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bwasti

Consistency in a memcache seems like a very difficult problem. I imagine the approaches to achieve this are similar to the approaches to achieve cache consistency we saw earlier in the course. However, with many large scale sites (Facebook has been mentioned), eventual consistency seems to satisfy a large number of requirements.

paraU

True. What makes the consistency here really difficult is that communication now depends on slow and unreliable network rather than the fast and reliable inter-connect. Besides, synching time is extremely difficult in this distributed working environment.