This might be a silly newbie question, but why would one need to store the entire blockchain, apart from those hosting a big DApp like steemit that needs fast searches?
Can't there be some kind of work-sharing (with some redundancy of course), where you store a chunk of the chain in a deterministically computable way so that users know whom to ask for a specific information?
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Splitting blockchain (by block ranges) wouldn't have much much sense because it would be very hard to ask for useful information. However, we are moving towards fabrics and microservices.
Unless the client who asks for the data is aware of the distribution scheme.
Doesn't matter. If only blocks are distributed then it's really ineffective to grab such data as "who follows user x". Knowing who can give you block ranges is irrelevant info.
Reindexing whole blockchain with tags plugin turned on will get that information for fast access at the run time.
It's in network best interest to have seeders, not leechers.
True. A more clever breakup may be by transaction type.
Ultimately it would even make sense to store monetary transactions in the main chain, text data in one side chain and big data (such as videos) in another.
(I lack culture on this, this is pure speculation)
Having smaller dataset may help having specialized seeders, meaning more seeders. Think of a seeder/cache node specialized in content written in one language.