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chore: add TODO doc about transient apply failures [skip ci]

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erhant 2026-07-10 22:43:41 +03:00
parent 55434846d9
commit 80cd3afe0d
3 changed files with 9 additions and 4 deletions
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4
lez/chain_state/DESIGN.md
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@ -6,10 +6,6 @@ backs decentralized sequencing. Status: **interface freeze** — the
contract the produce-on-turn and follow-blocks tracks build against. Changing contract the produce-on-turn and follow-blocks tracks build against. Changing
them after the tracks split forces rework in both. them after the tracks split forces rework in both.
Branch: `erhant/lez-two-tip-chain-state` (off `erhant/indexer-recoverable-invalid-blocks`).
---
## 1. Motivation ## 1. Motivation
Decentralized sequencing requires every honest node — sequencer or indexer — to Decentralized sequencing requires every honest node — sequencer or indexer — to

3
lez/chain_state/src/apply.rs
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@ -30,6 +30,9 @@ pub enum AcceptOutcome {
/// Chained but failed to apply, possibly transiently /// Chained but failed to apply, possibly transiently
/// ([`BlockIngestError::is_retryable`]); nothing recorded, tip and state /// ([`BlockIngestError::is_retryable`]); nothing recorded, tip and state
/// untouched. The caller retries and parks once it gives up. /// untouched. The caller retries and parks once it gives up.
///
/// TODO: Only the indexer's `accept_block` emits this today; the sequencer's
/// `ChainState` parks on all failures without retrying (see `on_follow`).
RetryableFailure(BlockIngestError), RetryableFailure(BlockIngestError),
} }

6
lez/sequencer/core/src/lib.rs
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@ -355,6 +355,12 @@ impl<BP: BlockPublisherTrait> SequencerCore<BP> {
/// Feed one channel delta into the follow state and mirror it to the store: /// Feed one channel delta into the follow state and mirror it to the store:
/// revert orphaned, then apply and persist adopted and finalized blocks. /// revert orphaned, then apply and persist adopted and finalized blocks.
/// Production builds on this same head. /// Production builds on this same head.
///
/// TODO: unlike the indexer's ingest loop, this path does not retry
/// `is_retryable` (transient) apply failures — a failed block just parks and
/// relies on a valid successor or a restart. `ChainState` never emits
/// `AcceptOutcome::RetryableFailure` yet; adding retry parity here is a
/// follow-up.
fn on_follow( fn on_follow(
dbio: Arc<RocksDBIO>, dbio: Arc<RocksDBIO>,
chain: Arc<Mutex<ChainState>>, chain: Arc<Mutex<ChainState>>,