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From Alexander Smirnov <alexander.smirn...@gmail.com>
Subject Kafka exceptions in Flink log file
Date Mon, 02 Apr 2018 11:32:48 GMT
I see a lot of messages in flink log like below. What's the cause?


02 Apr 2018 04:09:13,554 ERROR
org.apache.kafka.clients.producer.internals.Sender - Uncaught error in
kafka producer I/O thread:
org.apache.kafka.common.KafkaException: Error registering mbean
kafka.producer:type=producer-node-metrics,client-id=producer-1,node-id=node-1
        at
org.apache.kafka.common.metrics.JmxReporter.reregister(JmxReporter.java:163)
        at
org.apache.kafka.common.metrics.JmxReporter.metricChange(JmxReporter.java:81)
        at
org.apache.kafka.common.metrics.Metrics.registerMetric(Metrics.java:504)
        at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:255)
        at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:240)
        at
org.apache.kafka.common.network.Selector$SelectorMetrics.maybeRegisterConnectionMetrics(Selector.java:811)
        at
org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:353)
        at org.apache.kafka.common.network.Selector.poll(Selector.java:326)
        at
org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:433)
        at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:224)
        at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:162)
        at java.lang.Thread.run(Thread.java:748)
Caused by: javax.management.InstanceAlreadyExistsException:
kafka.producer:type=producer-node-metrics,client-id=producer-1,node-id=node-1
        at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
        at
com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
        at
org.apache.kafka.common.metrics.JmxReporter.reregister(JmxReporter.java:161)
        ... 11 more
02 Apr 2018 04:09:13,673 ERROR org.apache.kafka.common.utils.KafkaThread -
Uncaught exception in kafka-producer-network-thread | producer-3:
java.lang.NoClassDefFoundError: org/apache/kafka/clients/NetworkClient$1
        at
org.apache.kafka.clients.NetworkClient.processDisconnection(NetworkClient.java:583)
        at
org.apache.kafka.clients.NetworkClient.handleDisconnections(NetworkClient.java:705)
        at
org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:443)
        at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:224)
        at
org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:162)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException:
org.apache.kafka.clients.NetworkClient$1
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at
org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$ChildFirstClassLoader.loadClass(FlinkUserCodeClassLoaders.java:128)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 6 more


Thank you,
Alex

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