Source Code for Module pyspark.storagelevel

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17   
18  __all__ = ["StorageLevel"] 
19   
20 -class StorageLevel: 
21      """ 
22      Flags for controlling the storage of an RDD. Each StorageLevel records whether to use memory, 
23      whether to drop the RDD to disk if it falls out of memory, whether to keep the data in memory 
24      in a serialized format, and whether to replicate the RDD partitions on multiple nodes. 
25      Also contains static constants for some commonly used storage levels, such as MEMORY_ONLY. 
26      """ 
27   
28 -    def __init__(self, useDisk, useMemory, useOffHeap, deserialized, replication = 1): 
29          self.useDisk = useDisk 
30          self.useMemory = useMemory 
31          self.useOffHeap = useOffHeap 
32          self.deserialized = deserialized 
33          self.replication = replication 
34   
35 -    def __repr__(self): 
36          return "StorageLevel(%s, %s, %s, %s, %s)" % ( 
37              self.useDisk, self.useMemory, self.useOffHeap, self.deserialized, self.replication) 
38   
39  StorageLevel.DISK_ONLY = StorageLevel(True, False, False, False) 
40  StorageLevel.DISK_ONLY_2 = StorageLevel(True, False, False, False, 2) 
41  StorageLevel.MEMORY_ONLY = StorageLevel(False, True, False, True) 
42  StorageLevel.MEMORY_ONLY_2 = StorageLevel(False, True, False, True, 2) 
43  StorageLevel.MEMORY_ONLY_SER = StorageLevel(False, True, False, False) 
44  StorageLevel.MEMORY_ONLY_SER_2 = StorageLevel(False, True, False, False, 2) 
45  StorageLevel.MEMORY_AND_DISK = StorageLevel(True, True, False, True) 
46  StorageLevel.MEMORY_AND_DISK_2 = StorageLevel(True, True, False, True, 2) 
47  StorageLevel.MEMORY_AND_DISK_SER = StorageLevel(True, True, False, False) 
48  StorageLevel.MEMORY_AND_DISK_SER_2 = StorageLevel(True, True, False, False, 2) 
49  StorageLevel.OFF_HEAP = StorageLevel(False, False, True, False, 1) 
50