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# Blockchain Reactor
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The Blockchain Reactor's high level responsibility is to request blocks from peers or provide them
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with blocks, validate and persist the blocks to disk and play blocks to the ABCI app.
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The Blockchain Reactor's high level responsibility is to enable peers who are
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far behind the current state of the consensus to quickly catch up by downloading
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many blocks in parallel, verifying their commits, and executing them against the
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ABCI application.
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Tendermint full nodes run the Blockchain Reactor as a service to provide blocks
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to new nodes. New nodes run the Blockchain Reactor in "fast_sync" mode,
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where they actively make requests for more blocks until they sync up.
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Once caught up, they disable "fast_sync" mode, and turn on the Consensus Reactor.
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## Message Types
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}
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type bcBlockResponseMessage struct {
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Block *types.Block
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Block Block
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}
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type bcStatusRequestMessage struct {
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}
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```
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## Block Reactor
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## Blockchain Reactor
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* coordinates the pool for syncing
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* coordinates the store for persistence
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