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First step in implementing #4386 (#4437)

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* First step in implementing https://github.com/paritytech/polkadot/issues/4386

This PR:

- Reduces MAX_UNSHARED_UPLOAD_TIME to 150ms
- Increases timeout on collation fetching to 1200ms
- Reduces limit on needed backing votes in the runtime

This PR does not yet reduce the number of needed backing votes on the
node as this can only be meaningfully enacted once the changed limit in
the runtime is live.

* Fix tests.

* Guide updates.

* Review remarks.

* Bump minimum required backing votes to 2 in runtime.

* Make sure node side code won't make runtime vomit.

* cargo +nightly fmt
This commit is contained in:
Robert Klotzner
2021-12-23 17:41:34 +01:00
committed by GitHub
parent 4689ccffce
commit 846828f61c
6 changed files with 44 additions and 19 deletions
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polkadot/roadmap/implementers-guide/src/node/backing/candidate-backing.md
+2 -2
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@@ -1,6 +1,6 @@
# Candidate Backing
The Candidate Backing subsystem ensures every parablock considered for relay block inclusion has been seconded by at least one validator, and approved by a quorum. Parablocks for which no validator will assert correctness are discarded. If the block later proves invalid, the initial backers are slashable; this gives polkadot a rational threat model during subsequent stages.
The Candidate Backing subsystem ensures every parablock considered for relay block inclusion has been seconded by at least one validator, and approved by a quorum. Parablocks for which not enough validators will assert correctness are discarded. If the block later proves invalid, the initial backers are slashable; this gives polkadot a rational threat model during subsequent stages.
Its role is to produce backable candidates for inclusion in new relay-chain blocks. It does so by issuing signed [`Statement`s][Statement] and tracking received statements signed by other validators. Once enough statements are received, they can be combined into backing for specific candidates.
@@ -91,7 +91,7 @@ match msg {
}
```
Add `Seconded` statements and `Valid` statements to a quorum. If quorum reaches validator-group majority, send a [`ProvisionerMessage`][PM]`::ProvisionableData(ProvisionableData::BackedCandidate(CandidateReceipt))` message.
Add `Seconded` statements and `Valid` statements to a quorum. If the quorum reaches a pre-defined threshold, send a [`ProvisionerMessage`][PM]`::ProvisionableData(ProvisionableData::BackedCandidate(CandidateReceipt))` message.
`Invalid` statements that conflict with already witnessed `Seconded` and `Valid` statements for the given candidate, statements that are double-votes, self-contradictions and so on, should result in issuing a [`ProvisionerMessage`][PM]`::MisbehaviorReport` message for each newly detected case of this kind.
On each incoming statement, [`DisputeCoordinatorMessage::ImportStatement`][DCM] should be issued.