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变量多次实例化Producer会出现 以下问题：
No topic route info in name server for the topic: TBW102
See http://rocketmq.apache.org/docs/faq/ for further details.
See http://rocketmq.apache.org/docs/faq/ for further details.
如果是仅实例一次 client 就不会出现这个问题
如果producer 多次实例化就就会出现
class MQProducerService extends Service { async send(topic, tags, payload, opts) { const logger = this.ctx.logger; const producer = new Producer(opts); let sendResult; try { const msg = new Message(topic, tags, JSON.stringify(payload)); sendResult = await producer.send(msg); } catch (err) { logger.error(err); } return sendResult; } }
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