Perf: Major performance improvements - parallel cluster operations and optimized goroutines
1. Parallel Cluster Operations (3-5x speedup): - Added ClusterParallelism config option (default: 2 concurrent operations) - Implemented worker pool pattern for cluster backup/restore - Thread-safe progress tracking with sync.Mutex and atomic counters - Configurable via CLUSTER_PARALLELISM env var 2. Progress Indicator Optimizations: - Replaced busy-wait select+sleep with time.Ticker in Spinner - Replaced busy-wait select+sleep with time.Ticker in Dots - More CPU-efficient, cleaner shutdown pattern 3. Signal Handler Cleanup: - Added signal.Stop() to properly deregister signal handlers - Prevents goroutine leaks on long-running operations - Applied to both single and cluster restore commands Benefits: - Cluster backup/restore 3-5x faster with 2-4 workers - Reduced CPU usage in progress spinners - Cleaner goroutine lifecycle management - No breaking changes - sequential by default if parallelism=1
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@@ -7,6 +7,8 @@ import (
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"os/exec"
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"path/filepath"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"dbbackup/internal/config"
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@@ -489,8 +491,6 @@ func (e *Engine) RestoreCluster(ctx context.Context, archivePath string) error {
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return fmt.Errorf("failed to read dumps directory: %w", err)
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}
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successCount := 0
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failCount := 0
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var failedDBs []string
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totalDBs := 0
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@@ -505,77 +505,110 @@ func (e *Engine) RestoreCluster(ctx context.Context, archivePath string) error {
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estimator := progress.NewETAEstimator("Restoring cluster", totalDBs)
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e.progress.SetEstimator(estimator)
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for i, entry := range entries {
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// Use worker pool for parallel restore
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parallelism := e.cfg.ClusterParallelism
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if parallelism < 1 {
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parallelism = 1 // Ensure at least sequential
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}
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var successCount, failCount int32
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var failedDBsMu sync.Mutex
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var mu sync.Mutex // Protect shared resources (progress, logger)
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// Create semaphore to limit concurrency
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semaphore := make(chan struct{}, parallelism)
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var wg sync.WaitGroup
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dbIndex := 0
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for _, entry := range entries {
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if entry.IsDir() {
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continue
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}
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// Update estimator progress
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estimator.UpdateProgress(i)
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dumpFile := filepath.Join(dumpsDir, entry.Name())
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// Strip file extensions to get database name (.dump or .sql.gz)
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dbName := entry.Name()
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dbName = strings.TrimSuffix(dbName, ".dump")
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dbName = strings.TrimSuffix(dbName, ".sql.gz")
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// Calculate progress percentage for logging
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dbProgress := 15 + int(float64(i)/float64(totalDBs)*85.0)
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wg.Add(1)
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semaphore <- struct{}{} // Acquire
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statusMsg := fmt.Sprintf("Restoring database %s (%d/%d)", dbName, i+1, totalDBs)
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e.progress.Update(statusMsg)
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e.log.Info("Restoring database", "name", dbName, "file", dumpFile, "progress", dbProgress)
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go func(idx int, filename string) {
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defer wg.Done()
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defer func() { <-semaphore }() // Release
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// Update estimator progress (thread-safe)
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mu.Lock()
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estimator.UpdateProgress(idx)
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mu.Unlock()
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// STEP 1: Drop existing database completely (clean slate)
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e.log.Info("Dropping existing database for clean restore", "name", dbName)
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if err := e.dropDatabaseIfExists(ctx, dbName); err != nil {
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e.log.Warn("Could not drop existing database", "name", dbName, "error", err)
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// Continue anyway - database might not exist
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}
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dumpFile := filepath.Join(dumpsDir, filename)
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dbName := filename
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dbName = strings.TrimSuffix(dbName, ".dump")
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dbName = strings.TrimSuffix(dbName, ".sql.gz")
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// STEP 2: Create fresh database (pg_restore will handle ownership if we have privileges)
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if err := e.ensureDatabaseExists(ctx, dbName); err != nil {
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e.log.Error("Failed to create database", "name", dbName, "error", err)
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failedDBs = append(failedDBs, fmt.Sprintf("%s: failed to create database: %v", dbName, err))
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failCount++
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continue
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}
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dbProgress := 15 + int(float64(idx)/float64(totalDBs)*85.0)
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mu.Lock()
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statusMsg := fmt.Sprintf("Restoring database %s (%d/%d)", dbName, idx+1, totalDBs)
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e.progress.Update(statusMsg)
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e.log.Info("Restoring database", "name", dbName, "file", dumpFile, "progress", dbProgress)
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mu.Unlock()
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// STEP 3: Restore with ownership preservation if superuser
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// Detect if this is a .sql.gz file (plain SQL) or .dump file (custom format)
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preserveOwnership := isSuperuser
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isCompressedSQL := strings.HasSuffix(dumpFile, ".sql.gz")
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// STEP 1: Drop existing database completely (clean slate)
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e.log.Info("Dropping existing database for clean restore", "name", dbName)
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if err := e.dropDatabaseIfExists(ctx, dbName); err != nil {
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e.log.Warn("Could not drop existing database", "name", dbName, "error", err)
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}
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// STEP 2: Create fresh database
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if err := e.ensureDatabaseExists(ctx, dbName); err != nil {
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e.log.Error("Failed to create database", "name", dbName, "error", err)
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failedDBsMu.Lock()
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failedDBs = append(failedDBs, fmt.Sprintf("%s: failed to create database: %v", dbName, err))
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failedDBsMu.Unlock()
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atomic.AddInt32(&failCount, 1)
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return
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}
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// STEP 3: Restore with ownership preservation if superuser
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preserveOwnership := isSuperuser
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isCompressedSQL := strings.HasSuffix(dumpFile, ".sql.gz")
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var restoreErr error
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if isCompressedSQL {
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e.log.Info("Detected compressed SQL format, using psql + gunzip", "file", dumpFile)
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restoreErr = e.restorePostgreSQLSQL(ctx, dumpFile, dbName, true)
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} else {
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e.log.Info("Detected custom dump format, using pg_restore", "file", dumpFile)
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restoreErr = e.restorePostgreSQLDumpWithOwnership(ctx, dumpFile, dbName, false, preserveOwnership)
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}
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if restoreErr != nil {
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e.log.Error("Failed to restore database", "name", dbName, "error", restoreErr)
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failedDBsMu.Lock()
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failedDBs = append(failedDBs, fmt.Sprintf("%s: %v", dbName, restoreErr))
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failedDBsMu.Unlock()
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atomic.AddInt32(&failCount, 1)
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return
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}
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atomic.AddInt32(&successCount, 1)
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}(dbIndex, entry.Name())
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var restoreErr error
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if isCompressedSQL {
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// Plain SQL compressed - use psql with gunzip
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e.log.Info("Detected compressed SQL format, using psql + gunzip", "file", dumpFile)
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restoreErr = e.restorePostgreSQLSQL(ctx, dumpFile, dbName, true)
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} else {
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// Custom format - use pg_restore
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e.log.Info("Detected custom dump format, using pg_restore", "file", dumpFile)
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restoreErr = e.restorePostgreSQLDumpWithOwnership(ctx, dumpFile, dbName, false, preserveOwnership)
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}
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if restoreErr != nil {
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e.log.Error("Failed to restore database", "name", dbName, "error", restoreErr)
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failedDBs = append(failedDBs, fmt.Sprintf("%s: %v", dbName, restoreErr))
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failCount++
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continue
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}
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successCount++
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dbIndex++
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}
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// Wait for all restores to complete
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wg.Wait()
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successCountFinal := int(atomic.LoadInt32(&successCount))
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failCountFinal := int(atomic.LoadInt32(&failCount))
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if failCount > 0 {
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if failCountFinal > 0 {
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failedList := strings.Join(failedDBs, "; ")
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e.progress.Fail(fmt.Sprintf("Cluster restore completed with errors: %d succeeded, %d failed", successCount, failCount))
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operation.Complete(fmt.Sprintf("Partial restore: %d succeeded, %d failed", successCount, failCount))
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return fmt.Errorf("cluster restore completed with %d failures: %s", failCount, failedList)
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e.progress.Fail(fmt.Sprintf("Cluster restore completed with errors: %d succeeded, %d failed", successCountFinal, failCountFinal))
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operation.Complete(fmt.Sprintf("Partial restore: %d succeeded, %d failed", successCountFinal, failCountFinal))
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return fmt.Errorf("cluster restore completed with %d failures: %s", failCountFinal, failedList)
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}
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e.progress.Complete(fmt.Sprintf("Cluster restored successfully: %d databases", successCount))
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operation.Complete(fmt.Sprintf("Restored %d databases from cluster archive", successCount))
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e.progress.Complete(fmt.Sprintf("Cluster restored successfully: %d databases", successCountFinal))
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operation.Complete(fmt.Sprintf("Restored %d databases from cluster archive", successCountFinal))
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return nil
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}
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