Can the estimated time of access times for distributed keyvalue stores be below 1ms?

Asked Mar 21 '14 at 14:53

Active Mar 21 '14 at 14:53

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I'm digging through various Redis/Ceph/Elliptics benchmark to determine, whenever its theoretically possible to reach (very optimistic) request completion time below milliseconds in a non-SSD non-million worth-of-SAS-disks environment.

It is known that for localhost installations, random read performance for Elliptics large dataset is around 3.5ms/item, and almost same time is officially given for Redis.

(Note: network latency is ignored for this question).

Is there a known K-V store with higher confirmed performance?

asked Mar 21 '14 at 14:53

kagali-san

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Disks only spin so fast. There's a certain minimum latency associated with having to get the data. – David Schwartz Mar 21 '14 at 18:34
@DavidSchwartz but there is RAM.. – kagali-san Mar 22 '14 at 08:56
If 100% of your data fits in RAM, then fine. But any time a request needs data not in RAM, you have that disk latency. No matter what the software does, you have that inherent limit. – David Schwartz Mar 22 '14 at 20:12

Can the estimated time of access times for distributed keyvalue stores be below 1ms?

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