nodes of every shard changes every epoch ? The datas are splitted in each shard ? If yes shard communicate with other shard to ask for certain data when they need them ? How some nodes know some account balance if they are not part of that shard ?
You have read the docs? https://docs.multiversx.com/technology/adaptive-state-sharding/ And the validators docs, will address you questions https://docs.multiversx.com/validators/overview/
I just read it, I have just a question: when there is a reorganization of the shards every node reorganized have to download all the database of that new shard ?
only the data of the last 3 epochs (days)
What if they need older data ?
There are full achieve nodes which have the entire chain s data and observers which keep for 60 epochs that can be called.
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