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https://issues.apache.org/jira/browse/FLINK-8093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17267686#comment-17267686
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Alexey Trenikhin commented on FLINK-8093:
-----------------------------------------
Same issue with Flink 1.12
> flink job fail because of kafka producer create fail of
> "javax.management.InstanceAlreadyExistsException"
> ---------------------------------------------------------------------------------------------------------
>
> Key: FLINK-8093
> URL: https://issues.apache.org/jira/browse/FLINK-8093
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.3.2, 1.10.0
> Environment: flink 1.3.2, kafka 0.9.1
> Reporter: dongtingting
> Assignee: Bastien DINE
> Priority: Critical
> Labels: usability
>
> one taskmanager has multiple taskslot, one task fail because of create
> kafkaProducer fail，the reason for create kafkaProducer fail is
> “javax.management.InstanceAlreadyExistsException:
> kafka.producer:type=producer-metrics,client-id=producer-3”。 the detail trace
> is ：
> {noformat}
> 2017-11-04 19:41:23,281 INFO org.apache.flink.runtime.taskmanager.Task
> - Source: Custom Source -> Filter -> Map -> Filter -> Sink:
> dp_client_**_log (7/80) (99551f3f892232d7df5eb9060fa9940c) switched from
> RUNNING to FAILED.
> org.apache.kafka.common.KafkaException: Failed to construct kafka producer
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:321)
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:181)
> at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducerBase.getKafkaProducer(FlinkKafkaProducerBase.java:202)
> at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducerBase.open(FlinkKafkaProducerBase.java:212)
> at
> org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
> at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:111)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:375)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:252)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.kafka.common.KafkaException: Error registering mbean
> kafka.producer:type=producer-metrics,client-id=producer-3
> at
> org.apache.kafka.common.metrics.JmxReporter.reregister(JmxReporter.java:159)
> at
> org.apache.kafka.common.metrics.JmxReporter.metricChange(JmxReporter.java:77)
> at
> org.apache.kafka.common.metrics.Metrics.registerMetric(Metrics.java:288)
> at org.apache.kafka.common.metrics.Metrics.addMetric(Metrics.java:255)
> at org.apache.kafka.common.metrics.Metrics.addMetric(Metrics.java:239)
> at
> org.apache.kafka.clients.producer.internals.RecordAccumulator.registerMetrics(RecordAccumulator.java:137)
> at
> org.apache.kafka.clients.producer.internals.RecordAccumulator.<init>(RecordAccumulator.java:111)
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:261)
> ... 9 more
> Caused by: javax.management.InstanceAlreadyExistsException:
> kafka.producer:type=producer-metrics,client-id=producer-3
> 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:157)
> ... 16 more
> {noformat}
> I doubt that task in different taskslot of one taskmanager use different
> classloader， and taskid may be the same in one process。 So this lead to
> create kafkaProducer fail in one taskManager。
> Does anybody encountered the same problem？
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