   assert(replication < 40, "Replication restricted to be less than 40 for calculating hashcodes")
 
   if (useOffHeap) {
-    require(useDisk == false, "Off-heap storage level does not support using disk")
-    require(useMemory == false, "Off-heap storage level does not support using heap memory")
-    require(deserialized == false, "Off-heap storage level does not support deserialized storage")
+    require(!useDisk, "Off-heap storage level does not support using disk")
+    require(!useMemory, "Off-heap storage level does not support using heap memory")
+    require(!deserialized, "Off-heap storage level does not support deserialized storage")
     require(replication == 1, "Off-heap storage level does not support multiple replication")
   }
 
@@ -146,7 +149,7 @@ object StorageLevel {
 
   /**
    * :: DeveloperApi ::
-   * Create a new StorageLevel object without setting useOffHeap
+   * Create a new StorageLevel object without setting useOffHeap.
    */
   @DeveloperApi
   def apply(useDisk: Boolean, useMemory: Boolean, useOffHeap: Boolean,
@@ -155,7 +158,7 @@ object StorageLevel {
 
   /**
    * :: DeveloperApi ::
-   * Create a new StorageLevel object
+   * Create a new StorageLevel object.
    */
   @DeveloperApi
   def apply(useDisk: Boolean, useMemory: Boolean,
@@ -164,7 +167,7 @@ object StorageLevel {
 
   /**
    * :: DeveloperApi ::
-   * Create a new StorageLevel object from its integer representation
+   * Create a new StorageLevel object from its integer representation.
    */
   @DeveloperApi
   def apply(flags: Int, replication: Int): StorageLevel =
@@ -172,7 +175,7 @@ object StorageLevel {
 
   /**
    * :: DeveloperApi ::
-   * Read StorageLevel object from ObjectInput stream
+   * Read StorageLevel object from ObjectInput stream.
    */
   @DeveloperApi
   def apply(in: ObjectInput): StorageLevel = {