From 2f1e9c5b93ddf06e1cd498753a2c4dd780837f6e Mon Sep 17 00:00:00 2001
From: Valentin Heiserer <valentin@heiserer.de>
Date: Fri, 31 Oct 2025 11:49:16 +0100
Subject: [PATCH] Aufgabe 4

---
 Aufgabe 4/main.py       | 90 +++++++++++++++++++++++++++++++++++++++++
 Aufgabe 4/sparkstart.py | 22 ++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 Aufgabe 4/main.py
 create mode 100644 Aufgabe 4/sparkstart.py

diff --git a/Aufgabe 4/main.py b/Aufgabe 4/main.py
new file mode 100644
index 0000000..392bcfa
--- /dev/null
+++ b/Aufgabe 4/main.py	
@@ -0,0 +1,90 @@
+from sparkstart import scon
+import os
+import matplotlib.pyplot as plt
+
+#--------------------------------Aufgabe a----------------------------------
+print("\nAufgabe a)")
+mylist = list(range(1,101))
+rd1 = scon.parallelize(mylist)
+
+mylist = list(range(50,151))
+rd2 = scon.parallelize(mylist)
+
+print(rd1.takeOrdered(22))
+print(rd2.takeOrdered(101))
+
+rd1.count()
+rd2.count()
+
+rd1.first()
+rd2.first()
+
+rd1.takeSample(False,10)
+rd2.takeSample(False,10)
+
+
+#--------------------------------Aufgabe b----------------------------------
+print("\nAufgabe b)")
+rd1_div_5_and_7 = rd1.filter(lambda x: (x % 5 == 0) and (x % 7 == 0))
+print(rd1_div_5_and_7.takeOrdered(100))
+
+
+#--------------------------------Aufgabe c----------------------------------
+print("\nAufgabe c)")
+intersection = rd1.intersection(rd2).sortBy(lambda x: x)
+union_set = rd1.union(rd2).distinct().sortBy(lambda x: x)
+diff_rd1_minus_rd2 = rd1.subtract(rd2).sortBy(lambda x: x)
+diff_rd2_minus_rd1 = rd2.subtract(rd1).sortBy(lambda x: x)
+cartesian_product = rd1.cartesian(rd2).sortBy(lambda p: (p[0], p[1]))
+
+print("\nDurchschnittsmenge:")
+intersection_vals = intersection.collect()
+print(intersection_vals)
+print("Anzahl:", len(intersection_vals))
+
+print("\nVereinigungsmenge:")
+union_vals = union_set.collect()
+print(union_vals)
+print("Anzahl:", len(union_vals))
+
+print("\nDifferenzmenge:")
+diff1_vals = diff_rd1_minus_rd2.collect()
+print(diff1_vals)
+print("Anzahl:", len(diff1_vals))
+
+print("\nDifferenzmenge:")
+diff2_vals = diff_rd2_minus_rd1.collect()
+print(diff2_vals)
+print("Anzahl:", len(diff2_vals))
+
+print("\nKreuzprodukt:")
+cart_vals = cartesian_product.collect()
+print(cart_vals)
+print("Anzahl:", len(cart_vals))
+
+
+#--------------------------------Aufgabe d----------------------------------
+rd3 = rd1.map(lambda x: (x, 1.0 / x))
+sum_rd3 = rd3.map(lambda kv: kv[1]).sum()
+print("\nSumme:", sum_rd3)
+
+rd3_sorted = rd3.sortByKey().collect()
+xs = [x for x, _ in rd3_sorted]
+ys = [y for _, y in rd3_sorted]
+
+plt.figure(figsize=(8, 4))
+plt.plot(xs, ys, marker='o', linestyle='-', color='tab:blue')
+plt.title('1/x über x (rd1)')
+plt.xlabel('x')
+plt.ylabel('1/x')
+plt.grid(True, alpha=0.3)
+
+plt.tight_layout()
+plt.close()
+
+#--------------------------------Aufgabe e----------------------------------
+product_rd2 = rd2.fold(1, lambda a, b: a * b)
+print("\nAufgabe e)")
+print(product_rd2)
+
+scon.stop()
diff --git a/Aufgabe 4/sparkstart.py b/Aufgabe 4/sparkstart.py
new file mode 100644
index 0000000..bdb7010
--- /dev/null
+++ b/Aufgabe 4/sparkstart.py	
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+
+"""
+Erzeugen einer Spark-Konfiguration
+"""
+
+from pyspark import SparkConf, SparkContext
+from pyspark.sql import SparkSession
+
+# connect to cluster
+conf = SparkConf().setMaster("spark://193.174.205.250:7077").setAppName("HeisererValentin")
+conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer")
+conf.set("spark.executor.memory", '32g')
+conf.set("spark.driver.memory", '8g')
+conf.set("spark.cores.max", "40")
+scon = SparkContext(conf=conf)
+
+
+spark = SparkSession \
+    .builder \
+    .appName("Python Spark SQL") \
+    .getOrCreate()