消耗kafka主题时出现ClassNotFoundException:org.apache.flink.streaming.api.checkpoint.CheckpointNotifier

Question

我使用的是最新的Flink-1.1.2-Hadoop-27和flink-connector-kafka-0.10.2-hadoop1罐子.

Flink消费者如下:

StreamExecutionEnvironment env=StreamExecutionEnvironment.getExecutionEnvironment();
        if (properties == null) {
            properties = new Properties();
            InputStream props = Resources.getResource(KAFKA_CONFIGURATION_FILE).openStream();
            properties.load(props);

            DataStream<String> stream = env.addSource(new FlinkKafkaConsumer082<>(KAFKA_SIP_TOPIC, new SimpleStringSchema() , properties));

以下是执行后得到的异常:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/flink/streaming/api/checkpoint/CheckpointNotifier
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.bt.oss.voice.main.FlnkConsumer.main(FlnkConsumer.java:50)Caused by: java.lang.ClassNotFoundException: org.apache.flink.streaming.api.checkpoint.CheckpointNotifier
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 25 more

Answer 1

你正在混合版本.Flink 0.10.2的Kafka消费者不能使用Flink 1.1.2.

您应该使用Flink 1.1.2提供的Kafka连接器并包含以下Maven依赖项:

<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-connector-kafka-0.8_2.10</artifactId>
  <version>1.1.2</version>
</dependency>

有关详细信息,请查看文档.