problem:when i run the code in spark environment,it alway error:Exception: Java gateway process exited before sending its port number!
it takes me a long time to solve,finally a man in google who also encountered with the same problem like me says the errror is cause by anaconda,better to uninstall anaconda.I did not take his advice at beginning.but i could not find any solutions to it.so i just do the following steps:
1.uninstall anaconda
2.remove the path i added in pycarm(Run-edit configurations-environment variables)
3.change the strange name i i use in the py file like 1,2,3 to a normal name
Finnally,my code run successfully in spark enviroment.Here is the my code:
start_time = time.time()
password = parse.quote_plus('Goe@spider')
uri = "mongodb://gouuse:{}@192.168.5.113:27017/Flight.test".format(password)
# mongdb 连接参数
input_uri = "mongodb://username:[email protected]:27017/Flight"
database = "Flight"
collection = "info"
spark = SparkSession.builder.master('local[*]').appName("read").getOrCreate()
mongdbDf = spark.read.format('com.mongodb.spark.sql').options(fetchsize=1000,uri=input_uri,database=database,collection=collection).load()
mongdbDf.printSchema()
mongdbDf.show() #默认显示20行
print('before delete the duplicated:')
print(mongdbDf.count())
mongdbDf.registerTempTable("temp_table")
# mngDF = mongdbDf.dropDuplicates(['customer_name','website']) # 去重
mngDF = mongdbDf.dropDuplicates(['customer_name']) # 去重
mngDF.write.format("com.mongodb.spark.sql.DefaultSource").mode("append").option("spark.mongodb.output.uri", uri).save()
time_inv = time.time()-start_time
print("************************************")
print(time_inv)
print('after delete the duplicated:')
print(mngDF.count())
mngDF.show()