pyspark mongoDB连接器问题

Question

我使用的是spark-2.1.0-bin-hadoop2.7、Scala 2.11.8和python3.5。在

对于spark mongo连接器，我使用的是来自http://repo1.maven.org/maven2/org/mongodb/spark/mongo-spark-connector_2.11/2.0.0/的“mongo-spark-connector_2.11-2.0.0.jar”

现在，将jar放入../spark-2.1.0-bin-hadoop2.7/jars路径后，我将启动./pyspark，如下所示：mongodoc官方站点https://docs.mongodb.com/spark-connector/master/python-api/#tutorials

./bin/pyspark --conf "spark.mongodb.input.uri=mongodb://127.0.0.1/test.myCollection?readPreference=primaryPreferred" 
          --conf "spark.mongodb.output.uri=mongodb://127.0.0.1/test.myCollection" \
          --packages org.mongodb.spark:mongo-spark-connector_2.11:2.0.0

一切都很好，我的sparksession对象是spark。在

现在，当我试图将一个集合加载到数据帧中时

^{pr2}$

我得到了这个错误：

py4j.protocol.Py4JJavaError: An error occurred while calling o36.load.
: java.lang.NoClassDefFoundError: com/mongodb/ConnectionString
    at com.mongodb.spark.config.MongoCompanionConfig$$anonfun$4.apply(MongoCompanionConfig.scala:278)
    at com.mongodb.spark.config.MongoCompanionConfig$$anonfun$4.apply(MongoCompanionConfig.scala:278)
    at scala.util.Try$.apply(Try.scala:192)
    at com.mongodb.spark.config.MongoCompanionConfig$class.connectionString(MongoCompanionConfig.scala:278)
    at com.mongodb.spark.config.ReadConfig$.connectionString(ReadConfig.scala:39)
    at com.mongodb.spark.config.ReadConfig$.apply(ReadConfig.scala:51)
    at com.mongodb.spark.config.ReadConfig$.apply(ReadConfig.scala:39)
    at com.mongodb.spark.config.MongoCompanionConfig$class.apply(MongoCompanionConfig.scala:124)
    at com.mongodb.spark.config.ReadConfig$.apply(ReadConfig.scala:39)
    at com.mongodb.spark.config.MongoCompanionConfig$class.apply(MongoCompanionConfig.scala:113)
    at com.mongodb.spark.config.ReadConfig$.apply(ReadConfig.scala:39)
    at com.mongodb.spark.sql.DefaultSource.createRelation(DefaultSource.scala:67)
    at com.mongodb.spark.sql.DefaultSource.createRelation(DefaultSource.scala:50)
    at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:330)
    at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:152)
    at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:125)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
    at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
    at py4j.Gateway.invoke(Gateway.java:280)
    at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
    at py4j.commands.CallCommand.execute(CallCommand.java:79)
    at py4j.GatewayConnection.run(GatewayConnection.java:214)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: com.mongodb.ConnectionString
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 27 more

我就是不明白：我做错了什么，我错过了什么

-我需要添加任何依赖的jar吗

-或者此连接器仅适用于2.0.x，而不适用于spark2.1.0（从未在spark2.0.x上尝试过）

• 如果在mongoDB上有一个授权，那么我的uri会是什么样子呢

-因为它显示了connectionString，但我已经重新检查了100次（在pymongo连接url中也是如此）。在

—也对会话生成器对象尝试了相同的方法，但没有结果

from pyspark.sql import SparkSession

my_spark = SparkSession \
.builder \
.appName("myApp") \
.config("spark.mongodb.input.uri", "mongodb://127.0.0.1/test.coll") \
.config("spark.mongodb.output.uri", "mongodb://127.0.0.1/test.coll") \
.getOrCreate()

请帮我解决这个问题。提前谢谢。在

Answer 1

它与spark2.1.x兼容，很难在类路径中包括mongodbjava驱动程序以及连接器。编辑spark-defaults.conf，使其包含必要的jar文件：

spark.driver.extraClassPath /opt/mongo-spark-connector_2.11-2.0.0.jar,/opt/mongo-java-driver-3.2.2.jar
spark.executor.extraClassPath /opt/mongo-spark-connector_2.11-2.0.0.jar,/opt/mongo-java-driver-3.2.2.jar
spark.driver.extraLibraryPath /opt/mongo-spark-connector_2.11-2.0.0.jar,/opt/mongo-java-driver-3.2.2.jar
spark.executor.extraLibraryPath /opt/mongo-spark-connector_2.11-2.0.0.jar,/opt/mongo-java-driver-3.2.2.jar

Answer 2

我也有同样的问题。在

mongospark连接器似乎只在python2.x中工作，一旦我从3.5改为2.7，mongodb的数据就不会出现问题。在