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+#
+# 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.
+#
+
+"""
+ Counts words in UTF8 encoded, '\n' delimited text received from the network every second.
+ Usage: network_wordcount.py <hostname> <port>
+ <hostname> and <port> describe the TCP server that Spark Streaming would connect to receive data.
+
+ To run this on your local machine, you need to first run a Netcat server
+ `$ nc -lk 9999`
+ and then run the example
+ `$ bin/spark-submit examples/src/main/python/streaming/network_wordcount.py localhost 9999`
+"""
+
+import sys
+
+from pyspark import SparkContext
+from pyspark.streaming import StreamingContext
+
+if __name__ == "__main__":
+ if len(sys.argv) != 3:
+ print >> sys.stderr, "Usage: network_wordcount.py <hostname> <port>"
+ exit(-1)
+ sc = SparkContext(appName="PythonStreamingNetworkWordCount")
+ ssc = StreamingContext(sc, 1)
+
+ lines = ssc.socketTextStream(sys.argv[1], int(sys.argv[2]))
+ counts = lines.flatMap(lambda line: line.split(" "))\
+ .map(lambda word: (word, 1))\
+ .reduceByKey(lambda a, b: a+b)
+ counts.pprint()
+
+ ssc.start()
+ ssc.awaitTermination()