leoxchang opened a new issue #1862: The producer can not resend again when repsone code return "SYSTEM_BUSY" URL: https://github.com/apache/rocketmq/issues/1862 when the producer send message to broker,the response code return "SYSTEM_BUSY",the producer can not resend message again; this response code in DefaultMQProducerImpl.java may not be consider,why? this response code shoud try send again? 当生产者发送消息到broker，这个时候如果broker返回的response code为 2 即”SYSTEM_BUSY“时，这个时候生产者不会重新发送消息，这个Response code是否应该在”DefaultMQProducerImpl.java“中考虑重新发送，如果不考虑重新发送的话，为什么？
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