问题
In the Active MQ Admin console of what is the difference between "Number Of Pending Messages" and "Messages Enqueued"? When a Message is placed on to the queue, should both these values should match?
回答1:
pending messages = number of messages CURRENTLY waiting for delivery in the destination (the current size of the queue)
enqueued messages = number of messages that where enqueued in the destination since the last statistic reset. This number can only rise.
dequeued messages = messages delivered from the destination to consumers. this number can be higher that the number of enqueued messages if a message was delivered to multiple consumers (topics).
来源：https://stackoverflow.com/questions/7786086/difference-between-pending-messages-and-enqueue-counter-in-active-mq