[
https://issues.apache.org/jira/browse/BEAM-7029?focusedWorklogId=286547&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-286547
]
ASF GitHub Bot logged work on BEAM-7029:
----------------------------------------
Author: ASF GitHub Bot
Created on: 01/Aug/19 08:49
Start Date: 01/Aug/19 08:49
Worklog Time Spent: 10m
Work Description: manuelaguilar commented on issue #8251: [BEAM-7029] Add
KafkaIO.Read as external transform
URL: https://github.com/apache/beam/pull/8251#issuecomment-516928565
@mxm I've been trying to use the ReadFromKafka transform (kafka.py) via
Flink with the portable runner, but it seems the value coder resolves to
ByteArrayCoder instead of KafkaRecordCoder. Am I missing a registration step?
My transform is similar to the one in the unit test (flink_runner_test.py).
Here are some logs with some extra INFO I added:
```
[Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(1/4)] INFO org.apache.beam.sdk.coders.LengthPrefixCoder - Creating length
prefix coder with value coder class org.apache.beam.sdk.coders.ByteArrayCoder
[grpc-default-executor-1] INFO org.apache.beam.fn.harness.FnHarness - Fn
Harness started
[grpc-default-executor-1] INFO org.apache.beam.fn.harness.FnHarness -
Entering instruction processing loop
[Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(2/4)] INFO org.apache.beam.runners.core.construction.CoderTranslators -
Getting length prefix coder for type class
org.apache.beam.sdk.coders.ByteArrayCoder
[Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(2/4)] INFO org.apache.beam.sdk.coders.LengthPrefixCoder - Creating length
prefix coder with value coder class org.apache.beam.sdk.coders.ByteArrayCoder
[Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(3/4)] INFO org.apache.beam.runners.core.construction.CoderTranslators -
Getting length prefix coder for type class
org.apache.beam.sdk.coders.ByteArrayCoder
[Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(3/4)] INFO org.apache.beam.sdk.coders.LengthPrefixCoder - Creating length
prefix coder with value coder class org.apache.beam.sdk.coders.ByteArrayCoder
[Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(4/4)] INFO org.apache.beam.sdk.coders.LengthPrefixCoder - Creating length
prefix coder with value coder class org.apache.beam.sdk.coders.ByteArrayCoder
...
[Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(4/4)] INFO org.apache.beam.sdk.coders.LengthPrefixCoder - Encoding value of
type class org.apache.beam.sdk.io.kafka.KafkaRecord with coder of type class
org.apache.beam.sdk.coders.ByteArrayCoder
[pool-13-thread-1] INFO org.apache.beam.sdk.io.kafka.KafkaUnboundedSource -
Reader-3: Returning from consumer pool loop
[Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(4/4)] INFO org.apache.flink.runtime.taskmanager.Task - Source: Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/KafkaIO.Read/Read(KafkaUnboundedSource)
-> Flat Map -> [1]Read From
Kafka/ExternalTransform(beam:external:java:kafka:read:v1)/Remove Kafka Metadata
(4/4) (6eabba22b9485eeaf271d72fffdc08b1) switched from RUNNING to FAILED.
java.lang.ClassCastException: org.apache.beam.sdk.io.kafka.KafkaRecord
cannot be cast to [B
at
org.apache.beam.sdk.coders.ByteArrayCoder.encode(ByteArrayCoder.java:44)
at
org.apache.beam.sdk.coders.LengthPrefixCoder.encode(LengthPrefixCoder.java:66)
at
org.apache.beam.sdk.values.ValueWithRecordId$ValueWithRecordIdCoder.encode(ValueWithRecordId.java:112)
at
org.apache.beam.sdk.values.ValueWithRecordId$ValueWithRecordIdCoder.encode(ValueWithRecordId.java:87)
at
org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.encode(WindowedValue.java:537)
at
org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.encode(WindowedValue.java:486)
at
org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:82)
at
org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:66)
at
org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:51)
at org.apache.beam.sdk.util.CoderUtils.clone(CoderUtils.java:141)
at
org.apache.beam.runners.flink.translation.types.CoderTypeSerializer.copy(CoderTypeSerializer.java:89)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:577)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$ManualWatermarkContext.processAndCollectWithTimestamp(StreamSourceContexts.java:310)
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$WatermarkContext.collectWithTimestamp(StreamSourceContexts.java:409)
at
org.apache.beam.runners.flink.translation.wrappers.streaming.io.UnboundedSourceWrapper.emitElement(UnboundedSourceWrapper.java:334)
at
org.apache.beam.runners.flink.translation.wrappers.streaming.io.UnboundedSourceWrapper.run(UnboundedSourceWrapper.java:239)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:93)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:57)
at
org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:97)
at
org.apache.flink.streaming.runtime.tasks.StoppableSourceStreamTask.run(StoppableSourceStreamTask.java:45)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
at java.lang.Thread.run(Thread.java:748)
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 286547)
Time Spent: 14h (was: 13h 50m)
> Support KafkaIO to be configured externally for use with other SDKs
> -------------------------------------------------------------------
>
> Key: BEAM-7029
> URL: https://issues.apache.org/jira/browse/BEAM-7029
> Project: Beam
> Issue Type: New Feature
> Components: io-java-kafka, runner-flink, sdk-py-core
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: Major
> Fix For: 2.13.0
>
> Time Spent: 14h
> Remaining Estimate: 0h
>
> As of BEAM-6730, we can externally configure existing transforms from SDKs.
> We should add more useful transforms then just {{GenerateSequence}}.
> {{KafkaIO}} is a good candidate.
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