Scaling up: the dispatcher thread.
向上扩展：调度程序线程。
It will be useful to recognize when we have reached the limit of the dispatcher thread.
知道何时达到调度程序线程的限制非常有用。
Each application server would then perform its own dispatching within itself, using its own dispatcher thread.
然后，每个应用程序服务器都将使用自己的调度程序线程在其内执行自己的分派。
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