[jira] [Updated] (BEAM-11862) Write To Kafka does not work

["Kenneth Knowles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-11862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kenneth Knowles updated BEAM-11862:
-----------------------------------
    Fix Version/s: 2.29.0

> Write To Kafka does not work
> ----------------------------
>
>                 Key: BEAM-11862
>                 URL: https://issues.apache.org/jira/browse/BEAM-11862
>             Project: Beam
>          Issue Type: Bug
>          Components: io-py-kafka
>    Affects Versions: 2.28.0
>            Reporter: Dénes Bartha
>            Priority: P1
>             Fix For: 2.29.0
>
>
> I am trying to send data to a Kafka topic in Python using {{WriteToKafka}} via Apache Beam using Dataflow as a runner.
> By running the following script:
> {code:java}
> with beam.Pipeline(options=beam_options) as p:
>         (p
>         | beam.Impulse()
>         | beam.Map(lambda input: (1, input))
>         | WriteToKafka(
>                     producer_config={
>                         'bootstrap.servers': 'ip:9092,',
>                     },
>                     topic='testclient',
>                     key_serializer='org.apache.kafka.common.serialization.LongSerializer',
>                     value_serializer='org.apache.kafka.common.serialization.ByteArraySerializer',
>                 )
>          )
> {code}
> I am getting this error:
>  
> {code:java}
> Traceback (most recent call last):
>  File "/home/denes/data-science/try_write_to_kafka.py", line 75, in <module>
>  run_pipeline(beam_options)
>  File "/home/denes/data-science/try_write_to_kafka.py", line 38, in run_pipeline
>  (p
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 582, in _exit_
>  self.result = self.run()
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 529, in run
>  return Pipeline.from_runner_api(
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 904, in from_runner_api
>  p.transforms_stack = [context.transforms.get_by_id(root_transform_id)]
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/runners/pipeline_context.py", line 115, in get_by_id
>  self._id_to_obj[id] = self._obj_type.from_runner_api(
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 1259, in from_runner_api
>  part = context.transforms.get_by_id(transform_id)
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/runners/pipeline_context.py", line 115, in get_by_id
>  self._id_to_obj[id] = self._obj_type.from_runner_api(
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 1259, in from_runner_api
>  part = context.transforms.get_by_id(transform_id)
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/runners/pipeline_context.py", line 115, in get_by_id
>  self._id_to_obj[id] = self._obj_type.from_runner_api(
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 1259, in from_runner_api
>  part = context.transforms.get_by_id(transform_id)
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/runners/pipeline_context.py", line 115, in get_by_id
>  self._id_to_obj[id] = self._obj_type.from_runner_api(
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 1259, in from_runner_api
>  part = context.transforms.get_by_id(transform_id)
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/runners/pipeline_context.py", line 115, in get_by_id
>  self._id_to_obj[id] = self._obj_type.from_runner_api(
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 1236, in from_runner_api
>  transform = ptransform.PTransform.from_runner_api(proto, context)
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/transforms/ptransform.py", line 700, in from_runner_api
>  return constructor(
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/transforms/core.py", line 1419, in from_runner_api_parameter
>  DoFnInfo.from_runner_api(
>  File "/home/denes/data-science/venv/lib/python3.8/site-packages/apache_beam/transforms/core.py", line 1493, in from_runner_api
>  raise ValueError('Unexpected DoFn type: %s' % spec.urn)
>  ValueError: Unexpected DoFn type: beam:dofn:javasdk:0.1
> {code}
>  
> If I am not wrong, the problem is with the serialization methods. I have tried all sorts of combinations that I have found on [this|https://kafka.apache.org/26/javadoc/org/apache/kafka/common/serialization/] page.
> When I do not specify the serializers then I get this error: {{RuntimeError:}}
> {code:java}
> Traceback (most recent call last):Traceback (most recent call last):  File "/home/denes/data-science/try_write_to_kafka.py", line 48, in <module>    run_pipeline(beam_options)  File "/home/denes/data-science/try_write_to_kafka.py", line 14, in run_pipeline    WriteToKafka(  File "/home/denes/beam_kafka/venv/lib/python3.8/site-packages/apache_beam/pvalue.py", line 141, in __or__    return self.pipeline.apply(ptransform, self)  File "/home/denes/beam_kafka/venv/lib/python3.8/site-packages/apache_beam/pipeline.py", line 689, in apply    pvalueish_result = self.runner.apply(transform, pvalueish, self._options)  File "/home/denes/beam_kafka/venv/lib/python3.8/site-packages/apache_beam/runners/runner.py", line 188, in apply    return m(transform, input, options)  File "/home/denes/beam_kafka/venv/lib/python3.8/site-packages/apache_beam/runners/runner.py", line 218, in apply_PTransform    return transform.expand(input)  File "/home/denes/beam_kafka/venv/lib/python3.8/site-packages/apache_beam/transforms/external.py", line 318, in expand    raise RuntimeError(response.error)RuntimeError: java.lang.ClassCastException: class org.apache.beam.sdk.coders.VarLongCoder cannot be cast to class org.apache.beam.sdk.coders.KvCoder (org.apache.beam.sdk.coders.VarLongCoder and org.apache.beam.sdk.coders.KvCoder are in unnamed module of loader 'app') at org.apache.beam.sdk.io.kafka.KafkaIO$Write.expand(KafkaIO.java:2295) at org.apache.beam.sdk.io.kafka.KafkaIO$Write.expand(KafkaIO.java:2088) at org.apache.beam.sdk.Pipeline.applyInternal(Pipeline.java:547) at org.apache.beam.sdk.Pipeline.applyTransform(Pipeline.java:498) at org.apache.beam.sdk.expansion.service.ExpansionService$TransformProvider.apply(ExpansionService.java:360) at org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:436) at org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:491) at org.apache.beam.model.expansion.v1.ExpansionServiceGrpc$MethodHandlers.invoke(ExpansionServiceGrpc.java:232) at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:172) at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:331) at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:817) at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37) at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834)
> {code}
> {{Note that I have installed the latest apache-beam version  via `pip install 'apache-beam'`}}.
> apache-beam==2.28.0



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