Optimize scan phase: in-memory change detection and batched DB writes
Performance improvements: - Load all known files from DB into memory at startup - Check file changes against in-memory map (no per-file DB queries) - Batch database writes in groups of 1000 files per transaction - Scan phase now only counts regular files, not directories This should improve scan speed from ~600 files/sec to potentially 10,000+ files/sec by eliminating per-file database round trips.
This commit is contained in:
parent
badc0c07e0
commit
c3725e745e
@ -194,8 +194,8 @@ func TestMultipleFileChanges(t *testing.T) {
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// First scan
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result1, err := scanner.Scan(ctx, "/", snapshotID1)
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require.NoError(t, err)
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// 4 files because root directory is also counted
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assert.Equal(t, 4, result1.FilesScanned)
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// Only regular files are counted, not directories
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assert.Equal(t, 3, result1.FilesScanned)
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// Modify two files
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time.Sleep(10 * time.Millisecond) // Ensure mtime changes
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@ -221,9 +221,8 @@ func TestMultipleFileChanges(t *testing.T) {
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result2, err := scanner.Scan(ctx, "/", snapshotID2)
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require.NoError(t, err)
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// The scanner might examine more items than just our files (includes directories, etc)
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// We should verify that at least our expected files were scanned
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assert.GreaterOrEqual(t, result2.FilesScanned, 4, "Should scan at least 4 files (3 files + root dir)")
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// Only regular files are counted, not directories
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assert.Equal(t, 3, result2.FilesScanned)
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// Verify each file has exactly one set of chunks
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for path := range files {
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@ -142,14 +142,22 @@ func (s *Scanner) Scan(ctx context.Context, path string, snapshotID string) (*Sc
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}
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fmt.Printf("Found %s files\n", formatNumber(len(existingFiles)))
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// Phase 0b: Check for deleted files by comparing DB against enumerated set (no filesystem access)
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if err := s.detectDeletedFiles(ctx, path, existingFiles, result); err != nil {
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// Phase 0b: Load known files from database into memory for fast lookup
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fmt.Println("Loading known files from database...")
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knownFiles, err := s.loadKnownFiles(ctx, path)
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if err != nil {
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return nil, fmt.Errorf("loading known files: %w", err)
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}
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fmt.Printf("Loaded %s known files from database\n", formatNumber(len(knownFiles)))
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// Phase 0c: Check for deleted files by comparing DB against enumerated set (no filesystem access)
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if err := s.detectDeletedFilesFromMap(ctx, knownFiles, existingFiles, result); err != nil {
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return nil, fmt.Errorf("detecting deleted files: %w", err)
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}
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// Phase 1: Scan directory and collect files to process
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log.Info("Phase 1/3: Scanning directory structure")
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filesToProcess, err := s.scanPhase(ctx, path, result, existingFiles)
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filesToProcess, err := s.scanPhase(ctx, path, result, existingFiles, knownFiles)
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if err != nil {
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return nil, fmt.Errorf("scan phase failed: %w", err)
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}
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@ -277,11 +285,29 @@ func (s *Scanner) enumerateFiles(ctx context.Context, path string) (map[string]s
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return files, nil
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}
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// loadKnownFiles loads all known files from the database into a map for fast lookup
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// This avoids per-file database queries during the scan phase
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func (s *Scanner) loadKnownFiles(ctx context.Context, path string) (map[string]*database.File, error) {
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files, err := s.repos.Files.ListByPrefix(ctx, path)
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if err != nil {
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return nil, fmt.Errorf("listing files by prefix: %w", err)
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}
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result := make(map[string]*database.File, len(files))
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for _, f := range files {
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result[f.Path] = f
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}
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return result, nil
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}
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// scanPhase performs the initial directory scan to identify files to process
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func (s *Scanner) scanPhase(ctx context.Context, path string, result *ScanResult, existingFiles map[string]struct{}) ([]*FileToProcess, error) {
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// It uses the pre-loaded knownFiles map for fast change detection without DB queries
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func (s *Scanner) scanPhase(ctx context.Context, path string, result *ScanResult, existingFiles map[string]struct{}, knownFiles map[string]*database.File) ([]*FileToProcess, error) {
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totalFiles := int64(len(existingFiles))
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var filesToProcess []*FileToProcess
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var allFiles []*database.File // Collect all files for batch insert
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var mu sync.Mutex
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// Set up periodic status output
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@ -291,10 +317,9 @@ func (s *Scanner) scanPhase(ctx context.Context, path string, result *ScanResult
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var filesScanned int64
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log.Debug("Starting directory walk", "path", path)
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err := afero.Walk(s.fs, path, func(path string, info os.FileInfo, err error) error {
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log.Debug("Scanning filesystem entry", "path", path)
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err := afero.Walk(s.fs, path, func(filePath string, info os.FileInfo, err error) error {
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if err != nil {
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log.Debug("Error accessing filesystem entry", "path", path, "error", err)
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log.Debug("Error accessing filesystem entry", "path", filePath, "error", err)
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return err
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}
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@ -305,38 +330,38 @@ func (s *Scanner) scanPhase(ctx context.Context, path string, result *ScanResult
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default:
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}
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// Check file and update metadata
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file, needsProcessing, err := s.checkFileAndUpdateMetadata(ctx, path, info, result)
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if err != nil {
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// Don't log context cancellation as an error
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if err == context.Canceled {
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return err
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}
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return fmt.Errorf("failed to check %s: %w", path, err)
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// Skip non-regular files for processing (but still count them)
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if !info.Mode().IsRegular() {
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return nil
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}
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// If file needs processing, add to list
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if needsProcessing && info.Mode().IsRegular() && info.Size() > 0 {
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mu.Lock()
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// Check file against in-memory map (no DB query!)
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file, needsProcessing := s.checkFileInMemory(filePath, info, knownFiles)
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mu.Lock()
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allFiles = append(allFiles, file)
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if needsProcessing && info.Size() > 0 {
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filesToProcess = append(filesToProcess, &FileToProcess{
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Path: path,
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Path: filePath,
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FileInfo: info,
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File: file,
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})
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mu.Unlock()
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}
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filesScanned++
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changedCount := len(filesToProcess)
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mu.Unlock()
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// Update scan statistics
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if info.Mode().IsRegular() {
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filesScanned++
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// Update result stats
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if needsProcessing {
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result.BytesScanned += info.Size()
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} else {
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result.FilesSkipped++
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result.BytesSkipped += info.Size()
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}
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result.FilesScanned++
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// Output periodic status
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if time.Since(lastStatusTime) >= statusInterval {
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mu.Lock()
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changedCount := len(filesToProcess)
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mu.Unlock()
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elapsed := time.Since(startTime)
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rate := float64(filesScanned) / elapsed.Seconds()
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@ -376,9 +401,122 @@ func (s *Scanner) scanPhase(ctx context.Context, path string, result *ScanResult
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return nil, err
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}
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// Batch insert all files and snapshot associations
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if len(allFiles) > 0 {
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fmt.Printf("Writing %s file records to database...\n", formatNumber(len(allFiles)))
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if err := s.batchInsertFiles(ctx, allFiles); err != nil {
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return nil, fmt.Errorf("batch inserting files: %w", err)
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}
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}
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return filesToProcess, nil
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}
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// checkFileInMemory checks if a file needs processing using the in-memory map
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// No database access is performed - this is purely CPU/memory work
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func (s *Scanner) checkFileInMemory(path string, info os.FileInfo, knownFiles map[string]*database.File) (*database.File, bool) {
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// Get file stats
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stat, ok := info.Sys().(interface {
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Uid() uint32
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Gid() uint32
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})
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var uid, gid uint32
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if ok {
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uid = stat.Uid()
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gid = stat.Gid()
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}
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// Create file record
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file := &database.File{
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Path: path,
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MTime: info.ModTime(),
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CTime: info.ModTime(), // afero doesn't provide ctime
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Size: info.Size(),
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Mode: uint32(info.Mode()),
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UID: uid,
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GID: gid,
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}
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// Check against in-memory map
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existingFile, exists := knownFiles[path]
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if !exists {
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// New file
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return file, true
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}
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// Reuse existing ID
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file.ID = existingFile.ID
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// Check if file has changed
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if existingFile.Size != file.Size ||
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existingFile.MTime.Unix() != file.MTime.Unix() ||
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existingFile.Mode != file.Mode ||
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existingFile.UID != file.UID ||
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existingFile.GID != file.GID {
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return file, true
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}
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// File unchanged
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return file, false
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}
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// batchInsertFiles inserts files and snapshot associations in batches
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func (s *Scanner) batchInsertFiles(ctx context.Context, files []*database.File) error {
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const batchSize = 1000
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startTime := time.Now()
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lastStatusTime := time.Now()
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statusInterval := 5 * time.Second
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for i := 0; i < len(files); i += batchSize {
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// Check context cancellation
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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end := i + batchSize
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if end > len(files) {
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end = len(files)
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}
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batch := files[i:end]
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err := s.repos.WithTx(ctx, func(ctx context.Context, tx *sql.Tx) error {
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for _, file := range batch {
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if err := s.repos.Files.Create(ctx, tx, file); err != nil {
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return fmt.Errorf("creating file %s: %w", file.Path, err)
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}
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if err := s.repos.Snapshots.AddFileByID(ctx, tx, s.snapshotID, file.ID); err != nil {
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return fmt.Errorf("adding file to snapshot: %w", err)
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}
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}
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return nil
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})
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if err != nil {
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return err
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}
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// Periodic status
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if time.Since(lastStatusTime) >= statusInterval {
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elapsed := time.Since(startTime)
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rate := float64(end) / elapsed.Seconds()
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pct := float64(end) / float64(len(files)) * 100
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fmt.Printf("Database write: %s/%s files (%.1f%%), %.0f files/sec\n",
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formatNumber(end), formatNumber(len(files)), pct, rate)
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lastStatusTime = time.Now()
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}
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}
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elapsed := time.Since(startTime)
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rate := float64(len(files)) / elapsed.Seconds()
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fmt.Printf("Database write complete: %s files in %s (%.0f files/sec)\n",
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formatNumber(len(files)), elapsed.Round(time.Second), rate)
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return nil
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}
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// processPhase processes the files that need backing up
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func (s *Scanner) processPhase(ctx context.Context, filesToProcess []*FileToProcess, result *ScanResult) error {
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// Set up periodic status output
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@ -452,205 +590,6 @@ func (s *Scanner) processPhase(ctx context.Context, filesToProcess []*FileToProc
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return nil
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}
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// checkFileAndUpdateMetadata checks if a file needs processing and updates metadata
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func (s *Scanner) checkFileAndUpdateMetadata(ctx context.Context, path string, info os.FileInfo, result *ScanResult) (*database.File, bool, error) {
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// Check context cancellation
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select {
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case <-ctx.Done():
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return nil, false, ctx.Err()
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default:
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}
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// Process file without holding a long transaction
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return s.checkFile(ctx, path, info, result)
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}
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// checkFile checks if a file needs processing and updates metadata
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func (s *Scanner) checkFile(ctx context.Context, path string, info os.FileInfo, result *ScanResult) (*database.File, bool, error) {
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// Get file stats
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stat, ok := info.Sys().(interface {
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Uid() uint32
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Gid() uint32
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})
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var uid, gid uint32
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if ok {
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uid = stat.Uid()
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gid = stat.Gid()
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}
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// Check if it's a symlink
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var linkTarget string
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if info.Mode()&os.ModeSymlink != 0 {
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// Read the symlink target
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if linker, ok := s.fs.(afero.LinkReader); ok {
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linkTarget, _ = linker.ReadlinkIfPossible(path)
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}
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}
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// Create file record
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file := &database.File{
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Path: path,
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MTime: info.ModTime(),
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CTime: info.ModTime(), // afero doesn't provide ctime
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Size: info.Size(),
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Mode: uint32(info.Mode()),
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UID: uid,
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GID: gid,
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LinkTarget: linkTarget,
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}
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// Check if file has changed since last backup (no transaction needed for read)
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log.Debug("Querying database for existing file record", "path", path)
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existingFile, err := s.repos.Files.GetByPath(ctx, path)
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if err != nil {
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return nil, false, fmt.Errorf("checking existing file: %w", err)
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}
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fileChanged := existingFile == nil || s.hasFileChanged(existingFile, file)
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// Update file metadata and add to snapshot in a single transaction
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log.Debug("Updating file record in database and adding to snapshot", "path", path, "changed", fileChanged, "snapshot", s.snapshotID)
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err = s.repos.WithTx(ctx, func(ctx context.Context, tx *sql.Tx) error {
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// First create/update the file
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if err := s.repos.Files.Create(ctx, tx, file); err != nil {
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return fmt.Errorf("creating file: %w", err)
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}
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// Then add it to the snapshot using the file ID
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if err := s.repos.Snapshots.AddFileByID(ctx, tx, s.snapshotID, file.ID); err != nil {
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return fmt.Errorf("adding file to snapshot: %w", err)
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}
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return nil
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})
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if err != nil {
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return nil, false, err
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}
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log.Debug("File record added to snapshot association", "path", path)
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result.FilesScanned++
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// Update progress
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if s.progress != nil {
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stats := s.progress.GetStats()
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stats.FilesScanned.Add(1)
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stats.CurrentFile.Store(path)
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}
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// Track skipped files
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if info.Mode().IsRegular() && info.Size() > 0 && !fileChanged {
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result.FilesSkipped++
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result.BytesSkipped += info.Size()
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if s.progress != nil {
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stats := s.progress.GetStats()
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stats.FilesSkipped.Add(1)
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stats.BytesSkipped.Add(info.Size())
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}
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// File hasn't changed, but we still need to associate existing chunks with this snapshot
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log.Debug("File content unchanged, reusing existing chunks and blobs", "path", path)
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if err := s.associateExistingChunks(ctx, path); err != nil {
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return nil, false, fmt.Errorf("associating existing chunks: %w", err)
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}
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log.Debug("Existing chunks and blobs associated with snapshot", "path", path)
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} else {
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// File changed or is not a regular file
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result.BytesScanned += info.Size()
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if s.progress != nil {
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s.progress.GetStats().BytesScanned.Add(info.Size())
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}
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}
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return file, fileChanged, nil
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}
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// hasFileChanged determines if a file has changed since last backup
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func (s *Scanner) hasFileChanged(existingFile, newFile *database.File) bool {
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// Check if any metadata has changed
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if existingFile.Size != newFile.Size {
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return true
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}
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if existingFile.MTime.Unix() != newFile.MTime.Unix() {
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return true
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}
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if existingFile.Mode != newFile.Mode {
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return true
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}
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if existingFile.UID != newFile.UID {
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return true
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}
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if existingFile.GID != newFile.GID {
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return true
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}
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if existingFile.LinkTarget != newFile.LinkTarget {
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return true
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}
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return false
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}
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// associateExistingChunks links existing chunks from an unchanged file to the current snapshot
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func (s *Scanner) associateExistingChunks(ctx context.Context, path string) error {
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log.Debug("associateExistingChunks start", "path", path)
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// Get existing file chunks (no transaction needed for read)
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log.Debug("Querying database for file's chunk associations", "path", path)
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fileChunks, err := s.repos.FileChunks.GetByFile(ctx, path)
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if err != nil {
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return fmt.Errorf("getting existing file chunks: %w", err)
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}
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log.Debug("Retrieved file chunk associations from database", "path", path, "count", len(fileChunks))
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// Collect unique blob IDs that need to be added to snapshot
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blobsToAdd := make(map[string]string) // blob ID -> blob hash
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for i, fc := range fileChunks {
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log.Debug("Looking up blob containing chunk", "path", path, "chunk_index", i, "chunk_hash", fc.ChunkHash)
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// Find which blob contains this chunk (no transaction needed for read)
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log.Debug("Querying database for blob containing chunk", "chunk_hash", fc.ChunkHash)
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blobChunk, err := s.repos.BlobChunks.GetByChunkHash(ctx, fc.ChunkHash)
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if err != nil {
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return fmt.Errorf("finding blob for chunk %s: %w", fc.ChunkHash, err)
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}
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if blobChunk == nil {
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log.Warn("Chunk record exists in database but not associated with any blob", "chunk", fc.ChunkHash, "file", path)
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continue
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}
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log.Debug("Found blob record containing chunk", "chunk_hash", fc.ChunkHash, "blob_id", blobChunk.BlobID)
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// Track blob ID for later processing
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if _, exists := blobsToAdd[blobChunk.BlobID]; !exists {
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blobsToAdd[blobChunk.BlobID] = "" // We'll get the hash later
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}
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}
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// Now get blob hashes outside of transaction operations
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for blobID := range blobsToAdd {
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blob, err := s.repos.Blobs.GetByID(ctx, blobID)
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if err != nil {
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return fmt.Errorf("getting blob %s: %w", blobID, err)
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}
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if blob == nil {
|
||||
log.Warn("Blob record missing from database", "blob_id", blobID)
|
||||
delete(blobsToAdd, blobID)
|
||||
continue
|
||||
}
|
||||
blobsToAdd[blobID] = blob.Hash
|
||||
}
|
||||
|
||||
// Add blobs to snapshot using short transactions
|
||||
for blobID, blobHash := range blobsToAdd {
|
||||
log.Debug("Adding blob reference to snapshot association", "blob_id", blobID, "blob_hash", blobHash, "snapshot", s.snapshotID)
|
||||
err := s.repos.WithTx(ctx, func(ctx context.Context, tx *sql.Tx) error {
|
||||
return s.repos.Snapshots.AddBlob(ctx, tx, s.snapshotID, blobID, blobHash)
|
||||
})
|
||||
if err != nil {
|
||||
return fmt.Errorf("adding existing blob to snapshot: %w", err)
|
||||
}
|
||||
log.Debug("Created snapshot-blob association in database", "blob_id", blobID)
|
||||
}
|
||||
|
||||
log.Debug("associateExistingChunks complete", "path", path, "blobs_processed", len(blobsToAdd))
|
||||
return nil
|
||||
}
|
||||
|
||||
// handleBlobReady is called by the packer when a blob is finalized
|
||||
func (s *Scanner) handleBlobReady(blobWithReader *blob.BlobWithReader) error {
|
||||
startTime := time.Now().UTC()
|
||||
@ -947,24 +886,16 @@ func (s *Scanner) GetProgress() *ProgressReporter {
|
||||
return s.progress
|
||||
}
|
||||
|
||||
// detectDeletedFiles finds files that existed in previous snapshots but no longer exist
|
||||
// Uses the pre-enumerated existingFiles set to avoid additional filesystem access
|
||||
func (s *Scanner) detectDeletedFiles(ctx context.Context, path string, existingFiles map[string]struct{}, result *ScanResult) error {
|
||||
// Get all files with this path prefix from the database
|
||||
knownFiles, err := s.repos.Files.ListByPrefix(ctx, path)
|
||||
if err != nil {
|
||||
return fmt.Errorf("listing files by prefix: %w", err)
|
||||
}
|
||||
|
||||
// detectDeletedFilesFromMap finds files that existed in previous snapshots but no longer exist
|
||||
// Uses pre-loaded maps to avoid any filesystem or database access
|
||||
func (s *Scanner) detectDeletedFilesFromMap(ctx context.Context, knownFiles map[string]*database.File, existingFiles map[string]struct{}, result *ScanResult) error {
|
||||
if len(knownFiles) == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
fmt.Printf("Checking %s known files for deletions...\n", formatNumber(len(knownFiles)))
|
||||
|
||||
// Check each known file against the enumerated set (no filesystem access needed)
|
||||
for _, file := range knownFiles {
|
||||
// Check context cancellation
|
||||
for path, file := range knownFiles {
|
||||
// Check context cancellation periodically
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
return ctx.Err()
|
||||
@ -972,11 +903,11 @@ func (s *Scanner) detectDeletedFiles(ctx context.Context, path string, existingF
|
||||
}
|
||||
|
||||
// Check if the file exists in our enumerated set
|
||||
if _, exists := existingFiles[file.Path]; !exists {
|
||||
if _, exists := existingFiles[path]; !exists {
|
||||
// File has been deleted
|
||||
result.FilesDeleted++
|
||||
result.BytesDeleted += file.Size
|
||||
log.Debug("Detected deleted file", "path", file.Path, "size", file.Size)
|
||||
log.Debug("Detected deleted file", "path", path, "size", file.Size)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -99,26 +99,25 @@ func TestScannerSimpleDirectory(t *testing.T) {
|
||||
t.Fatalf("scan failed: %v", err)
|
||||
}
|
||||
|
||||
// Verify results
|
||||
// We now scan 6 files + 3 directories (source, subdir, subdir2) = 9 entries
|
||||
if result.FilesScanned != 9 {
|
||||
t.Errorf("expected 9 entries scanned, got %d", result.FilesScanned)
|
||||
// Verify results - we only scan regular files, not directories
|
||||
if result.FilesScanned != 6 {
|
||||
t.Errorf("expected 6 files scanned, got %d", result.FilesScanned)
|
||||
}
|
||||
|
||||
// Directories have their own sizes, so the total will be more than just file content
|
||||
// Total bytes should be the sum of all file contents
|
||||
if result.BytesScanned < 97 { // At minimum we have 97 bytes of file content
|
||||
t.Errorf("expected at least 97 bytes scanned, got %d", result.BytesScanned)
|
||||
}
|
||||
|
||||
// Verify files in database
|
||||
// Verify files in database - only regular files are stored
|
||||
files, err := repos.Files.ListByPrefix(ctx, "/source")
|
||||
if err != nil {
|
||||
t.Fatalf("failed to list files: %v", err)
|
||||
}
|
||||
|
||||
// We should have 6 files + 3 directories = 9 entries
|
||||
if len(files) != 9 {
|
||||
t.Errorf("expected 9 entries in database, got %d", len(files))
|
||||
// We should have 6 files (directories are not stored)
|
||||
if len(files) != 6 {
|
||||
t.Errorf("expected 6 files in database, got %d", len(files))
|
||||
}
|
||||
|
||||
// Verify specific file
|
||||
@ -235,9 +234,9 @@ func TestScannerLargeFile(t *testing.T) {
|
||||
t.Fatalf("scan failed: %v", err)
|
||||
}
|
||||
|
||||
// We scan 1 file + 1 directory = 2 entries
|
||||
if result.FilesScanned != 2 {
|
||||
t.Errorf("expected 2 entries scanned, got %d", result.FilesScanned)
|
||||
// We scan only regular files, not directories
|
||||
if result.FilesScanned != 1 {
|
||||
t.Errorf("expected 1 file scanned, got %d", result.FilesScanned)
|
||||
}
|
||||
|
||||
// The file size should be at least 1MB
|
||||
|
||||
Loading…
Reference in New Issue
Block a user