On Tue, Jul 9, 2013 at 5:22 PM, Ben Niven-Jenkins <[email protected]>wrote:
> > [BN] Even if a single server is calculating both the network & cost maps > then you are likely to have multiple servers for resiliency or due to > demand load and might put them behind a load balancer. Because the network > map and cost map are retrieved via separate requests you cannot guarantee > both requests hit the same backend server (e.g. Because a server may fail > or be removed from the load balancer pool) so you need to be able to > deterministically generate vtags across different servers even for your use > case I think. > > Agree that different requests can hit different servers, and I interpret "deterministically" as the following: two network maps have the same vtag => they are the same map Note that the preceding condition allows some usage of random variables; for example, in the case of only a master who computes the vtag, and the other load balancers are just data/storage servers, then the master can use random variables, or nonce... Of course, the preceding is internal implementation. We just need to specify the semantics, as the preceding "deterministically" mean. Agree? Richard >
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