Questions tagged [cumulus]
Questions about the library used to convert a Substrate chain to a Polkadot Parachain.
45
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What is a concrete use case for cumulus's ability to return custom head data
This question is about cumulus PR https://github.com/paritytech/cumulus/pull/825. What is an example of when I would want to use custom head data.
The PR description itself says:
This can be for ...
- 1,115
3
votes
1
answer
44
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Node panics on restart after warp synced with both relay and parachain
We are observing the following panic for a parachain node that is warp synced fully on both sides when we try to restart the node:
Thread 'main' panicked at 'route from finalized to leaf should be ...
- 545
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1
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17
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How many collators are selected at a time or we can say same block height to authorise a parachain block?
"I'm trying to understand the mechanics of parachain block authorization in blockchain networks like Polkadot and similar multi-chain systems. Specifically, I'd like to know:
How many collators ...
- 442
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2
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Why Substrate, Cumulus and Polkadot repositories are going to be merged into a mono-repo?
It might not be the best place to ask this question, but I'm not sure there are other place, especially since others could be interested in the answer.
Why do the 3 repositories (Cumulus, Substrate ...
- 321
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When sending Transact XCM Instruction, how to specify the pallet which contains the extrinsic to execute on target parachain?
When sending Transact XCM Instruction from parachain A, how do I specify (or how does the xcm-executor know) the pallet / pallet id on the target Parachain B which contains the extrinsic to be ...
- 283
2
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1
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36
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Added ROC token on local Rococo account created using cumulus
I have Alice, bob and so on accounts created by cumulus itself. However, these account's have only 1 MUnit and I want to add more of them. I already tried !drip in faucet but that account is not added ...
- 41
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129
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How to make a parachain runtime upgrade
I´m trying to make a parachain runtime upgrade without a migration, as a way to understand the process before trying with a migration.
I´m using version 0.9.40 of polkadot for the relay chain and the ...
- 395
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82
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What prevents a replay attack in XCM?
I've been looking into Cumulus SDK's parachain and XCM handling functions in XcmpQueue to handle XCM protocol functions such as send_xcm(). It seems by default, messages are not signed when sent.
If ...
- 91
3
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1
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46
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What prevents a malicious user to spam large XCM messages?
I've been looking into Cumulus SDK's parachain and XCM handling functions in XcmpQueue to handle XCM protocol functions such as sending an XCM message with send_xcm(). I noticed that there's a message ...
- 91
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2
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153
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How does a parachain collator reliably know which parachain block (candidate recipt) got included on the relaychain to build the next block on?
I understand the entire path of a parachain block upto and including its candidateReciept being "included" on the relaychain, and its erasure coded PoVs being available with the relaychain ...
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58
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Is there any constrain forced on Parachains for block authoring logic?
I am reading Cumulus PDK and Parachain documentations, and looking forward to converting our project to a parachain and join the Polkadot ecosystem.
However, I am confused regarding the parachain ...
- 219
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84
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`MAXIMUM_BLOCK_WEIGHT` between solo chain and para chain
From Substrate:
https://github.dev/paritytech/substrate/blob/68d00e2d5132ef32e564e0320e89dfac57e1c46e/bin/node/runtime/src/lib.rs#L179
/// We allow for 2 seconds of compute with a 6 second average ...
- 663
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32
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Compiling cumulus v0.9.36 with --no-default-features
When attempting to compile cumulus on branch polkadot-v0.9.36 while disabling standard features, this error occurs:
nologik@nologik-laptop dkg-substrate % cargo check --workspace --no-default-features
...
- 141
2
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1
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28
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How to get the call `authorize_upgrade` from `cumulus_pallet_parachain_system` inside another pallet?
I would like to schedule the dispatch call authorize_upgrade inside a custom pallet. For this I need the call enum variant of the cumulus_pallet_parachain_system pallet. How can I get this? Via the ...
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27
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Build StorageProof for Benchmarks
Having some issues in fabricating a realistic StorageProof in substrate benchmarks. I can't use std and most examples are using std in tests via sp_state_machine.
Currently, I've hard coded the (root, ...
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error: could not compile `sc-network` when compiling my parachain node in v0.9.32
I'm compiling using the v0.9.32, any hint or solution?
error[E0433]: failed to resolve: could not find `derive_prelude` in `swarm`
--> /home/amrm/.cargo/git/checkouts/substrate-7e08433d4c370a21/...
2
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1
answer
117
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Offchain Worker Not Initializing - Cumulus Parachain Template
I am observing unexpected behavior with the Cumulus Parachain Template. Our pallet uses off-chain workers (OCW), and the functionality successfully runs when we attach it to the Substrate Node ...
- 65
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1
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197
views
How to run parachain node in Docker?
I'm trying to run a Statemint node using the parity/polkadot-parachain docker image. However, I get this error:
docker run --rm -it --entrypoint bash parity/polkadot-parachain
polkadot-parachain --...
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51
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How to add smart contracts support in parachain?
I am using Cumulus SDK for my parachain. Works well, but I need to be able to upload smart contracts into my parachain. How can I do this, Cumulus polkadot-parachain does not have smart contracts.
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177
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How are the costs of XCM messages designed?
after playing with the Substrate Cumulus Parachain Template and the ping-pallet to get an idea of how to use XCM, I built a local Rococo testnet connected to two parachains.
In my code, at some point, ...
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Issue building polkadot-parachain binary
I can't quite figure out what I am doing wrong so any help is appreciated.
git clone --depth 1 --branch polkadot-v0.9.28 https://github.com/paritytech/cumulus.git
cd cumulus
cargo build --release --...
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5
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135
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sp_trie::recorder::Recorder does not live long enough when upgrading para-chain project from polkadot-v0.9.28 to polkadot-v0.9.29
I was upgrading a para chain from polkadot version 0.9.28 to v0.9.29 when I encountered a few suspicious looking build errors originating from deep inside substrate.
To eliminate the risk of some ...
- 1,110
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36
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trait `parity_util_mem::malloc_size::MallocSizeOf` is not implemented for `unchecked_extrinsic::UncheckedExtrinsic<Address, Call, Signature, Extra>`
I was trying adding Frontier as a dependency to my parachain project...
After fixing a few errors and adding UncheckedExtrinsic & CheckedExtrinsic:
pub type UncheckedExtrinsic =
...
- 1,193
0
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1
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38
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error: failed to select a version for `parity-db`
I was trying to add Frontier as a dependency of my parachain(Substrate Cumulus based) project...
$ cargo build -r
Updating git repository `https://github.com/PNetwork/frontier`
Updating ...
- 1,193
1
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1
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77
views
How to calculate weight on cumulus
I am a bit confused about this. If I have a pr on Substrate that requires a companion on Cumulus that adds to the weight file for a given pallet, how do I calculate the weight? I can run the benchmark....
- 603
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42
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Cumulus extrinsic weight
Are the benchmarks run on the same machine in the cumulus repository as the ones in the substrate? That is, is the weight in weights.rs files the same in these two repositories?
Edit: The weights in ...
- 603
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107
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Pending Extrinsic not executed on block producing parachain
I have followed the tutorial and have reached the step where parachain is now producing and finalising block with a local relay chain. Transactions on chain and DMP (teleport asset) all works well. I ...
- 71
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142
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Sending assets from parachain to relaychain resulting in asset not found
I am trying to send assets from parachain to relaychain from polkadotXcm extrinsic reserveTransferAssets and teleportAssets in polkadotjs app, but it is giving me Asset Not Found error, I am not sure ...
2
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1
answer
97
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parachain-system can not get ParachainInherentData After runtime upgrade
Before this setCode upgrade, our parachain works well.
After setCode upgrade, we get the following error log.
Jun 02 09:39:36 Parami-AWS-SFO-DANA-01 parami[490]: 2022-06-02 09:39:36 ⚠️ ParachainSystem ...
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18
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Example of MockValidationDataInherentDataProvider usage
Is there any example of how to use MockValidationDataInherentDataProvider to run a parachain with mock validation? I've been looking all over and can't seem to find any documentation or example of it'...
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47
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What is the current state of Swappable Consensus and Re-Genesis
I've found these two open issues:
Re-Genesis #7458
Swappable Consensus #1304
and would be interested if there is more practical guidance on an example basis?
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Why is the collator node producing and finalizing blocks at such a fast rate?
I am reading the Cumulus docs on running a node:
https://github.com/paritytech/cumulus#build--launch-a-node
Why is it that when I run:
./target/release/polkadot-collator --tmp --chain westmint
...
- 8,130
2
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2
answers
67
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Parachain config for Rococo public test network
How to config a locally tested parachain to connect it to the Rococo public test-network?
I mean on the startup phase (before the Rococo Slot Request Form), following the Cumulus tutorial: after ...
- 21
5
votes
1
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243
views
How to deploy a parachain node and connect it to an existing relay chain node?
I deployed a relay chain node using the provided docker container:
docker run \
--detach \
--name=polkadot \
--volume="$(pwd)/data:/data" \
--network=host \
--entrypoint=...
- 379
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votes
1
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181
views
My parachain has not been able to issue a block after submitting the upgrade transaction
network: rococo live
this is my parachain log.
- 733
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184
views
How many collators of a registered parachain must be synchronised with the Rococo relay chain for that parachain to generate and finalize blocks?
I want to determine the minimum amount of collators that a specific parachain that is registered on the Rococo network must have running in order for them to generate and finalize blocks once they ...
- 2,292
-1
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1
answer
156
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XCM message transfer failed. relaychain report `Error: Barrier`
When I was doing cross-chain messaging (parallel chain A to parallel chain B), parallel chain A sent an XCM message (successfully). After receiving the message, the relay chain was supposed to send it ...
- 733
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2
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106
views
How to deregister a parathread?
If I want to de register a parathread I have previously registered, which steps should I follow ?
What happens with the deposit ?
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how to specify the node's telemetry name for the relay chain when running a parachain node
when running a parachain, we can specify arguments for the relay chain, by adding a double-dash (--) separator between parachain and relay chain arguments, like so:
$ calamari \
--name '🦑 marmara'...
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3
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189
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What is head data and how do I get it?
When registering a parachain on a relay-chain you need to provide something called head data (or also referred as genesis state) and wasm.
What is this head data and how do I get that?
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41
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function or associated item not found in `parachain_info::Pallet<Runtime>`
I referred to parachain_info normally, but couldn't call his get method
717 | Parachain(ParachainInfo::get().into())
| ^^^ function or ...
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1
answer
128
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How to reset a parachain with a new genesis on rococo?
I want to reset a parachain currently active on the rococo testnet. There is documentation on how to register a new parachain. But what do I need to do in order to restart an existing parachain? I ...
- 3,555
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2
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196
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How do I connect my parachain to Rococo?
I have completed the Cumulus tutorial and tested my parachain on rococo-local to work as expected. I would like to connect to the public testnet, but I don't have sudo capabilities to add my parachain....
Nuke♦
- 1,822
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203
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Docker and Substrate with Apple Silicon/M1 Chips
Getting qemu errors when trying to build cumulus/polkadot on the container with the official image FROM docker.io/paritytech/ci-linux:production as builder
qemu-x86_64: could not open '/lib64/ld-linux-...
- 1,203
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What is Cumulus?
How does Cumulus relate to Polkadot? What is the difference between the two?
Can I launch a chain without Cumulus? Are there any good documentation around the interactions between the two?
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