def build_spark_session(app_name,  memory='10g', executors=16):
	    return SparkSession.builder\
			.appName(app_name)\
			.config("spark.driver.maxResultSize", memory)\
			.config('spark.driver.memory', memory)\
			.config('spark.executor.memory', memory)\
			.config("spark.dynamicAllocation.enabled", 'true')\
			.config("spark.dynamicAllocation.minExecutors", 4)\
			.config("spark.dynamicAllocation.maxExecutors", 24)\
			.config("spark.dynamicAllocation.initialExecutors", 4)\
			.getOrCreate()