for example, iphone rewards are given if the judgment key does not exist, and the key is set immediately after the code is entered, so that multiple users will not all get the prize. I wonder whether the concurrency is high enough or there is a probability that multiple user judgment keys do not exist at the same time, so that a lot of prizes will be issued.
No, redis is single-threaded. The operations of multithreaded programs do not exist concurrency in redis . Once you have the winning key, other threads will access it again.
depends on what command you use, you will definitely use get, and you will not use the setnx command
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after you have climbed with scrapy-redis spiders, you will not be able to climb again. If you change the name of the spider, you can crawl again, and if you change back to the original name, you will start the deduplication mechanism again. Although you...
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Baidu found this way of thinking: needs a queue, a queue of panic buying results and a queue of inventory. In the case of high concurrency, first put the user into the queue, use a thread loop to remove a user from the queue, and judge whether the user...
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