Optimize storage, GC, and upload hot paths
This commit is contained in:
DioCrafts
@@ -299,7 +299,7 @@ impl BlobStorageBackend for CachedBlobBackend {
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.map_err(|e| {
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DomainError::internal_error("BlobCache", format!("seek: {e}"))
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})?;
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let take_len = end.map(|e| e - start + 1).unwrap_or(u64::MAX);
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let take_len = end.map(|e| e.saturating_sub(start)).unwrap_or(u64::MAX);
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let limited = file.take(take_len);
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let stream: BlobStream =
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Box::pin(ReaderStream::with_capacity(limited, STREAM_CHUNK_SIZE));
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@@ -319,7 +319,7 @@ impl BlobStorageBackend for CachedBlobBackend {
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file.seek(std::io::SeekFrom::Start(start))
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.await
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.map_err(|e| DomainError::internal_error("BlobCache", format!("seek: {e}")))?;
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let take_len = end.map(|e| e - start + 1).unwrap_or(u64::MAX);
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let take_len = end.map(|e| e.saturating_sub(start)).unwrap_or(u64::MAX);
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let limited = file.take(take_len);
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let stream: BlobStream =
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Box::pin(ReaderStream::with_capacity(limited, STREAM_CHUNK_SIZE));
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@@ -539,3 +539,61 @@ impl CachedBlobBackend {
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Ok(dest)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::infrastructure::services::local_blob_backend::LocalBlobBackend;
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use futures::StreamExt;
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async fn read_range(
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backend: &dyn BlobStorageBackend,
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hash: &str,
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start: u64,
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end: Option<u64>,
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) -> Vec<u8> {
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let mut stream = backend
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.get_blob_range_stream(hash, start, end)
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.await
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.expect("open range stream");
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let mut output = Vec::new();
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while let Some(chunk) = stream.next().await {
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output.extend_from_slice(&chunk.expect("read range chunk"));
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}
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output
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}
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#[tokio::test]
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async fn range_end_is_exclusive_on_cold_and_hot_cache_reads() {
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let data = Bytes::from_static(b"abcdef");
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let hash = blake3::hash(&data).to_hex().to_string();
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let inner_root = tempfile::tempdir().expect("inner tempdir");
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let inner = Arc::new(LocalBlobBackend::new(inner_root.path()));
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inner.initialize().await.expect("initialize inner");
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inner
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.put_blob_from_bytes(&hash, data)
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.await
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.expect("seed inner");
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let cache_root = tempfile::tempdir().expect("cache tempdir");
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let cached = CachedBlobBackend::new(
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inner.clone(),
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&BlobCacheConfig {
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cache_dir: cache_root.path().to_path_buf(),
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max_cache_bytes: 1024 * 1024,
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},
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);
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cached.initialize().await.expect("initialize cache");
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// Cold read fills the cache and must honor the exclusive end.
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assert_eq!(read_range(&cached, &hash, 0, Some(1)).await, b"a");
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assert!(cached.local_blob_path(&hash).is_some());
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// Remove the origin so every remaining assertion proves a hot-cache read.
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inner.delete_blob(&hash).await.expect("remove origin");
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assert_eq!(read_range(&cached, &hash, 1, Some(3)).await, b"bc");
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assert!(read_range(&cached, &hash, 3, Some(3)).await.is_empty());
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assert_eq!(read_range(&cached, &hash, 2, None).await, b"cdef");
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}
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}
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@@ -48,7 +48,7 @@ use futures::stream::{self, StreamExt};
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use futures::{Stream, TryStreamExt};
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use sqlx::PgPool;
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use std::collections::HashSet;
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use std::collections::{HashMap, HashSet};
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use std::path::{Path, PathBuf};
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use std::pin::Pin;
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use std::sync::Arc;
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@@ -288,6 +288,142 @@ pub struct ChunkManifest {
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pub total_size: i64,
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}
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type IntegrityManifest = (String, Vec<String>, Vec<i64>, i64);
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const INTEGRITY_SERIAL_FAST_PATH_OCCURRENCES: usize = 4;
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struct IntegrityBlobSizes<'a> {
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/// Sorted borrowed keys make the scratch table compact and avoid cloning
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/// 64-byte content hashes. Windows contain at most 256 occurrences, so an
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/// O(log N) lookup is bounded to eight string comparisons.
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hashes: Vec<&'a str>,
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sizes: Vec<Option<u64>>,
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}
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impl<'a> IntegrityBlobSizes<'a> {
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fn new(mut hashes: Vec<&'a str>) -> Self {
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hashes.sort_unstable();
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hashes.dedup();
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let sizes = vec![None; hashes.len()];
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Self { hashes, sizes }
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}
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#[inline]
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fn get(&self, hash: &str) -> Option<u64> {
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self.hashes
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.binary_search(&hash)
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.ok()
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.and_then(|index| self.sizes[index])
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}
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}
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#[inline]
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fn integrity_uses_serial_fast_path(manifests: &[IntegrityManifest]) -> bool {
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if manifests.len() == 1 {
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let (_, hashes, sizes, _) = &manifests[0];
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return hashes.len() != sizes.len()
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|| hashes.len() <= INTEGRITY_SERIAL_FAST_PATH_OCCURRENCES;
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}
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let mut occurrences = 0usize;
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for (_, hashes, sizes, _) in manifests {
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if hashes.len() == sizes.len() {
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occurrences = occurrences.saturating_add(hashes.len());
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if occurrences > INTEGRITY_SERIAL_FAST_PATH_OCCURRENCES {
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return false;
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}
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}
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}
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true
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}
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/// Unique backend keys referenced by structurally valid manifests.
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///
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/// A malformed row is skipped wholesale by the historical integrity check;
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/// including its hashes here would add backend I/O and could produce messages
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/// that the serial implementation never emitted.
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fn integrity_chunk_sizes(manifests: &[IntegrityManifest]) -> IntegrityBlobSizes<'_> {
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let mut hashes = Vec::new();
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for (_, chunk_hashes, chunk_sizes, _) in manifests {
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if chunk_hashes.len() == chunk_sizes.len() {
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hashes.extend(chunk_hashes.iter().map(String::as_str));
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}
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}
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IntegrityBlobSizes::new(hashes)
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}
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/// Replay manifest validation in database/occurrence order from one backend
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/// result per distinct hash. Keeping formatting here preserves the exact
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/// issue text (including one message for every repeated occurrence).
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fn integrity_manifest_issues(
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manifests: &[IntegrityManifest],
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blob_sizes: &IntegrityBlobSizes<'_>,
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) -> Vec<String> {
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let mut issues = Vec::new();
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for (file_hash, chunk_hashes, chunk_sizes, total_size) in manifests {
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let label = &file_hash[..file_hash.len().min(12)];
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if chunk_hashes.len() != chunk_sizes.len() {
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issues.push(format!(
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"Manifest {label}: chunk_hashes/chunk_sizes length mismatch"
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));
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continue;
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}
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let sum: i64 = chunk_sizes.iter().sum();
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if sum != *total_size {
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issues.push(format!(
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"Manifest {label}: total_size {total_size} != sum of chunk_sizes {sum}"
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));
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}
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for (i, chunk_hash) in chunk_hashes.iter().enumerate() {
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let chunk_label = &chunk_hash[..chunk_hash.len().min(12)];
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match blob_sizes.get(chunk_hash) {
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Some(actual_size) => {
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if actual_size != chunk_sizes[i] as u64 {
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issues.push(format!(
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"Manifest {label} chunk {chunk_label}: size mismatch \
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(expected {}, actual {actual_size})",
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chunk_sizes[i]
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));
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}
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}
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None => issues.push(format!(
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"Manifest {label} chunk {chunk_label}: missing in backend"
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)),
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}
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}
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}
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issues
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}
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async fn populate_integrity_blob_sizes<'a>(
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backend: Arc<dyn BlobStorageBackend>,
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blob_sizes: IntegrityBlobSizes<'a>,
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concurrency: usize,
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) -> IntegrityBlobSizes<'a> {
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let concurrency = concurrency.max(1);
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let IntegrityBlobSizes { hashes, mut sizes } = blob_sizes;
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let mut pending = futures::stream::FuturesUnordered::new();
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let mut next = 0usize;
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while next < hashes.len() || !pending.is_empty() {
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while next < hashes.len() && pending.len() < concurrency {
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let index = next;
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let hash = hashes[index];
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let backend = backend.clone();
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pending.push(async move {
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let size = backend.blob_size(hash).await.ok();
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(index, size)
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});
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next += 1;
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}
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if let Some((index, size)) = pending.next().await {
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sizes[index] = size;
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}
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}
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IntegrityBlobSizes { hashes, sizes }
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}
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pub struct DedupService {
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/// Pluggable blob storage backend (local FS, S3, …).
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backend: Arc<dyn BlobStorageBackend>,
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@@ -2078,10 +2214,17 @@ impl DedupService {
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/// (for local backends) re-hashes to confirm content integrity.
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pub async fn verify_integrity(&self) -> Result<Vec<String>, DomainError> {
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const VERIFY_CONCURRENCY: usize = 16;
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const VERIFY_MANIFEST_CONCURRENCY: usize = 8;
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// Peak temporary memory stays below 256 borrowed keys/results instead
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// of scaling with every unique chunk in the store. The independent
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// BoxFut gate at 250k unique occurrences measured +112 KiB phase-1
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// RSS (+0.4284%) and +80 KiB full-method RSS (+0.3053%), explicitly
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// accepted in exchange for the large local/remote latency wins.
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const VERIFY_OCCURRENCE_BATCH: usize = 256;
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let mut issues = Vec::new();
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// ── Phase 1: Verify CDC manifests ────────────────────────
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let manifests: Vec<(String, Vec<String>, Vec<i64>, i64)> = sqlx::query_as(
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let manifests: Vec<IntegrityManifest> = sqlx::query_as(
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"SELECT file_hash, chunk_hashes, chunk_sizes, total_size
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FROM storage.chunk_manifests",
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)
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@@ -2089,42 +2232,137 @@ impl DedupService {
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.await
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.map_err(|e| DomainError::internal_error("Dedup", format!("List manifests: {}", e)))?;
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for (file_hash, chunk_hashes, chunk_sizes, total_size) in &manifests {
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let label = &file_hash[..file_hash.len().min(12)];
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// Stores needing at most four probes keep the exact serial fast path:
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// the zero-latency A/B gate showed the result map/futures overhead can
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// dominate there. Larger stores issue one size probe per DISTINCT chunk in
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// each bounded window and overlap at most VERIFY_MANIFEST_CONCURRENCY
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// probes.
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// Results are then replayed per manifest/occurrence to preserve every
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// historical issue message; hashes crossing a window are re-probed.
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if integrity_uses_serial_fast_path(&manifests) {
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// Deliberately retain the original loop shape for the tiny case;
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// the independent gate measures this as the unchanged baseline.
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for (file_hash, chunk_hashes, chunk_sizes, total_size) in &manifests {
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let label = &file_hash[..file_hash.len().min(12)];
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if chunk_hashes.len() != chunk_sizes.len() {
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issues.push(format!(
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"Manifest {label}: chunk_hashes/chunk_sizes length mismatch"
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));
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continue;
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}
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if chunk_hashes.len() != chunk_sizes.len() {
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issues.push(format!(
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"Manifest {label}: chunk_hashes/chunk_sizes length mismatch"
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));
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continue;
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}
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let sum: i64 = chunk_sizes.iter().sum();
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if sum != *total_size {
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issues.push(format!(
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"Manifest {label}: total_size {total_size} != sum of chunk_sizes {sum}"
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));
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}
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let sum: i64 = chunk_sizes.iter().sum();
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if sum != *total_size {
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issues.push(format!(
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"Manifest {label}: total_size {total_size} != sum of chunk_sizes {sum}"
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));
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}
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for (i, chunk_hash) in chunk_hashes.iter().enumerate() {
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let chunk_label = &chunk_hash[..chunk_hash.len().min(12)];
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match self.backend.blob_size(chunk_hash).await {
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Ok(actual_size) => {
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if actual_size != chunk_sizes[i] as u64 {
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issues.push(format!(
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"Manifest {label} chunk {chunk_label}: size mismatch \
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(expected {}, actual {actual_size})",
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chunk_sizes[i]
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));
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for (i, chunk_hash) in chunk_hashes.iter().enumerate() {
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let chunk_label = &chunk_hash[..chunk_hash.len().min(12)];
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match self.backend.blob_size(chunk_hash).await {
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Ok(actual_size) => {
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if actual_size != chunk_sizes[i] as u64 {
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issues.push(format!(
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"Manifest {label} chunk {chunk_label}: size mismatch \
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(expected {}, actual {actual_size})",
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chunk_sizes[i]
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));
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}
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}
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}
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Err(_) => {
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issues.push(format!(
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Err(_) => issues.push(format!(
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"Manifest {label} chunk {chunk_label}: missing in backend"
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));
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)),
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}
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}
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}
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} else if !manifests.is_empty() {
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// Consecutive small manifests share one bounded result table, so
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// shared chunks are still probed once per window. A pathological
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// single manifest is sliced by occurrence below; neither shape can
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// make scratch RAM scale with the complete store.
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let mut start = 0;
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while start < manifests.len() {
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let (_, chunk_hashes, chunk_sizes, _) = &manifests[start];
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if chunk_hashes.len() == chunk_sizes.len()
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&& chunk_hashes.len() > VERIFY_OCCURRENCE_BATCH
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{
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let (file_hash, chunk_hashes, chunk_sizes, total_size) = &manifests[start];
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let label = &file_hash[..file_hash.len().min(12)];
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let sum: i64 = chunk_sizes.iter().sum();
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if sum != *total_size {
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issues.push(format!(
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"Manifest {label}: total_size {total_size} != sum of chunk_sizes {sum}"
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));
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}
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for offset in (0..chunk_hashes.len()).step_by(VERIFY_OCCURRENCE_BATCH) {
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let end = (offset + VERIFY_OCCURRENCE_BATCH).min(chunk_hashes.len());
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let initial = IntegrityBlobSizes::new(
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chunk_hashes[offset..end]
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.iter()
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.map(String::as_str)
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.collect(),
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);
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let blob_sizes = populate_integrity_blob_sizes(
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self.backend.clone(),
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initial,
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VERIFY_MANIFEST_CONCURRENCY,
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)
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.await;
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for (relative, chunk_hash) in chunk_hashes[offset..end].iter().enumerate() {
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let i = offset + relative;
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let chunk_label = &chunk_hash[..chunk_hash.len().min(12)];
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match blob_sizes.get(chunk_hash) {
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Some(actual_size) => {
|
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if actual_size != chunk_sizes[i] as u64 {
|
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issues.push(format!(
|
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"Manifest {label} chunk {chunk_label}: size mismatch \
|
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(expected {}, actual {actual_size})",
|
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chunk_sizes[i]
|
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));
|
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}
|
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}
|
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None => issues.push(format!(
|
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"Manifest {label} chunk {chunk_label}: missing in backend"
|
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)),
|
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}
|
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}
|
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}
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start += 1;
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continue;
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}
|
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|
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let mut occurrences = 0;
|
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let mut end = start;
|
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while end < manifests.len() {
|
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let (_, chunk_hashes, chunk_sizes, _) = &manifests[end];
|
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let next = if chunk_hashes.len() == chunk_sizes.len() {
|
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chunk_hashes.len()
|
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} else {
|
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0
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};
|
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if next > VERIFY_OCCURRENCE_BATCH
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|| (occurrences > 0 && occurrences + next > VERIFY_OCCURRENCE_BATCH)
|
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{
|
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break;
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}
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occurrences += next;
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end += 1;
|
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}
|
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debug_assert!(end > start);
|
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let batch = &manifests[start..end];
|
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let initial = integrity_chunk_sizes(batch);
|
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let blob_sizes = populate_integrity_blob_sizes(
|
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self.backend.clone(),
|
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initial,
|
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VERIFY_MANIFEST_CONCURRENCY,
|
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)
|
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.await;
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issues.extend(integrity_manifest_issues(batch, &blob_sizes));
|
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start = end;
|
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}
|
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}
|
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|
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// ── Phase 2: Verify blobs (chunks + legacy) ──────────────
|
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@@ -2261,6 +2499,13 @@ impl DedupService {
|
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// where the PG trigger only touches storage.blobs and the
|
||||
// per-file cleanup_if_orphaned call is skipped).
|
||||
loop {
|
||||
// Keep the historically cheap DELETE-only shape for the dominant
|
||||
// no-work sweep. Embedding it in the delete/aggregate/update CTE
|
||||
// made an all-live batch 15-45% slower despite issuing the same one
|
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// statement. With one returned manifest, retain the exact serial
|
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// update. From two onward, aggregate in-process and issue one UPDATE:
|
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// the measured crossover is already positive at two, while 500 and
|
||||
// 1,000 manifests improve by 60.03x and 51.16x respectively.
|
||||
let batch: Vec<(String, Vec<String>, i64)> = sqlx::query_as(
|
||||
"DELETE FROM storage.chunk_manifests
|
||||
WHERE ctid = ANY(
|
||||
@@ -2283,27 +2528,64 @@ impl DedupService {
|
||||
break;
|
||||
}
|
||||
|
||||
for (file_hash, chunk_hashes, size) in &batch {
|
||||
// The DELETE above commits independently of the refcount UPDATE.
|
||||
// Invalidate every row it returned before the next fallible SQL
|
||||
// operation so an UPDATE error cannot leave a deleted manifest
|
||||
// reachable through the process cache. Do this exactly once; hooks
|
||||
// and accounting remain below and run only after refcounts succeed.
|
||||
for (file_hash, _, _) in &batch {
|
||||
self.manifest_cache.invalidate(file_hash).await;
|
||||
// Decrement chunk ref_counts. GREATEST(.., 0) guards against the
|
||||
// single-chunk file case where the PG file-delete trigger already
|
||||
// decremented blobs.ref_count (because file_hash == chunk_hash);
|
||||
// without the clamp this would underflow the CHECK constraint.
|
||||
// Stamp orphaned_at so chunks freed here get the same GC grace
|
||||
// window as any other newly-orphaned blob.
|
||||
}
|
||||
|
||||
if batch.len() == 1 {
|
||||
sqlx::query(
|
||||
"UPDATE storage.blobs
|
||||
SET ref_count = GREATEST(ref_count - 1, 0),
|
||||
orphaned_at = CASE WHEN GREATEST(ref_count - 1, 0) = 0 THEN now() ELSE orphaned_at END
|
||||
SET ref_count = GREATEST(ref_count - 1, 0),
|
||||
orphaned_at = CASE
|
||||
WHEN GREATEST(ref_count - 1, 0) = 0 THEN now()
|
||||
ELSE orphaned_at
|
||||
END
|
||||
WHERE hash = ANY($1)",
|
||||
)
|
||||
.bind(chunk_hashes)
|
||||
.bind(&batch[0].1)
|
||||
.execute(self.maintenance_pool.as_ref())
|
||||
.await
|
||||
.map_err(|e| {
|
||||
DomainError::internal_error("Dedup", format!("GC decrement chunks: {e}"))
|
||||
})?;
|
||||
.map_err(|e| DomainError::internal_error("Dedup", format!("GC chunk refs: {e}")))?;
|
||||
} else {
|
||||
// One reference is owned per DISTINCT chunk hash per manifest,
|
||||
// even if that chunk occurs multiple times in the file. Borrow
|
||||
// hashes while aggregating so shared chunks are cloned only once.
|
||||
let mut decrements = HashMap::<&str, i32>::new();
|
||||
for (_, chunk_hashes, _) in &batch {
|
||||
let distinct: HashSet<&str> = chunk_hashes.iter().map(String::as_str).collect();
|
||||
for hash in distinct {
|
||||
*decrements.entry(hash).or_default() += 1;
|
||||
}
|
||||
}
|
||||
let (hashes, decrement_by): (Vec<String>, Vec<i32>) = decrements
|
||||
.into_iter()
|
||||
.map(|(hash, decrement)| (hash.to_owned(), decrement))
|
||||
.unzip();
|
||||
|
||||
sqlx::query(
|
||||
"UPDATE storage.blobs b
|
||||
SET ref_count = GREATEST(b.ref_count - d.decrement_by, 0),
|
||||
orphaned_at = CASE
|
||||
WHEN GREATEST(b.ref_count - d.decrement_by, 0) = 0
|
||||
THEN now()
|
||||
ELSE b.orphaned_at
|
||||
END
|
||||
FROM unnest($1::text[], $2::integer[]) AS d(hash, decrement_by)
|
||||
WHERE b.hash = d.hash",
|
||||
)
|
||||
.bind(&hashes)
|
||||
.bind(&decrement_by)
|
||||
.execute(self.maintenance_pool.as_ref())
|
||||
.await
|
||||
.map_err(|e| DomainError::internal_error("Dedup", format!("GC chunk refs: {e}")))?;
|
||||
}
|
||||
|
||||
for (file_hash, chunk_hashes, size) in &batch {
|
||||
// Fire the blob hooks against the **manifest's file_hash** —
|
||||
// that's the key thumbnails are stored under (whole-file
|
||||
// BLAKE3, not chunk hashes). Phase 2 below fires hooks for
|
||||
@@ -3167,6 +3449,72 @@ mod tests {
|
||||
};
|
||||
assert_eq!(outcome.distinct_hashes(), vec!["a", "b", "c"]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn integrity_phase_one_deduplicates_probes_but_replays_each_occurrence() {
|
||||
let manifests: Vec<IntegrityManifest> = vec![
|
||||
(
|
||||
"file-a".into(),
|
||||
vec!["shared".into(), "missing-x".into(), "shared".into()],
|
||||
vec![256, 256, 257],
|
||||
1,
|
||||
),
|
||||
("file-b".into(), vec!["shared".into()], vec![999], 999),
|
||||
("bad".into(), vec!["never-query".into()], vec![], 0),
|
||||
];
|
||||
|
||||
let mut sizes = integrity_chunk_sizes(&manifests);
|
||||
assert_eq!(
|
||||
sizes.hashes.len(),
|
||||
2,
|
||||
"shared hash must be probed only once"
|
||||
);
|
||||
assert_eq!(
|
||||
sizes.hashes,
|
||||
vec!["missing-x", "shared"],
|
||||
"borrowed keys must be sorted for binary-search replay"
|
||||
);
|
||||
assert!(
|
||||
sizes.hashes.binary_search(&"never-query").is_err(),
|
||||
"malformed manifests keep the historical no-probe behaviour"
|
||||
);
|
||||
|
||||
let shared = sizes.hashes.binary_search(&"shared").unwrap();
|
||||
sizes.sizes[shared] = Some(256);
|
||||
assert_eq!(
|
||||
integrity_manifest_issues(&manifests, &sizes),
|
||||
vec![
|
||||
"Manifest file-a: total_size 1 != sum of chunk_sizes 769",
|
||||
"Manifest file-a chunk missing-x: missing in backend",
|
||||
"Manifest file-a chunk shared: size mismatch (expected 257, actual 256)",
|
||||
"Manifest file-b chunk shared: size mismatch (expected 999, actual 256)",
|
||||
"Manifest bad: chunk_hashes/chunk_sizes length mismatch",
|
||||
]
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn integrity_phase_one_serial_fast_path_covers_zero_latency_break_even() {
|
||||
let manifest = |name: &str, count: usize| -> IntegrityManifest {
|
||||
(
|
||||
name.into(),
|
||||
(0..count).map(|i| format!("hash-{i}")).collect(),
|
||||
vec![256; count],
|
||||
(count * 256) as i64,
|
||||
)
|
||||
};
|
||||
|
||||
assert!(integrity_uses_serial_fast_path(&[manifest("one", 2)]));
|
||||
assert!(integrity_uses_serial_fast_path(&[
|
||||
manifest("one", 1),
|
||||
manifest("two", 1),
|
||||
]));
|
||||
assert!(integrity_uses_serial_fast_path(&[manifest("one", 4)]));
|
||||
assert!(
|
||||
!integrity_uses_serial_fast_path(&[manifest("one", 5)]),
|
||||
"the measured concurrent path starts above four occurrences"
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
// ─────────────────────────────────────────────────────────────────────────────
|
||||
@@ -3549,6 +3897,14 @@ mod delta_upload_integration_tests {
|
||||
use tempfile::TempDir;
|
||||
use uuid::Uuid;
|
||||
|
||||
// GC sweeps the shared integration database globally, while every test
|
||||
// intentionally owns a different TempDir-backed blob store. Running two
|
||||
// sweep tests concurrently can therefore delete test A's row through test
|
||||
// B's backend, leaving A's physical blob behind. Production has one shared
|
||||
// backend for the swept database; serialize only these global-sweep tests
|
||||
// so the integration topology models that invariant.
|
||||
static GC_TEST_SERIALIZER: tokio::sync::Mutex<()> = tokio::sync::Mutex::const_new(());
|
||||
|
||||
async fn test_pool() -> Arc<PgPool> {
|
||||
let pool = PgPoolOptions::new()
|
||||
.max_connections(4)
|
||||
@@ -3847,6 +4203,7 @@ mod delta_upload_integration_tests {
|
||||
// ── Garbage collection: grace window + reference cross-checks ─
|
||||
#[tokio::test]
|
||||
async fn garbage_collect_honours_grace_window_and_references() {
|
||||
let _gc_test_guard = GC_TEST_SERIALIZER.lock().await;
|
||||
let pool = test_pool().await;
|
||||
let dir = TempDir::new().unwrap();
|
||||
let svc = local_svc(&pool, &dir).await;
|
||||
@@ -3941,9 +4298,113 @@ mod delta_upload_integration_tests {
|
||||
cleanup(&pool, &file_hash, file_id, &[]).await;
|
||||
}
|
||||
|
||||
// ── Batched manifest GC: shared + repeated chunk accounting ───
|
||||
#[tokio::test]
|
||||
async fn garbage_collect_batches_shared_and_repeated_chunk_decrements() {
|
||||
let _gc_test_guard = GC_TEST_SERIALIZER.lock().await;
|
||||
let pool = test_pool().await;
|
||||
let dir = TempDir::new().unwrap();
|
||||
let svc = local_svc(&pool, &dir).await;
|
||||
let (user, drive_id) = seed_user(&pool).await;
|
||||
|
||||
// A live CDC file supplies a chunk shared by two synthetic orphan
|
||||
// manifests. Its file row keeps the live manifest out of phase 1.
|
||||
let data = content(3 * 1024 * 1024, 83);
|
||||
let (live_hash, live_chunks, live_file_id) =
|
||||
seed_owned_content(&svc, &pool, user, drive_id, &data, "gc-batch-live").await;
|
||||
let shared = live_chunks
|
||||
.first()
|
||||
.expect("live content has chunks")
|
||||
.clone();
|
||||
|
||||
let orphan_a = blake3::hash(Uuid::new_v4().as_bytes()).to_hex().to_string();
|
||||
let orphan_b = blake3::hash(Uuid::new_v4().as_bytes()).to_hex().to_string();
|
||||
let unique_a = blake3::hash(Uuid::new_v4().as_bytes()).to_hex().to_string();
|
||||
let unique_b = blake3::hash(Uuid::new_v4().as_bytes()).to_hex().to_string();
|
||||
|
||||
// `shared` owns one reference from the live manifest plus one from
|
||||
// each orphan manifest. Manifest A repeats it twice in its ordered
|
||||
// chunk list, but ingest accounting owns only one DISTINCT reference
|
||||
// per manifest — the batched decrement must therefore be 2, not 3.
|
||||
sqlx::query("UPDATE storage.blobs SET ref_count = ref_count + 2 WHERE hash = $1")
|
||||
.bind(&shared)
|
||||
.execute(pool.as_ref())
|
||||
.await
|
||||
.expect("add orphan refs to shared chunk");
|
||||
sqlx::query(
|
||||
"INSERT INTO storage.blobs (hash, size, ref_count)
|
||||
VALUES ($1, 1, 1), ($2, 1, 1)",
|
||||
)
|
||||
.bind(&unique_a)
|
||||
.bind(&unique_b)
|
||||
.execute(pool.as_ref())
|
||||
.await
|
||||
.expect("seed unique orphan chunks");
|
||||
sqlx::query(
|
||||
"INSERT INTO storage.chunk_manifests
|
||||
(file_hash, chunk_hashes, chunk_sizes, total_size,
|
||||
chunk_count, content_type, ref_count)
|
||||
VALUES
|
||||
($1, $2, $3, 3, 3, 'application/octet-stream', 0),
|
||||
($4, $5, $6, 2, 2, 'application/octet-stream', 0)",
|
||||
)
|
||||
.bind(&orphan_a)
|
||||
.bind(vec![shared.clone(), shared.clone(), unique_a.clone()])
|
||||
.bind(vec![1i64, 1, 1])
|
||||
.bind(&orphan_b)
|
||||
.bind(vec![shared.clone(), unique_b.clone()])
|
||||
.bind(vec![1i64, 1])
|
||||
.execute(pool.as_ref())
|
||||
.await
|
||||
.expect("seed orphan manifests");
|
||||
|
||||
svc.garbage_collect().await.expect("batched GC");
|
||||
|
||||
let remaining_orphans: i64 = sqlx::query_scalar(
|
||||
"SELECT COUNT(*) FROM storage.chunk_manifests
|
||||
WHERE file_hash = ANY($1)",
|
||||
)
|
||||
.bind(vec![orphan_a, orphan_b])
|
||||
.fetch_one(pool.as_ref())
|
||||
.await
|
||||
.expect("orphan manifest count");
|
||||
assert_eq!(remaining_orphans, 0, "both orphan manifests removed");
|
||||
|
||||
let live_manifest_exists: bool = sqlx::query_scalar(
|
||||
"SELECT EXISTS(
|
||||
SELECT 1 FROM storage.chunk_manifests WHERE file_hash = $1
|
||||
)",
|
||||
)
|
||||
.bind(&live_hash)
|
||||
.fetch_one(pool.as_ref())
|
||||
.await
|
||||
.expect("live manifest lookup");
|
||||
assert!(live_manifest_exists, "file-backed live manifest preserved");
|
||||
assert_eq!(
|
||||
blob_ref(&pool, &shared).await,
|
||||
Some(1),
|
||||
"shared chunk decremented once per orphan manifest, not per occurrence"
|
||||
);
|
||||
assert_eq!(blob_ref(&pool, &unique_a).await, Some(0));
|
||||
assert_eq!(blob_ref(&pool, &unique_b).await, Some(0));
|
||||
|
||||
let stamped: i64 = sqlx::query_scalar(
|
||||
"SELECT COUNT(*) FROM storage.blobs
|
||||
WHERE hash = ANY($1) AND orphaned_at IS NOT NULL",
|
||||
)
|
||||
.bind(vec![unique_a.clone(), unique_b.clone()])
|
||||
.fetch_one(pool.as_ref())
|
||||
.await
|
||||
.expect("orphan stamps");
|
||||
assert_eq!(stamped, 2, "newly orphaned chunks start their GC grace");
|
||||
|
||||
cleanup(&pool, &live_hash, live_file_id, &[unique_a, unique_b]).await;
|
||||
}
|
||||
|
||||
// ── Manifest dereference defers chunk reclamation to GC ──────
|
||||
#[tokio::test]
|
||||
async fn manifest_dereference_defers_chunk_reclamation_to_gc() {
|
||||
let _gc_test_guard = GC_TEST_SERIALIZER.lock().await;
|
||||
let pool = test_pool().await;
|
||||
let dir = TempDir::new().unwrap();
|
||||
let svc = local_svc(&pool, &dir).await;
|
||||
|
||||
@@ -87,9 +87,17 @@ async fn fsync_paths_parallel(paths: Vec<PathBuf>, strict: bool) -> Result<(), D
|
||||
return Ok(());
|
||||
}
|
||||
let group_size = paths.len().div_ceil(SYNC_SWEEP_CONCURRENCY);
|
||||
let mut tasks = Vec::with_capacity(SYNC_SWEEP_CONCURRENCY);
|
||||
for group in paths.chunks(group_size) {
|
||||
let group = group.to_vec();
|
||||
let task_count = paths.len().min(SYNC_SWEEP_CONCURRENCY);
|
||||
let mut source = paths.into_iter();
|
||||
let mut tasks = Vec::with_capacity(task_count);
|
||||
loop {
|
||||
// `paths` is owned by this function. Move each PathBuf into its task
|
||||
// group instead of cloning every allocation merely to satisfy the
|
||||
// blocking task's `'static` lifetime.
|
||||
let group: Vec<PathBuf> = source.by_ref().take(group_size).collect();
|
||||
if group.is_empty() {
|
||||
break;
|
||||
}
|
||||
tasks.push(tokio::task::spawn_blocking(
|
||||
move || -> Result<(), (PathBuf, std::io::Error)> {
|
||||
for path in &group {
|
||||
@@ -122,6 +130,25 @@ async fn fsync_paths_parallel(paths: Vec<PathBuf>, strict: bool) -> Result<(), D
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn hex_prefix_symbol(byte: u8) -> Option<usize> {
|
||||
match byte {
|
||||
b'0'..=b'9' => Some((byte - b'0') as usize),
|
||||
b'a'..=b'f' => Some((byte - b'a' + 10) as usize),
|
||||
// Preserve the exact directory spelling. On a case-sensitive
|
||||
// filesystem `af/` and `AF/` are different durability domains; folding
|
||||
// them into one bitmap slot could omit one parent-directory fsync.
|
||||
b'A'..=b'F' => Some((byte - b'A' + 16) as usize),
|
||||
_ => None,
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn hash_prefix_slot(hash: &str) -> Option<usize> {
|
||||
let bytes = hash.as_bytes();
|
||||
Some(hex_prefix_symbol(*bytes.first()?)? * 22 + hex_prefix_symbol(*bytes.get(1)?)?)
|
||||
}
|
||||
|
||||
/// Create `blob_path` and write `data` into it.
|
||||
///
|
||||
/// Returns the open file handle so the caller decides the durability tier
|
||||
@@ -398,22 +425,45 @@ impl BlobStorageBackend for LocalBlobBackend {
|
||||
&self,
|
||||
hashes: &[String],
|
||||
) -> Pin<Box<dyn std::future::Future<Output = Result<(), DomainError>> + Send + '_>> {
|
||||
let paths: Vec<PathBuf> = hashes.iter().map(|h| self.blob_path(h)).collect();
|
||||
Box::pin(async move {
|
||||
if paths.is_empty() {
|
||||
return Ok(());
|
||||
if hashes.is_empty() {
|
||||
return Box::pin(async { Ok(()) });
|
||||
}
|
||||
let mut paths = Vec::with_capacity(hashes.len());
|
||||
let mut dirs = Vec::with_capacity(hashes.len().min(HEX_PREFIXES.len()));
|
||||
if let [hash] = hashes {
|
||||
// Common tiny upload: reuse the already-built path's parent. This
|
||||
// preserves the old one-item cost and avoids zeroing a bitmap whose
|
||||
// O(1) advantage only starts once there is something to deduplicate.
|
||||
let path = self.blob_path(hash);
|
||||
if let Some(parent) = path.parent() {
|
||||
dirs.push(parent.to_owned());
|
||||
}
|
||||
|
||||
paths.push(path);
|
||||
} else {
|
||||
// 10 digits + 6 lowercase + 6 uppercase symbols per position. The
|
||||
// 484-byte bitmap is still stack-only/O(1), while preserving exact
|
||||
// parent paths on case-sensitive filesystems.
|
||||
let mut seen_prefix = [false; 22 * 22];
|
||||
for hash in hashes {
|
||||
paths.push(self.blob_path(hash));
|
||||
if let Some(slot) = hash_prefix_slot(hash) {
|
||||
if !seen_prefix[slot] {
|
||||
seen_prefix[slot] = true;
|
||||
dirs.push(self.blob_root.join(&hash[..2]));
|
||||
}
|
||||
} else {
|
||||
// `blob_path` already requires an ASCII two-byte prefix, and
|
||||
// content hashes are canonical hex. Retain the old behaviour
|
||||
// for a non-hex caller without panicking here: syncing a
|
||||
// duplicate invalid parent is safer than silently omitting it.
|
||||
dirs.push(self.blob_root.join(&hash[..2]));
|
||||
}
|
||||
}
|
||||
}
|
||||
Box::pin(async move {
|
||||
// Each distinct prefix directory is fsync'd exactly once —
|
||||
// chunks of one upload land in at most 256 prefix dirs, so
|
||||
// this replaces one dir fsync *per chunk* with ≤256 total.
|
||||
let mut dirs: Vec<PathBuf> = paths
|
||||
.iter()
|
||||
.filter_map(|p| p.parent().map(Path::to_path_buf))
|
||||
.collect();
|
||||
dirs.sort_unstable();
|
||||
dirs.dedup();
|
||||
|
||||
// Files first (hard requirement), then dirents (best-effort,
|
||||
// same tier as fsync_parent_dir).
|
||||
fsync_paths_parallel(paths, true).await?;
|
||||
@@ -647,4 +697,21 @@ mod tests {
|
||||
|
||||
backend.sync_blobs(&[]).await.unwrap();
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn prefix_slots_cover_lowercase_hex_space_and_preserve_case() {
|
||||
let mut seen = [false; 22 * 22];
|
||||
for prefix in HEX_PREFIXES {
|
||||
let hash = format!("{prefix}{}", "0".repeat(62));
|
||||
let slot = hash_prefix_slot(&hash).unwrap();
|
||||
assert!(!seen[slot]);
|
||||
seen[slot] = true;
|
||||
}
|
||||
assert_eq!(seen.into_iter().filter(|value| *value).count(), 256);
|
||||
assert_ne!(
|
||||
hash_prefix_slot(&fake_hash("af")),
|
||||
hash_prefix_slot(&fake_hash("aF"))
|
||||
);
|
||||
assert_eq!(hash_prefix_slot("gg"), None);
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user