Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/12860#discussion_r61841944 --- 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 -- We could create a builder here, then we can use it like this: ``` SparkSession.builder.master().getOrCreater() ```
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