main/python/wordcount.py

0001 #
0002 # Licensed to the Apache Software Foundation (ASF) under one or more
0003 # contributor license agreements.  See the NOTICE file distributed with
0004 # this work for additional information regarding copyright ownership.
0005 # The ASF licenses this file to You under the Apache License, Version 2.0
0006 # (the "License"); you may not use this file except in compliance with
0007 # the License.  You may obtain a copy of the License at
0008 #
0009 #    http://www.apache.org/licenses/LICENSE-2.0
0010 #
0011 # Unless required by applicable law or agreed to in writing, software
0012 # distributed under the License is distributed on an "AS IS" BASIS,
0013 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014 # See the License for the specific language governing permissions and
0015 # limitations under the License.
0016 #
0017
0018 from __future__ import print_function
0019
0020 import sys
0021 from operator import add
0022
0023 from pyspark.sql import SparkSession
0024
0025
0026 if __name__ == "__main__":
0027     if len(sys.argv) != 2:
0028         print("Usage: wordcount <file>", file=sys.stderr)
0029         sys.exit(-1)
0030
0031     spark = SparkSession\
0032         .builder\
0033         .appName("PythonWordCount")\
0034         .getOrCreate()
0035
0036     lines = spark.read.text(sys.argv[1]).rdd.map(lambda r: r[0])
0037     counts = lines.flatMap(lambda x: x.split(' ')) \
0038                   .map(lambda x: (x, 1)) \
0039                   .reduceByKey(add)
0040     output = counts.collect()
0041     for (word, count) in output:
0042         print("%s: %i" % (word, count))
0043
0044     spark.stop()