The design of content distribution network with object storage 

The primary question we answer in this article is why objects don’t have multiple addresses for access from geographically closer regions. We know that there is more than one copy of objects and they are geographically replicated. Content distribution network also intends to do something very similar. They have content designated to proxy servers and the purpose of these servers is to make content available at the nearest location. These mirrored contents enable faster access over network simply by reducing the round-trip time. That is how content distribution network positions itself.   

Object storage also has geo-redundant replication and there are secondary addresses for read access to these replicated data. This means data becomes available even during a failover. The question is clearer when we refer to geographically close primary addresses that are served from the same object storage. As long as the user does not have to switch to a secondary address and the primary address is already equivalent to that from a distribution network in terms of performance, the user has no justification to use a content distribution network.  

With this context, let us delve into the considerations for enabling such an address for an object exposed over the object storage. We know gateways perform the equivalent of routing to designated servers and that the address merely needs to have a virtual address which is an address for the object that does not change in appearance to the user. Internally the address may be interpreted and routed to designated servers based on routing rules, availability and load. Therefore, the address may work well in terms of being a primary address for the object.  A gateway like functionality is already something that works for web server so its design is established and well-known. The availability of the object storage as the unified storage for content regardless of copies or versions is also well-established and known. The purpose for the copies of the objects may merely be for redundancy but there is no restriction for keeping copies of the same object for geographical purposes. This means we can have adequate number of objects for as many geography-based accesses as needed. We have now resolved the availability of objects and their access using a primary distribution network like address. 

boolean isDivisibleBy221(uint n)
{
return isDivisibleBy13(n) && isDivisibleBy17(n);
}