haf commented on issue #6594: [FLINK-9311] [pubsub] Added PubSub source connector with support for checkpointing (ATLEAST_ONCE) URL: https://github.com/apache/flink/pull/6594#issuecomment-481330654 When I run this code with Flink 1.7, I get this critical error when things crash: ``` Apr 09, 2019 6:44:17 PM io.grpc.internal.ManagedChannelOrphanWrapper$ManagedChannelReference cleanQueue SEVERE: *~*~*~ Channel ManagedChannelImpl{logId=5, target=pubsub.googleapis.com:443} was not shutdown properly!!! ~*~*~* Make sure to call shutdown()/shutdownNow() and wait until awaitTermination() returns true. java.lang.RuntimeException: ManagedChannel allocation site at io.grpc.internal.ManagedChannelOrphanWrapper$ManagedChannelReference.<init>(ManagedChannelOrphanWrapper.java:103) at io.grpc.internal.ManagedChannelOrphanWrapper.<init>(ManagedChannelOrphanWrapper.java:53) at io.grpc.internal.ManagedChannelOrphanWrapper.<init>(ManagedChannelOrphanWrapper.java:44) at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:419) at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createSingleChannel(InstantiatingGrpcChannelProvider.java:222) at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createChannel(InstantiatingGrpcChannelProvider.java:164) at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.getTransportChannel(InstantiatingGrpcChannelProvider.java:156) at com.google.api.gax.rpc.ClientContext.create(ClientContext.java:157) at com.google.cloud.pubsub.v1.stub.GrpcSubscriberStub.create(GrpcSubscriberStub.java:260) at okr.sources.DefaultPubSubSubscriberFactory.getSubscriber(DefaultPubSubSubscriberFactory.java:30) at okr.sources.PubSubSource.open(PubSubSource.java:96) at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36) at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102) at org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:424) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:290) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:704) at java.lang.Thread.run(Thread.java:748) ```
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