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Queue

If a particular pool limit has been reached and the message at hand cannot be served immediately, it is placed in the queue. The queue is a priority-based collection. Higher-priority messages are placed before the lower ones. So, a queue overflow may lead to dropping some of the already queued messages that have a lower priority than those coming now. With the corresponding operators becoming available, the messages are unqueued and sent for processing.

The queue has the same principles not only for on-demand operators with their pools, but everywhere else (even for internal VZAgent messages).

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