Shuiqiang,
I added the flink-connector-kafka_2-12 jar to the /opt/flink/lib directory
When submitting this job to my flink cluster I’m getting this stack trace
at runtime:
org.apache.flink.runtime.JobException: Recovery is suppressed by
NoRestartBackoffTimeStrategy
at
org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.handleFailure(ExecutionFailureHandler.java:116)
at
org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.getFailureHandlingResult(ExecutionFailureHandler.java:78)
at
org.apache.flink.runtime.scheduler.DefaultScheduler.handleTaskFailure(DefaultScheduler.java:224)
at
org.apache.flink.runtime.scheduler.DefaultScheduler.maybeHandleTaskFailure(DefaultScheduler.java:217)
at
org.apache.flink.runtime.scheduler.DefaultScheduler.updateTaskExecutionStateInternal(DefaultScheduler.java:208)
at
org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:610)
at
org.apache.flink.runtime.scheduler.SchedulerNG.updateTaskExecutionState(SchedulerNG.java:89)
at
org.apache.flink.runtime.jobmaster.JobMaster.updateTaskExecutionState(JobMaster.java:419)
at sun.reflect.GeneratedMethodAccessor71.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:286)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:201)
at
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:74)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:154)
at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)
at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)
at scala.PartialFunction.applyOrElse(PartialFunction.scala:123)
at scala.PartialFunction.applyOrElse$(PartialFunction.scala:122)
at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)
at akka.actor.Actor.aroundReceive(Actor.scala:517)
at akka.actor.Actor.aroundReceive$(Actor.scala:515)
at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:592)
at akka.actor.ActorCell.invoke(ActorCell.scala:561)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)
at akka.dispatch.Mailbox.run(Mailbox.scala:225)
at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at
akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at
akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: org.apache.flink.streaming.runtime.tasks.StreamTaskException:
Cannot load user class:
org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer
ClassLoader info: URL ClassLoader:
Class not resolvable through given classloader.
at
org.apache.flink.streaming.api.graph.StreamConfig.getStreamOperatorFactory(StreamConfig.java:322)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.createOperator(OperatorChain.java:614)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.createOperatorChain(OperatorChain.java:583)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.createOutputCollector(OperatorChain.java:526)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.<init>(OperatorChain.java:164)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:485)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:531)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:722)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:547)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException:
org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at
org.apache.flink.util.FlinkUserCodeClassLoader.loadClassWithoutExceptionHandling(FlinkUserCodeClassLoader.java:63)
at
org.apache.flink.util.ChildFirstClassLoader.loadClassWithoutExceptionHandling(ChildFirstClassLoader.java:63)
at
org.apache.flink.util.FlinkUserCodeClassLoader.loadClass(FlinkUserCodeClassLoader.java:49)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at
org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$SafetyNetWrapperClassLoader.loadClass(FlinkUserCodeClassLoaders.java:168)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at
org.apache.flink.util.InstantiationUtil$ClassLoaderObjectInputStream.resolveClass(InstantiationUtil.java:78)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1986)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1850)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2160)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1667)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2405)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2329)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2187)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1667)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2405)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2329)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2187)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1667)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:503)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:461)
at
org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:576)
at
org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:562)
at
org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:550)
at
org.apache.flink.util.InstantiationUtil.readObjectFromConfig(InstantiationUtil.java:511)
at
org.apache.flink.streaming.api.graph.StreamConfig.getStreamOperatorFactory(StreamConfig.java:310)
... 9 more
On Sat, Mar 13, 2021 at 12:13 AM Shuiqiang Chen <acqua....@gmail.com> wrote:
> Hi Robert,
>
> You can refer to
> https://github.com/apache/flink/blob/master/flink-end-to-end-tests/flink-python-test/python/datastream/data_stream_job.py
> for the whole example.
>
> Best,
> Shuiqiang
>
> Robert Cullen <cinquate...@gmail.com> 于2021年3月13日周六 上午4:01写道：
>
>> Shuiqiang, Can you include the import statements? thanks.
>>
>> On Fri, Mar 12, 2021 at 1:48 PM Shuiqiang Chen <acqua....@gmail.com>
>> wrote:
>>
>>> Hi Robert,
>>>
>>> Kafka Connector is provided in Python DataStream API since
>>> release-1.12.0. And the documentation for it is lacking, we will make it up
>>> soon.
>>>
>>> The following code shows how to apply KafkaConsumers and KafkaProducer:
>>> ```
>>> env = StreamExecutionEnvironment.get_execution_environment()
>>> env.set_parallelism(1)
>>> env.set_stream_time_characteristic(TimeCharacteristic.EventTime)
>>>
>>> # define the schema of the message from kafka, here the data is in json
>>> format.
>>> type_info = Types.ROW_NAMED(['createTime', 'orderId', 'payAmount',
>>> 'payPlatform', 'provinceId'],
>>> [Types.LONG(), Types.LONG(), Types.DOUBLE(), Types.INT(),
>>> Types.INT()])
>>> json_row_schema =
>>> JsonRowDeserializationSchema.builder().type_info(type_info).build()
>>>
>>> # define the kafka connection properties.
>>> kafka_props = {'bootstrap.servers': 'localhost:9092', 'group.id':
>>> 'pyflink-e2e-source'}
>>>
>>> # create the KafkaConsumer and KafkaProducer with the specified topic
>>> name, serialization/deserialization schema and properties.
>>> kafka_consumer = FlinkKafkaConsumer("timer-stream-source",
>>> json_row_schema, kafka_props)
>>> kafka_producer = FlinkKafkaProducer("timer-stream-sink",
>>> SimpleStringSchema(), kafka_props)
>>>
>>> # set the kafka source to consume data from earliest offset.
>>> kafka_consumer.set_start_from_earliest()
>>>
>>> # create a DataStream from kafka consumer source
>>> ds = env.add_source(kafka_consumer)
>>>
>>> result_stream = ...
>>>
>>> # write the result into kafka by a kafka producer sink.
>>> result_stream.add_sink(kafka_producer)
>>> ```
>>>
>>> Best,
>>> Shuiqiang
>>>
>>> Robert Cullen <cinquate...@gmail.com> 于2021年3月13日周六 上午12:56写道：
>>>
>>>> I’ve scoured the web looking for an example of using a Kafka source for
>>>> a DataStream in python. Can someone finish this example?
>>>>
>>>> env = StreamExecutionEnvironment.get_execution_environment()
>>>> env.set_parallelism(1)
>>>> ds = env.from_collection( KAFKA_SOURCE )
>>>> ...
>>>>
>>>> --
>>>> Robert Cullen
>>>> 240-475-4490
>>>>
>>>
>>
>> --
>> Robert Cullen
>> 240-475-4490
>>
>
--
Robert Cullen
240-475-4490
