Memcache Common phenomenon (i) Avalanche phenomenon

memcache Common phenomenon (i) Avalanche phenomenon explanation: memcached avalanche phenomenon is because the cache server problems caused the database pressure increase, resulting in the database can not run properly. 1, many large corporate web sites may have a number of cache servers, so if there is a problem, resulting in a lower hit rate of the query. or the cache is invalidated, and the time period of failure is exactly when the site traffic is large, the request database will reach a peak, which is the cause of the avalanche. 2, the solution: 1, as far as possible when the amount of access to the cache failure or update the cache.