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- New peer joins the validator network and needs to get the whole blockchain.
- The peer lost several commit messages due to poor internet connection and needs to get the latest blocks.
- The peer was stopped and restarted after some time and needs to get the latest blocks.
- ...
Solution
Gossip
For peers to discover that they do not have latest blocks, peers send their latest block hashes to all other peers in the network every N seconds. If a peer discovers that it has a different latest block hash, it will request the missing blocks from other peers.
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With this design both the set of validating peers and their roles are known to the synchronizing peer for each new block.