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perf(dash-spv): segment size per type - #1092
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📝 WalkthroughWalkthroughPersistable types define per-segment capacities, and segment filenames use six-digit zero-padding. A new version-2 migration converts legacy four-digit segment files across four storage folders. The migration runner applies V2Migrator, and filename expectations and parser tests reflect the updated format. ChangesStorage Segment Migration
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant MigrationVersionLoop
participant V2Migrator
participant StorageFolder
participant BlockingWorkers
participant TmpStagingDirectory
MigrationVersionLoop->>V2Migrator: Run version 2 migration
V2Migrator->>StorageFolder: Discover legacy and current segment files
V2Migrator->>BlockingWorkers: Split legacy segment contents
BlockingWorkers->>TmpStagingDirectory: Write staged segments
V2Migrator->>StorageFolder: Move staged segments and delete legacy files
Merge Risk: 🟡 Moderate · up to Resolve truncated-item handling before merging: an incomplete legacy item is silently discarded during migration rather than triggering corruption recovery. Segment capacities, sentinel layouts, and migration ordering otherwise appear compatible. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The migration preserves item positions, but interrupted conversion can trigger deletion of the wider storage directory rather than resume safely. Truncated legacy records can also be accepted before their source files are deleted. Existing access locks and staged writes reduce some risks, but do not make the upgrade transactional. Retained concerns
Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Every segment cache held 50 000 items, whatever an item costs. Near the tip a block segment holds tens of MB of decoded blocks, while a header segment spanning the same heights is 5.6 MB and a filter header one 1.6 MB. `Persistable::ITEMS_PER_SEGMENT` lets each type choose: headers 10 000 (~1.1 MB per segment), filter headers 50 000 (~1.6 MB), filters 2 000 (~2 MB near the tip) and blocks 1 000. This changes the on-disk layout of the header, filter and block segments. Storage written with 50 000-item segments is misread by this layout and has to be deleted until a migration or a versioned folder lands. Mainnet restore, mainnet.100mbi.100ms, #1015/#1016/#1014 applied, two resident segments, jemalloc heap profiling, wallet identical in every run (14114383 sat, 7112 records, 13389 addresses): segment items time peak RSS segment caches 50 000 for every type 7.0 min 818 MiB 332 MiB 5 000 for every type 7.3-8.3 min 554-687 MiB 23-106 MiB 1 000 for every type 9.2-12.2 min 453-577 MiB 2-66 MiB per type (this commit) 7.5 min 538 MiB 38 MiB With 1 000 items everywhere, the header and filter header phases paid an fsync per evicted segment (105-141 s and 254-332 s instead of ~60 s and ~150 s). Blocks at 500 items saved ~18 MiB of cache but reloaded 50 % more block segments. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017DruChNTWXwJoWPartZwCf
Nothing outside `storage` implements or names the trait, and the `segments` module it lives in is private to `storage` already. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017DruChNTWXwJoWPartZwCf
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## dev #1092 +/- ##
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- Coverage 77.49% 77.38% -0.12%
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Files 318 319 +1
Lines 81134 81274 +140
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+ Hits 62877 62892 +15
- Misses 18257 18382 +125
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Storage version 2. Segment files move from 50_000 items each to the per-type sizes (block headers 10_000, filter headers 50_000, filters 2_000, blocks 1_000), and segment ids in file names are padded to 6 digits instead of 4, since the smaller segments push ids past 9999. The migration keeps its own frozen copy of the legacy and new layouts (names, items per segment, item encodings and sentinels) and copies raw item bytes, so it does not depend on the storage code as it evolves. Each folder is rebuilt in <storage>/tmp/<folder>, swapped in through tmp/<folder>.old, and tmp/ is removed before the next folder, so the extra disk space at any time is one folder. An interrupted run either finishes the swap or rebuilds the folder from the untouched legacy files. New segments holding only sentinels are not written: an all-sentinel segment with the highest id would make load_or_new report no tip. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…check Recovery no longer tracks a swap state: the migration deletes <storage>/tmp on start, migrates every folder that still holds 4-digit segment files and skips folders that only hold 6-digit ones. Staged segments are moved into the folder file by file and the legacy files are deleted last, so every 6-digit file in a folder is complete and rebuilding from the remaining legacy files reproduces the same files. The sentinel check looks at one field per item type (version i32::MAX for headers and blocks, an all-zero filter header, an empty filter). It is still needed: on a dev V1 mainnet storage the last new filters segment is all sentinels, and writing it made the client load a filter tip of 0 and download every filter again from height 200000. Checked on that storage (synced by dev to 2547714): the client resumes at the tip, every new file equals its slice of the legacy file and every skipped slice is only sentinels, and a SIGKILL mid-migration followed by a restart yields identical files. Blocks skip 771 of 2350 segments (523 -> 443 MiB). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…olders as corruption Each folder is migrated by its own tokio task, and inside it WORKERS_PER_FOLDER spawn_blocking workers split the legacy segments (worker n takes legacy ids n, n + 4, ...). The split stays the streaming, blocking code: reading whole legacy files through tokio::fs would hold up to ~600 MB at once (filters files reach 61 MB, blocks 88 MB). Recovery is now: delete <storage>/tmp on start, skip folders that only hold 6-digit segment files, and return Corruption for a folder holding both 4-digit and 6-digit files, which wipes the storage. On a dev V1 mainnet storage (cold page cache, this server) the migration took 41-46 s sequentially and 4-17 s now. Almost all of it is the per-file fsync, which stays: without it the whole migration takes ~2 s because writes only reach the page cache, and the legacy files are deleted right after. Deferring the fsyncs until all files are written was slower. Bytes were verified against the legacy files, a SIGKILL mid-migration followed by a restart migrates correctly, and a mixed folder wipes the storage and syncs again from the checkpoint. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Review comments at @dash-spv/src/storage/migrator/v2.rs:
- Around line 232-279: Update the UnexpectedEof handling in read_item so it
returns Ok(None) only when tee.bytes is empty; treat EOF after consuming any
bytes as MigratorError::Corruption, preserving the existing error context.
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dash-spv/src/storage/filters.rsdash-spv/src/storage/migrator/mod.rsdash-spv/src/storage/migrator/v2.rsdash-spv/src/storage/segments.rs
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`read_item` took every `UnexpectedEof` as the clean end of a legacy segment, including one hit after part of an item was read. The truncated segment was then migrated and its legacy file deleted, losing the tail silently. Only an EOF before the first byte of an item ends the segment now; anything else is `MigratorError::Corruption`, which clears the storage for a resync. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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PR Hygiene ·
a6a2818/skip-botsproceeds without the ones not yet reported/self-reviewedonce the bots are donedash-spv(dash-spv/src/storage/filters.rs,dash-spv/src/storage/migrator/mod.rs,dash-spv/src/storage/migrator/v2.rsand 1 more) — QuantumExplorer or xdustinfaceWhen every box is checked the
PR Hygienecheck passes and this can merge.Summary by CodeRabbit