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https://issues.apache.org/jira/browse/FLINK-10107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16665316#comment-16665316
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ASF GitHub Bot commented on FLINK-10107:
----------------------------------------
pnowojski commented on issue #6534: [FLINK-10107] [sql-client] Relocate Flink
Kafka connectors for SQL JARs
URL: https://github.com/apache/flink/pull/6534#issuecomment-433452599
@twalthr what is the problem here? Do I understand this correctly, that
different versions of `flink-kafka-connector`s conflicting with one another if
they are used/loaded at the same time? And that's potential production issue
(however a rare use case), but it's causing problems in our end-to-end tests?
If so why would this help:
> A perfect solution would be:
>
> Move version-specific Kafka code into version-specific packages (e.g.
o.a.f.kafka10)
> Move version-agnostic Kafka code into a common package (e.g. o.a.f.kafka)
?
Isn't the correct "perfect" solution to load each connector/plugin in a
separate independent class loader, isolated from others?
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> SQL Client end-to-end test fails for releases
> ---------------------------------------------
>
> Key: FLINK-10107
> URL: https://issues.apache.org/jira/browse/FLINK-10107
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Major
> Labels: pull-request-available
>
> It seems that SQL JARs for Kafka 0.10 and Kafka 0.9 have conflicts that only
> occur for releases and not SNAPSHOT builds. This might be due to their file
> name. Depending on the file name either 0.9 is loaded before 0.10 and vice
> versa.
> One of the following errors occured:
> {code}
> 2018-08-08 18:28:51,636 ERROR
> org.apache.flink.kafka09.shaded.org.apache.kafka.clients.ClientUtils -
> Failed to close coordinator
> java.lang.NoClassDefFoundError:
> org/apache/flink/kafka09/shaded/org/apache/kafka/common/requests/OffsetCommitResponse
> at
> org.apache.flink.kafka09.shaded.org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.sendOffsetCommitRequest(ConsumerCoordinator.java:473)
> at
> org.apache.flink.kafka09.shaded.org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.commitOffsetsSync(ConsumerCoordinator.java:357)
> at
> org.apache.flink.kafka09.shaded.org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.maybeAutoCommitOffsetsSync(ConsumerCoordinator.java:439)
> at
> org.apache.flink.kafka09.shaded.org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.close(ConsumerCoordinator.java:319)
> at
> org.apache.flink.kafka09.shaded.org.apache.kafka.clients.ClientUtils.closeQuietly(ClientUtils.java:63)
> at
> org.apache.flink.kafka09.shaded.org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:1277)
> at
> org.apache.flink.kafka09.shaded.org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:1258)
> at
> org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerThread.run(KafkaConsumerThread.java:286)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.flink.kafka09.shaded.org.apache.kafka.common.requests.OffsetCommitResponse
> at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> at
> org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$ChildFirstClassLoader.loadClass(FlinkUserCodeClassLoaders.java:120)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> ... 8 more
> {code}
> {code}
> java.lang.NoSuchFieldError: producer
> at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer010.invoke(FlinkKafkaProducer010.java:369)
> at
> org.apache.flink.streaming.api.operators.StreamSink.processElement(StreamSink.java:56)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
> 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$CountingOutput.collect(AbstractStreamOperator.java:689)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:667)
> at
> org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:41)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$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:689)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:667)
> at
> org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:51)
> at
> org.apache.flink.table.runtime.CRowWrappingCollector.collect(CRowWrappingCollector.scala:37)
> at
> org.apache.flink.table.runtime.CRowWrappingCollector.collect(CRowWrappingCollector.scala:28)
> {code}
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