"Cumulus clouds are shaped sort of like dots; together they form a system that is intricate, beautiful and functional."
Cumulus is an extension to Substrate that makes it easy to make any Substrate built runtime into a Polkadot-compatible parachain. See the Overview for a more technical but still high-level description of Cumulus.
Cumulus Consensus is a consensus engine for Substrate that follows a Polkadot Relay Chain (i.e., parachains). This will run a Polkadot node internally, and dictate to the client and synchronization algorithms which chain to follow, finalize, and treat as correct.
A wrapper around Substrate runtimes to allow them to be validated by Polkadot validators and provide witness generating routines. It adds a
validate_block API to the Substrate external interface, which will be called by validators.
将它集成到 substrate runtime 就像导入 crate 包并将这一行宏添加到代码中一样简单。
A Polkadot collator for a parachain is implemented in the Cumulus repository here.
The Rococo testnet (available via Polkadot-JS) is the testnet set aside specifically for parachains.