rename StorageLevel.TACHYON to Storage.OFF_HEAP

Author: RongGu

core/src/main/java/org/apache/spark/api/java/StorageLevels.java

@@ -34,7 +34,7 @@ public class StorageLevels {
   public static final StorageLevel MEMORY_AND_DISK_2 = create(true, true, false, true, 2);
   public static final StorageLevel MEMORY_AND_DISK_SER = create(true, true, false, false, 1);
   public static final StorageLevel MEMORY_AND_DISK_SER_2 = create(true, true, false, false, 2);
-  public static final StorageLevel TACHYON = create(false, false, true, false, 1);
+  public static final StorageLevel OFF_HEAP = create(false, false, true, false, 1);
 
   /**
    * Create a new StorageLevel object.

examples/src/main/scala/org/apache/spark/examples/SparkTachyonPi.scala

@@ -38,7 +38,7 @@ object SparkTachyonPi {
     val n = 100000 * slices
 
     val rdd = spark.parallelize(1 to n, slices)
-    rdd.persist(StorageLevel.TACHYON)
+    rdd.persist(StorageLevel.OFF_HEAP)
     val count = rdd.map { i =>
       val x = random * 2 - 1
       val y = random * 2 - 1