94c6c06ea1
The default constructor loads default properties, which can fail the test. Author: Xiangrui Meng <meng@databricks.com> Closes #775 from mengxr/pyspark-conf-fix and squashes the following commits: 83ef6c4 [Xiangrui Meng] do not load defaults when testing SparkConf in pyspark
175 lines
5.8 KiB
Python
175 lines
5.8 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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"""
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>>> from pyspark.conf import SparkConf
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>>> from pyspark.context import SparkContext
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>>> conf = SparkConf()
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>>> conf.setMaster("local").setAppName("My app")
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<pyspark.conf.SparkConf object at ...>
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>>> conf.get("spark.master")
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u'local'
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>>> conf.get("spark.app.name")
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u'My app'
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>>> sc = SparkContext(conf=conf)
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>>> sc.master
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u'local'
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>>> sc.appName
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u'My app'
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>>> sc.sparkHome == None
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True
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>>> conf = SparkConf(loadDefaults=False)
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>>> conf.setSparkHome("/path")
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<pyspark.conf.SparkConf object at ...>
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>>> conf.get("spark.home")
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u'/path'
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>>> conf.setExecutorEnv("VAR1", "value1")
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<pyspark.conf.SparkConf object at ...>
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>>> conf.setExecutorEnv(pairs = [("VAR3", "value3"), ("VAR4", "value4")])
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<pyspark.conf.SparkConf object at ...>
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>>> conf.get("spark.executorEnv.VAR1")
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u'value1'
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>>> print conf.toDebugString()
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spark.executorEnv.VAR1=value1
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spark.executorEnv.VAR3=value3
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spark.executorEnv.VAR4=value4
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spark.home=/path
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>>> sorted(conf.getAll(), key=lambda p: p[0])
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[(u'spark.executorEnv.VAR1', u'value1'), (u'spark.executorEnv.VAR3', u'value3'), (u'spark.executorEnv.VAR4', u'value4'), (u'spark.home', u'/path')]
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"""
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class SparkConf(object):
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"""
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Configuration for a Spark application. Used to set various Spark
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parameters as key-value pairs.
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Most of the time, you would create a SparkConf object with
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C{SparkConf()}, which will load values from C{spark.*} Java system
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properties as well. In this case, any parameters you set directly on
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the C{SparkConf} object take priority over system properties.
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For unit tests, you can also call C{SparkConf(false)} to skip
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loading external settings and get the same configuration no matter
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what the system properties are.
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All setter methods in this class support chaining. For example,
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you can write C{conf.setMaster("local").setAppName("My app")}.
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Note that once a SparkConf object is passed to Spark, it is cloned
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and can no longer be modified by the user.
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"""
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def __init__(self, loadDefaults=True, _jvm=None, _jconf=None):
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"""
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Create a new Spark configuration.
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@param loadDefaults: whether to load values from Java system
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properties (True by default)
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@param _jvm: internal parameter used to pass a handle to the
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Java VM; does not need to be set by users
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@param _jconf: Optionally pass in an existing SparkConf handle
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to use its parameters
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"""
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if _jconf:
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self._jconf = _jconf
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else:
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from pyspark.context import SparkContext
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SparkContext._ensure_initialized()
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_jvm = _jvm or SparkContext._jvm
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self._jconf = _jvm.SparkConf(loadDefaults)
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def set(self, key, value):
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"""Set a configuration property."""
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self._jconf.set(key, unicode(value))
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return self
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def setMaster(self, value):
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"""Set master URL to connect to."""
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self._jconf.setMaster(value)
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return self
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def setAppName(self, value):
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"""Set application name."""
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self._jconf.setAppName(value)
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return self
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def setSparkHome(self, value):
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"""Set path where Spark is installed on worker nodes."""
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self._jconf.setSparkHome(value)
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return self
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def setExecutorEnv(self, key=None, value=None, pairs=None):
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"""Set an environment variable to be passed to executors."""
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if (key != None and pairs != None) or (key == None and pairs == None):
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raise Exception("Either pass one key-value pair or a list of pairs")
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elif key != None:
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self._jconf.setExecutorEnv(key, value)
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elif pairs != None:
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for (k, v) in pairs:
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self._jconf.setExecutorEnv(k, v)
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return self
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def setAll(self, pairs):
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"""
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Set multiple parameters, passed as a list of key-value pairs.
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@param pairs: list of key-value pairs to set
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"""
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for (k, v) in pairs:
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self._jconf.set(k, v)
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return self
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def get(self, key, defaultValue=None):
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"""Get the configured value for some key, or return a default otherwise."""
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if defaultValue == None: # Py4J doesn't call the right get() if we pass None
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if not self._jconf.contains(key):
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return None
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return self._jconf.get(key)
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else:
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return self._jconf.get(key, defaultValue)
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def getAll(self):
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"""Get all values as a list of key-value pairs."""
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pairs = []
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for elem in self._jconf.getAll():
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pairs.append((elem._1(), elem._2()))
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return pairs
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def contains(self, key):
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"""Does this configuration contain a given key?"""
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return self._jconf.contains(key)
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def toDebugString(self):
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"""
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Returns a printable version of the configuration, as a list of
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key=value pairs, one per line.
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"""
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return self._jconf.toDebugString()
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def _test():
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import doctest
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(failure_count, test_count) = doctest.testmod(optionflags=doctest.ELLIPSIS)
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if failure_count:
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exit(-1)
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if __name__ == "__main__":
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_test()
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