StackOverflow2013

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4941682
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2011-02-09T05:35:30.383
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The two most common ways of handling this are to turn away requests when the server is too busy, or handle each request slower. Turning away requests is easy; just run a fixed number of instances. The OS may or may not queue up a few connection requests, but in general the users will simply fail to connect. A more graceful way of doing it is to have the service return an error code indicating the client should try again later. Handling requests slower is a bit more work, because it requires separating the servlet handling the requests from the class doing the work in a different thread. You can have a larger number of servlets than worker bees. When a request comes in it accepts it, waits for a worker bee, grabs it and uses it, frees it, then returns the results. The two can communicate through one of the classes in <a href="http://java.sun.com/developer/technicalArticles/J2SE/concurrency/" rel="nofollow">java.util.concurrent</a>, like <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/LinkedBlockingQueue.html" rel="nofollow">LinkedBlockingQueue</a> or <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/ThreadPoolExecutor.html" rel="nofollow">ThreadPoolExecutor</a>. If you want to get really fancy, you can use something like a <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/PriorityBlockingQueue.html" rel="nofollow">PriorityBlockingQueue</a> to serve some customers before others. Me, I would throw more hardware at it like Anon said ;)
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1. POPrevent client from overloading server?
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1. USdj_segfault
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