Hi Tim: Maybe my description make some confusion. I say no other processes means there is only the broker running on the server. I describe my situation more clearly: 1. I start a broker on a server. 2. I start several producers and consumers on other servers, and publish, consume one queue on the broker. 3. When the queue has many messages unconsumed(for the consumer can't keep up with publisher), I see a consumer which has the same clientId with the broker. For example, by default, when start a broker, we can get it's id from the web or from the console. The id is formated like this, hostname-xxxxx-milliseconds at start- x:x. The client I saw has the same string "hostname-xxxxx-milliseconds at start-", and different "x:x". 4. When the number of uncosumed message in queue decreased, the consumer stopped. I know that starting a consumer or producer without setting clientid will formate it's clientId like i mentioned before. But in my situation, the consumer's clientId has same milliseconds string with broker. This milliseconds indicate the time when the broker start up. So, I guess these consumer are started by the broker itself. But I don't know what trigger this and where the messages consumed by it will write to.
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