6f36db1fa5
### What changes were proposed in this pull request? Since the data is serialized on the Python side, we should make cache() in PySpark dataframes use StorageLevel.MEMORY_AND_DISK mode which has deserialized=false. This change was done to `pyspark/rdd.py` as part of SPARK-2014 but was missed from `pyspark/dataframe.py` ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Using existing tests Closes #29242 from abhishekd0907/SPARK-31448. Authored-by: Abhishek Dixit <abhishekdixit0907@gmail.com> Signed-off-by: Sean Owen <srowen@gmail.com>
61 lines
2.7 KiB
Python
61 lines
2.7 KiB
Python
#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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__all__ = ["StorageLevel"]
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class StorageLevel(object):
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"""
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Flags for controlling the storage of an RDD. Each StorageLevel records whether to use memory,
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whether to drop the RDD to disk if it falls out of memory, whether to keep the data in memory
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in a JAVA-specific serialized format, and whether to replicate the RDD partitions on multiple
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nodes. Also contains static constants for some commonly used storage levels, MEMORY_ONLY.
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Since the data is always serialized on the Python side, all the constants use the serialized
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formats.
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"""
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def __init__(self, useDisk, useMemory, useOffHeap, deserialized, replication=1):
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self.useDisk = useDisk
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self.useMemory = useMemory
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self.useOffHeap = useOffHeap
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self.deserialized = deserialized
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self.replication = replication
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def __repr__(self):
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return "StorageLevel(%s, %s, %s, %s, %s)" % (
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self.useDisk, self.useMemory, self.useOffHeap, self.deserialized, self.replication)
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def __str__(self):
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result = ""
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result += "Disk " if self.useDisk else ""
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result += "Memory " if self.useMemory else ""
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result += "OffHeap " if self.useOffHeap else ""
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result += "Deserialized " if self.deserialized else "Serialized "
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result += "%sx Replicated" % self.replication
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return result
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StorageLevel.DISK_ONLY = StorageLevel(True, False, False, False)
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StorageLevel.DISK_ONLY_2 = StorageLevel(True, False, False, False, 2)
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StorageLevel.DISK_ONLY_3 = StorageLevel(True, False, False, False, 3)
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StorageLevel.MEMORY_ONLY = StorageLevel(False, True, False, False)
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StorageLevel.MEMORY_ONLY_2 = StorageLevel(False, True, False, False, 2)
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StorageLevel.MEMORY_AND_DISK = StorageLevel(True, True, False, False)
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StorageLevel.MEMORY_AND_DISK_2 = StorageLevel(True, True, False, False, 2)
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StorageLevel.OFF_HEAP = StorageLevel(True, True, True, False, 1)
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StorageLevel.MEMORY_AND_DISK_DESER = StorageLevel(True, True, False, True)
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