[FLINK-20350] Incompatible Connectors due to Guava conflict

• Type: Bug
• Status: Open
• Priority: Not a Priority
• Resolution: Unresolved
• Affects Version/s: 1.11.1, 1.11.2
• Component/s: Connectors / Google Cloud PubSub, Connectors / Kinesis
• Labels: auto-deprioritized-major auto-deprioritized-minor stale-assigned
• Assignee: Samrat Deb
• Reporter: Danny Cranmer
• Created: 25/Nov/20 15:40
• Updated: 18/Aug/23 22:35

Description

Problem
Kinesis and GCP PubSub connector do not work together. The following error is thrown.

java.lang.NoClassDefFoundError: Could not initialize class io.grpc.netty.shaded.io.grpc.netty.NettyChannelBuilder
	at org.apache.flink.streaming.connectors.gcp.pubsub.DefaultPubSubSubscriberFactory.getSubscriber(DefaultPubSubSubscriberFactory.java:52) ~[flink-connector-gcp-pubsub_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.streaming.connectors.gcp.pubsub.PubSubSource.createAndSetPubSubSubscriber(PubSubSource.java:213) ~[flink-connector-gcp-pubsub_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.streaming.connectors.gcp.pubsub.PubSubSource.open(PubSubSource.java:102) ~[flink-connector-gcp-pubsub_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36) ~[flink-core-1.11.1.jar:1.11.1]
	at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102) ~[flink-streaming-java_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:291) ~[flink-streaming-java_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$beforeInvoke$0(StreamTask.java:473) ~[flink-streaming-java_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.runThrowing(StreamTaskActionExecutor.java:92) ~[flink-streaming-java_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:469) ~[flink-streaming-java_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:522) ~[flink-streaming-java_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721) ~[flink-runtime_2.11-1.11.1.jar:1.11.1]
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546) ~[flink-runtime_2.11-1.11.1.jar:1.11.1]
	at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_252]

<dependency>
    <groupId>org.apache.flink</groupId>
    <artifactId>flink-connector-gcp-pubsub_${scala.binary.version}</artifactId>
    <version>1.11.1</version>
</dependency>

<dependency>
   <groupId>org.apache.flink</groupId>
    <artifactId>flink-connector-kinesis_${scala.binary.version}</artifactId>
    <version>1.11.1</version>
</dependency>

Cause
This is caused by a Guava dependency conflict:

• Kinesis Consumer > 18.0
• GCP PubSub > 26.0-android

NettyChannelBuilder fails to initialise due to missing method in guava:

• com.google.common.base.Preconditions.checkArgument(ZLjava/lang/String;CLjava/lang/Object;)V

Possible Fixes

• Align Guava versions
• Shade Guava in either connector