add python code

Author: haoyuan

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

@@ -34,7 +34,6 @@ public class StorageLevels {
   public static final StorageLevel MEMORY_AND_DISK_2 = new StorageLevel(true, true, false, true, 2);
   public static final StorageLevel MEMORY_AND_DISK_SER = new StorageLevel(true, true, false, false, 1);
   public static final StorageLevel MEMORY_AND_DISK_SER_2 = new StorageLevel(true, true, false, false, 2);
-
   public static final StorageLevel TACHYON = new StorageLevel(false, false, true, false, 1);
 
   /**

python/pyspark/storagelevel.py

@@ -25,23 +25,25 @@ class StorageLevel:
     Also contains static constants for some commonly used storage levels, such as MEMORY_ONLY.
     """
 
-    def __init__(self, useDisk, useMemory, deserialized, replication = 1):
+    def __init__(self, useDisk, useMemory, useTachyon, deserialized, replication = 1):
         self.useDisk = useDisk
         self.useMemory = useMemory
+        self.useTachyon = useTachyon
         self.deserialized = deserialized
         self.replication = replication
 
     def __repr__(self):
         return "StorageLevel(%s, %s, %s, %s)" % (
             self.useDisk, self.useMemory, self.deserialized, self.replication)
 
-StorageLevel.DISK_ONLY = StorageLevel(True, False, False)
-StorageLevel.DISK_ONLY_2 = StorageLevel(True, False, False, 2)
-StorageLevel.MEMORY_ONLY = StorageLevel(False, True, True)
-StorageLevel.MEMORY_ONLY_2 = StorageLevel(False, True, True, 2)
-StorageLevel.MEMORY_ONLY_SER = StorageLevel(False, True, False)
-StorageLevel.MEMORY_ONLY_SER_2 = StorageLevel(False, True, False, 2)
-StorageLevel.MEMORY_AND_DISK = StorageLevel(True, True, True)
-StorageLevel.MEMORY_AND_DISK_2 = StorageLevel(True, True, True, 2)
-StorageLevel.MEMORY_AND_DISK_SER = StorageLevel(True, True, False)
-StorageLevel.MEMORY_AND_DISK_SER_2 = StorageLevel(True, True, False, 2)
+StorageLevel.DISK_ONLY = StorageLevel(True, False, False, False)
+StorageLevel.DISK_ONLY_2 = StorageLevel(True, False, False, False, 2)
+StorageLevel.MEMORY_ONLY = StorageLevel(False, True, False, True)
+StorageLevel.MEMORY_ONLY_2 = StorageLevel(False, True, False, True, 2)
+StorageLevel.MEMORY_ONLY_SER = StorageLevel(False, True, False, False)
+StorageLevel.MEMORY_ONLY_SER_2 = StorageLevel(False, True, False, False, 2)
+StorageLevel.MEMORY_AND_DISK = StorageLevel(True, True, False, True)
+StorageLevel.MEMORY_AND_DISK_2 = StorageLevel(True, True, False, True, 2)
+StorageLevel.MEMORY_AND_DISK_SER = StorageLevel(True, True, False, False)
+StorageLevel.MEMORY_AND_DISK_SER_2 = StorageLevel(True, True, False, False, 2)
+StorageLevel.TACHYON = StorageLevel(False, False, True, False, 1)