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small fixes to adr, comments and cleanup

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Anca Zamfir
2019-05-08 22:23:23 -04:00
parent 299a7f3c0a
commit 714ac4fc46
4 changed files with 33 additions and 27 deletions
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docs/architecture/adr-042-blockchain-reactor-impl.md
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# ADR 041: Blockchain Reactor Design
# ADR 042: Blockchain Reactor Design
Author: @ancaz
@ -187,19 +187,19 @@ H: The FSM times out in `waitForPeer` state, moves to `finished` state where it
#### 2. Typical Fast Sync
S: A node fast syncs blocks from honest peers and eventually downloads and executes the penultimate block.
H: The FSM in `waitForBlock` state will receive the processedBlockEv from the reactor and detect that the termination height is achieved.
#### 3. Peer Fakes "Big" Height
#### 3. Peer Claims Big Height but no Blocks
S: In this scenario a faulty peer claims a big height (for which there are no blocks).
H: The requests for the non-existing block will timeout, the peer removed and the pool's maxPeerHeight updated. FSM checks if the termination height is achieved when peers are removed.
S': A variation of this scenario is a faulty peer that claims a big height and after receiving the Block request for an non-existing block sends an unsolicited Status response with a lower height.
H': FSM updates the peer height and check if the termination height is achieved.
H: The requests for the non-existing block will timeout, the peer removed and the pool's maxPeerHeight updated. FSM checks if the termination height is achieved when peers are removed.
#### 4. Highest Peer Removed or Updated to Short
S: The fast sync node is caught up with all peers except one tall peer. The tall peer is removed or it sends Status response with low height.
H: FSM checks termination condition on peer removal and updates.
#### 5. Block At Current Height Delayed