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apache-spark - 从 Kafka 读取时 Pyspark 结构化流中的异常

问题描述

环境：Spark 2.4.0

我已经包含了 spark-sql-kafka-0-10 jar，它与我使用的 Spark 版本相同。

这是一个例外：

py4j.protocol.Py4JJavaError: An error occurred while calling o38.load.
: java.lang.NoClassDefFoundError: org.apache.kafka.common.serialization.ByteArrayDeserializer
    at org.apache.spark.sql.kafka010.KafkaSourceProvider$.<init>(KafkaSourceProvider.scala:487)
    at org.apache.spark.sql.kafka010.KafkaSourceProvider$.<clinit>(KafkaSourceProvider.scala)
    at org.apache.spark.sql.kafka010.KafkaSourceProvider.validateStreamOptions(KafkaSourceProvider.scala:414)
    at org.apache.spark.sql.kafka010.KafkaSourceProvider.sourceSchema(KafkaSourceProvider.scala:66)
    at org.apache.spark.sql.execution.datasources.DataSource.sourceSchema(DataSource.scala:209)
    at org.apache.spark.sql.execution.datasources.DataSource.sourceInfo$lzycompute(DataSource.scala:95)
    at org.apache.spark.sql.execution.datasources.DataSource.sourceInfo(DataSource.scala:95)
    at org.apache.spark.sql.execution.streaming.StreamingRelation$.apply(StreamingRelation.scala:33)
    at org.apache.spark.sql.streaming.DataStreamReader.load(DataStreamReader.scala:171)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
    at java.lang.reflect.Method.invoke(Method.java:508)
    at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
    at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
    at py4j.Gateway.invoke(Gateway.java:282)
    at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
    at py4j.commands.CallCommand.execute(CallCommand.java:79)
    at py4j.GatewayConnection.run(GatewayConnection.java:238)
    at java.lang.Thread.run(Thread.java:812)
Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.serialization.ByteArrayDeserializer
    at java.net.URLClassLoader.findClass(URLClassLoader.java:610)
    at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:937)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:882)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:343)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:865)
    ... 20 more

标签： apache-sparkpysparkapache-kafkaspark-structured-streaming

解决方案

我的类路径中没有kafka-clients jar。添加它修复了缺少的类异常

使用 packages 选项启动 spark-shell 也可以：

spark-shell --packages org.apache.spark:spark-sql-kafka-0-10_2.11:2.4.0

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