Spark 集成开发

WordCount.py

# coding:utf-8
from pyspark import SparkContext
from pyspark import SparkConf

def SetLogger(sc):
    """设置不要显示过多信息"""
    logger = sc._jvm.org.apache.log4j
    logger.LogManager.getLogger("org").setLevel(logger.Level.ERROR)
    logger.LogManager.getLogger("akka").setLevel(logger.Level.ERROR)
    logger.LogManager.getRootLogger().setLevel(logger.Level.ERROR)

def CreateSparkContext():
    sparkConf = SparkConf().setAppName("WordCounts").set("spark.ui.showConsoleProgress","false")
    sc = SparkContext(conf=sparkConf)
    print("master=",sc.master)
    SetLogger(sc)
    return sc

def main():
    print("开始执行")
    sc = CreateSparkContext()
    textFile = sc.textFile("file:/root/ipynotebook/test.txt") # 本地文件
    # textFile = sc.textFile("hdfs://master:9000/user/hadoop/test.txt") # hdfs文件
    stringRDD = textFile.flatMap(lambda x: x.split(" "))
    # print(stringRDD.collect())
    countsRDD = stringRDD.map(lambda word: (word, 1)).reduceByKey(lambda x, y: x + y)
    print("开始保存")
    countsRDD.saveAsTextFile("file:/root/ipynotebook/output")
    # countsRDD.saveAsTextFile("hdfs://master:9000/user/hadoop/output")
    sc.stop()

if __name__ == "__main__":
    main()

　　

使用spark-submit执行命令

# 本地
$ spark-submit --master local WordCount.py
$ cat /output/part-00000 # part文件数取决于实例数

# yarn
$ spark-submit --master yarn WordCount.py
$ hadoop fs -cat /user/hadoop/output/part-00000

　　

Hadoop Web界面

http://master:8088/