Adding source code for chapter 8

Chapter8/rdd/rddaction1.py

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+#rddaction1.py: rdd action functions
+
+#please ignore next 2 statements if running directly in PySpark shell
+import time
+
+from pyspark.sql import SparkSession
+spark = SparkSession.builder.master("local[*]")\
+    .appName("RDD Test app")\
+    .getOrCreate()
+
+data = [5, 4, 6, 3, 2, 8, 9, 2, 8, 7,
+        8, 4, 4, 8, 2, 7, 8, 9, 6, 9]
+rdd1 = spark.sparkContext.parallelize(data)
+
+print("RDD contents with partitions: "+rdd1.glom().collect())
+print("Count by values: "+rdd1.countByValue())
+print("reduce function"+rdd1.reduce(lambda a,b: a+b))
+print("Sum of RDD contents"+rdd1.sum())
+print(""+rdd1.top(5))
+print(rdd1.count())
+print(rdd1.max())
+print(rdd1.min())
+
+time.sleep(60)