Java API获取非compacted topic总消息数

/**
     * 获取某个topic的当前消息数
     * Java 8+ only
     *
     * @param topic
     * @param brokerList
     * @return
     */
    public static long totalMessageCount(String topic, String brokerList) {
        Properties props = new Properties();
        props.put("bootstrap.servers", brokerList);
        props.put("group.id", "test-group");
        props.put("enable.auto.commit", "false");
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

        try (KafkaConsumer consumer = new KafkaConsumer(props)) {
            List tps = Optional.ofNullable(consumer.partitionsFor(topic))
                    .orElse(Collections.emptyList())
                    .stream()
                    .map(info -> new TopicPartition(info.topic(), info.partition()))
                    .collect(Collectors.toList());
            Map beginOffsets = consumer.beginningOffsets(tps);
            Map endOffsets = consumer.endOffsets(tps);

            return tps.stream().mapToLong(tp -> endOffsets.get(tp) - beginOffsets.get(tp)).sum();
        }
    }