initial version of spark client connecting to k8s spark cluster

Signed-off-by: shekharrajak <shekharrajak@live.com>

Author: Shekharrajak

.gitignore

@@ -15,3 +15,4 @@ bin
 
 coverage.xml
 htmlcov/
+uv.lock

examples/spark/01_hello_spark_pi.py

@@ -0,0 +1,220 @@
+#!/usr/bin/env python3
+"""
+Title: Hello Spark - Calculate Pi
+Level: 1 (Beginner)
+Target Audience: Data Scientists new to Spark
+Time to Run: ~2-3 minutes
+
+Description:
+Your first Spark job! This example demonstrates how to submit a simple PySpark application
+that calculates Pi using the Monte Carlo method - a classic distributed computing example
+that shows how Spark distributes work across executors.
+
+Prerequisites:
+- Kind cluster with Spark Operator (run ./setup_test_environment.sh)
+- Default namespace with 'spark-operator-spark' service account
+
+What You'll Learn:
+- How to create a SparkClient
+- Submit a PySpark application
+- Wait for job completion
+- Retrieve and parse job logs
+- Clean up resources
+
+Real-World Use Case:
+Distributed computation, parallel processing, Monte Carlo simulations.
+"""
+
+from datetime import datetime
+import os
+import sys
+
+# Add SDK to path for development mode
+sdk_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "../.."))
+if sdk_path not in sys.path:
+    sys.path.insert(0, sdk_path)
+
+from kubeflow.spark import (  # noqa: E402
+    ApplicationState,
+    OperatorBackendConfig,
+    SparkClient,
+)
+
+
+def main():
+    """Main example: Submit Pi calculation job and get results."""
+
+    print("=" * 80)
+    print("EXAMPLE 01: Hello Spark - Calculate Pi")
+    print("=" * 80)
+    print()
+    print("This example demonstrates:")
+    print("  1. Creating a Spark client")
+    print("  2. Submitting a PySpark application (Calculate Pi)")
+    print("  3. Monitoring job progress")
+    print("  4. Retrieving results from logs")
+    print()
+
+    # Step 1: Create SparkClient with configuration
+    print("Step 1: Creating Spark client...")
+    config = OperatorBackendConfig(
+        namespace=os.getenv("SPARK_NAMESPACE", "default"),
+        service_account="spark-operator-spark",
+        default_spark_image="docker.io/library/spark",
+        context=os.getenv("KUBE_CONTEXT", "kind-spark-test"),
+        enable_monitoring=False,  # Keep it simple for beginners
+        enable_ui=False,  # We'll enable this in later examples
+    )
+    client = SparkClient(backend_config=config)
+    print("  Client created successfully")
+    print()
+
+    # Step 2: Prepare the application
+    # Use timestamp to ensure unique name each run
+    timestamp = datetime.now().strftime("%H%M%S")
+    app_name = f"hello-spark-{timestamp}"
+
+    print("Step 2: Configuring Spark application...")
+    print(f"  App name: {app_name}")
+    print("  Spark version: 4.0.0")
+    print("  Resources: 1 driver + 2 executors")
+    print("  Memory: 512m per container")
+    print("  Example: Calculate Pi using Monte Carlo method")
+    print()
+
+    # Step 3: Submit the application
+    print("Step 3: Submitting application to Kubernetes...")
+
+    try:
+        response = client.submit_application(
+            # Application metadata
+            app_name=app_name,
+            main_application_file="local:///opt/spark/examples/src/main/python/pi.py",
+            # Spark configuration
+            spark_version="4.0.0",
+            app_type="Python",
+            # Resource allocation (small for demo)
+            driver_cores=1,
+            driver_memory="512m",
+            executor_cores=1,
+            executor_memory="512m",
+            num_executors=2,
+            # Arguments for pi calculation (number of samples)
+            arguments=["10"],  # Calculate Pi with 10 partitions
+            # Required for Spark 4.0
+            spark_conf={
+                "spark.kubernetes.file.upload.path": "/tmp",
+            },
+        )
+
+        print("  Application submitted successfully!")
+        print(f"  Submission ID: {response.submission_id}")
+        print(f"  Status: {response.status}")
+        print()
+
+    except Exception as e:
+        print(f"  ERROR: Submission failed: {e}")
+        sys.exit(1)
+
+    # Step 4: Monitor the application
+    print("Step 4: Monitoring application (this may take 1-2 minutes)...")
+    print("  Waiting for pods to start...")
+
+    try:
+        # Wait for completion with timeout
+        final_status = client.wait_for_completion(
+            submission_id=app_name,
+            timeout=300,  # 5 minutes max
+            polling_interval=5,  # Check every 5 seconds
+        )
+
+        print("  Application completed!")
+        print(f"  Final state: {final_status.state.value}")
+        print()
+
+        # Check if successful
+        if final_status.state != ApplicationState.COMPLETED:
+            print(
+                f"  WARNING: Application did not complete successfully: {final_status.state.value}"
+            )  # noqa: E501
+            print("  Check logs below for details.")
+
+    except TimeoutError:
+        print("  ERROR: Application did not complete within 5 minutes")
+        print("  You can check status later with: client.get_status('{app_name}')")
+        sys.exit(1)
+    except Exception as e:
+        print(f"  ERROR: Error monitoring application: {e}")
+        sys.exit(1)
+
+    # Step 5: Retrieve results from logs
+    print("Step 5: Retrieving application logs and results...")
+    print()
+
+    try:
+        logs = list(client.get_logs(app_name))
+
+        # Parse and display results
+        print("=" * 80)
+        print("CALCULATION RESULTS:")
+        print("=" * 80)
+
+        # Find the Pi calculation result
+        pi_found = False
+        for line in logs:
+            if "Pi is roughly" in line:
+                print(f"\n{line}\n")
+                pi_found = True
+                break
+
+        if not pi_found:
+            # Show last 20 lines if Pi result not found
+            print("Recent log lines:")
+            for line in logs[-20:]:
+                print(line)
+
+        print("=" * 80)
+
+    except Exception as e:
+        print(f"  WARNING: Could not retrieve logs: {e}")
+        print("  The job may have completed but logs are not yet available")
+
+    # Step 6: Cleanup
+    print()
+    print("Step 6: Cleaning up resources...")
+    try:
+        client.delete_application(app_name)
+        print(f"  Application '{app_name}' deleted")
+    except Exception as e:
+        print(f"  WARNING: Cleanup warning: {e}")
+        print(f"  You can manually delete with: kubectl delete sparkapplication {app_name}")
+
+    print()
+    print("=" * 80)
+    print("EXAMPLE COMPLETED SUCCESSFULLY!")
+    print("=" * 80)
+    print()
+    print("What you learned:")
+    print("  - How to create a SparkClient")
+    print("  - How to submit a PySpark application")
+    print("  - How to wait for completion")
+    print("  - How to retrieve logs")
+    print("  - How to clean up resources")
+    print()
+    print("Key SDK Methods:")
+    print("  - SparkClient(backend_config=config) - Create client")
+    print("  - client.submit_application(...) - Submit Spark job")
+    print("  - client.wait_for_completion(...) - Monitor job")
+    print("  - client.get_logs(...) - Retrieve logs")
+    print("  - client.delete_application(...) - Cleanup")
+    print()
+    print("Next steps:")
+    print("  - Try example 02: CSV data analysis")
+    print("  - Try example 03: Interactive DataFrame exploration")
+    print("  - Modify driver/executor resources")
+    print("  - Try with different Spark versions")
+    print()
+
+
+if __name__ == "__main__":
+    main()