我对Kafka很陌生。我正在创建两个主题和出版这两个主题从两个生产者。我有一个消费者，它使用来自这两个主题的消息。这是因为我想按优先级处理。
我从这两个主题都得到了一个流，但只要我开始迭代 ConsumerItreator 在任何一条小溪中，它都会阻塞那里。因为它是在文档中写的，所以它将被阻止，直到它收到新消息。
有没有人知道如何从一个Kafka消费者的两个主题和两条流中阅读？

Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
                topicCountMap.put(KafkaConstants.HIGH_TEST_TOPIC, new Integer(1));
                topicCountMap.put(KafkaConstants.LOW_TEST_TOPIC, new Integer(1));
                Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumerConnector.createMessageStreams(topicCountMap);
                KafkaStream<byte[], byte[]> highPriorityStream = consumerMap.get(KafkaConstants.HIGH_TEST_TOPIC).get(0);
                ConsumerIterator<byte[], byte[]> highPrioerityIterator = highPriorityStream.iterator();

                while (highPriorityStream.nonEmpty() && highPrioerityIterator.hasNext())
                {
                    byte[] bytes = highPrioerityIterator.next().message();
                    Object obj = null;
                    CLoudDataObject thunderDataObject = null;
                    try
                    {

                        obj = SerializationUtils.deserialize(bytes);
                        if (obj instanceof CLoudDataObject)
                        {
                            thunderDataObject = (CLoudDataObject) obj;
                            System.out.println(thunderDataObject);
                            // TODO Got the Thunder object here, now write code to send it to Thunder service.
                        }

                    }
                    catch (Exception e)
                    {
                    }
                }