Scala Spark Uncaught Document在访问Couchbase时不会出现异常

我正在用scala编写一个spark进程，并试图从mapPartitions函数中从couchbase获取一个子文档

将spark 2.1.0和spark连接器用于couchbase：

<dependency>
    <groupId>com.couchbase.client</groupId>
    <artifactId>spark-connector_2.11</artifactId>
    <version>2.1.0</version>
</dependency>

运行.compute（）时，如果文档在CB中不存在，则会抛出DocumentDoesNotExistException

当然，这是可以的，但我想抓住这个例外

我已经尝试在catch部分添加了所有可能的一般情况，但是在运行失败时没有捕获异常

这就是错误：

com.couchbase.client.java.error.DocumentDoesNotExistException: Document not found for subdoc API: pr_OcgltxCHeI0=
    at com.couchbase.client.java.subdoc.SubdocHelper.commonSubdocErrors(SubdocHelper.java:64)
    at com.couchbase.client.java.subdoc.AsyncLookupInBuilder$5.call(AsyncLookupInBuilder.java:430)
    at com.couchbase.client.java.subdoc.AsyncLookupInBuilder$5.call(AsyncLookupInBuilder.java:399)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:69)
    at rx.observers.Subscribers$5.onNext(Subscribers.java:235)
    at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onNext(OnSubscribeDoOnEach.java:101)
    at rx.internal.producers.SingleProducer.request(SingleProducer.java:65)
    at rx.internal.producers.ProducerArbiter.setProducer(ProducerArbiter.java:126)
    at rx.internal.operators.OnSubscribeRedo$2$1.setProducer(OnSubscribeRedo.java:267)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102)
    at rx.Subscriber.setProducer(Subscriber.java:205)
    at rx.Subscriber.setProducer(Subscriber.java:205)
    at rx.subjects.AsyncSubject.onCompleted(AsyncSubject.java:103)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.completeResponse(AbstractGenericHandler.java:376)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.access$000(AbstractGenericHandler.java:69)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler$1.call(AbstractGenericHandler.java:394)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting onNext value: com.couchbase.client.core.message.kv.subdoc.simple.SimpleSubdocResponse.class
    at rx.exceptions.OnErrorThrowable.addValueAsLastCause(OnErrorThrowable.java:109)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:73)
    ... 21 more

---

我做错了什么？为什么我不能捕捉到这个异常？

你能在spark之外以这种方式捕捉异常吗？你说的“spark之外”是什么意思？

com.couchbase.client.java.error.DocumentDoesNotExistException: Document not found for subdoc API: pr_OcgltxCHeI0=
    at com.couchbase.client.java.subdoc.SubdocHelper.commonSubdocErrors(SubdocHelper.java:64)
    at com.couchbase.client.java.subdoc.AsyncLookupInBuilder$5.call(AsyncLookupInBuilder.java:430)
    at com.couchbase.client.java.subdoc.AsyncLookupInBuilder$5.call(AsyncLookupInBuilder.java:399)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:69)
    at rx.observers.Subscribers$5.onNext(Subscribers.java:235)
    at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onNext(OnSubscribeDoOnEach.java:101)
    at rx.internal.producers.SingleProducer.request(SingleProducer.java:65)
    at rx.internal.producers.ProducerArbiter.setProducer(ProducerArbiter.java:126)
    at rx.internal.operators.OnSubscribeRedo$2$1.setProducer(OnSubscribeRedo.java:267)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102)
    at rx.Subscriber.setProducer(Subscriber.java:205)
    at rx.Subscriber.setProducer(Subscriber.java:205)
    at rx.subjects.AsyncSubject.onCompleted(AsyncSubject.java:103)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.completeResponse(AbstractGenericHandler.java:376)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.access$000(AbstractGenericHandler.java:69)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler$1.call(AbstractGenericHandler.java:394)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting onNext value: com.couchbase.client.core.message.kv.subdoc.simple.SimpleSubdocResponse.class
    at rx.exceptions.OnErrorThrowable.addValueAsLastCause(OnErrorThrowable.java:109)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:73)
    ... 21 more