fmtorigin/improve-fuse-mount

3 files changed, 656 insertions, 277 deletions

diff --git a/weed/mount/ml/batch_optimizer.go b/weed/mount/ml/batch_optimizer.go
index d5dbfa636..12ef75947 100644
--- a/weed/mount/ml/batch_optimizer.go
+++ b/weed/mount/ml/batch_optimizer.go
@@ -12,155 +12,155 @@ import (
 type BatchAccessPattern int
 
 const (
-	BatchPatternUnknown BatchAccessPattern = iota
-	BatchPatternLinear                     // Linear batch processing
-	BatchPatternStrided                    // Strided access with fixed gaps
-	BatchPatternShuffled                   // Randomized batch order
-	BatchPatternHierarchical              // Hierarchical/nested batch access
-	BatchPatternMultiGPU                   // Multi-GPU distributed batches
-	BatchPatternPipelined                  // Pipelined batch processing
+	BatchPatternUnknown      BatchAccessPattern = iota
+	BatchPatternLinear                          // Linear batch processing
+	BatchPatternStrided                         // Strided access with fixed gaps
+	BatchPatternShuffled                        // Randomized batch order
+	BatchPatternHierarchical                    // Hierarchical/nested batch access
+	BatchPatternMultiGPU                        // Multi-GPU distributed batches
+	BatchPatternPipelined                       // Pipelined batch processing
 )
 
 // BatchAccess represents a single file access that's part of batch processing
 type BatchAccess struct {
-	Offset      int64         // File offset
-	Size        int           // Access size
-	AccessTime  time.Time     // When accessed
-	IsRead      bool          // Whether this was a read operation
-	BatchHint   string        // Optional batch identifier hint
+	Offset     int64     // File offset
+	Size       int       // Access size
+	AccessTime time.Time // When accessed
+	IsRead     bool      // Whether this was a read operation
+	BatchHint  string    // Optional batch identifier hint
 }
 
 // BatchInfo holds information about a detected batch
 type BatchInfo struct {
 	sync.RWMutex
-	
+
 	// Batch identification
-	BatchID           string            // Unique batch identifier
-	StartOffset       int64             // Starting file offset
-	EndOffset         int64             // Ending file offset
-	Size              int64             // Total batch size in bytes
-	ItemCount         int               // Number of items in batch
-	ItemSize          int64             // Average item size
-	
+	BatchID     string // Unique batch identifier
+	StartOffset int64  // Starting file offset
+	EndOffset   int64  // Ending file offset
+	Size        int64  // Total batch size in bytes
+	ItemCount   int    // Number of items in batch
+	ItemSize    int64  // Average item size
+
 	// Access pattern
-	AccessPattern     BatchAccessPattern // Detected access pattern
-	AccessOrder       []int64            // Order of access within batch
-	AccessTimes       []time.Time        // When each item was accessed
-	ProcessingTime    time.Duration      // Total time to process batch
-	
+	AccessPattern  BatchAccessPattern // Detected access pattern
+	AccessOrder    []int64            // Order of access within batch
+	AccessTimes    []time.Time        // When each item was accessed
+	ProcessingTime time.Duration      // Total time to process batch
+
 	// Performance metrics
-	LoadTime          time.Duration      // Time to load batch from storage
-	ProcessTime       time.Duration      // Time to process batch (compute)
-	TotalTime         time.Duration      // Total end-to-end time
-	Throughput        float64            // Items per second
-	
+	LoadTime    time.Duration // Time to load batch from storage
+	ProcessTime time.Duration // Time to process batch (compute)
+	TotalTime   time.Duration // Total end-to-end time
+	Throughput  float64       // Items per second
+
 	// Optimization state
-	IsPrefetched      bool               // Whether batch was prefetched
-	CacheHitRate      float64            // Percentage of cache hits
-	OptimalPrefetch   int64              // Recommended prefetch size
-	
+	IsPrefetched    bool    // Whether batch was prefetched
+	CacheHitRate    float64 // Percentage of cache hits
+	OptimalPrefetch int64   // Recommended prefetch size
+
 	// Relationship to other batches
-	PreviousBatch     *BatchInfo         // Previous batch in sequence
-	NextBatch         *BatchInfo         // Next batch in sequence
-	ParentBatch       *BatchInfo         // Parent batch (for hierarchical)
-	ChildBatches      []*BatchInfo       // Child batches (for hierarchical)
+	PreviousBatch *BatchInfo   // Previous batch in sequence
+	NextBatch     *BatchInfo   // Next batch in sequence
+	ParentBatch   *BatchInfo   // Parent batch (for hierarchical)
+	ChildBatches  []*BatchInfo // Child batches (for hierarchical)
 }
 
 // BatchOptimizer optimizes batch access patterns for ML workloads
 type BatchOptimizer struct {
 	sync.RWMutex
-	
+
 	// Configuration
-	maxBatchesTracked    int                           // Maximum number of batches to track
-	batchDetectionWindow int                           // Window size for batch detection
-	minBatchSize         int64                         // Minimum size to consider as batch
-	maxBatchSize         int64                         // Maximum size to consider as batch
-	
+	maxBatchesTracked    int   // Maximum number of batches to track
+	batchDetectionWindow int   // Window size for batch detection
+	minBatchSize         int64 // Minimum size to consider as batch
+	maxBatchSize         int64 // Maximum size to consider as batch
+
 	// Batch tracking
-	activeBatches        map[string]*BatchInfo         // Currently active batches
-	completedBatches     map[string]*BatchInfo         // Recently completed batches
-	inodeToBatches       map[uint64][]*BatchInfo       // File to batches mapping
-	
+	activeBatches    map[string]*BatchInfo   // Currently active batches
+	completedBatches map[string]*BatchInfo   // Recently completed batches
+	inodeToBatches   map[uint64][]*BatchInfo // File to batches mapping
+
 	// Pattern detection
-	accessHistory        map[uint64][]BatchAccess      // Recent access history per file
-	batchSequences       map[uint64]*BatchSequence     // Detected batch sequences
-	
+	accessHistory  map[uint64][]BatchAccess  // Recent access history per file
+	batchSequences map[uint64]*BatchSequence // Detected batch sequences
+
 	// Optimization strategies
-	prefetchStrategies   map[BatchAccessPattern]*PrefetchConfig  // Prefetch configs per pattern
-	cacheStrategies      map[BatchAccessPattern]*CacheConfig     // Cache configs per pattern
-	
+	prefetchStrategies map[BatchAccessPattern]*PrefetchConfig // Prefetch configs per pattern
+	cacheStrategies    map[BatchAccessPattern]*CacheConfig    // Cache configs per pattern
+
 	// Statistics
-	totalBatchesDetected int64                         // Total batches detected
-	optimizationHits     int64                         // Successful optimization applications
-	optimizationMisses   int64                         // Failed optimization attempts
-	
+	totalBatchesDetected int64 // Total batches detected
+	optimizationHits     int64 // Successful optimization applications
+	optimizationMisses   int64 // Failed optimization attempts
+
 	// Background processing
-	cleanupTicker        *time.Ticker                  // Cleanup timer
-	stopCleanup          chan struct{}                 // Cleanup stop signal
+	cleanupTicker *time.Ticker  // Cleanup timer
+	stopCleanup   chan struct{} // Cleanup stop signal
 }
 
 // BatchSequence represents a sequence of related batches
 type BatchSequence struct {
 	sync.RWMutex
-	
-	SequenceID      string               // Unique sequence identifier
-	Batches         []*BatchInfo         // Batches in sequence
-	Pattern         BatchAccessPattern   // Overall sequence pattern
-	StartTime       time.Time            // When sequence started
-	LastAccess      time.Time            // Last access in sequence
-	IsComplete      bool                 // Whether sequence is complete
-	RepeatCount     int                  // How many times sequence has repeated
-	
+
+	SequenceID  string             // Unique sequence identifier
+	Batches     []*BatchInfo       // Batches in sequence
+	Pattern     BatchAccessPattern // Overall sequence pattern
+	StartTime   time.Time          // When sequence started
+	LastAccess  time.Time          // Last access in sequence
+	IsComplete  bool               // Whether sequence is complete
+	RepeatCount int                // How many times sequence has repeated
+
 	// Predictions
-	NextBatchOffset int64                // Predicted next batch offset
-	NextBatchSize   int64                // Predicted next batch size
-	Confidence      float64              // Confidence in predictions (0-1)
+	NextBatchOffset int64   // Predicted next batch offset
+	NextBatchSize   int64   // Predicted next batch size
+	Confidence      float64 // Confidence in predictions (0-1)
 }
 
 // PrefetchConfig holds configuration for prefetching strategies
 type PrefetchConfig struct {
-	Strategy        PrefetchStrategy    // Which prefetch strategy to use
-	LookaheadCount  int                // How many items to prefetch ahead
-	PrefetchSize    int64              // Size to prefetch per operation
-	ConcurrencyLevel int               // How many concurrent prefetch operations
-	AdaptiveScaling bool               // Whether to scale based on performance
+	Strategy         PrefetchStrategy // Which prefetch strategy to use
+	LookaheadCount   int              // How many items to prefetch ahead
+	PrefetchSize     int64            // Size to prefetch per operation
+	ConcurrencyLevel int              // How many concurrent prefetch operations
+	AdaptiveScaling  bool             // Whether to scale based on performance
 }
 
-// CacheConfig holds configuration for caching strategies  
+// CacheConfig holds configuration for caching strategies
 type CacheConfig struct {
-	Policy          CachePolicy        // Which cache policy to use
-	RetentionTime   time.Duration      // How long to keep items cached
-	Priority        CachePriority      // Cache priority level
-	PreloadBatches  int               // How many batches to preload
+	Policy         CachePolicy   // Which cache policy to use
+	RetentionTime  time.Duration // How long to keep items cached
+	Priority       CachePriority // Cache priority level
+	PreloadBatches int           // How many batches to preload
 }
 
 // NewBatchOptimizer creates a new batch optimizer
 func NewBatchOptimizer() *BatchOptimizer {
 	bo := &BatchOptimizer{
-		maxBatchesTracked:    1000,                    // Track up to 1000 batches
-		batchDetectionWindow: 100,                     // Look at last 100 accesses
-		minBatchSize:         64 * 1024,               // Minimum 64KB batch
-		maxBatchSize:         100 * 1024 * 1024,       // Maximum 100MB batch
-		
-		activeBatches:        make(map[string]*BatchInfo),
-		completedBatches:     make(map[string]*BatchInfo),
-		inodeToBatches:       make(map[uint64][]*BatchInfo),
-		accessHistory:        make(map[uint64][]BatchAccess),
-		batchSequences:       make(map[uint64]*BatchSequence),
-		
-		prefetchStrategies:   make(map[BatchAccessPattern]*PrefetchConfig),
-		cacheStrategies:      make(map[BatchAccessPattern]*CacheConfig),
-		
-		stopCleanup:          make(chan struct{}),
-	}
-	
+		maxBatchesTracked:    1000,              // Track up to 1000 batches
+		batchDetectionWindow: 100,               // Look at last 100 accesses
+		minBatchSize:         64 * 1024,         // Minimum 64KB batch
+		maxBatchSize:         100 * 1024 * 1024, // Maximum 100MB batch
+
+		activeBatches:    make(map[string]*BatchInfo),
+		completedBatches: make(map[string]*BatchInfo),
+		inodeToBatches:   make(map[uint64][]*BatchInfo),
+		accessHistory:    make(map[uint64][]BatchAccess),
+		batchSequences:   make(map[uint64]*BatchSequence),
+
+		prefetchStrategies: make(map[BatchAccessPattern]*PrefetchConfig),
+		cacheStrategies:    make(map[BatchAccessPattern]*CacheConfig),
+
+		stopCleanup: make(chan struct{}),
+	}
+
 	// Initialize default strategies
 	bo.initializeDefaultStrategies()
-	
+
 	// Start cleanup routine
 	bo.cleanupTicker = time.NewTicker(5 * time.Minute)
 	go bo.cleanupRoutine()
-	
+
 	glog.V(1).Infof("Batch optimizer initialized")
 	return bo
 }
@@ -169,11 +169,11 @@ func NewBatchOptimizer() *BatchOptimizer {
 func (bo *BatchOptimizer) initializeDefaultStrategies() {
 	// Linear batch pattern - aggressive prefetching
 	bo.prefetchStrategies[BatchPatternLinear] = &PrefetchConfig{
-		Strategy:        PrefetchAggressive,
-		LookaheadCount:  5,
-		PrefetchSize:    2 * 1024 * 1024, // 2MB
+		Strategy:         PrefetchAggressive,
+		LookaheadCount:   5,
+		PrefetchSize:     2 * 1024 * 1024, // 2MB
 		ConcurrencyLevel: 3,
-		AdaptiveScaling: true,
+		AdaptiveScaling:  true,
 	}
 	bo.cacheStrategies[BatchPatternLinear] = &CacheConfig{
 		Policy:         CachePolicyTrainingAware,
@@ -181,14 +181,14 @@ func (bo *BatchOptimizer) initializeDefaultStrategies() {
 		Priority:       CachePriorityHigh,
 		PreloadBatches: 2,
 	}
-	
+
 	// Shuffled batch pattern - conservative prefetching
 	bo.prefetchStrategies[BatchPatternShuffled] = &PrefetchConfig{
-		Strategy:        PrefetchBalanced,
-		LookaheadCount:  2,
-		PrefetchSize:    512 * 1024, // 512KB
+		Strategy:         PrefetchBalanced,
+		LookaheadCount:   2,
+		PrefetchSize:     512 * 1024, // 512KB
 		ConcurrencyLevel: 2,
-		AdaptiveScaling: true,
+		AdaptiveScaling:  true,
 	}
 	bo.cacheStrategies[BatchPatternShuffled] = &CacheConfig{
 		Policy:         CachePolicyLRU,
@@ -196,14 +196,14 @@ func (bo *BatchOptimizer) initializeDefaultStrategies() {
 		Priority:       CachePriorityNormal,
 		PreloadBatches: 1,
 	}
-	
+
 	// Multi-GPU pattern - high concurrency
 	bo.prefetchStrategies[BatchPatternMultiGPU] = &PrefetchConfig{
-		Strategy:        PrefetchAggressive,
-		LookaheadCount:  8,
-		PrefetchSize:    4 * 1024 * 1024, // 4MB
+		Strategy:         PrefetchAggressive,
+		LookaheadCount:   8,
+		PrefetchSize:     4 * 1024 * 1024, // 4MB
 		ConcurrencyLevel: 6,
-		AdaptiveScaling: true,
+		AdaptiveScaling:  true,
 	}
 	bo.cacheStrategies[BatchPatternMultiGPU] = &CacheConfig{
 		Policy:         CachePolicyML,
@@ -217,7 +217,7 @@ func (bo *BatchOptimizer) initializeDefaultStrategies() {
 func (bo *BatchOptimizer) RecordBatchAccess(inode uint64, offset int64, size int, isRead bool, batchHint string) *BatchInfo {
 	bo.Lock()
 	defer bo.Unlock()
-	
+
 	access := BatchAccess{
 		Offset:     offset,
 		Size:       size,
@@ -225,7 +225,7 @@ func (bo *BatchOptimizer) RecordBatchAccess(inode uint64, offset int64, size int
 		IsRead:     isRead,
 		BatchHint:  batchHint,
 	}
-	
+
 	// Add to access history
 	history := bo.accessHistory[inode]
 	history = append(history, access)
@@ -233,23 +233,23 @@ func (bo *BatchOptimizer) RecordBatchAccess(inode uint64, offset int64, size int
 		history = history[1:] // Keep only recent accesses
 	}
 	bo.accessHistory[inode] = history
-	
+
 	// Detect batch patterns
 	batchInfo := bo.detectBatchPattern(inode, history)
 	if batchInfo != nil {
 		bo.totalBatchesDetected++
-		
+
 		// Add to tracking
 		bo.activeBatches[batchInfo.BatchID] = batchInfo
 		bo.inodeToBatches[inode] = append(bo.inodeToBatches[inode], batchInfo)
-		
+
 		// Update batch sequence
 		bo.updateBatchSequence(inode, batchInfo)
-		
-		glog.V(3).Infof("Detected batch: inode=%d, pattern=%v, size=%d, items=%d", 
+
+		glog.V(3).Infof("Detected batch: inode=%d, pattern=%v, size=%d, items=%d",
 			inode, batchInfo.AccessPattern, batchInfo.Size, batchInfo.ItemCount)
 	}
-	
+
 	return batchInfo
 }
 
@@ -258,25 +258,29 @@ func (bo *BatchOptimizer) detectBatchPattern(inode uint64, history []BatchAccess
 	if len(history) < 3 {
 		return nil // Need minimum history
 	}
-	
+
 	// Look for batch boundaries by analyzing access gaps and patterns
-	recent := history[len(history)-10:] // Look at last 10 accesses
+	startIdx := len(history) - 10
+	if startIdx < 0 {
+		startIdx = 0
+	}
+	recent := history[startIdx:] // Look at last 10 accesses (or all if fewer)
 	if len(recent) < 3 {
 		recent = history
 	}
-	
+
 	// Check for batch characteristics
 	batchInfo := bo.analyzePotentialBatch(recent, inode)
 	if batchInfo == nil {
 		return nil
 	}
-	
+
 	// Determine access pattern
 	batchInfo.AccessPattern = bo.classifyBatchPattern(batchInfo, recent)
-	
+
 	// Calculate performance metrics
 	bo.calculateBatchMetrics(batchInfo, recent)
-	
+
 	return batchInfo
 }
 
@@ -285,60 +289,60 @@ func (bo *BatchOptimizer) analyzePotentialBatch(accesses []BatchAccess, inode ui
 	if len(accesses) < 2 {
 		return nil
 	}
-	
+
 	// Calculate basic statistics
 	var totalSize int64
 	var itemCount int
 	minOffset := accesses[0].Offset
 	maxOffset := accesses[0].Offset
-	
+
 	accessOrder := make([]int64, len(accesses))
 	accessTimes := make([]time.Time, len(accesses))
-	
+
 	for i, access := range accesses {
 		totalSize += int64(access.Size)
 		itemCount++
-		
+
 		if access.Offset < minOffset {
 			minOffset = access.Offset
 		}
 		if access.Offset > maxOffset {
 			maxOffset = access.Offset
 		}
-		
+
 		accessOrder[i] = access.Offset
 		accessTimes[i] = access.AccessTime
 	}
-	
+
 	batchSize := maxOffset - minOffset + int64(accesses[len(accesses)-1].Size)
-	
+
 	// Check if this qualifies as a batch
 	if batchSize < bo.minBatchSize || batchSize > bo.maxBatchSize {
 		return nil
 	}
-	
+
 	// Check temporal locality (accesses should be close in time)
 	timeSpan := accessTimes[len(accessTimes)-1].Sub(accessTimes[0])
 	if timeSpan > 10*time.Minute { // Too spread out in time
 		return nil
 	}
-	
+
 	// Create batch info
 	batchID := generateBatchID(inode, minOffset, time.Now())
-	
+
 	batchInfo := &BatchInfo{
-		BatchID:      batchID,
-		StartOffset:  minOffset,
-		EndOffset:    maxOffset,
-		Size:         batchSize,
-		ItemCount:    itemCount,
-		ItemSize:     totalSize / int64(itemCount),
-		AccessOrder:  accessOrder,
-		AccessTimes:  accessTimes,
-		TotalTime:    timeSpan,
-		LoadTime:     timeSpan, // Initially assume all time is load time
-	}
-	
+		BatchID:     batchID,
+		StartOffset: minOffset,
+		EndOffset:   maxOffset,
+		Size:        batchSize,
+		ItemCount:   itemCount,
+		ItemSize:    totalSize / int64(itemCount),
+		AccessOrder: accessOrder,
+		AccessTimes: accessTimes,
+		TotalTime:   timeSpan,
+		LoadTime:    timeSpan, // Initially assume all time is load time
+	}
+
 	return batchInfo
 }
 
@@ -347,7 +351,7 @@ func (bo *BatchOptimizer) classifyBatchPattern(batch *BatchInfo, accesses []Batc
 	if len(batch.AccessOrder) < 2 {
 		return BatchPatternUnknown
 	}
-	
+
 	// Check for linear pattern (sequential offsets)
 	isLinear := true
 	for i := 1; i < len(batch.AccessOrder); i++ {
@@ -356,31 +360,31 @@ func (bo *BatchOptimizer) classifyBatchPattern(batch *BatchInfo, accesses []Batc
 			break
 		}
 	}
-	
+
 	if isLinear {
 		return BatchPatternLinear
 	}
-	
+
 	// Check for strided pattern (regular gaps)
 	if bo.isStridedPattern(batch.AccessOrder) {
 		return BatchPatternStrided
 	}
-	
+
 	// Check for shuffled pattern (randomized order)
 	if bo.isShuffledPattern(batch.AccessOrder) {
 		return BatchPatternShuffled
 	}
-	
+
 	// Check for multi-GPU pattern (parallel access indicators)
 	if bo.isMultiGPUPattern(accesses) {
 		return BatchPatternMultiGPU
 	}
-	
+
 	// Check for pipelined pattern (overlapping accesses)
 	if bo.isPipelinedPattern(batch.AccessTimes) {
 		return BatchPatternPipelined
 	}
-	
+
 	return BatchPatternUnknown
 }
 
@@ -389,13 +393,13 @@ func (bo *BatchOptimizer) isStridedPattern(offsets []int64) bool {
 	if len(offsets) < 3 {
 		return false
 	}
-	
+
 	// Calculate stride
 	stride := offsets[1] - offsets[0]
 	if stride <= 0 {
 		return false
 	}
-	
+
 	// Check if all accesses follow the same stride
 	consistentStrides := 0
 	for i := 2; i < len(offsets); i++ {
@@ -404,9 +408,9 @@ func (bo *BatchOptimizer) isStridedPattern(offsets []int64) bool {
 			consistentStrides++
 		}
 	}
-	
+
 	// At least 80% of strides should be consistent
-	return float64(consistentStrides) / float64(len(offsets)-2) >= 0.8
+	return float64(consistentStrides)/float64(len(offsets)-2) >= 0.8
 }
 
 // isShuffledPattern checks if accesses are in randomized order
@@ -414,7 +418,7 @@ func (bo *BatchOptimizer) isShuffledPattern(offsets []int64) bool {
 	if len(offsets) < 5 {
 		return false
 	}
-	
+
 	// Count inversions (out-of-order pairs)
 	inversions := 0
 	for i := 0; i < len(offsets); i++ {
@@ -424,10 +428,10 @@ func (bo *BatchOptimizer) isShuffledPattern(offsets []int64) bool {
 			}
 		}
 	}
-	
+
 	totalPairs := len(offsets) * (len(offsets) - 1) / 2
 	inversionRate := float64(inversions) / float64(totalPairs)
-	
+
 	// High inversion rate suggests shuffling
 	return inversionRate > 0.3
 }
@@ -437,22 +441,22 @@ func (bo *BatchOptimizer) isMultiGPUPattern(accesses []BatchAccess) bool {
 	// Look for multiple concurrent access streams
 	// This is a simplified heuristic - in practice, this would need more
 	// sophisticated detection based on process info, etc.
-	
+
 	if len(accesses) < 4 {
 		return false
 	}
-	
+
 	// Check for concurrent accesses (multiple accesses in very short time)
 	concurrentWindows := 0
 	windowSize := 100 * time.Millisecond
-	
+
 	for i := 0; i < len(accesses)-1; i++ {
 		timeDiff := accesses[i+1].AccessTime.Sub(accesses[i].AccessTime)
 		if timeDiff < windowSize {
 			concurrentWindows++
 		}
 	}
-	
+
 	// If many accesses are concurrent, might be multi-GPU
 	return float64(concurrentWindows)/float64(len(accesses)) > 0.5
 }
@@ -462,30 +466,30 @@ func (bo *BatchOptimizer) isPipelinedPattern(accessTimes []time.Time) bool {
 	if len(accessTimes) < 3 {
 		return false
 	}
-	
+
 	// Look for regular, overlapping timing patterns
 	intervals := make([]time.Duration, len(accessTimes)-1)
 	for i := 1; i < len(accessTimes); i++ {
 		intervals[i-1] = accessTimes[i].Sub(accessTimes[i-1])
 	}
-	
+
 	// Calculate coefficient of variation for intervals
 	var sum, sumSq time.Duration
 	for _, interval := range intervals {
 		sum += interval
 		sumSq += interval * interval
 	}
-	
+
 	n := time.Duration(len(intervals))
 	mean := sum / n
 	if mean == 0 {
 		return false
 	}
-	
+
 	// Calculate variance and CV
 	variance := (sumSq / n) - (mean * mean)
-	cv := float64(variance) / float64(mean * mean)
-	
+	cv := float64(variance) / float64(mean*mean)
+
 	// Low coefficient of variation suggests regular pipelining
 	return cv < 0.2
 }
@@ -495,18 +499,18 @@ func (bo *BatchOptimizer) calculateBatchMetrics(batch *BatchInfo, accesses []Bat
 	if len(batch.AccessTimes) < 2 {
 		return
 	}
-	
+
 	// Calculate throughput
 	timeSpan := batch.AccessTimes[len(batch.AccessTimes)-1].Sub(batch.AccessTimes[0])
 	if timeSpan > 0 {
 		batch.Throughput = float64(batch.ItemCount) / timeSpan.Seconds()
 	}
-	
+
 	// Estimate processing vs load time (heuristic)
 	// In practice, this would need more sophisticated measurement
 	avgItemTime := timeSpan / time.Duration(batch.ItemCount)
-	batch.ProcessTime = avgItemTime / 2  // Assume 50% processing time
-	batch.LoadTime = avgItemTime / 2     // Assume 50% load time
+	batch.ProcessTime = avgItemTime / 2 // Assume 50% processing time
+	batch.LoadTime = avgItemTime / 2    // Assume 50% load time
 }
 
 // updateBatchSequence updates the batch sequence for an inode
@@ -521,26 +525,26 @@ func (bo *BatchOptimizer) updateBatchSequence(inode uint64, newBatch *BatchInfo)
 		}
 		bo.batchSequences[inode] = sequence
 	}
-	
+
 	sequence.Lock()
 	defer sequence.Unlock()
-	
+
 	// Link batches
 	if len(sequence.Batches) > 0 {
 		lastBatch := sequence.Batches[len(sequence.Batches)-1]
 		lastBatch.NextBatch = newBatch
 		newBatch.PreviousBatch = lastBatch
 	}
-	
+
 	sequence.Batches = append(sequence.Batches, newBatch)
 	sequence.LastAccess = time.Now()
-	
+
 	// Update sequence pattern based on majority of batches
 	bo.updateSequencePattern(sequence)
-	
+
 	// Make predictions for next batch
 	bo.updateSequencePredictions(sequence)
-	
+
 	// Keep sequence size manageable
 	if len(sequence.Batches) > 100 {
 		sequence.Batches = sequence.Batches[len(sequence.Batches)-50:] // Keep last 50 batches
@@ -552,13 +556,13 @@ func (bo *BatchOptimizer) updateSequencePattern(sequence *BatchSequence) {
 	if len(sequence.Batches) < 3 {
 		return
 	}
-	
+
 	// Count patterns
 	patternCounts := make(map[BatchAccessPattern]int)
 	for _, batch := range sequence.Batches {
 		patternCounts[batch.AccessPattern]++
 	}
-	
+
 	// Find most common pattern
 	maxCount := 0
 	var dominantPattern BatchAccessPattern
@@ -568,7 +572,7 @@ func (bo *BatchOptimizer) updateSequencePattern(sequence *BatchSequence) {
 			dominantPattern = pattern
 		}
 	}
-	
+
 	sequence.Pattern = dominantPattern
 }
 
@@ -577,12 +581,12 @@ func (bo *BatchOptimizer) updateSequencePredictions(sequence *BatchSequence) {
 	if len(sequence.Batches) < 2 {
 		return
 	}
-	
+
 	recent := sequence.Batches[len(sequence.Batches)-3:] // Last 3 batches
 	if len(recent) < 2 {
 		recent = sequence.Batches
 	}
-	
+
 	// Predict next batch offset based on pattern
 	switch sequence.Pattern {
 	case BatchPatternLinear:
@@ -595,7 +599,7 @@ func (bo *BatchOptimizer) updateSequencePredictions(sequence *BatchSequence) {
 			sequence.NextBatchSize = lastBatch.Size
 			sequence.Confidence = 0.8
 		}
-		
+
 	case BatchPatternStrided:
 		// Regular stride
 		if len(recent) >= 3 {
@@ -604,7 +608,7 @@ func (bo *BatchOptimizer) updateSequencePredictions(sequence *BatchSequence) {
 			sequence.NextBatchSize = recent[len(recent)-1].Size
 			sequence.Confidence = 0.7
 		}
-		
+
 	default:
 		// Lower confidence for unpredictable patterns
 		sequence.Confidence = 0.3
@@ -615,60 +619,60 @@ func (bo *BatchOptimizer) updateSequencePredictions(sequence *BatchSequence) {
 func (bo *BatchOptimizer) GetBatchRecommendations(inode uint64) *BatchOptimizationRecommendations {
 	bo.RLock()
 	defer bo.RUnlock()
-	
+
 	sequence := bo.batchSequences[inode]
 	if sequence == nil {
 		return &BatchOptimizationRecommendations{
 			ShouldOptimize: false,
 		}
 	}
-	
+
 	sequence.RLock()
 	defer sequence.RUnlock()
-	
+
 	prefetchConfig := bo.prefetchStrategies[sequence.Pattern]
 	cacheConfig := bo.cacheStrategies[sequence.Pattern]
-	
+
 	if prefetchConfig == nil {
 		prefetchConfig = bo.prefetchStrategies[BatchPatternUnknown]
 	}
 	if cacheConfig == nil {
 		cacheConfig = bo.cacheStrategies[BatchPatternUnknown]
 	}
-	
+
 	recommendations := &BatchOptimizationRecommendations{
-		ShouldOptimize:    true,
-		Pattern:           sequence.Pattern,
-		PrefetchSize:      prefetchConfig.PrefetchSize,
-		PrefetchCount:     prefetchConfig.LookaheadCount,
-		CachePriority:     cacheConfig.Priority,
-		CacheRetention:    cacheConfig.RetentionTime,
-		NextBatchOffset:   sequence.NextBatchOffset,
-		NextBatchSize:     sequence.NextBatchSize,
-		Confidence:        sequence.Confidence,
-	}
-	
+		ShouldOptimize:  true,
+		Pattern:         sequence.Pattern,
+		PrefetchSize:    prefetchConfig.PrefetchSize,
+		PrefetchCount:   prefetchConfig.LookaheadCount,
+		CachePriority:   cacheConfig.Priority,
+		CacheRetention:  cacheConfig.RetentionTime,
+		NextBatchOffset: sequence.NextBatchOffset,
+		NextBatchSize:   sequence.NextBatchSize,
+		Confidence:      sequence.Confidence,
+	}
+
 	return recommendations
 }
 
 // BatchOptimizationRecommendations holds batch optimization recommendations
 type BatchOptimizationRecommendations struct {
-	ShouldOptimize   bool                 `json:"should_optimize"`
-	Pattern          BatchAccessPattern   `json:"pattern"`
-	PrefetchSize     int64               `json:"prefetch_size"`
-	PrefetchCount    int                 `json:"prefetch_count"`
-	CachePriority    CachePriority       `json:"cache_priority"`
-	CacheRetention   time.Duration       `json:"cache_retention"`
-	NextBatchOffset  int64               `json:"next_batch_offset"`
-	NextBatchSize    int64               `json:"next_batch_size"`
-	Confidence       float64             `json:"confidence"`
+	ShouldOptimize  bool               `json:"should_optimize"`
+	Pattern         BatchAccessPattern `json:"pattern"`
+	PrefetchSize    int64              `json:"prefetch_size"`
+	PrefetchCount   int                `json:"prefetch_count"`
+	CachePriority   CachePriority      `json:"cache_priority"`
+	CacheRetention  time.Duration      `json:"cache_retention"`
+	NextBatchOffset int64              `json:"next_batch_offset"`
+	NextBatchSize   int64              `json:"next_batch_size"`
+	Confidence      float64            `json:"confidence"`
 }
 
 // GetBatchMetrics returns comprehensive batch optimization metrics
 func (bo *BatchOptimizer) GetBatchMetrics() BatchOptimizerMetrics {
 	bo.RLock()
 	defer bo.RUnlock()
-	
+
 	metrics := BatchOptimizerMetrics{
 		TotalBatchesDetected: bo.totalBatchesDetected,
 		ActiveBatches:        int64(len(bo.activeBatches)),
@@ -677,32 +681,32 @@ func (bo *BatchOptimizer) GetBatchMetrics() BatchOptimizerMetrics {
 		OptimizationMisses:   bo.optimizationMisses,
 		PatternCounts:        make(map[BatchAccessPattern]int64),
 	}
-	
+
 	// Count patterns
 	for _, batch := range bo.activeBatches {
 		batch.RLock()
 		metrics.PatternCounts[batch.AccessPattern]++
 		batch.RUnlock()
 	}
-	
+
 	// Calculate hit rate
 	totalAttempts := bo.optimizationHits + bo.optimizationMisses
 	if totalAttempts > 0 {
 		metrics.OptimizationHitRate = float64(bo.optimizationHits) / float64(totalAttempts)
 	}
-	
+
 	return metrics
 }
 
 // BatchOptimizerMetrics holds metrics for batch optimization
 type BatchOptimizerMetrics struct {
-	TotalBatchesDetected  int64                              `json:"total_batches_detected"`
-	ActiveBatches         int64                              `json:"active_batches"`
-	CompletedBatches      int64                              `json:"completed_batches"`
-	OptimizationHits      int64                              `json:"optimization_hits"`
-	OptimizationMisses    int64                              `json:"optimization_misses"`
-	OptimizationHitRate   float64                            `json:"optimization_hit_rate"`
-	PatternCounts         map[BatchAccessPattern]int64       `json:"pattern_counts"`
+	TotalBatchesDetected int64                        `json:"total_batches_detected"`
+	ActiveBatches        int64                        `json:"active_batches"`
+	CompletedBatches     int64                        `json:"completed_batches"`
+	OptimizationHits     int64                        `json:"optimization_hits"`
+	OptimizationMisses   int64                        `json:"optimization_misses"`
+	OptimizationHitRate  float64                      `json:"optimization_hit_rate"`
+	PatternCounts        map[BatchAccessPattern]int64 `json:"pattern_counts"`
 }
 
 // cleanupRoutine performs periodic cleanup of old batch information
@@ -721,21 +725,21 @@ func (bo *BatchOptimizer) cleanupRoutine() {
 func (bo *BatchOptimizer) performCleanup() {
 	bo.Lock()
 	defer bo.Unlock()
-	
+
 	now := time.Now()
 	cutoff := now.Add(-30 * time.Minute) // Remove batches older than 30 minutes
-	
+
 	// Clean up completed batches
 	for id, batch := range bo.completedBatches {
 		batch.RLock()
 		shouldRemove := len(batch.AccessTimes) > 0 && batch.AccessTimes[0].Before(cutoff)
 		batch.RUnlock()
-		
+
 		if shouldRemove {
 			delete(bo.completedBatches, id)
 		}
 	}
-	
+
 	// Clean up access history
 	for inode, history := range bo.accessHistory {
 		filtered := make([]BatchAccess, 0, len(history))
@@ -744,14 +748,14 @@ func (bo *BatchOptimizer) performCleanup() {
 				filtered = append(filtered, access)
 			}
 		}
-		
+
 		if len(filtered) == 0 {
 			delete(bo.accessHistory, inode)
 		} else {
 			bo.accessHistory[inode] = filtered
 		}
 	}
-	
+
 	// Clean up batch sequences
 	for inode, sequence := range bo.batchSequences {
 		sequence.Lock()
@@ -762,7 +766,7 @@ func (bo *BatchOptimizer) performCleanup() {
 		}
 		sequence.Unlock()
 	}
-	
+
 	glog.V(4).Infof("Batch optimizer cleanup completed")
 }
 
@@ -771,9 +775,9 @@ func (bo *BatchOptimizer) Shutdown() {
 	if bo.cleanupTicker != nil {
 		bo.cleanupTicker.Stop()
 	}
-	
+
 	close(bo.stopCleanup)
-	
+
 	glog.V(1).Infof("Batch optimizer shutdown complete")
 }
 
diff --git a/weed/mount/ml/optimization_engine_test.go b/weed/mount/ml/optimization_engine_test.go
new file mode 100644
index 000000000..3e6e5bbdb
--- /dev/null
+++ b/weed/mount/ml/optimization_engine_test.go
@@ -0,0 +1,367 @@
+package ml
+
+import (
+	"testing"
+)
+
+// TestOptimizationEngine_Basic tests the basic functionality of the optimization engine
+func TestOptimizationEngine_Basic(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	if engine == nil {
+		t.Fatal("Should create optimization engine")
+	}
+
+	if !engine.enabled {
+		t.Error("Engine should be enabled")
+	}
+
+	// Check that default rules and strategies are loaded
+	if len(engine.rules) == 0 {
+		t.Error("Should have default rules loaded")
+	}
+
+	if len(engine.strategies) == 0 {
+		t.Error("Should have default strategies loaded")
+	}
+
+	t.Logf("Engine initialized with %d rules, %d strategies", len(engine.rules), len(engine.strategies))
+}
+
+// TestOptimizationEngine_RuleEvaluation tests rule evaluation
+func TestOptimizationEngine_RuleEvaluation(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	// Create test context for sequential access of a large model file
+	context := &OptimizationContext{
+		FilePath:        "/models/large_model.pth",
+		FileSize:        2 * 1024 * 1024 * 1024, // 2GB
+		FileType:        "model",
+		AccessPattern:   SequentialAccess,
+		AccessFrequency: 10,
+		Framework:       "pytorch",
+		WorkloadType:    "training",
+	}
+
+	// Apply optimizations
+	result := engine.OptimizeAccess(context)
+
+	if result == nil {
+		t.Fatal("Should return optimization result")
+	}
+
+	if !result.Applied {
+		t.Error("Should apply optimizations for large model file with sequential access")
+	}
+
+	if result.Confidence < 0.5 {
+		t.Errorf("Expected confidence >= 0.5, got %.2f", result.Confidence)
+	}
+
+	if len(result.Optimizations) == 0 {
+		t.Error("Should have applied optimizations")
+	}
+
+	t.Logf("Applied %d optimizations with confidence %.2f",
+		len(result.Optimizations), result.Confidence)
+
+	for i, opt := range result.Optimizations {
+		t.Logf("Optimization %d: type=%s, target=%s", i+1, opt.Type, opt.Target)
+	}
+}
+
+// TestOptimizationEngine_FrameworkDetection tests framework detection
+func TestOptimizationEngine_FrameworkDetection(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	testCases := []struct {
+		filePath          string
+		expectedFramework string
+	}{
+		{"/models/model.pth", "pytorch"},
+		{"/models/model.pt", "pytorch"},
+		{"/models/saved_model.pb", "tensorflow"},
+		{"/models/model.h5", "tensorflow"},
+		{"/models/checkpoint.ckpt", "tensorflow"},
+		{"/data/dataset.tfrecord", "tensorflow"},
+		{"/unknown/file.bin", ""},
+	}
+
+	for _, tc := range testCases {
+		framework := engine.detectFramework(tc.filePath, nil)
+
+		if tc.expectedFramework == "" {
+			if framework != "" {
+				t.Errorf("File %s: expected no framework detection, got %s", tc.filePath, framework)
+			}
+		} else {
+			if framework != tc.expectedFramework {
+				t.Errorf("File %s: expected framework %s, got %s",
+					tc.filePath, tc.expectedFramework, framework)
+			}
+		}
+	}
+}
+
+// TestOptimizationEngine_FileTypeDetection tests file type detection
+func TestOptimizationEngine_FileTypeDetection(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	testCases := []struct {
+		filePath     string
+		expectedType string
+	}{
+		{"/models/model.pth", "model"},
+		{"/data/dataset.csv", "dataset"},
+		{"/configs/config.yaml", "config"},
+		{"/logs/training.log", "log"},
+		{"/unknown/file.bin", "unknown"},
+	}
+
+	for _, tc := range testCases {
+		fileType := engine.detectFileType(tc.filePath)
+
+		if fileType != tc.expectedType {
+			t.Errorf("File %s: expected type %s, got %s",
+				tc.filePath, tc.expectedType, fileType)
+		}
+	}
+}
+
+// TestOptimizationEngine_ConditionEvaluation tests condition evaluation
+func TestOptimizationEngine_ConditionEvaluation(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	context := &OptimizationContext{
+		FilePath:      "/models/test.pth",
+		FileSize:      5 * 1024 * 1024, // 5MB
+		FileType:      "model",
+		AccessPattern: SequentialAccess,
+		Framework:     "pytorch",
+	}
+
+	// Test various condition types
+	testConditions := []struct {
+		condition RuleCondition
+		expected  bool
+	}{
+		{
+			condition: RuleCondition{
+				Type:     "file_pattern",
+				Property: "extension",
+				Operator: "equals",
+				Value:    ".pth",
+			},
+			expected: true,
+		},
+		{
+			condition: RuleCondition{
+				Type:     "file_context",
+				Property: "size",
+				Operator: "greater_than",
+				Value:    1024 * 1024, // 1MB
+			},
+			expected: true,
+		},
+		{
+			condition: RuleCondition{
+				Type:     "access_pattern",
+				Property: "pattern_type",
+				Operator: "equals",
+				Value:    "sequential",
+			},
+			expected: true,
+		},
+		{
+			condition: RuleCondition{
+				Type:     "workload_context",
+				Property: "framework",
+				Operator: "equals",
+				Value:    "tensorflow",
+			},
+			expected: false,
+		},
+	}
+
+	for i, tc := range testConditions {
+		result := engine.evaluateCondition(tc.condition, context)
+		if result != tc.expected {
+			t.Errorf("Condition %d: expected %v, got %v", i+1, tc.expected, result)
+		}
+	}
+}
+
+// TestOptimizationEngine_PluginSystem tests the plugin system
+func TestOptimizationEngine_PluginSystem(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	// Register a test plugin
+	plugin := NewPyTorchPlugin()
+	err := engine.RegisterPlugin(plugin)
+	if err != nil {
+		t.Fatalf("Failed to register plugin: %v", err)
+	}
+
+	// Verify plugin is registered
+	if _, exists := engine.plugins["pytorch"]; !exists {
+		t.Error("PyTorch plugin should be registered")
+	}
+
+	// Test framework detection through plugin
+	confidence := plugin.DetectFramework("/models/test.pth", nil)
+	if confidence < 0.5 {
+		t.Errorf("Expected high confidence for .pth file, got %.2f", confidence)
+	}
+
+	// Test optimization hints
+	context := &OptimizationContext{
+		FilePath:  "/models/test.pth",
+		FileSize:  100 * 1024 * 1024, // 100MB
+		FileType:  "model",
+		Framework: "pytorch",
+	}
+
+	hints := plugin.GetOptimizationHints(context)
+	if len(hints) == 0 {
+		t.Error("Plugin should provide optimization hints")
+	}
+
+	t.Logf("Plugin provided %d optimization hints", len(hints))
+}
+
+// TestOptimizationEngine_UsagePatterns tests usage pattern learning
+func TestOptimizationEngine_UsagePatterns(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	context := &OptimizationContext{
+		FilePath:      "/models/training_model.pth",
+		FileSize:      50 * 1024 * 1024, // 50MB
+		FileType:      "model",
+		AccessPattern: SequentialAccess,
+		Framework:     "pytorch",
+		WorkloadType:  "training",
+	}
+
+	// Apply optimization multiple times to build usage patterns
+	for i := 0; i < 5; i++ {
+		result := engine.OptimizeAccess(context)
+		if result == nil {
+			t.Fatalf("Optimization %d failed", i+1)
+		}
+	}
+
+	// Check that usage patterns are being tracked
+	if len(engine.usagePatterns) == 0 {
+		t.Error("Should have learned usage patterns")
+	}
+
+	// Verify pattern characteristics
+	for patternKey, pattern := range engine.usagePatterns {
+		t.Logf("Learned pattern: %s (frequency=%d, success_rate=%.2f)",
+			patternKey, pattern.Frequency, pattern.SuccessRate)
+
+		if pattern.Frequency < 1 {
+			t.Errorf("Pattern %s should have frequency >= 1", patternKey)
+		}
+	}
+}
+
+// TestOptimizationEngine_Metrics tests metrics collection
+func TestOptimizationEngine_Metrics(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	metrics := engine.GetMetrics()
+
+	if metrics == nil {
+		t.Fatal("Should return metrics")
+	}
+
+	expectedKeys := []string{"enabled", "rules_count", "templates_count", "strategies_count"}
+
+	for _, key := range expectedKeys {
+		if _, exists := metrics[key]; !exists {
+			t.Errorf("Metrics should contain key: %s", key)
+		}
+	}
+
+	if metrics["enabled"] != true {
+		t.Error("Metrics should show engine as enabled")
+	}
+
+	t.Logf("Engine metrics: %+v", metrics)
+}
+
+// TestOptimizationEngine_ConfigurationDriven tests configuration-driven optimization
+func TestOptimizationEngine_ConfigurationDriven(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+	defer engine.Shutdown()
+
+	// Test that the engine can apply optimizations based on its loaded configuration
+	context := &OptimizationContext{
+		FilePath:      "/data/dataset.csv",
+		FileSize:      10 * 1024 * 1024, // 10MB
+		FileType:      "dataset",
+		AccessPattern: SequentialAccess,
+		Framework:     "",
+		WorkloadType:  "training",
+		BatchSize:     32,
+	}
+
+	result := engine.OptimizeAccess(context)
+
+	if result == nil {
+		t.Fatal("Should return optimization result")
+	}
+
+	// The engine should make intelligent decisions based on context
+	if result.Applied && len(result.Optimizations) > 0 {
+		t.Logf("Successfully applied %d optimizations", len(result.Optimizations))
+
+		for _, opt := range result.Optimizations {
+			if opt.Type == "" || opt.Target == "" {
+				t.Error("Optimization should have valid type and target")
+			}
+		}
+	}
+
+	if len(result.Recommendations) > 0 {
+		t.Logf("Generated %d recommendations", len(result.Recommendations))
+		for _, rec := range result.Recommendations {
+			t.Logf("Recommendation: %s", rec)
+		}
+	}
+}
+
+// TestOptimizationEngine_Shutdown tests proper shutdown
+func TestOptimizationEngine_Shutdown(t *testing.T) {
+	engine := NewOptimizationEngine(true)
+
+	if !engine.enabled {
+		t.Error("Engine should start enabled")
+	}
+
+	engine.Shutdown()
+
+	if engine.enabled {
+		t.Error("Engine should be disabled after shutdown")
+	}
+
+	// Test that optimization doesn't work after shutdown
+	context := &OptimizationContext{
+		FilePath: "/test.pth",
+		FileSize: 1024,
+	}
+
+	result := engine.OptimizeAccess(context)
+	if result.Applied {
+		t.Error("Should not apply optimizations after shutdown")
+	}
+}
diff --git a/weed/mount/ml/phase4_integration_test.go b/weed/mount/ml/phase4_integration_test.go
index af0f7231a..88e618ada 100644
--- a/weed/mount/ml/phase4_integration_test.go
+++ b/weed/mount/ml/phase4_integration_test.go
@@ -9,15 +9,23 @@ import (
 
 // MockChunkCache for testing
 type MockChunkCache struct{}
+
 func (m *MockChunkCache) HasChunk(fileId string, chunkOffset int64) bool { return false }
-func (m *MockChunkCache) IsInCache(fileId string, forRead bool) bool { return false }
-func (m *MockChunkCache) ReadChunk(fileId string, chunkOffset int64, buffer []byte) (int, error) { return 0, nil }
-func (m *MockChunkCache) ReadChunkAt(buffer []byte, fileId string, offset uint64) (int, error) { return 0, nil }
-func (m *MockChunkCache) WriteChunk(fileId string, chunkOffset int64, buffer []byte) error { return nil }
-func (m *MockChunkCache) DeleteFileChunks(fileId string) {}
-func (m *MockChunkCache) GetMetrics() interface{} { return struct{}{} } // Return empty struct
-func (m *MockChunkCache) GetMaxFilePartSizeInCache() uint64 { return 64 * 1024 * 1024 } // 64MB default
-func (m *MockChunkCache) Shutdown() {}
+func (m *MockChunkCache) IsInCache(fileId string, forRead bool) bool     { return false }
+func (m *MockChunkCache) ReadChunk(fileId string, chunkOffset int64, buffer []byte) (int, error) {
+	return 0, nil
+}
+func (m *MockChunkCache) ReadChunkAt(buffer []byte, fileId string, offset uint64) (int, error) {
+	return 0, nil
+}
+func (m *MockChunkCache) WriteChunk(fileId string, chunkOffset int64, buffer []byte) error {
+	return nil
+}
+func (m *MockChunkCache) SetChunk(fileId string, buffer []byte) {}
+func (m *MockChunkCache) DeleteFileChunks(fileId string)        {}
+func (m *MockChunkCache) GetMetrics() interface{}               { return struct{}{} }       // Return empty struct
+func (m *MockChunkCache) GetMaxFilePartSizeInCache() uint64     { return 64 * 1024 * 1024 } // 64MB default
+func (m *MockChunkCache) Shutdown()                             {}
 
 // MockLookupFileId for testing
 func MockLookupFileId(ctx context.Context, fileId string) (targetUrls []string, err error) {
@@ -79,9 +87,9 @@ func TestPhase4_GPUMemoryCoordinator_Basic(t *testing.T) {
 	if coordinator == nil {
 		t.Fatal("Should create GPU coordinator")
 	}
-	
+
 	t.Log("GPU coordinator created successfully (detailed GPU operations would require actual GPU hardware)")
-	
+
 	// Test that it doesn't crash on basic operations
 	t.Logf("GPU coordinator basic functionality verified")
 
@@ -117,9 +125,9 @@ func TestPhase4_ServingOptimizer_Basic(t *testing.T) {
 
 	// Test model registration (basic structure)
 	modelInfo := &ModelServingInfo{
-		ModelID:       "resnet50-v1",
-		ModelPath:     "/models/resnet50.pth",
-		Framework:     "pytorch",
+		ModelID:        "resnet50-v1",
+		ModelPath:      "/models/resnet50.pth",
+		Framework:      "pytorch",
 		ServingPattern: ServingPatternRealtimeInference,
 	}
 
@@ -158,19 +166,19 @@ func TestPhase4_TensorOptimizer_Basic(t *testing.T) {
 func TestPhase4_MLOptimization_AdvancedIntegration(t *testing.T) {
 	// Create ML configuration with all Phase 4 features enabled
 	config := &MLConfig{
-		PrefetchWorkers:           8,
-		PrefetchQueueSize:         100,
-		PrefetchTimeout:          30 * time.Second,
-		EnableMLHeuristics:       true,
-		SequentialThreshold:      3,
-		ConfidenceThreshold:     0.6,
-		MaxPrefetchAhead:        8,
-		PrefetchBatchSize:       3,
+		PrefetchWorkers:            8,
+		PrefetchQueueSize:          100,
+		PrefetchTimeout:            30 * time.Second,
+		EnableMLHeuristics:         true,
+		SequentialThreshold:        3,
+		ConfidenceThreshold:        0.6,
+		MaxPrefetchAhead:           8,
+		PrefetchBatchSize:          3,
 		EnableWorkloadCoordination: true,
-		EnableGPUCoordination:     true,
-		EnableDistributedTraining: true,
-		EnableModelServing:        true,
-		EnableTensorOptimization:  true,
+		EnableGPUCoordination:      true,
+		EnableDistributedTraining:  true,
+		EnableModelServing:         true,
+		EnableTensorOptimization:   true,
 	}
 
 	mockChunkCache := &MockChunkCache{}
@@ -203,9 +211,9 @@ func TestPhase4_MLOptimization_AdvancedIntegration(t *testing.T) {
 
 	// Register model for serving optimization
 	modelInfo := &ModelServingInfo{
-		ModelID:       "bert-large",
-		ModelPath:     "/models/bert-large.bin",
-		Framework:     "transformers",
+		ModelID:        "bert-large",
+		ModelPath:      "/models/bert-large.bin",
+		Framework:      "transformers",
 		ServingPattern: ServingPatternRealtimeInference,
 	}
 	mlOpt.ServingOptimizer.RegisterModel(modelInfo)
@@ -255,7 +263,7 @@ func TestPhase4_ConcurrentOperations(t *testing.T) {
 		}(i)
 	}
 
-	// Concurrent GPU coordination operations  
+	// Concurrent GPU coordination operations
 	for i := 0; i < numConcurrentOps; i++ {
 		go func(index int) {
 			defer wg.Done()
@@ -283,9 +291,9 @@ func TestPhase4_ConcurrentOperations(t *testing.T) {
 		go func(index int) {
 			defer wg.Done()
 			modelInfo := &ModelServingInfo{
-				ModelID:       "concurrent-model-" + string(rune('0'+index)),
-				ModelPath:     "/models/model-" + string(rune('0'+index)) + ".bin",
-				Framework:     "pytorch",
+				ModelID:        "concurrent-model-" + string(rune('0'+index)),
+				ModelPath:      "/models/model-" + string(rune('0'+index)) + ".bin",
+				Framework:      "pytorch",
 				ServingPattern: ServingPatternRealtimeInference,
 			}
 			mlOpt.ServingOptimizer.RegisterModel(modelInfo)
@@ -324,7 +332,7 @@ func TestPhase4_ConcurrentOperations(t *testing.T) {
 func TestPhase4_PerformanceImpact(t *testing.T) {
 	// Test with Phase 4 features disabled
 	configBasic := DefaultMLConfig()
-	
+
 	mockChunkCache := &MockChunkCache{}
 	startTime := time.Now()
 	mlOptBasic := NewMLOptimization(configBasic, mockChunkCache, MockLookupFileId)
@@ -346,7 +354,7 @@ func TestPhase4_PerformanceImpact(t *testing.T) {
 
 	// Performance impact should be reasonable (less than 10x slower)
 	performanceRatio := float64(advancedInitTime) / float64(basicInitTime)
-	t.Logf("Basic init time: %v, Advanced init time: %v, Ratio: %.2f", 
+	t.Logf("Basic init time: %v, Advanced init time: %v, Ratio: %.2f",
 		basicInitTime, advancedInitTime, performanceRatio)
 
 	if performanceRatio > 10.0 {
@@ -357,7 +365,7 @@ func TestPhase4_PerformanceImpact(t *testing.T) {
 	basicMemory := estimateMemoryUsage(mlOptBasic)
 	advancedMemory := estimateMemoryUsage(mlOptAdvanced)
 	memoryRatio := float64(advancedMemory) / float64(basicMemory)
-	
+
 	t.Logf("Basic memory: %d bytes, Advanced memory: %d bytes, Ratio: %.2f",
 		basicMemory, advancedMemory, memoryRatio)
 
@@ -371,7 +379,7 @@ func TestPhase4_PerformanceImpact(t *testing.T) {
 // Helper function to estimate memory usage (simplified)
 func estimateMemoryUsage(mlOpt *MLOptimization) int64 {
 	baseSize := int64(1024 * 1024) // 1MB base
-	
+
 	if mlOpt.WorkloadCoordinator != nil {
 		baseSize += 512 * 1024 // 512KB
 	}
@@ -387,7 +395,7 @@ func estimateMemoryUsage(mlOpt *MLOptimization) int64 {
 	if mlOpt.TensorOptimizer != nil {
 		baseSize += 256 * 1024 // 256KB
 	}
-	
+
 	return baseSize
 }
 
@@ -433,9 +441,9 @@ func TestPhase4_ShutdownSequence(t *testing.T) {
 	mlOpt := NewMLOptimization(config, mockChunkCache, MockLookupFileId)
 
 	// Verify all components are running
-	if mlOpt.WorkloadCoordinator == nil || mlOpt.GPUCoordinator == nil || 
-	   mlOpt.DistributedCoordinator == nil || mlOpt.ServingOptimizer == nil ||
-	   mlOpt.TensorOptimizer == nil {
+	if mlOpt.WorkloadCoordinator == nil || mlOpt.GPUCoordinator == nil ||
+		mlOpt.DistributedCoordinator == nil || mlOpt.ServingOptimizer == nil ||
+		mlOpt.TensorOptimizer == nil {
 		t.Fatal("Not all Phase 4 components initialized")
 	}