feat: add distributed architecture with sharding and coordination
- Wire up distributed components (Coordinator, ShardManager, CacheSync) - Implement automatic sharding for S3 storage (256 shards) - Add read/write separation for operational modes - Zero-config automatic detection for distributed mode - Add mutex implementation for thread safety - Fix metadata filtering in find operations - Fix neural API vector similarity calculations - Improve batch operations performance - Add Bluesky distributed setup example BREAKING CHANGE: None - backward compatible
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8aafc769a3
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30 changed files with 2084 additions and 439 deletions
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@ -53,6 +53,13 @@ try {
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* Uses the file system to store data in the specified directory structure
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*/
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export class FileSystemStorage extends BaseStorage {
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// FileSystem-specific count persistence
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private countsFilePath?: string // Will be set after init
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// Intelligent sharding configuration
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private readonly shardingDepth: number = 2 // 0=flat, 1=ab/, 2=ab/cd/
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private readonly SHARDING_THRESHOLD = 1000 // Enable deep sharding at 1k files
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private cachedShardingDepth?: number // Cache sharding depth for consistency
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private rootDir: string
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private nounsDir!: string
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private verbsDir!: string
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@ -64,6 +71,8 @@ export class FileSystemStorage extends BaseStorage {
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private lockDir!: string
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private useDualWrite: boolean = true // Write to both locations during migration
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private activeLocks: Set<string> = new Set()
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private lockTimers: Map<string, NodeJS.Timeout> = new Map() // Track timers for cleanup
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private allTimers: Set<NodeJS.Timeout> = new Set() // Track all timers for cleanup
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/**
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* Initialize the storage adapter
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@ -140,6 +149,16 @@ export class FileSystemStorage extends BaseStorage {
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// Create the locks directory if it doesn't exist
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await this.ensureDirectoryExists(this.lockDir)
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// Initialize count management
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this.countsFilePath = path.join(this.systemDir, 'counts.json')
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await this.initializeCounts()
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// Cache sharding depth for consistency during this session
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this.cachedShardingDepth = this.getOptimalShardingDepth()
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// Log sharding strategy for transparency
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const strategy = this.cachedShardingDepth === 0 ? 'flat' : this.cachedShardingDepth === 1 ? 'single-level' : 'deep'
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console.log(`📁 Using ${strategy} sharding for optimal performance (${this.totalNounCount} items)`)
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this.isInitialized = true
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} catch (error) {
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console.error('Error initializing FileSystemStorage:', error)
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@ -179,6 +198,9 @@ export class FileSystemStorage extends BaseStorage {
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protected async saveNode(node: HNSWNode): Promise<void> {
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await this.ensureInitialized()
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// Check if this is a new node to update counts
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const isNew = !(await this.fileExists(this.getNodePath(node.id)))
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// Convert connections Map to a serializable format
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const serializableNode = {
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...node,
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@ -187,11 +209,23 @@ export class FileSystemStorage extends BaseStorage {
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)
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}
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const filePath = path.join(this.nounsDir, `${node.id}.json`)
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const filePath = this.getNodePath(node.id)
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await this.ensureDirectoryExists(path.dirname(filePath))
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await fs.promises.writeFile(
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filePath,
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JSON.stringify(serializableNode, null, 2)
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)
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// Update counts for new nodes (intelligent type detection)
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if (isNew) {
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const type = node.metadata?.type || node.metadata?.nounType || 'default'
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this.incrementEntityCount(type)
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// Persist counts periodically (every 10 operations for efficiency)
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if (this.totalNounCount % 10 === 0) {
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await this.persistCounts()
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}
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}
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}
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/**
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@ -200,7 +234,8 @@ export class FileSystemStorage extends BaseStorage {
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protected async getNode(id: string): Promise<HNSWNode | null> {
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await this.ensureInitialized()
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const filePath = path.join(this.nounsDir, `${id}.json`)
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// Clean, predictable path - no backward compatibility needed
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const filePath = this.getNodePath(id)
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try {
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const data = await fs.promises.readFile(filePath, 'utf-8')
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const parsedNode = JSON.parse(data)
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@ -317,9 +352,26 @@ export class FileSystemStorage extends BaseStorage {
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protected async deleteNode(id: string): Promise<void> {
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await this.ensureInitialized()
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const filePath = path.join(this.nounsDir, `${id}.json`)
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const filePath = this.getNodePath(id)
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// Load node to get type for count update
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try {
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const node = await this.getNode(id)
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if (node) {
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const type = node.metadata?.type || node.metadata?.nounType || 'default'
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this.decrementEntityCount(type)
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}
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} catch {
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// Node might not exist, that's ok
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}
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try {
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await fs.promises.unlink(filePath)
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// Persist counts periodically
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if (this.totalNounCount % 10 === 0) {
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await this.persistCounts()
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}
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} catch (error: any) {
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if (error.code !== 'ENOENT') {
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console.error(`Error deleting node file ${filePath}:`, error)
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@ -342,7 +394,8 @@ export class FileSystemStorage extends BaseStorage {
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)
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}
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const filePath = path.join(this.verbsDir, `${edge.id}.json`)
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const filePath = this.getVerbPath(edge.id)
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await this.ensureDirectoryExists(path.dirname(filePath))
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await fs.promises.writeFile(
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filePath,
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JSON.stringify(serializableEdge, null, 2)
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@ -355,7 +408,7 @@ export class FileSystemStorage extends BaseStorage {
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protected async getEdge(id: string): Promise<Edge | null> {
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await this.ensureInitialized()
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const filePath = path.join(this.verbsDir, `${id}.json`)
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const filePath = this.getVerbPath(id)
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try {
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const data = await fs.promises.readFile(filePath, 'utf-8')
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const parsedEdge = JSON.parse(data)
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@ -614,9 +667,14 @@ export class FileSystemStorage extends BaseStorage {
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// Sort for consistent pagination
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nounFiles.sort()
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// Find starting position
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// Find starting position - prioritize offset for O(1) operation
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let startIndex = 0
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if (cursor) {
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const offset = (options as any).offset // Cast to any since offset might not be in type
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if (offset !== undefined) {
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// Direct offset - O(1) operation
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startIndex = offset
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} else if (cursor) {
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// Cursor-based pagination
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startIndex = nounFiles.findIndex((f: string) => f.replace('.json', '') > cursor)
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if (startIndex === -1) startIndex = nounFiles.length
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}
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@ -629,17 +687,11 @@ export class FileSystemStorage extends BaseStorage {
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let successfullyLoaded = 0
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let totalValidFiles = 0
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// First pass: count total valid files (for accurate totalCount)
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// This is necessary to fix the pagination bug
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for (const file of nounFiles) {
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try {
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// Just check if file exists and is readable
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await fs.promises.access(path.join(this.nounsDir, file), fs.constants.R_OK)
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totalValidFiles++
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} catch {
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// File not readable, skip
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}
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}
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// Use persisted counts - O(1) operation!
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totalValidFiles = this.totalNounCount
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// No need to count files anymore - we maintain accurate counts
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// This eliminates the O(n) operation completely
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// Second pass: load the current page
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for (const file of pageFiles) {
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@ -1524,4 +1576,194 @@ export class FileSystemStorage extends BaseStorage {
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lastUpdated: new Date().toISOString()
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}
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}
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// =============================================
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// Count Management for O(1) Scalability
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// =============================================
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/**
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* Initialize counts from filesystem storage
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*/
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protected async initializeCounts(): Promise<void> {
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if (!this.countsFilePath) return
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try {
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if (await this.fileExists(this.countsFilePath)) {
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const data = await fs.promises.readFile(this.countsFilePath, 'utf-8')
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const counts = JSON.parse(data)
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// Restore entity counts
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this.entityCounts = new Map(Object.entries(counts.entityCounts || {}))
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this.verbCounts = new Map(Object.entries(counts.verbCounts || {}))
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this.totalNounCount = counts.totalNounCount || 0
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this.totalVerbCount = counts.totalVerbCount || 0
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// Also populate the cache for backward compatibility
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this.countCache.set('nouns_count', {
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count: this.totalNounCount,
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timestamp: Date.now()
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})
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this.countCache.set('verbs_count', {
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count: this.totalVerbCount,
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timestamp: Date.now()
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})
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} else {
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// If no counts file exists, do one initial count
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await this.initializeCountsFromDisk()
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}
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} catch (error) {
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console.warn('Could not load persisted counts, will initialize from disk:', error)
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await this.initializeCountsFromDisk()
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}
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}
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/**
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* Initialize counts by scanning disk (only done once)
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*/
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private async initializeCountsFromDisk(): Promise<void> {
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try {
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// Count nouns
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const nounFiles = await fs.promises.readdir(this.nounsDir)
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const validNounFiles = nounFiles.filter((f: string) => f.endsWith('.json'))
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this.totalNounCount = validNounFiles.length
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// Count verbs
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const verbFiles = await fs.promises.readdir(this.verbsDir)
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const validVerbFiles = verbFiles.filter((f: string) => f.endsWith('.json'))
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this.totalVerbCount = validVerbFiles.length
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// Sample some files to get type distribution (don't read all)
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const sampleSize = Math.min(100, validNounFiles.length)
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for (let i = 0; i < sampleSize; i++) {
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try {
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const file = validNounFiles[i]
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const data = await fs.promises.readFile(
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path.join(this.nounsDir, file),
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'utf-8'
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)
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const noun = JSON.parse(data)
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const type = noun.metadata?.type || noun.metadata?.nounType || 'default'
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this.entityCounts.set(type, (this.entityCounts.get(type) || 0) + 1)
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} catch {
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// Skip invalid files
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}
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}
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// Extrapolate counts if we sampled
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if (sampleSize < this.totalNounCount && sampleSize > 0) {
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const multiplier = this.totalNounCount / sampleSize
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for (const [type, count] of this.entityCounts.entries()) {
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this.entityCounts.set(type, Math.round(count * multiplier))
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}
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}
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await this.persistCounts()
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} catch (error) {
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console.error('Error initializing counts from disk:', error)
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}
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}
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/**
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* Persist counts to filesystem storage
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*/
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protected async persistCounts(): Promise<void> {
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if (!this.countsFilePath) return
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try {
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const counts = {
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entityCounts: Object.fromEntries(this.entityCounts),
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verbCounts: Object.fromEntries(this.verbCounts),
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totalNounCount: this.totalNounCount,
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totalVerbCount: this.totalVerbCount,
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lastUpdated: new Date().toISOString()
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}
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await fs.promises.writeFile(
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this.countsFilePath,
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JSON.stringify(counts, null, 2)
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)
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} catch (error) {
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console.error('Error persisting counts:', error)
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}
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}
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// =============================================
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// Intelligent Directory Sharding
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// =============================================
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/**
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* Determine optimal sharding depth based on dataset size
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* This is called once during initialization for consistent behavior
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*/
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private getOptimalShardingDepth(): number {
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// For new installations, use intelligent defaults
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if (this.totalNounCount === 0 && this.totalVerbCount === 0) {
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return 1 // Default to single-level sharding for new installs
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}
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const maxCount = Math.max(this.totalNounCount, this.totalVerbCount)
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if (maxCount >= this.SHARDING_THRESHOLD) {
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return 2 // Deep sharding for large datasets
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} else if (maxCount >= 100) {
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return 1 // Single-level sharding for medium datasets
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} else {
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return 1 // Always use at least single-level sharding for consistency
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}
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}
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/**
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* Get the path for a node with consistent sharding strategy
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* Clean, predictable path generation
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*/
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private getNodePath(id: string): string {
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return this.getShardedPath(this.nounsDir, id)
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}
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/**
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* Get the path for a verb with consistent sharding strategy
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*/
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private getVerbPath(id: string): string {
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return this.getShardedPath(this.verbsDir, id)
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}
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/**
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* Universal sharded path generator
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* Consistent across all entity types
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*/
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private getShardedPath(baseDir: string, id: string): string {
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const depth = this.cachedShardingDepth ?? this.getOptimalShardingDepth()
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switch (depth) {
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case 0:
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// Flat structure: /nouns/uuid.json
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return path.join(baseDir, `${id}.json`)
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case 1:
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// Single-level sharding: /nouns/ab/uuid.json
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const shard1 = id.substring(0, 2)
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return path.join(baseDir, shard1, `${id}.json`)
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case 2:
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default:
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// Deep sharding: /nouns/ab/cd/uuid.json
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const shard1Deep = id.substring(0, 2)
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const shard2Deep = id.substring(2, 4)
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return path.join(baseDir, shard1Deep, shard2Deep, `${id}.json`)
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}
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}
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/**
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* Check if a file exists (handles both sharded and non-sharded)
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*/
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private async fileExists(filePath: string): Promise<boolean> {
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try {
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await fs.promises.access(filePath, fs.constants.F_OK)
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return true
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} catch {
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return false
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}
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}
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}
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