Rdd转DataFrame
from pyspark.sql.types import *
from pyspark import SparkContext,SparkConf
from pyspark.sql import SparkSession
spark=SparkSession.builder.appName("boye").getOrCreate()
sc = spark.sparkContext
textFile = sc.textFile("file:///usr/local/test/urls")
rdd = textFile.map(lambda x:x.split("\t")).filter(lambda x:len(x)==2)
df = spark.createDataFrame(rdd,schema=["rowkey","url"])
df.write.format("json").mode("overwrite").save("file:///usr/local/test/outPut") #保存数据
df.write.save(path='/usr/local/test/csv', format='csv', mode='overwrite', sep='\t') #保存为csv文件
df.write.mode("overwrite").saveAsTable("ss") #永久保存
DataFrame转Rdd
1 from pyspark import SparkContext,SparkConf
2 from pyspark.sql import SparkSession
3 spark=SparkSession.builder.appName("boye").getOrCreate()
4 sc = spark.sparkContext
5 df = spark.read.json("file:///usr/local/test/01.json")
6 rdd = df.select("name","age").limit(10).rdd
7 rdd = rdd.map(lambda d:"{}\t{}".format(d.name,d.age) )
8 rdd.saveAsTextFile("file:///usr/local/test/rdd_json")
9 #rdd.repartition(1).saveAsTextFile("file:///usr/local/test/rdd1")
