python spark streaming单机测试,streaming源为本地,统计word count

网上有很多pyspark streaming的测试代码,不过大多都是需要结合kafka做消息来源

由于懒得搭kafka,所以想本地生成随机数据作为streaming源,测试spark streaming

 

google查了一些文章,其实spark github中就有类似代码,只不过文件名叫 hdfs_wordcount.py,是针对hdfs的example

https://github.com/apache/spark/blob/master/examples/src/main/python/streaming/hdfs_wordcount.py

参考这个代码来自己测试

 

环境:

hostip:192.168.1.20

spark standalone

 

代码:

"""

Filename: test_spark_streaming.py

Author: Si Yu

Date: 01/03/2019

"""

from __future__ import print_function



import sys



from pyspark import SparkContext

from pyspark.streaming import StreamingContext



if __name__ == "__main__":

    LOCALDIR = "/tmp/testfiles"



    sc = SparkContext(master="spark://192.168.1.20:7077", appName="PythonStreamingLocalFilesWordCount")

    ssc = StreamingContext(sc, 10)



    lines = ssc.textFileStream(LOCALDIR)



    words = lines.flatMap(lambda line: line.split(" "))

    pairs = words.map(lambda word: (word, 1))

    wordCounts = pairs.reduceByKey(lambda x, y: x+y)



    wordCounts.pprint()



    ssc.start()

    ssc.awaitTermination()

 

注意:

启动程序后,文件夹中的新文件才会被streaming捕获到,开始试了半天没反应,最后才发现

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