Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12860#discussion_r61929447
--- Diff: python/pyspark/sql/session.py ---
@@ -445,6 +452,77 @@ def read(self):
"""
return DataFrameReader(self._wrapped)
+ @classmethod
+ @since(2.0)
+ def builder(cls):
+ """Returns a new :class:`SparkSession.Builder` for constructing a
:class:`SparkSession`.
+ """
+ return SparkSession.Builder()
+
+ class Builder(object):
+ """Builder for :class:`SparkSession`.
+ """
+
+ _lock = RLock()
+ _options = {}
+
+ @since(2.0)
+ def config(self, key=None, value=None, conf=None):
+ """Sets a config option. Options set using this method are
automatically propagated to
+ both :class:`SparkConf` and :class:`SparkSession`'s own
configuration.
+
+ :param key: a key name string for configuration property
+ :param value: a value for configuration property
+ :param conf: an instance of :class:`SparkConf`
+ """
+ with SparkSession.Builder._lock:
+ if conf is None:
+ self._options[key] = str(value)
+ else:
+ for (k, v) in conf.getAll():
+ self._options[k] = v
+ return self
+
+ @since(2.0)
+ def master(self, master):
+ """Sets the Spark master URL to connect to, such as "local" to
run locally, "local[4]"
+ to run locally with 4 cores, or "spark://master:7077" to run
on a Spark standalone
+ cluster.
+
+ :param master: a url for spark master
+ """
+ return self.config("spark.master", master)
+
+ @since(2.0)
+ def appName(self, name):
+ """Sets a name for the application, which will be shown in the
Spark web UI.
+
+ :param name: an application name
+ """
+ return self.config("spark.app.name", name)
+
+ @since(2.0)
+ def enableHiveSupport(self):
+ """Enables Hive support, including connectivity to a
persistent Hive metastore, support
+ for Hive serdes, and Hive user-defined functions.
+ """
+ return self.config("spark.sql.catalogImplementation", "hive")
+
+ @since(2.0)
+ def getOrCreate(self):
+ """Gets an existing :class:`SparkSession` or, if there is no
existing one, creates a new
+ one based on the options set in this builder.
+ """
+ with SparkSession.Builder._lock:
+ from pyspark.conf import SparkConf
+ from pyspark.context import SparkContext
+ from pyspark.sql.context import SQLContext
+ sparkConf = SparkConf()
+ for key, value in self._options.items():
+ sparkConf.set(key, value)
+ sparkContext = SparkContext.getOrCreate(sparkConf)
+ return SQLContext.getOrCreate(sparkContext).sparkSession
+
--- End diff --
nvm, we also create a Builder every time in Scala.
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