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fix: retain and reuse forester proofs across eligibility windows - #2391
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Check name Status Explanation Linked Issues check No active directly linked issue remains. Issue #2390is closed and provides historical context only. Therefore, no linked-issue coding requirements apply.Out of Scope Changes check The changes stay within the current PR scope. They implement V2 proof retention, root-linked chain reuse, bounded collection, generation-safe warmups, eligibility handling, cached-send recovery, pruni… Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly summarizes the main change: retaining and reusing forester proofs across eligibility windows.
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sergeytimoshin
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Follow-up fix: 1ecdb0a. Ready proof prefixes can now be sent while collection continues; cache entries are acknowledged only after confirmation. Cached-send errors remain typed so ForesterNotEligible triggers schedule recovery. Pending collections suppress duplicate speculative chains, out-of-order handoff retains proofs across gaps, and prover payloads no longer include the changing local sequence number. Cached-work metrics now count queue items rather than proof instructions. Validation: 70 forester library tests passed; cargo clippy -p forester --lib -- -D warnings passed; forester formatting and release build passed. Devnet canary, 2026-09-24 17:22:41–17:25:37 UTC: updated devnet-1 confirmed 5 cached-proof transactions / 2,500 queue items with zero cached-send failures and zero warming deferrals. Unchanged devnet-2 confirmed no processing transactions in the same interval and logged 84 warming deferrals. This is a short operational canary, not a controlled sustained-throughput benchmark. Promoted devnet-2 after the canary; both APIs healthy with zero container restarts on the final image. Devnet-2 subsequently confirmed a 500-item batch. Mainnet and the shared prover were not restarted. An initial host-binary/runtime glibc mismatch was rolled back and corrected before the successful canary; final image: light-forester:ready-proof-cache-1ecdb0a24-noble. |
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Actionable comments posted: 2
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Inline comments:
Review comments at @forester/src/epoch_manager.rs:
- Around line 2388-2401: Update the cached-send handling in
process_light_slot_v2 around try_send_cached_proofs so only
forester-not-eligible errors propagate and other errors are logged and retried
within the slot with backoff. Preserve the existing success and no-result
behavior, including the wait and continue after a successful cached send.
Review comments at @forester/src/processor/v2/proof_cache.rs:
- Around line 161-164: Update `ready_chain` to timestamp cached proofs and prune
entries older than `LATE_PROOF_RETENTION_TIMEOUT`, in addition to removing
proofs whose `new_root` matches the current root. In
`prewarm_all_trees_during_wait`, determine whether a cached proof links to the
fetched current root before skipping prewarming, rather than treating any
non-empty cache as warm.
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📒 Files selected for processing (5)
forester/src/epoch_manager.rsforester/src/processor/v2/processor.rsforester/src/processor/v2/proof_cache.rsforester/src/processor/v2/proof_worker.rsforester/src/processor/v2/tx_sender.rs
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Reviewed commit: 15fc4ab28e
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| ProofInput::Append(inputs) => BatchAppendInputsJson::from_inputs(inputs) | ||
| .with_tree_id(tree_id.to_string()) | ||
| .with_batch_index(batch_index) | ||
| .to_string(), |
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When multiple proof workers submit jobs for one tree, the spawned HTTP tasks can reach the prover out of sequence, so its FIFO fallback does not preserve the local seq order claimed here. Omitting batchIndex assigns these requests the legacy value -1; prover/server/server/queue.go explicitly uses nonnegative batch indices to prioritize lower batches and even prioritizes all indexed jobs over legacy jobs. This can make an expensive later proof run before the chain head—or starve these requests during a mixed-version deployment—leaving TxSender blocked on the missing predecessor. Keep ordering metadata in the request and exclude it when computing the deduplication hash server-side instead.
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Agreed this is a real ordering tradeoff, but it isn't fixed in this PR. The prover hashes the raw payload for deduplication (ComputeNetworkInputHash in prover/server/server/server.go), so sending batchIndex again would break dedup across retries and foresters. The prover first needs to exclude batch_index from the dedup hash; the forester can then restore it. Leaving this thread open for that follow-up.
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- retry recoverable cached-send failures within the light slot; only ForesterNotEligible still propagates so process_queue re-finalizes - evict cached proofs rejected by the verifier (13006) instead of retrying them every eligible slot - prune cached proofs whose old root is already in the on-chain root history, and expire unlinked proofs after the collector window - make the pending-proof scheduling gate root-aware: collections on a chain the tree has left keep retaining results but no longer block fresh proof generation - skip pre-warming only when a cached proof links to the current root - hand proofs off to the cache once the send budget is gone, including after a slot jump during the receive wait and batches the sender rejects for lack of budget Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Summary
ForesterNotEligiblepropagates) and evict cached proofs the verifier rejects (13006)Includes the two proof-retention commits from #2387, which is closed as superseded. The branch is based on current main (a67a427), which includes the Photon JSON-RPC root-URL fix #2390, epoch retry #2388, and dashboard cache #2386.
Validation (2026-10-14, head 4b61b93)
cargo test -p forester --lib: 77 tests passed, including 6 new ones (superseded-root pruning, orphan expiry, eviction, root-aware collection gate, and two TxSender budget-handoff tests).cargo clippy -p forester --lib --tests -- -D warnings: passed.cargo +nightly fmt --all -- --check: passed.Earlier validation (2026-09-29, head 15fc4ab): forester and Photon-client lib tests, clippy, fmt, TypeScript Photon transport tests in V1 and V2 mode, release build, and an Ubuntu 24.04 runtime smoke test all passed.
Devnet
getQueueElementsandgetQueueInfo, which resolves the upstream blocker found in the 2026-09-30 canary (15fc4ab on devnet-1 only; mainnet unchanged).Summary by CodeRabbit