Ask HN: Petabyte Dictionary Lookup

2 pointsflerovium3y ago2 comments

What is the cheapest and most efficient way to make a map from keys to values at very large scale, perhaps several petabytes?

When you query, the results are allowed to be a little stale.

It should be available to several boxes on a datacenter. Services that provide this are acceptable.

2 comments

2 comments · 2 top-level

nikonyrh3y ago

Well the theory tells us that lookups are O(1) anyway, so the implementation doesn't matter ;)

Will the dataset change over time, or is it immutable? I have some thoughts on this, but I have no idea how it would scale to terabyte-scale and even further.

icsa3y ago

Extendible hashing or Minimal perfect hashing

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