path: root/python/examples/sort.py

#
# 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
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# distributed under the License is distributed on an "AS IS" BASIS,
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import sys

from pyspark import SparkContext


if __name__ == "__main__":
    if len(sys.argv) < 3:
        print >> sys.stderr, "Usage: sort <master> <file>"
        exit(-1)
    sc = SparkContext(sys.argv[1], "PythonSort")
    lines = sc.textFile(sys.argv[2], 1)
    sortedCount = lines.flatMap(lambda x: x.split(' ')) \
                  .map(lambda x: (int(x), 1)) \
                  .sortByKey(lambda x: x)
    # This is just a demo on how to bring all the sorted data back to a single node.
    # In reality, we wouldn't want to collect all the data to the driver node.
    output = sortedCount.collect()
    for (num, unitcount) in output:
        print num