If this queue is full, the application is not allowed to send any more data until the backlog is cleaned up.
如果这个队列满了，就不允许应用程序发送更多数据，直到清理完积压的队列为止。
Backlog is the queue limit for the number of connections on a socket.
backlog是套接字上的连接数的队列限制。
Browsing to /queue/length gives you the current queue backlog.
浏览 /queue/length，您就可以知道当前的队列等待情况。
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