[Spark] pyspark RDD parallelize() number

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

data_1 = list(range(0, 10))
data_2 = list(range(10, 20))
data_3 = list(range(20, 30))

rdd_1 = sc.parallelize(data_1)
rdd_2 = sc.parallelize(data_2)
rdd_3 = sc.parallelize(data_3)

print()
print(rdd_1)
print(rdd_1.count(), rdd_1.collect())
print()
print(rdd_2)
print(rdd_2.count(), rdd_2.collect())
print()
print(rdd_3)
print(rdd_3.count(), rdd_3.collect())
print()

sc.stop()

ParallelCollectionRDD[0] at readRDDFromFile at PythonRDD.scala:274
10 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]                                               

ParallelCollectionRDD[1] at readRDDFromFile at PythonRDD.scala:274
10 [10, 11, 12, 13, 14, 15, 16, 17, 18, 19]                                     

ParallelCollectionRDD[2] at readRDDFromFile at PythonRDD.scala:274
10 [20, 21, 22, 23, 24, 25, 26, 27, 28, 29]