Lessons Learned: Sharding for startups
Startup Lessons Learned
JANUARY 4, 2009
More common is to use a one-way hashing algorithm to map the data to be accessed to one of the shards that store it. Using memcacheds multiget, which allows the fetching of many keys in parallel, I have written code to aggregate all the shard lookups for a given page and prefetch them, reducing the overhead even further.
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