| # |
| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You under the Apache License, Version 2.0 |
| # (the "License"); you may not use this file except in compliance with |
| # the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| |
| from __future__ import print_function |
| |
| import sys |
| from random import random |
| from operator import add |
| |
| from livy.client import HttpClient |
| |
| if __name__ == "__main__": |
| """ |
| Usage: pi_app [livy url] [slices] |
| |
| To run this Python script you need to install livy-python-api-*version*.tar.gz with |
| easy_install first. |
| |
| python /pathTo/pi_app.py http://<livy-server>:8998 2 |
| """ |
| |
| if len(sys.argv) != 3: |
| print("Usage: pi_app <livy url> <slices>", file=sys.stderr) |
| exit(-1) |
| |
| slices = int(sys.argv[2]) |
| samples = 100000 * slices |
| |
| client = HttpClient(sys.argv[1]) |
| |
| def f(_): |
| x = random() * 2 - 1 |
| y = random() * 2 - 1 |
| return 1 if x ** 2 + y ** 2 <= 1 else 0 |
| |
| def pi_job(context): |
| count = context.sc.parallelize(range(1, samples + 1), slices).map(f).reduce(add) |
| return 4.0 * count / samples |
| |
| pi = client.submit(pi_job).result() |
| |
| print("Pi is roughly %f" % pi) |
| client.stop(True) |
| |