[Spark] pyspark RDD upper(), lower()

code

from pyspark.sql import SparkSession

spark = SparkSession.builder \
                    .appName('0_test_rdd') \
                    .master('spark://spark-master-1:7077,spark-master-2:7077') \
                    .config('spark.driver.cores', '2') \
                    .config('spark.driver.memory','2g') \
                    .config('spark.executor.memory', '2g') \
                    .config('spark.executor.cores', '2') \
                    .config('spark.cores.max', '8') \
                    .getOrCreate()

sc = spark.sparkContext

line_1 = 'i love you'
line_2 = 'you are my friend'
line_3 = 'my name is park'

lines_upper = sc.parallelize([line_1.upper(), 
                              line_2.upper(), 
                              line_3.upper()])

lines_lower = sc.parallelize([line_1.lower(), 
                              line_2.lower(), 
                              line_3.lower()])

print()
print(lines_upper)
print(lines_upper.collect())
print()
print(lines_lower)
print(lines_lower.collect())
print()

sc.stop()

result

ParallelCollectionRDD[0] at readRDDFromFile at PythonRDD.scala:274
['I LOVE YOU', 'YOU ARE MY FRIEND', 'MY NAME IS PARK']                          

ParallelCollectionRDD[1] at readRDDFromFile at PythonRDD.scala:274
['i love you', 'you are my friend', 'my name is park']