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add more notes on changing epoch duration (#8491)

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* add more notes on changing epoch duration

* add note about changing slot duration
This commit is contained in:
Alexander Popiak
2021-04-06 12:09:04 +02:00
committed by GitHub
parent 00432a5ab7
commit bf8a1d8a1a
3 changed files with 8 additions and 0 deletions
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substrate/bin/node/runtime/src/constants.rs
+4
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@@ -54,11 +54,15 @@ pub mod time {
pub const MILLISECS_PER_BLOCK: Moment = 3000;
pub const SECS_PER_BLOCK: Moment = MILLISECS_PER_BLOCK / 1000;
// NOTE: Currently it is not possible to change the slot duration after the chain has started.
// Attempting to do so will brick block production.
pub const SLOT_DURATION: Moment = MILLISECS_PER_BLOCK;
// 1 in 4 blocks (on average, not counting collisions) will be primary BABE blocks.
pub const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
// NOTE: Currently it is not possible to change the epoch duration after the chain has started.
// Attempting to do so will brick block production.
pub const EPOCH_DURATION_IN_BLOCKS: BlockNumber = 10 * MINUTES;
pub const EPOCH_DURATION_IN_SLOTS: u64 = {
const SLOT_FILL_RATE: f64 = MILLISECS_PER_BLOCK as f64 / SLOT_DURATION as f64;
substrate/bin/node/runtime/src/lib.rs
+2
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@@ -326,6 +326,8 @@ impl pallet_scheduler::Config for Runtime {
}
parameter_types! {
// NOTE: Currently it is not possible to change the epoch duration after the chain has started.
// Attempting to do so will brick block production.
pub const EpochDuration: u64 = EPOCH_DURATION_IN_SLOTS;
pub const ExpectedBlockTime: Moment = MILLISECS_PER_BLOCK;
pub const ReportLongevity: u64 =