title: Couchbase error: rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting onNext value
body: <p>I have a <code>Spring-boot</code> app that saves data to a <code>Couchbase</code> server.</p>
  
  <p>I like to save about 500k Students using this code:</p>
  
  <pre><code>for (String student: students) {
    ...
    bucket.upsert(JsonDocument.create(&lt;unique key here&gt;, TTL, JsonObject.fromJson(studentAsJson)));                
  }
  </code></pre>
  
  <p>This works fine for small amount of Students (up to 100K +-).</p>
  
  <p>But whenever app reaches roughly the 110K-140K Student, I get this error:</p>
  
  <pre><code>2018-12-23 16:20:57.804 ERROR 17468 --- [nio-8989-exec-6] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is com.couchbase.client.java.error.TemporaryFailureException] with root cause
  
  rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting onNext value: com.couchbase.client.core.message.kv.UpsertResponse.class
  at rx.exceptions.OnErrorThrowable.addValueAsLastCause(OnErrorThrowable.java:118) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:73) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.observers.Subscribers$5.onNext(Subscribers.java:235) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onNext(OnSubscribeDoOnEach.java:101) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.internal.producers.SingleProducer.request(SingleProducer.java:65) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.internal.producers.ProducerArbiter.setProducer(ProducerArbiter.java:126) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.internal.operators.OnSubscribeTimeoutTimedWithFallback$TimeoutMainSubscriber.setProducer(OnSubscribeTimeoutTimedWithFallback.java:155) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.Subscriber.setProducer(Subscriber.java:205) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.Subscriber.setProducer(Subscriber.java:205) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.Subscriber.setProducer(Subscriber.java:205) ~[rxjava-1.3.8.jar:1.3.8]
  at rx.subjects.AsyncSubject.onCompleted(AsyncSubject.java:103) ~[rxjava-1.3.8.jar:1.3.8]
  at com.couchbase.client.core.endpoint.AbstractGenericHandler.completeResponse(AbstractGenericHandler.java:508) ~[core-io-1.7.1.jar:na]
  at com.couchbase.client.core.endpoint.AbstractGenericHandler.access$000(AbstractGenericHandler.java:86) ~[core-io-1.7.1.jar:na]
  at com.couchbase.client.core.endpoint.AbstractGenericHandler$1.call(AbstractGenericHandler.java:526) ~[core-io-1.7.1.jar:na]
  at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55) ~[rxjava-1.3.8.jar:1.3.8]
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_161]
  at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_161]
  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) ~[na:1.8.0_161]
  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) ~[na:1.8.0_161]
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_161]
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[na:1.8.0_161]
  at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]
  </code></pre>
  
  <p>My <code>Couchbase</code> is running in <code>Docker</code> on the localhost and I wonder if this is some real problem or just limitation due to docker &amp; localhost.</p>