-
Notifications
You must be signed in to change notification settings - Fork 684
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
slot-based-collator: Collation & block-builder communication #3966
Labels
T0-node
This PR/Issue is related to the topic “node”.
Comments
Both things you are mentioning here sound like things that should be done naturally in the block builder task.
The block builder needs to check any way what is the latest candidate to build upon on. If the parachain build too many blocks ahead, it can not continue building. This is basically the "signal" that we didn't submit collations or similar. |
github-merge-queue bot
pushed a commit
that referenced
this issue
Jul 5, 2024
Part of #3168 On top of #3568 ### Changes Overview - Introduces a new collator variant in `cumulus/client/consensus/aura/src/collators/slot_based/mod.rs` - Two tasks are part of that module, one for block building and one for collation building and submission. - Introduces a new variant of `cumulus-test-runtime` which has 2s slot duration, used for zombienet testing - Zombienet tests for the new collator **Note:** This collator is considered experimental and should only be used for testing and exploration for now. ### Comparison with `lookahead` collator - The new variant is slot based, meaning it waits for the next slot of the parachain, then starts authoring - The search for potential parents remains mostly unchanged from lookahead - As anchor, we use the current best relay parent - In general, the new collator tends to be anchored to one relay parent earlier. `lookahead` generally waits for a new relay block to arrive before it attempts to build a block. This means the actual timing of parachain blocks depends on when the relay block has been authored and imported. With the slot-triggered approach we are authoring directly on the slot boundary, were a new relay chain block has probably not yet arrived. ### Limitations - Overall, the current implementation focuses on the "happy path" - We assume that we want to collate close to the tip of the relay chain. It would be useful however to have some kind of configurable drift, so that we could lag behind a bit. #3965 - The collation task is pretty dumb currently. It checks if we have cores scheduled and if yes, submits all the messages we have received from the block builder until we have something submitted for every core. Ideally we should do some extra checks, i.e. we do not need to submit if the built block is already too old (build on a out of range relay parent) or was authored with a relay parent that is not an ancestor of the relay block we are submitting at. #3966 - There is no throttling, we assume that we can submit _velocity_ blocks every relay chain block. There should be communication between the collator task and block-builder task. - The parent search and ConsensusHook are not yet properly adjusted. The parent search makes assumptions about the pending candidate which no longer hold. #3967 - Custom triggers for block building not implemented. --------- Co-authored-by: Davide Galassi <davxy@datawok.net> Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com> Co-authored-by: Bastian Köcher <git@kchr.de> Co-authored-by: Javier Viola <363911+pepoviola@users.noreply.github.com> Co-authored-by: command-bot <>
TomaszWaszczyk
pushed a commit
to TomaszWaszczyk/polkadot-sdk
that referenced
this issue
Jul 7, 2024
Part of paritytech#3168 On top of paritytech#3568 ### Changes Overview - Introduces a new collator variant in `cumulus/client/consensus/aura/src/collators/slot_based/mod.rs` - Two tasks are part of that module, one for block building and one for collation building and submission. - Introduces a new variant of `cumulus-test-runtime` which has 2s slot duration, used for zombienet testing - Zombienet tests for the new collator **Note:** This collator is considered experimental and should only be used for testing and exploration for now. ### Comparison with `lookahead` collator - The new variant is slot based, meaning it waits for the next slot of the parachain, then starts authoring - The search for potential parents remains mostly unchanged from lookahead - As anchor, we use the current best relay parent - In general, the new collator tends to be anchored to one relay parent earlier. `lookahead` generally waits for a new relay block to arrive before it attempts to build a block. This means the actual timing of parachain blocks depends on when the relay block has been authored and imported. With the slot-triggered approach we are authoring directly on the slot boundary, were a new relay chain block has probably not yet arrived. ### Limitations - Overall, the current implementation focuses on the "happy path" - We assume that we want to collate close to the tip of the relay chain. It would be useful however to have some kind of configurable drift, so that we could lag behind a bit. paritytech#3965 - The collation task is pretty dumb currently. It checks if we have cores scheduled and if yes, submits all the messages we have received from the block builder until we have something submitted for every core. Ideally we should do some extra checks, i.e. we do not need to submit if the built block is already too old (build on a out of range relay parent) or was authored with a relay parent that is not an ancestor of the relay block we are submitting at. paritytech#3966 - There is no throttling, we assume that we can submit _velocity_ blocks every relay chain block. There should be communication between the collator task and block-builder task. - The parent search and ConsensusHook are not yet properly adjusted. The parent search makes assumptions about the pending candidate which no longer hold. paritytech#3967 - Custom triggers for block building not implemented. --------- Co-authored-by: Davide Galassi <davxy@datawok.net> Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com> Co-authored-by: Bastian Köcher <git@kchr.de> Co-authored-by: Javier Viola <363911+pepoviola@users.noreply.github.com> Co-authored-by: command-bot <>
TarekkMA
pushed a commit
to moonbeam-foundation/polkadot-sdk
that referenced
this issue
Aug 2, 2024
Part of paritytech#3168 On top of paritytech#3568 ### Changes Overview - Introduces a new collator variant in `cumulus/client/consensus/aura/src/collators/slot_based/mod.rs` - Two tasks are part of that module, one for block building and one for collation building and submission. - Introduces a new variant of `cumulus-test-runtime` which has 2s slot duration, used for zombienet testing - Zombienet tests for the new collator **Note:** This collator is considered experimental and should only be used for testing and exploration for now. ### Comparison with `lookahead` collator - The new variant is slot based, meaning it waits for the next slot of the parachain, then starts authoring - The search for potential parents remains mostly unchanged from lookahead - As anchor, we use the current best relay parent - In general, the new collator tends to be anchored to one relay parent earlier. `lookahead` generally waits for a new relay block to arrive before it attempts to build a block. This means the actual timing of parachain blocks depends on when the relay block has been authored and imported. With the slot-triggered approach we are authoring directly on the slot boundary, were a new relay chain block has probably not yet arrived. ### Limitations - Overall, the current implementation focuses on the "happy path" - We assume that we want to collate close to the tip of the relay chain. It would be useful however to have some kind of configurable drift, so that we could lag behind a bit. paritytech#3965 - The collation task is pretty dumb currently. It checks if we have cores scheduled and if yes, submits all the messages we have received from the block builder until we have something submitted for every core. Ideally we should do some extra checks, i.e. we do not need to submit if the built block is already too old (build on a out of range relay parent) or was authored with a relay parent that is not an ancestor of the relay block we are submitting at. paritytech#3966 - There is no throttling, we assume that we can submit _velocity_ blocks every relay chain block. There should be communication between the collator task and block-builder task. - The parent search and ConsensusHook are not yet properly adjusted. The parent search makes assumptions about the pending candidate which no longer hold. paritytech#3967 - Custom triggers for block building not implemented. --------- Co-authored-by: Davide Galassi <davxy@datawok.net> Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com> Co-authored-by: Bastian Köcher <git@kchr.de> Co-authored-by: Javier Viola <363911+pepoviola@users.noreply.github.com> Co-authored-by: command-bot <>
Not needed anymore, similar ideas in #6066 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Collation and block-builder task in the parachain node should be able to communicate with each other:
The text was updated successfully, but these errors were encountered: