我有一个数据流管道，其中使用pubsub消息，对其进行处理，然后发布到pubsub。
每当我进行过多的计算（即增加每条消息的处理量）时，都会收到异常。 ： java.util.concurrent.ExecutionException：org.apache.beam.vendor.grpc.v1p13p1.io.grpc.StatusRuntimeException：CANCELLED：在收到一半关闭前取消
什么原因导致此错误？我该如何避免呢？ 完整的堆栈跟踪：
org.apache.beam.vendor.grpc.v1p13p1.io.grpc.StatusRuntimeException: CANCELLED: call already cancelled
org.apache.beam.vendor.grpc.v1p13p1.io.grpc.Status.asRuntimeException(Status.java:517)
org.apache.beam.vendor.grpc.v1p13p1.io.grpc.stub.ServerCalls$ServerCallStreamObserverImpl.onNext(ServerCalls.java:335)
org.apache.beam.sdk.fn.stream.DirectStreamObserver.onNext(DirectStreamObserver.java:98)
org.apache.beam.sdk.fn.stream.SynchronizedStreamObserver.onNext(SynchronizedStreamObserver.java:46)
org.apache.beam.runners.fnexecution.control.FnApiControlClient.handle(FnApiControlClient.java:84)
org.apache.beam.runners.dataflow.worker.fn.control.RegisterAndProcessBundleOperation.start(RegisterAndProcessBundleOperation.java:254)
org.apache.beam.runners.dataflow.worker.util.common.worker.MapTaskExecutor.execute(MapTaskExecutor.java:77)
org.apache.beam.runners.dataflow.worker.fn.control.BeamFnMapTaskExecutor.execute(BeamFnMapTaskExecutor.java:125)
org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.process(StreamingDataflowWorker.java:1283)
org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.access$1000(StreamingDataflowWorker.java:147)
org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker$6.run(StreamingDataflowWorker.java:1020)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)