Example on using aiomcache for a cluster about aiomcache HOT 4 OPEN

@duxing I was looking at the source code, as I'm still wondering if I should use aiomcache, emcache or pymemcache (probably will end up with emcache as pymemcache provides most features, but emcache is async, and aiomcache doesn't appear to have cluster support). I don't see any hashing code. I doubt this library provides clustering support at the time of writing this.

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@takeda I did the same assessment and I prefer the features and performance of aiomcache more than other options. I briefly went through the source code and didn't see the client-side of hashing code and I haven't continued to figure out the set up for a multi-node cluster. Not having that support would be a deal breaker for production adoption and I really wish it can be supported

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But, if anyone wants to work on it, we can certainly accept new PRs.

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The hash computation can be expensive, especially with large number of nodes, because (as I understand from looking at emcache code) the hashing is done for every node, and then node with highest score is picked up. That could be the reason why it is slower.

I do like aiomcache interface, get, and multi_get feels clearer than get and get_multi.

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