| # |
| # 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. |
| # |
| |
| import sys |
| import time |
| |
| from pyspark.sql import SparkSession |
| |
| |
| if __name__ == "__main__": |
| """ |
| Usage: decommissioning |
| """ |
| print("Starting decom test") |
| spark = SparkSession \ |
| .builder \ |
| .appName("DecomTest") \ |
| .getOrCreate() |
| sc = spark._sc |
| acc = sc.accumulator(0) |
| |
| def addToAcc(x): |
| acc.add(1) |
| return x |
| |
| initialRdd = sc.parallelize(range(100), 5) |
| accRdd = initialRdd.map(addToAcc) |
| # Trigger a shuffle so there are shuffle blocks to migrate |
| rdd = accRdd.map(lambda x: (x, x)).groupByKey() |
| # Make enough shuffle files to increase the chance of the race condition. |
| for i in range(1, 2): |
| shuffleRdd = sc.parallelize(range(1, 10), 5).map(lambda x: (x, x)).groupByKey() |
| shuffleRdd.collect() |
| rdd.collect() |
| print("1st accumulator value is: " + str(acc.value)) |
| print("Waiting to give nodes time to finish migration, decom exec 1.") |
| print("...") |
| time.sleep(30) |
| rdd.count() |
| rdd.collect() |
| print("Final accumulator value is: " + str(acc.value)) |
| print("Finished waiting, stopping Spark.") |
| spark.stop() |
| print("Done, exiting Python") |
| sys.exit(0) |
