Details
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Improvement
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Status: Resolved
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Major
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Resolution: Fixed
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3.11.3
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None
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Unknown
Description
Using Camel 3.11.3 we experience intermittent disconnections when configuring a Google PubSub endpoint in synchronous pull mode.
The application logs a warning message and then stops pulling new messages.
com.google.api.gax.rpc.DeadlineExceededException: io.grpc.StatusRuntimeException: DEADLINE_EXCEEDED: deadline exceeded after 59.985104781s. [buffered_nanos=7626625, remote_addr=pubsub.googleapis.com/74.125.140.95:443] at com.google.api.gax.rpc.ApiExceptionFactory.createException(ApiExceptionFactory.java:51) at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:72) at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:60) at com.google.api.gax.grpc.GrpcExceptionCallable$ExceptionTransformingFuture.onFailure(GrpcExceptionCallable.java:97) at com.google.api.core.ApiFutures$1.onFailure(ApiFutures.java:68) at com.google.common.util.concurrent.Futures$CallbackListener.run(Futures.java:1074) at com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:30) at com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:1213) at com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:983) at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:771) at io.grpc.stub.ClientCalls$GrpcFuture.setException(ClientCalls.java:563) at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:533) at io.grpc.internal.DelayedClientCall$DelayedListener$3.run(DelayedClientCall.java:463) at io.grpc.internal.DelayedClientCall$DelayedListener.delayOrExecute(DelayedClientCall.java:427) at io.grpc.internal.DelayedClientCall$DelayedListener.onClose(DelayedClientCall.java:460) at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:553) at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:68) at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:739) at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:718) at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37) at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.base/java.util.concurrent.FutureTask.run(Unknown Source) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.base/java.lang.Thread.run(Unknown Source) Suppressed: com.google.api.gax.rpc.AsyncTaskException: Asynchronous task failed at com.google.api.gax.rpc.ApiExceptions.callAndTranslateApiException(ApiExceptions.java:57) at com.google.api.gax.rpc.UnaryCallable.call(UnaryCallable.java:112) at org.apache.camel.component.google.pubsub.GooglePubsubConsumer$SubscriberWrapper.synchronousPull(GooglePubsubConsumer.java:185)
The fix applied in CAMEL-16263 allows the SubscriberWrapper thread to recover from a retryable PubSub server error.
However the PubSub client library retries only ABORTED, UNAVAILABLE, UNKNOWN errors by default.
Proposed fix: add a component option to specify additional retryable error codes in synchronous pull mode.
It is possible to configure custom retryable codes by using the method builder.pullSettings().setRetryableCodes() in SubscriberStubSettings.Builder
Note: The default builder SubscriberStubSettings.Builder configures retries with exponential backoff (current default settings: retrying during 1 minute).
In addition the loop in org.apache.camel.component.google.pubsub.GooglePubsubConsumer.SubscriberWrapper#synchronousPull ensures that the consumer will trigger a new request when the retries end, effectively retrying forever.
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