Description
A negative cache is normally only desired if failure is very expensive and the error condition arises automatically without user's action. It creates a situation where the user is unable to isolate the cause of the failure: despite fixing everything he/she can think of, the program still refuses to work. When a failure is cached, the program should provide a clear indication of what must be done to clear the cache, in addition to a description of the cause of the error. In such conditions a negative cache is an example of a design anti-pattern.
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