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Update high-level-overview.md (#1093)

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Update outdated GRANDPA pallet docs.
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Tomasz Drwięga
2021-08-27 05:31:56 +02:00
committed by Bastian Köcher
parent 68eaee1bd4
commit 1527f515de
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@@ -48,27 +48,15 @@ High level sequence charts of the process can be found in [a separate document](
### Substrate (GRANDPA) Header Sync
The header sync pallet (`pallet-substrate-bridge`) is an on-chain light client for chains which use
GRANDPA finality. It is part of the target chain's runtime, and accepts headers from the source
chain. Its main goals are to accept valid headers, track GRANDPA finality set changes, and verify
GRANDPA finality proofs (a.k.a justifications).
The header sync pallet (`pallet-bridge-grandpa`) is an on-chain light client for chains which use
GRANDPA finality. It is part of the target chain's runtime, and accepts finality proofs from the source
chain. Verify GRANDPA finality proofs (a.k.a justifications) and track GRANDPA finality set changes.
The pallet does not care about what block production mechanism is used for the source chain
(e.g Aura or BABE) as long as it uses the GRANDPA finality gadget. Due to this it is possible for
the pallet to import (but not necessarily finalize) headers which are _not_ valid according to the
source chain's block production mechanism.
(e.g Aura or BABE) as long as it uses the GRANDPA finality gadget. In fact the pallet does not
necessarily store all produced headers, we only import headers with valid GRANDPA justifications.
The pallet has support for tracking forks and uses the longest chain rule to determine what the
canonical chain is. The pallet allows headers to be imported on a different fork from the canonical
one as long as the headers being imported don't conflict with already finalized headers (for
example, it will not allow importing a header at a lower height than the best finalized header).
When tracking authority set changes, the pallet - unlike the full GRANDPA protocol - does not
support tracking multiple authority set changes across forks. Each fork can have at most one pending
authority set change. This is done to prevent DoS attacks if GRANDPA on the source chain were to
stall for a long time (the pallet would have to do a lot of expensive ancestry checks to catch up).
Referer to the [pallet documentation](../modules/substrate/src/lib.rs) for more details.
Referer to the [pallet documentation](../modules/grandpa/src/lib.rs) for more details.
#### Header Relayer strategy