fix(dash-spv): coalesce committed-range filter rescans across batch commits - #974
fix(dash-spv): coalesce committed-range filter rescans across batch commits#974romchornyi wants to merge 3 commits into
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…ommits The backward sweep introduced for #846 re-tested newly derived scripts against the whole committed prefix at every script-carrying batch commit. On a mainnet restore of a heavily CoinJoined wallet that meant 191 full sweeps from the same floor — 301M filter evaluations, ~14.5 minutes of a 28-minute run that jetsam then killed. Move the accumulated backward scripts from the per-batch state to the manager, and run the sweep only when the forward pipeline drains: the committing batch is the last one active and its end has reached the filter-header tip. Intermediate commits accumulate and move on, so a sync shares one walk of the stored history plus one walk per follow-up round whose recovered blocks derive genuinely new scripts. Sweep hits still attribute to the committing batch, so its pending_blocks accounting holds the commit — and with it FiltersSyncComplete — until the backward fixpoint converges, and the accumulator deliberately survives reset_for_rescan so a restarted scan still owes the committed prefix its pass. The regression test drives four batches, three of which derive new scripts at commit, through the real wallet pipeline: unmodified code runs 4 committed-range sweeps, coalesced code runs 2 (drain-time sweep plus one follow-up round), and a beyond-window block in the first committed batch must still be recovered before FiltersSyncComplete is emitted. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change moves backward-rescan script accumulation from ChangesCommitted-range rescan coordination
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change coalesces duplicate committed-range rescans during wallet restoration, reducing scan work and memory use while preserving completion of required checks; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant FiltersBatch
participant FiltersManager
participant CommittedRangeSweep
participant FiltersSyncComplete
FiltersManager->>FiltersBatch: collect derived scripts
FiltersBatch-->>FiltersManager: return scripts
FiltersManager->>FiltersManager: accumulate scripts across commits
FiltersManager->>CommittedRangeSweep: run combined sweep after forward drain
CommittedRangeSweep-->>FiltersManager: recover committed outputs
FiltersManager->>FiltersSyncComplete: emit after pending scripts clear
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In `@dash-spv/src/sync/filters/coinjoin_gap_discovery_tests.rs`:
- Around line 495-502: Before calling try_process_batch in this test, seed the
manager’s filter_header_tip_height and target_height to 399, or invoke
handle_new_filter_headers with height 399, alongside the existing stored-height
update. Preserve the quiescence and FiltersSyncComplete assertions so the test
exercises the production drain gate against matching progress tips.
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dash-spv/src/sync/filters/batch.rsdash-spv/src/sync/filters/coinjoin_gap_discovery_tests.rsdash-spv/src/sync/filters/manager.rs
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- dash-spv/src/sync/filters/batch.rs
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…s tips `setup()` leaves `filter_header_tip_height` and `target_height` at 0, so `end_height() >= filter_header_tip_height()` was trivially true and the test only ever exercised the `active_batches.len() == 1` half of the gate. `FiltersSyncComplete` was being checked against a zero target for the same reason. Both tips are now seeded to 399, matching the fixture. This does not make the height comparison itself covered, and I could not get it covered: with the comparison deleted the suite still passes. A fixture where one batch is in flight with more of the chain ahead does not reach the sweep branch at all in these tests, so an assertion there passes for the wrong reason rather than for the right one. I removed the attempt instead of keeping a test that proves nothing. What that half does in production: it separates "this is the last batch" from "this is the only batch right now", which is what keeps the sweep from firing per commit early in a scan. It is exercised by the end-to-end device run in the PR description, not by the unit suite.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## dev #974 +/- ##
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+ Coverage 76.96% 77.05% +0.09%
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Files 329 329
Lines 82676 82671 -5
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+ Hits 63631 63703 +72
+ Misses 19045 18968 -77
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I generally like the PR. Once it reaches the end it finds 6732 txs, but then it goes into high CPU usage rematching everything and downloading a ton of blocks, all false matches — none of them contain a single tx. One block around 2,300,000 does, ending at 6733 txs. I'd like to hold this PR while I investigate why that happens and, ideally, remove theunnecessary rematching. I'm also aware of a non-deterministic path in our current logic that I'm trying to pin down, it may be related. |
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Coordination note from #979: that PR's durable pending-sweep commit persists the backward-sweep obligation across process death (Android LMK kills mid-restore were losing it — funds stayed invisible until a manual rescan), and it currently hooks the per-batch No objection to this PR — the numbers speak for themselves, and deferring sweeps actually makes the durable obligation more valuable (a crash before the single end-of-sync sweep now erases all accumulated scripts instead of one batch's). Proposal in #979: this PR lands first, and #979 rebases its durability onto the manager-level accumulator — persist on entry, clear at the commit of the batch your sweep-found blocks charge. One thing worth keeping in mind here: 🤖 Generated with Claude Code |
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Issue being fixed or feature implemented
Restoring a wallet with a long history never finishes on a phone. Measured on an iPhone 13 Pro, iOS 18.7.8, mainnet, restoring a heavily-CoinJoined wallet whose history starts at block 1,129,171: the app ran for 28 minutes, reached ~94%, then crawled and was killed by jetsam at a 2.9 GB footprint. The durable watermark never got past 2,443,000.
The cause is the #846 backward sweep. When a batch commit carries newly derived scripts, those scripts must also be tested against ranges that already committed — nothing else ever looks below
committed_heightagain. That sweep was accumulated per batch and run at every script-carrying commit, and each run walks the whole committed prefix:191 sweeps, every one starting at 200,000 — one unique start height in the whole run. Their ranges sum to 301,253,191 block-filter evaluations, average span 1,577,241. Roughly 14.5 of the 28 minutes were spent inside
rescan_committed_range, single sweeps up to 158 s, and the sync task is blocked for the duration while the network keeps delivering.The forward
rescan_batchpath is not the problem and is untouched here: 465 events over 245 unique 5000-block spans, in memory, max 8 repeats of any range.What was done?
The accumulator moves from the batch to the manager (
FiltersManager::backward_scripts), andtry_commit_batchesruns the sweep only once the forward pipeline has drained — the committing batch is the sole entry inactive_batchesand its end has reached the filter-header tip, so no lookahead can be created past it. Intermediate commits accumulate and commit without sweeping. The per-batch field and its accessors are gone.earliest_required_height()and the 200,000 floor are deliberately NOT touched. That floor looks too low, but the wallet genuinely has transactions from 1,129,171 and raising it would lose them; narrowing the span is a separate question from removing the repetition.#846's guarantee is preserved, not weakened. Every newly derived script is still tested against the full committed range before sync completes — the test is deferred, never skipped. Sweep-found blocks charge the committing batch's
pending_blocks, so that batch cannot commit andFiltersSyncCompletecannot fire while the work is outstanding.reset_for_rescankeeps the accumulator, where the old per-batch state was silently dropped.How Has This Been Tested?
committed_range_sweep_coalesces_across_batch_commits— realWalletManager, real BIP-158 filters, four batches, three deriving new scripts at commit, plus a beyond-window block in the first-committed batch (the #846 shape). It asserts both halves: that the sweeps coalesce, and that at the momentFiltersSyncCompleteis emitted the beyond-window block's indices are already marked used.Falsifiable, and checked both ways:
dev: fails — "got 4 sweeps"forward_drainedgate: fails the same waycargo test -p dash-spv --lib— 560 passed, 0 failed, 2 ignored.cargo fmt --checkandcargo clippy --all-targetsclean.End-to-end on the device that produced the bug, same wallet, restore from seed:
Comparing txid sets rather than counts, the pre-fix run was missing 425 transactions that the fixed run found — and because its watermark had passed them, nothing would ever have rescanned that range.
Breaking Changes
None. Internal scheduling of an existing sweep; no API, storage format, or wire change.
Checklist
For repository code-owners and collaborators only
Summary by CodeRabbit
Bug Fixes
Tests