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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@@ -12,6 +12,8 @@ import (
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"path/filepath"
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"strconv"
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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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@@ -338,90 +340,115 @@ func (e *Engine) BackupCluster(ctx context.Context) error {
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quietProgress.SetEstimator(estimator)
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// Backup each database
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e.printf(" Backing up %d databases...\n", len(databases))
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successCount := 0
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failCount := 0
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for i, dbName := range databases {
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// Update estimator progress
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estimator.UpdateProgress(i)
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e.printf(" [%d/%d] Backing up database: %s\n", i+1, len(databases), dbName)
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quietProgress.Update(fmt.Sprintf("Backing up database %d/%d: %s", i+1, len(databases), dbName))
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// Check database size and warn if very large
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if size, err := e.db.GetDatabaseSize(ctx, dbName); err == nil {
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sizeStr := formatBytes(size)
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e.printf(" Database size: %s\n", sizeStr)
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if size > 10*1024*1024*1024 { // > 10GB
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e.printf(" ⚠️ Large database detected - this may take a while\n")
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}
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}
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dumpFile := filepath.Join(tempDir, "dumps", dbName+".dump")
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// For cluster backups, use settings optimized for large databases:
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// - Lower compression (faster, less memory)
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// - Use parallel dumps if configured
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// - Smart format selection based on size
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compressionLevel := e.cfg.CompressionLevel
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if compressionLevel > 6 {
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compressionLevel = 6 // Cap at 6 for cluster backups to reduce memory
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}
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// Determine optimal format based on database size
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format := "custom"
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parallel := e.cfg.DumpJobs
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// For large databases (>5GB), use plain format with external compression
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// This avoids pg_dump's custom format memory overhead
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if size, err := e.db.GetDatabaseSize(ctx, dbName); err == nil {
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if size > 5*1024*1024*1024 { // > 5GB
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format = "plain" // Plain SQL format
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compressionLevel = 0 // Disable pg_dump compression
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parallel = 0 // Plain format doesn't support parallel
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e.printf(" Using plain format + external compression (optimal for large DBs)\n")
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}
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}
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options := database.BackupOptions{
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Compression: compressionLevel,
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Parallel: parallel,
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Format: format,
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Blobs: true,
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NoOwner: false,
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NoPrivileges: false,
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}
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cmd := e.db.BuildBackupCommand(dbName, dumpFile, options)
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// Use a context with timeout for each database to prevent hangs
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// Use longer timeout for huge databases (2 hours per database)
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dbCtx, cancel := context.WithTimeout(ctx, 2*time.Hour)
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defer cancel() // Ensure cancel is called even if executeCommand panics
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err := e.executeCommand(dbCtx, cmd, dumpFile)
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cancel() // Also call immediately for early cleanup
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if err != nil {
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e.log.Warn("Failed to backup database", "database", dbName, "error", err)
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e.printf(" ⚠️ WARNING: Failed to backup %s: %v\n", dbName, err)
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failCount++
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// Continue with other databases
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} else {
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// If streaming compression was used the compressed file may have a different name
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// (e.g. .sql.gz). Prefer compressed file size when present, fall back to dumpFile.
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compressedCandidate := strings.TrimSuffix(dumpFile, ".dump") + ".sql.gz"
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if info, err := os.Stat(compressedCandidate); err == nil {
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e.printf(" ✅ Completed %s (%s)\n", dbName, formatBytes(info.Size()))
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} else if info, err := os.Stat(dumpFile); err == nil {
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e.printf(" ✅ Completed %s (%s)\n", dbName, formatBytes(info.Size()))
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}
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successCount++
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}
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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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e.printf(" Backup summary: %d succeeded, %d failed\n", successCount, failCount)
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if parallelism == 1 {
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e.printf(" Backing up %d databases sequentially...\n", len(databases))
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} else {
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e.printf(" Backing up %d databases with %d parallel workers...\n", len(databases), parallelism)
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}
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// Use worker pool for parallel backup
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var successCount, failCount int32
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var mu sync.Mutex // Protect shared resources (printf, estimator)
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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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for i, dbName := range databases {
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wg.Add(1)
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semaphore <- struct{}{} // Acquire
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go func(idx int, name 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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e.printf(" [%d/%d] Backing up database: %s\n", idx+1, len(databases), name)
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quietProgress.Update(fmt.Sprintf("Backing up database %d/%d: %s", idx+1, len(databases), name))
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mu.Unlock()
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// Check database size and warn if very large
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if size, err := e.db.GetDatabaseSize(ctx, name); err == nil {
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sizeStr := formatBytes(size)
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mu.Lock()
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e.printf(" Database size: %s\n", sizeStr)
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if size > 10*1024*1024*1024 { // > 10GB
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e.printf(" ⚠️ Large database detected - this may take a while\n")
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}
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mu.Unlock()
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}
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dumpFile := filepath.Join(tempDir, "dumps", name+".dump")
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compressionLevel := e.cfg.CompressionLevel
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if compressionLevel > 6 {
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compressionLevel = 6
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}
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format := "custom"
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parallel := e.cfg.DumpJobs
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if size, err := e.db.GetDatabaseSize(ctx, name); err == nil {
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if size > 5*1024*1024*1024 {
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format = "plain"
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compressionLevel = 0
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parallel = 0
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mu.Lock()
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e.printf(" Using plain format + external compression (optimal for large DBs)\n")
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mu.Unlock()
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}
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}
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options := database.BackupOptions{
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Compression: compressionLevel,
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Parallel: parallel,
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Format: format,
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Blobs: true,
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NoOwner: false,
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NoPrivileges: false,
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}
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cmd := e.db.BuildBackupCommand(name, dumpFile, options)
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dbCtx, cancel := context.WithTimeout(ctx, 2*time.Hour)
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defer cancel()
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err := e.executeCommand(dbCtx, cmd, dumpFile)
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cancel()
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if err != nil {
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e.log.Warn("Failed to backup database", "database", name, "error", err)
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mu.Lock()
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e.printf(" ⚠️ WARNING: Failed to backup %s: %v\n", name, err)
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mu.Unlock()
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atomic.AddInt32(&failCount, 1)
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} else {
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compressedCandidate := strings.TrimSuffix(dumpFile, ".dump") + ".sql.gz"
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mu.Lock()
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if info, err := os.Stat(compressedCandidate); err == nil {
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e.printf(" ✅ Completed %s (%s)\n", name, formatBytes(info.Size()))
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} else if info, err := os.Stat(dumpFile); err == nil {
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e.printf(" ✅ Completed %s (%s)\n", name, formatBytes(info.Size()))
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}
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mu.Unlock()
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atomic.AddInt32(&successCount, 1)
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}
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}(i, dbName)
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}
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// Wait for all backups 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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e.printf(" Backup summary: %d succeeded, %d failed\n", successCountFinal, failCountFinal)
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// Create archive
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e.printf(" Creating compressed archive...\n")
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