kennknowles commented on a change in pull request #14833:
URL: https://github.com/apache/beam/pull/14833#discussion_r635504461



##########
File path: 
runners/google-cloud-dataflow-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/fn/logging/BeamFnLoggingServiceTest.java
##########
@@ -141,13 +144,16 @@ public void 
testMultipleClientsFailingIsHandledGracefullyByServer() throws Excep
                               .withOnError(waitForTermination::countDown)
                               .build());
               outboundObserver.onNext(createLogsWithIds(instructionId, 
-instructionId));
-              outboundObserver.onError(new RuntimeException("Client " + 
instructionId));
-              waitForTermination.await();
+              outboundObservers.add(outboundObserver);
               return null;
             });
       }
       ExecutorService executorService = Executors.newCachedThreadPool();
       executorService.invokeAll(tasks);
+      for (int i = 1; i <= 3; ++i) {
+        outboundObservers.take().onError(new RuntimeException("Client " + i));

Review comment:
       AFAICT this way of writing the test more clearly reads what it is 
supposed to do anyhow. This change LGTM.




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