feat(snapshotter): deduplicate RocksDB proofs SSTs - #4915
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🟡 Heimdall Review Status
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✅ All benchmarks green — 14 within ±2% (deterministic instruction counts). View run Benchmark details (14)
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| for entry in entries { | ||
| if Self::verify_outputs(target_dir, &entry.output_files)? { | ||
| info!(target: "reth::cli", file = %entry.file_name, "Reusing verified proofs snapshot artifact"); | ||
| continue; | ||
| } | ||
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| Self::cleanup_outputs(target_dir, &entry.output_files); | ||
| let archive_path = Self::download_archive(&entry, &cache_dir).await?; | ||
| Self::extract_tar_zst(&archive_path, target_dir)?; | ||
| tokio::fs::remove_file(&archive_path).await.ok(); | ||
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| Self::extract_and_cleanup(&archive_path, target_dir, &cache_dir).await | ||
| if !Self::verify_outputs(target_dir, &entry.output_files)? { | ||
| Self::cleanup_outputs(target_dir, &entry.output_files); | ||
| eyre::bail!( | ||
| "proofs archive extracted but output verification failed: {}", | ||
| entry.file_name | ||
| ); | ||
| } | ||
| } |
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Issue: Blocking I/O on the async runtime
Both verify_outputs (line 165, 175) and extract_tar_zst (line 172) perform synchronous file I/O — verify_outputs reads and BLAKE3-hashes every output file, and extract_tar_zst decompresses an entire tar.zst archive. Calling these directly from the async run_from_manifest method blocks the tokio runtime thread.
The previous implementation wrapped extract_tar_zst in tokio::task::spawn_blocking, which was removed in this refactor. For SST files that may be hundreds of megabytes, the blocking time is significant.
Consider wrapping these calls in spawn_blocking:
let target = target_dir.to_path_buf();
let outputs = entry.output_files.clone();
let verified = tokio::task::spawn_blocking(move || Self::verify_outputs(&target, &outputs)).await??;and similarly for extract_tar_zst.
| .get("size") | ||
| .and_then(|s| s.as_u64()) | ||
| .ok_or_else(|| eyre::eyre!("proofs component missing 'size' field in manifest"))?; | ||
| let archive_base_url = manifest.base_url.as_deref().unwrap_or_else(|| { |
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Nit: fallback base URL from manifest_url can produce an invalid URL when the manifest path has no /
rsplit_once('/') returns None when the manifest URL has no / path separator, causing the fallback to be the entire manifest_url string (e.g. "http://example.com"). Then on line 245 the trailing-slash fixup and Url::join would work, but the intent of the fallback — stripping the manifest.json leaf — would silently produce the wrong base. This is an existing pre-PR edge case and practically unreachable, just noting it.
| } | ||
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| #[derive(Debug, Deserialize)] | ||
| struct ProofsDownloadManifest { |
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Nit: Duplicate ProofsStaticManifest type
This file defines its own ProofsStaticManifest (Deserialize-only) at line 115, while base_snapshotter::snapshot already exports a public ProofsStaticManifest with both Serialize and Deserialize. The download crate already depends on base-snapshotter indirectly through reth_cli_commands.
If there's no dependency constraint preventing it, reusing the snapshotter's type would keep the manifest schema in one place. If these crates intentionally don't depend on each other, at minimum consider adding a comment noting the parallel definition.
Review SummaryThe PR cleanly splits the monolithic proofs archive into immutable SST archives (content-addressed, shared across runs) and per-run mutable metadata. The manifest extension approach ( FindingsBlocking I/O on the async runtime ( Duplicate type definition ( Design Observations (non-blocking)
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| Self::cleanup_outputs(target_dir, &entry.output_files); | ||
| let archive_path = Self::download_archive(&entry, &cache_dir).await?; | ||
| Self::extract_tar_zst(&archive_path, target_dir)?; |
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Issue: extract_tar_zst no longer validates tar entry paths against output_files
The previous implementation used a fixed, single-component filename validated before extraction. Now, extraction uses archive.unpack(target_dir) which writes whatever paths are in the tar, while output_files is only checked after extraction in verify_outputs.
A malicious or corrupted manifest could declare output_files as ["proofs/000001.sst"] but package a tar containing proofs/000001.sst plus additional unexpected files (e.g., proofs/LOCK or other files outside the declared set). These extra files would be written to disk but never verified or cleaned up by cleanup_outputs (which only removes declared output_files).
Consider either:
- Validating that extracted entries match
output_filesexactly (rejecting unexpected entries), or - Extracting into a temporary directory first, verifying, then moving only the declared files.
Review SummaryThis PR splits the monolithic RocksDB proofs snapshot into immutable SST table archives and per-run metadata archives, with BLAKE3-based deduplication on the download side and content-addressed SST deduplication on the upload side. The architecture is sound — immutable SSTs are shared across runs, and only mutable RocksDB metadata is re-downloaded. Findings1. Blocking I/O on the async runtime (existing finding, confirmed) 2. Tar extraction writes undeclared files without cleanup (new finding, inline comment posted) 3. Duplicate Positive observations
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Review Summary —
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2 participants
Summary
proofs_staticmanifest extension so existing SSTs are skipped during later snapshot runsbase snapshot download --proofsto restore, verify, and reuse the incremental proof artifactsTesting
cargo test -p base-snapshotter --lib --no-fail-fastcargo test -p base-execution-cli commands::download::tests --no-fail-fastcargo test -p base-execution-cli commands::download::tests::generated_fake_rocksdb_proofs_snapshot_restores_end_to_end -- --nocapturecargo clippy -p base-snapshotter --all-targets -- -D warningscargo clippy -p base-execution-cli --all-targets -- -D warnings