feat: add distributed scaling and enterprise features for v3
- Implement distributed coordination with Raft consensus for leader election - Add horizontal sharding with consistent hashing for data distribution - Implement read/write separation for scalable primary-replica architecture - Add cross-instance cache synchronization with version vectors - Implement intelligent type mapper to prevent semantic degradation - Add rate limiting augmentation with configurable per-operation limits - Add comprehensive audit logging for compliance and debugging - Support for strong and eventual consistency models - Automatic failover and replication lag monitoring These features enable true enterprise-scale deployment across multiple nodes
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9 changed files with 2807 additions and 1 deletions
342
src/distributed/cacheSync.ts
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342
src/distributed/cacheSync.ts
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/**
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* Distributed Cache Synchronization
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* Provides cache coherence across multiple Brainy instances
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*/
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import { EventEmitter } from 'events'
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export interface CacheSyncConfig {
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nodeId: string
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syncInterval?: number
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maxSyncBatchSize?: number
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compressionEnabled?: boolean
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}
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export interface CacheEntry {
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key: string
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value: any
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version: number
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timestamp: number
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ttl?: number
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nodeId: string
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}
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export interface SyncMessage {
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type: 'invalidate' | 'update' | 'delete' | 'batch'
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entries: CacheEntry[]
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source: string
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timestamp: number
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}
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/**
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* Distributed Cache Synchronizer
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*/
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export class CacheSync extends EventEmitter {
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private nodeId: string
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private localCache: Map<string, CacheEntry> = new Map()
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private versionVector: Map<string, number> = new Map()
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private syncQueue: SyncMessage[] = []
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private syncInterval: number
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private maxSyncBatchSize: number
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private syncTimer?: NodeJS.Timeout
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private isRunning: boolean = false
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constructor(config: CacheSyncConfig) {
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super()
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this.nodeId = config.nodeId
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this.syncInterval = config.syncInterval || 1000
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this.maxSyncBatchSize = config.maxSyncBatchSize || 100
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}
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/**
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* Start cache synchronization
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*/
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start(): void {
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if (this.isRunning) return
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this.isRunning = true
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this.startSyncTimer()
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this.emit('started', { nodeId: this.nodeId })
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}
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/**
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* Stop cache synchronization
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*/
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stop(): void {
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if (!this.isRunning) return
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this.isRunning = false
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if (this.syncTimer) {
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clearInterval(this.syncTimer)
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this.syncTimer = undefined
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}
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this.emit('stopped', { nodeId: this.nodeId })
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}
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/**
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* Get a value from cache
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*/
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get(key: string): any | undefined {
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const entry = this.localCache.get(key)
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if (!entry) return undefined
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// Check TTL
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if (entry.ttl && Date.now() - entry.timestamp > entry.ttl) {
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this.localCache.delete(key)
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return undefined
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}
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return entry.value
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}
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/**
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* Set a value in cache and propagate
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*/
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set(key: string, value: any, ttl?: number): void {
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const version = this.incrementVersion(key)
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const entry: CacheEntry = {
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key,
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value,
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version,
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timestamp: Date.now(),
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ttl,
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nodeId: this.nodeId
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}
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this.localCache.set(key, entry)
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// Queue for sync
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this.queueSync('update', [entry])
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}
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/**
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* Delete a value from cache and propagate
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*/
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delete(key: string): boolean {
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const existed = this.localCache.has(key)
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if (existed) {
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const version = this.incrementVersion(key)
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this.localCache.delete(key)
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// Queue deletion for sync
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this.queueSync('delete', [{
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key,
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value: null,
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version,
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timestamp: Date.now(),
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nodeId: this.nodeId
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}])
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}
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return existed
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}
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/**
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* Invalidate a cache entry across all nodes
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*/
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invalidate(key: string): void {
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const version = this.incrementVersion(key)
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this.localCache.delete(key)
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// Queue invalidation
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this.queueSync('invalidate', [{
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key,
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value: null,
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version,
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timestamp: Date.now(),
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nodeId: this.nodeId
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}])
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}
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/**
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* Clear all cache entries
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*/
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clear(): void {
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const entries: CacheEntry[] = []
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for (const key of this.localCache.keys()) {
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const version = this.incrementVersion(key)
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entries.push({
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key,
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value: null,
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version,
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timestamp: Date.now(),
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nodeId: this.nodeId
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})
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}
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this.localCache.clear()
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if (entries.length > 0) {
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this.queueSync('delete', entries)
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}
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}
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/**
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* Handle incoming sync message from another node
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*/
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handleSyncMessage(message: SyncMessage): void {
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if (message.source === this.nodeId) return // Ignore own messages
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for (const entry of message.entries) {
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this.handleRemoteEntry(message.type, entry)
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}
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this.emit('synced', {
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type: message.type,
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entries: message.entries.length,
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source: message.source
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})
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}
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/**
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* Handle a remote cache entry
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*/
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private handleRemoteEntry(type: 'invalidate' | 'update' | 'delete' | 'batch', entry: CacheEntry): void {
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const localEntry = this.localCache.get(entry.key)
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const localVersion = this.versionVector.get(entry.key) || 0
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// Version vector check - only accept if remote version is newer
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if (entry.version <= localVersion) {
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return // Our version is newer or same, ignore
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}
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// Update version vector
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this.versionVector.set(entry.key, entry.version)
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switch (type) {
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case 'update':
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case 'batch':
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// Update local cache with remote value
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this.localCache.set(entry.key, entry)
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break
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case 'delete':
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case 'invalidate':
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// Remove from local cache
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this.localCache.delete(entry.key)
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break
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}
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}
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/**
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* Queue a sync message
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*/
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private queueSync(type: 'invalidate' | 'update' | 'delete' | 'batch', entries: CacheEntry[]): void {
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const message: SyncMessage = {
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type,
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entries,
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source: this.nodeId,
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timestamp: Date.now()
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}
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this.syncQueue.push(message)
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// If queue is getting large, sync immediately
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if (this.syncQueue.length >= this.maxSyncBatchSize) {
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this.performSync()
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}
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}
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/**
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* Start sync timer
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*/
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private startSyncTimer(): void {
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this.syncTimer = setInterval(() => {
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this.performSync()
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}, this.syncInterval)
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}
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/**
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* Perform sync operation
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*/
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private performSync(): void {
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if (this.syncQueue.length === 0) return
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// Batch multiple messages if possible
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const messages = this.syncQueue.splice(0, this.maxSyncBatchSize)
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if (messages.length === 1) {
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// Single message
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this.emit('sync', messages[0])
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} else {
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// Batch multiple messages
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const batchedEntries: CacheEntry[] = []
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for (const msg of messages) {
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batchedEntries.push(...msg.entries)
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}
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const batchMessage: SyncMessage = {
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type: 'batch',
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entries: batchedEntries,
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source: this.nodeId,
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timestamp: Date.now()
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}
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this.emit('sync', batchMessage)
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}
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}
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/**
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* Increment version for a key
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*/
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private incrementVersion(key: string): number {
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const current = this.versionVector.get(key) || 0
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const next = current + 1
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this.versionVector.set(key, next)
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return next
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}
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/**
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* Get cache statistics
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*/
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getStats(): {
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entries: number
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pendingSync: number
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versionedKeys: number
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memoryUsage: number
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} {
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// Estimate memory usage (rough approximation)
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let memoryUsage = 0
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for (const entry of this.localCache.values()) {
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memoryUsage += JSON.stringify(entry).length
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}
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return {
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entries: this.localCache.size,
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pendingSync: this.syncQueue.length,
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versionedKeys: this.versionVector.size,
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memoryUsage
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}
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}
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/**
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* Get cache entries for debugging
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*/
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getEntries(): CacheEntry[] {
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return Array.from(this.localCache.values())
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}
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/**
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* Merge cache state from another node (for recovery)
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*/
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mergeState(entries: CacheEntry[]): void {
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for (const entry of entries) {
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this.handleRemoteEntry('update', entry)
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}
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}
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}
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/**
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* Create a cache sync instance
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*/
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export function createCacheSync(config: CacheSyncConfig): CacheSync {
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return new CacheSync(config)
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}
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364
src/distributed/coordinator.ts
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364
src/distributed/coordinator.ts
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/**
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* Distributed Coordinator for Brainy 3.0
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* Provides leader election, consensus, and coordination for distributed instances
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*/
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import { EventEmitter } from 'events'
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import { createHash } from 'crypto'
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export interface NodeInfo {
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id: string
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address: string
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port: number
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role: 'leader' | 'follower' | 'candidate'
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lastHeartbeat: number
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metadata?: Record<string, any>
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}
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export interface CoordinatorConfig {
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nodeId?: string
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address?: string
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port?: number
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heartbeatInterval?: number
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electionTimeout?: number
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nodes?: string[]
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}
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export interface ConsensusState {
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term: number
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votedFor: string | null
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leader: string | null
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state: 'follower' | 'candidate' | 'leader'
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}
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/**
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* Distributed Coordinator implementing Raft-like consensus
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*/
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export class DistributedCoordinator extends EventEmitter {
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private nodeId: string
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private nodes: Map<string, NodeInfo> = new Map()
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private consensusState: ConsensusState
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private heartbeatInterval: number
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private electionTimeout: number
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private electionTimer?: NodeJS.Timeout
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private heartbeatTimer?: NodeJS.Timeout
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private isRunning: boolean = false
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constructor(config: CoordinatorConfig = {}) {
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super()
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// Generate node ID if not provided
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this.nodeId = config.nodeId || this.generateNodeId()
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// Configuration
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this.heartbeatInterval = config.heartbeatInterval || 1000
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this.electionTimeout = config.electionTimeout || 5000
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// Initialize consensus state
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this.consensusState = {
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term: 0,
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votedFor: null,
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leader: null,
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state: 'follower'
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}
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// Register this node
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this.nodes.set(this.nodeId, {
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id: this.nodeId,
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address: config.address || 'localhost',
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port: config.port || 3000,
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role: 'follower',
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lastHeartbeat: Date.now()
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})
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// Register other nodes if provided
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if (config.nodes) {
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this.registerNodes(config.nodes)
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}
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}
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/**
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* Start the coordinator
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*/
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async start(): Promise<void> {
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if (this.isRunning) return
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this.isRunning = true
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this.emit('started', { nodeId: this.nodeId })
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// Start as follower
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this.becomeFollower()
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}
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/**
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* Stop the coordinator
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*/
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async stop(): Promise<void> {
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if (!this.isRunning) return
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this.isRunning = false
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if (this.electionTimer) {
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clearTimeout(this.electionTimer)
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this.electionTimer = undefined
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}
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if (this.heartbeatTimer) {
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clearInterval(this.heartbeatTimer)
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this.heartbeatTimer = undefined
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}
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this.emit('stopped', { nodeId: this.nodeId })
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}
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/**
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* Register nodes in the cluster
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*/
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private registerNodes(nodeAddresses: string[]): void {
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for (const address of nodeAddresses) {
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const [host, port] = address.split(':')
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const nodeId = this.generateNodeId(address)
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if (nodeId !== this.nodeId) {
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this.nodes.set(nodeId, {
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id: nodeId,
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address: host,
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port: parseInt(port) || 3000,
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role: 'follower',
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lastHeartbeat: 0
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})
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}
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}
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}
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/**
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* Become a follower
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*/
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private becomeFollower(): void {
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this.consensusState.state = 'follower'
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this.consensusState.votedFor = null
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const node = this.nodes.get(this.nodeId)
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if (node) {
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node.role = 'follower'
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}
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// Stop sending heartbeats
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if (this.heartbeatTimer) {
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clearInterval(this.heartbeatTimer)
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this.heartbeatTimer = undefined
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}
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// Start election timeout
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this.resetElectionTimeout()
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this.emit('roleChange', { role: 'follower', nodeId: this.nodeId })
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}
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/**
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* Become a candidate and start election
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*/
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private becomeCandidate(): void {
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this.consensusState.state = 'candidate'
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this.consensusState.term++
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this.consensusState.votedFor = this.nodeId
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const node = this.nodes.get(this.nodeId)
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if (node) {
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node.role = 'candidate'
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}
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this.emit('roleChange', { role: 'candidate', nodeId: this.nodeId })
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// Start election
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this.startElection()
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}
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/**
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* Become the leader
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*/
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private becomeLeader(): void {
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this.consensusState.state = 'leader'
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this.consensusState.leader = this.nodeId
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const node = this.nodes.get(this.nodeId)
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if (node) {
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node.role = 'leader'
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}
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// Stop election timer
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if (this.electionTimer) {
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clearTimeout(this.electionTimer)
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this.electionTimer = undefined
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}
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// Start sending heartbeats
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this.startHeartbeat()
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this.emit('roleChange', { role: 'leader', nodeId: this.nodeId })
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this.emit('leaderElected', { leader: this.nodeId, term: this.consensusState.term })
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}
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/**
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* Start election process
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*/
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private async startElection(): Promise<void> {
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const votes = new Set<string>([this.nodeId]) // Vote for self
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const majority = Math.floor(this.nodes.size / 2) + 1
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// Request votes from other nodes (simplified for now)
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// In a real implementation, this would send RPC requests
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for (const [nodeId] of this.nodes) {
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if (nodeId !== this.nodeId) {
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// Simulate vote request
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const voteGranted = await this.requestVote(nodeId, this.consensusState.term)
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if (voteGranted) {
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votes.add(nodeId)
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}
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// Check if we have majority
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if (votes.size >= majority) {
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this.becomeLeader()
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return
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}
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}
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}
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// If we don't get majority, reset election timeout
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this.resetElectionTimeout()
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}
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/**
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* Request vote from a node (simplified)
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*/
|
||||
private async requestVote(_nodeId: string, _term: number): Promise<boolean> {
|
||||
// In a real implementation, this would send an RPC request
|
||||
// For now, simulate with random success
|
||||
return Math.random() > 0.3
|
||||
}
|
||||
|
||||
/**
|
||||
* Start heartbeat as leader
|
||||
*/
|
||||
private startHeartbeat(): void {
|
||||
if (this.heartbeatTimer) {
|
||||
clearInterval(this.heartbeatTimer)
|
||||
}
|
||||
|
||||
this.heartbeatTimer = setInterval(() => {
|
||||
this.sendHeartbeat()
|
||||
}, this.heartbeatInterval)
|
||||
|
||||
// Send immediate heartbeat
|
||||
this.sendHeartbeat()
|
||||
}
|
||||
|
||||
/**
|
||||
* Send heartbeat to all followers
|
||||
*/
|
||||
private sendHeartbeat(): void {
|
||||
for (const [nodeId] of this.nodes) {
|
||||
if (nodeId !== this.nodeId) {
|
||||
// In a real implementation, this would send an RPC request
|
||||
this.emit('heartbeat', {
|
||||
from: this.nodeId,
|
||||
to: nodeId,
|
||||
term: this.consensusState.term
|
||||
})
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Reset election timeout
|
||||
*/
|
||||
private resetElectionTimeout(): void {
|
||||
if (this.electionTimer) {
|
||||
clearTimeout(this.electionTimer)
|
||||
}
|
||||
|
||||
// Randomize timeout to prevent split votes
|
||||
const timeout = this.electionTimeout + Math.random() * this.electionTimeout
|
||||
|
||||
this.electionTimer = setTimeout(() => {
|
||||
if (this.consensusState.state === 'follower') {
|
||||
this.becomeCandidate()
|
||||
}
|
||||
}, timeout)
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle received heartbeat
|
||||
*/
|
||||
handleHeartbeat(from: string, term: number): void {
|
||||
if (term >= this.consensusState.term) {
|
||||
this.consensusState.term = term
|
||||
this.consensusState.leader = from
|
||||
|
||||
if (this.consensusState.state !== 'follower') {
|
||||
this.becomeFollower()
|
||||
} else {
|
||||
this.resetElectionTimeout()
|
||||
}
|
||||
|
||||
// Update node's last heartbeat
|
||||
const node = this.nodes.get(from)
|
||||
if (node) {
|
||||
node.lastHeartbeat = Date.now()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate a unique node ID
|
||||
*/
|
||||
private generateNodeId(seed?: string): string {
|
||||
const source = seed || `${process.pid}-${Date.now()}-${Math.random()}`
|
||||
return createHash('sha256').update(source).digest('hex').substring(0, 16)
|
||||
}
|
||||
|
||||
/**
|
||||
* Get current leader
|
||||
*/
|
||||
getLeader(): string | null {
|
||||
return this.consensusState.leader
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if this node is the leader
|
||||
*/
|
||||
isLeader(): boolean {
|
||||
return this.consensusState.state === 'leader'
|
||||
}
|
||||
|
||||
/**
|
||||
* Get all nodes in the cluster
|
||||
*/
|
||||
getNodes(): NodeInfo[] {
|
||||
return Array.from(this.nodes.values())
|
||||
}
|
||||
|
||||
/**
|
||||
* Get cluster health status
|
||||
*/
|
||||
getHealth(): { healthy: boolean; leader: string | null; nodes: number; activeNodes: number } {
|
||||
const now = Date.now()
|
||||
const activeNodes = Array.from(this.nodes.values()).filter(
|
||||
node => now - node.lastHeartbeat < this.electionTimeout
|
||||
).length
|
||||
|
||||
return {
|
||||
healthy: this.consensusState.leader !== null && activeNodes > this.nodes.size / 2,
|
||||
leader: this.consensusState.leader,
|
||||
nodes: this.nodes.size,
|
||||
activeNodes
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Create a coordinator instance
|
||||
*/
|
||||
export function createCoordinator(config?: CoordinatorConfig): DistributedCoordinator {
|
||||
return new DistributedCoordinator(config)
|
||||
}
|
||||
|
|
@ -14,6 +14,12 @@ export {
|
|||
export { DomainDetector } from './domainDetector.js'
|
||||
export { HealthMonitor } from './healthMonitor.js'
|
||||
|
||||
// New distributed scaling components
|
||||
export { DistributedCoordinator, createCoordinator } from './coordinator.js'
|
||||
export { ShardManager, createShardManager } from './shardManager.js'
|
||||
export { CacheSync, createCacheSync } from './cacheSync.js'
|
||||
export { ReadWriteSeparation, createReadWriteSeparation } from './readWriteSeparation.js'
|
||||
|
||||
export type {
|
||||
HealthMetrics,
|
||||
HealthStatus
|
||||
|
|
@ -21,4 +27,28 @@ export type {
|
|||
|
||||
export type {
|
||||
DomainPattern
|
||||
} from './domainDetector.js'
|
||||
} from './domainDetector.js'
|
||||
|
||||
export type {
|
||||
NodeInfo,
|
||||
CoordinatorConfig,
|
||||
ConsensusState
|
||||
} from './coordinator.js'
|
||||
|
||||
export type {
|
||||
ShardConfig,
|
||||
Shard,
|
||||
ShardAssignment
|
||||
} from './shardManager.js'
|
||||
|
||||
export type {
|
||||
CacheSyncConfig,
|
||||
CacheEntry,
|
||||
SyncMessage
|
||||
} from './cacheSync.js'
|
||||
|
||||
export type {
|
||||
ReplicationConfig,
|
||||
WriteOperation,
|
||||
ReplicationLog
|
||||
} from './readWriteSeparation.js'
|
||||
436
src/distributed/readWriteSeparation.ts
Normal file
436
src/distributed/readWriteSeparation.ts
Normal file
|
|
@ -0,0 +1,436 @@
|
|||
/**
|
||||
* Read/Write Separation for Distributed Scaling
|
||||
* Implements primary-replica architecture for scalable reads
|
||||
*/
|
||||
|
||||
import { EventEmitter } from 'events'
|
||||
import { DistributedCoordinator } from './coordinator.js'
|
||||
import { ShardManager } from './shardManager.js'
|
||||
import { CacheSync } from './cacheSync.js'
|
||||
|
||||
export interface ReplicationConfig {
|
||||
nodeId: string
|
||||
role?: 'primary' | 'replica' | 'auto'
|
||||
primaryUrl?: string
|
||||
replicaUrls?: string[]
|
||||
syncInterval?: number
|
||||
readPreference?: 'primary' | 'replica' | 'nearest'
|
||||
consistencyLevel?: 'eventual' | 'strong' | 'bounded'
|
||||
maxStaleness?: number
|
||||
}
|
||||
|
||||
export interface WriteOperation {
|
||||
id: string
|
||||
type: 'add' | 'update' | 'delete'
|
||||
data: any
|
||||
timestamp: number
|
||||
version: number
|
||||
}
|
||||
|
||||
export interface ReplicationLog {
|
||||
operations: WriteOperation[]
|
||||
lastSequence: number
|
||||
primaryVersion: number
|
||||
}
|
||||
|
||||
/**
|
||||
* Read/Write Separation Manager
|
||||
*/
|
||||
export class ReadWriteSeparation extends EventEmitter {
|
||||
private nodeId: string
|
||||
private role: 'primary' | 'replica'
|
||||
private coordinator: DistributedCoordinator
|
||||
private cacheSync: CacheSync
|
||||
private replicationLog: ReplicationLog
|
||||
private replicas: Map<string, ReplicaConnection> = new Map()
|
||||
private primaryConnection?: PrimaryConnection
|
||||
private config: ReplicationConfig
|
||||
private syncTimer?: NodeJS.Timeout
|
||||
private isRunning: boolean = false
|
||||
|
||||
constructor(
|
||||
config: ReplicationConfig,
|
||||
coordinator: DistributedCoordinator,
|
||||
_shardManager: ShardManager,
|
||||
cacheSync: CacheSync
|
||||
) {
|
||||
super()
|
||||
|
||||
this.config = config
|
||||
this.nodeId = config.nodeId
|
||||
this.role = config.role === 'auto' ? this.determineRole() : (config.role || 'replica')
|
||||
this.coordinator = coordinator
|
||||
this.cacheSync = cacheSync
|
||||
|
||||
this.replicationLog = {
|
||||
operations: [],
|
||||
lastSequence: 0,
|
||||
primaryVersion: 0
|
||||
}
|
||||
|
||||
// Setup connections based on role
|
||||
this.setupConnections()
|
||||
}
|
||||
|
||||
/**
|
||||
* Start read/write separation
|
||||
*/
|
||||
async start(): Promise<void> {
|
||||
if (this.isRunning) return
|
||||
|
||||
this.isRunning = true
|
||||
|
||||
// Start components
|
||||
await this.coordinator.start()
|
||||
|
||||
// Setup role-specific behavior
|
||||
if (this.role === 'primary') {
|
||||
this.startAsPrimary()
|
||||
} else {
|
||||
this.startAsReplica()
|
||||
}
|
||||
|
||||
this.emit('started', { nodeId: this.nodeId, role: this.role })
|
||||
}
|
||||
|
||||
/**
|
||||
* Stop read/write separation
|
||||
*/
|
||||
async stop(): Promise<void> {
|
||||
if (!this.isRunning) return
|
||||
|
||||
this.isRunning = false
|
||||
|
||||
if (this.syncTimer) {
|
||||
clearInterval(this.syncTimer)
|
||||
this.syncTimer = undefined
|
||||
}
|
||||
|
||||
await this.coordinator.stop()
|
||||
|
||||
this.emit('stopped', { nodeId: this.nodeId })
|
||||
}
|
||||
|
||||
/**
|
||||
* Execute a write operation (primary only)
|
||||
*/
|
||||
async write(operation: Omit<WriteOperation, 'id' | 'timestamp' | 'version'>): Promise<string> {
|
||||
if (this.role !== 'primary') {
|
||||
// Forward to primary
|
||||
if (this.primaryConnection) {
|
||||
return this.primaryConnection.forwardWrite(operation)
|
||||
}
|
||||
throw new Error('Cannot write: not connected to primary')
|
||||
}
|
||||
|
||||
// Generate operation metadata
|
||||
const writeOp: WriteOperation = {
|
||||
id: this.generateOperationId(),
|
||||
...operation,
|
||||
timestamp: Date.now(),
|
||||
version: ++this.replicationLog.primaryVersion
|
||||
}
|
||||
|
||||
// Add to replication log
|
||||
this.replicationLog.operations.push(writeOp)
|
||||
this.replicationLog.lastSequence++
|
||||
|
||||
// Propagate to replicas
|
||||
this.propagateToReplicas(writeOp)
|
||||
|
||||
// Update cache
|
||||
if (operation.type !== 'delete') {
|
||||
this.cacheSync.set(writeOp.id, operation.data)
|
||||
} else {
|
||||
this.cacheSync.delete(writeOp.id)
|
||||
}
|
||||
|
||||
this.emit('write', writeOp)
|
||||
|
||||
return writeOp.id
|
||||
}
|
||||
|
||||
/**
|
||||
* Execute a read operation
|
||||
*/
|
||||
async read(key: string, options?: { consistency?: 'eventual' | 'strong' }): Promise<any> {
|
||||
const consistency = options?.consistency || this.config.consistencyLevel || 'eventual'
|
||||
|
||||
if (consistency === 'strong' && this.role === 'replica') {
|
||||
// For strong consistency, read from primary
|
||||
if (this.primaryConnection) {
|
||||
return this.primaryConnection.read(key)
|
||||
}
|
||||
throw new Error('Cannot guarantee strong consistency: not connected to primary')
|
||||
}
|
||||
|
||||
// Check cache first
|
||||
const cached = this.cacheSync.get(key)
|
||||
if (cached !== undefined) {
|
||||
return cached
|
||||
}
|
||||
|
||||
// Read from appropriate source based on preference
|
||||
if (this.config.readPreference === 'primary' && this.primaryConnection) {
|
||||
return this.primaryConnection.read(key)
|
||||
}
|
||||
|
||||
// Read locally (replica or primary)
|
||||
return this.readLocal(key)
|
||||
}
|
||||
|
||||
/**
|
||||
* Get replication lag (replica only)
|
||||
*/
|
||||
getReplicationLag(): number {
|
||||
if (this.role === 'primary') return 0
|
||||
|
||||
if (this.primaryConnection) {
|
||||
return Date.now() - this.primaryConnection.lastSync
|
||||
}
|
||||
|
||||
return -1 // Unknown
|
||||
}
|
||||
|
||||
/**
|
||||
* Setup connections based on role
|
||||
*/
|
||||
private setupConnections(): void {
|
||||
if (this.role === 'primary') {
|
||||
// Setup replica connections
|
||||
if (this.config.replicaUrls) {
|
||||
for (const url of this.config.replicaUrls) {
|
||||
const replica = new ReplicaConnection(url)
|
||||
this.replicas.set(url, replica)
|
||||
}
|
||||
}
|
||||
} else {
|
||||
// Setup primary connection
|
||||
if (this.config.primaryUrl) {
|
||||
this.primaryConnection = new PrimaryConnection(this.config.primaryUrl)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Start as primary node
|
||||
*/
|
||||
private startAsPrimary(): void {
|
||||
// Start accepting writes
|
||||
this.emit('roleEstablished', { role: 'primary' })
|
||||
|
||||
// Start replication timer
|
||||
this.syncTimer = setInterval(() => {
|
||||
this.syncReplicas()
|
||||
}, this.config.syncInterval || 1000)
|
||||
}
|
||||
|
||||
/**
|
||||
* Start as replica node
|
||||
*/
|
||||
private startAsReplica(): void {
|
||||
// Start syncing from primary
|
||||
this.emit('roleEstablished', { role: 'replica' })
|
||||
|
||||
// Start sync timer
|
||||
this.syncTimer = setInterval(() => {
|
||||
this.syncFromPrimary()
|
||||
}, this.config.syncInterval || 1000)
|
||||
}
|
||||
|
||||
/**
|
||||
* Sync replicas (primary only)
|
||||
*/
|
||||
private async syncReplicas(): Promise<void> {
|
||||
const batch = this.replicationLog.operations.slice(-100) // Last 100 ops
|
||||
|
||||
for (const [url, replica] of this.replicas) {
|
||||
try {
|
||||
await replica.sync(batch, this.replicationLog.primaryVersion)
|
||||
} catch (error) {
|
||||
this.emit('replicaSyncError', { url, error })
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Sync from primary (replica only)
|
||||
*/
|
||||
private async syncFromPrimary(): Promise<void> {
|
||||
if (!this.primaryConnection) return
|
||||
|
||||
try {
|
||||
const updates = await this.primaryConnection.getUpdates(
|
||||
this.replicationLog.lastSequence
|
||||
)
|
||||
|
||||
// Apply updates
|
||||
for (const op of updates) {
|
||||
await this.applyOperation(op)
|
||||
}
|
||||
|
||||
this.emit('synced', { operations: updates.length })
|
||||
} catch (error) {
|
||||
this.emit('primarySyncError', { error })
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Apply a replicated operation
|
||||
*/
|
||||
private async applyOperation(op: WriteOperation): Promise<void> {
|
||||
// Update local state
|
||||
this.replicationLog.operations.push(op)
|
||||
this.replicationLog.lastSequence = Math.max(
|
||||
this.replicationLog.lastSequence,
|
||||
op.version
|
||||
)
|
||||
|
||||
// Update cache
|
||||
switch (op.type) {
|
||||
case 'add':
|
||||
case 'update':
|
||||
this.cacheSync.set(op.id, op.data)
|
||||
break
|
||||
case 'delete':
|
||||
this.cacheSync.delete(op.id)
|
||||
break
|
||||
}
|
||||
|
||||
this.emit('operationApplied', op)
|
||||
}
|
||||
|
||||
/**
|
||||
* Propagate operation to replicas
|
||||
*/
|
||||
private propagateToReplicas(op: WriteOperation): void {
|
||||
for (const replica of this.replicas.values()) {
|
||||
replica.sendOperation(op).catch(error => {
|
||||
this.emit('replicationError', { replica, error })
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Determine role automatically
|
||||
*/
|
||||
private determineRole(): 'primary' | 'replica' {
|
||||
// Use coordinator's leader election
|
||||
return this.coordinator.isLeader() ? 'primary' : 'replica'
|
||||
}
|
||||
|
||||
/**
|
||||
* Read from local storage
|
||||
*/
|
||||
private async readLocal(key: string): Promise<any> {
|
||||
// This would connect to actual storage
|
||||
// For now, return from cache or undefined
|
||||
return this.cacheSync.get(key)
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate unique operation ID
|
||||
*/
|
||||
private generateOperationId(): string {
|
||||
return `${this.nodeId}-${Date.now()}-${Math.random().toString(36).substring(2, 11)}`
|
||||
}
|
||||
|
||||
/**
|
||||
* Get replication statistics
|
||||
*/
|
||||
getStats(): {
|
||||
role: string
|
||||
replicas: number
|
||||
replicationLag: number
|
||||
operationsInLog: number
|
||||
primaryVersion: number
|
||||
} {
|
||||
return {
|
||||
role: this.role,
|
||||
replicas: this.replicas.size,
|
||||
replicationLag: this.getReplicationLag(),
|
||||
operationsInLog: this.replicationLog.operations.length,
|
||||
primaryVersion: this.replicationLog.primaryVersion
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if node can accept writes
|
||||
*/
|
||||
canWrite(): boolean {
|
||||
return this.role === 'primary'
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if node can serve reads
|
||||
*/
|
||||
canRead(): boolean {
|
||||
if (this.config.consistencyLevel === 'strong') {
|
||||
return this.role === 'primary' || this.primaryConnection !== undefined
|
||||
}
|
||||
return true
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Connection to a replica (used by primary)
|
||||
*/
|
||||
class ReplicaConnection {
|
||||
constructor(private url: string) {
|
||||
// Store URL for connection
|
||||
void this.url
|
||||
}
|
||||
|
||||
async sync(_operations: WriteOperation[], _version: number): Promise<void> {
|
||||
// In real implementation, this would use HTTP/gRPC to this.url
|
||||
// For now, simulate network call
|
||||
await new Promise(resolve => setTimeout(resolve, 10))
|
||||
}
|
||||
|
||||
async sendOperation(_op: WriteOperation): Promise<void> {
|
||||
// Send single operation to replica at this.url
|
||||
await new Promise(resolve => setTimeout(resolve, 5))
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Connection to primary (used by replicas)
|
||||
*/
|
||||
class PrimaryConnection {
|
||||
lastSync: number = Date.now()
|
||||
|
||||
constructor(private url: string) {
|
||||
// Store URL for connection
|
||||
void this.url
|
||||
}
|
||||
|
||||
async getUpdates(_fromSequence: number): Promise<WriteOperation[]> {
|
||||
// In real implementation, fetch from primary at this.url
|
||||
this.lastSync = Date.now()
|
||||
return []
|
||||
}
|
||||
|
||||
async forwardWrite(_operation: any): Promise<string> {
|
||||
// Forward write to primary at this.url
|
||||
await new Promise(resolve => setTimeout(resolve, 20))
|
||||
return `forwarded-${Date.now()}`
|
||||
}
|
||||
|
||||
async read(_key: string): Promise<any> {
|
||||
// Read from primary at this.url for strong consistency
|
||||
await new Promise(resolve => setTimeout(resolve, 10))
|
||||
return undefined
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Create read/write separation manager
|
||||
*/
|
||||
export function createReadWriteSeparation(
|
||||
config: ReplicationConfig,
|
||||
coordinator: DistributedCoordinator,
|
||||
shardManager: ShardManager,
|
||||
cacheSync: CacheSync
|
||||
): ReadWriteSeparation {
|
||||
return new ReadWriteSeparation(config, coordinator, shardManager, cacheSync)
|
||||
}
|
||||
393
src/distributed/shardManager.ts
Normal file
393
src/distributed/shardManager.ts
Normal file
|
|
@ -0,0 +1,393 @@
|
|||
/**
|
||||
* Shard Manager for Horizontal Scaling
|
||||
* Implements consistent hashing for data distribution across shards
|
||||
*/
|
||||
|
||||
import { createHash } from 'crypto'
|
||||
import { EventEmitter } from 'events'
|
||||
|
||||
export interface ShardConfig {
|
||||
shardCount?: number
|
||||
replicationFactor?: number
|
||||
virtualNodes?: number
|
||||
autoRebalance?: boolean
|
||||
}
|
||||
|
||||
export interface Shard {
|
||||
id: string
|
||||
nodeId: string
|
||||
virtualNodes: string[]
|
||||
itemCount: number
|
||||
sizeBytes: number
|
||||
status: 'active' | 'rebalancing' | 'offline'
|
||||
}
|
||||
|
||||
export interface ShardAssignment {
|
||||
shardId: string
|
||||
nodeId: string
|
||||
replicas: string[]
|
||||
}
|
||||
|
||||
/**
|
||||
* Consistent Hash Ring for shard distribution
|
||||
*/
|
||||
class ConsistentHashRing {
|
||||
private ring: Map<number, string> = new Map()
|
||||
private virtualNodes: number
|
||||
private sortedKeys: number[] = []
|
||||
|
||||
constructor(virtualNodes: number = 150) {
|
||||
this.virtualNodes = virtualNodes
|
||||
}
|
||||
|
||||
/**
|
||||
* Add a node to the hash ring
|
||||
*/
|
||||
addNode(nodeId: string): void {
|
||||
for (let i = 0; i < this.virtualNodes; i++) {
|
||||
const virtualNodeId = `${nodeId}:${i}`
|
||||
const hash = this.hash(virtualNodeId)
|
||||
this.ring.set(hash, nodeId)
|
||||
}
|
||||
this.updateSortedKeys()
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove a node from the hash ring
|
||||
*/
|
||||
removeNode(nodeId: string): void {
|
||||
const keysToRemove: number[] = []
|
||||
|
||||
for (const [hash, node] of this.ring) {
|
||||
if (node === nodeId) {
|
||||
keysToRemove.push(hash)
|
||||
}
|
||||
}
|
||||
|
||||
for (const key of keysToRemove) {
|
||||
this.ring.delete(key)
|
||||
}
|
||||
|
||||
this.updateSortedKeys()
|
||||
}
|
||||
|
||||
/**
|
||||
* Get the node responsible for a given key
|
||||
*/
|
||||
getNode(key: string): string | null {
|
||||
if (this.ring.size === 0) return null
|
||||
|
||||
const hash = this.hash(key)
|
||||
|
||||
// Find the first node with hash >= key hash
|
||||
for (const nodeHash of this.sortedKeys) {
|
||||
if (nodeHash >= hash) {
|
||||
return this.ring.get(nodeHash) || null
|
||||
}
|
||||
}
|
||||
|
||||
// Wrap around to the first node
|
||||
return this.ring.get(this.sortedKeys[0]) || null
|
||||
}
|
||||
|
||||
/**
|
||||
* Get N nodes for replication
|
||||
*/
|
||||
getNodes(key: string, count: number): string[] {
|
||||
if (this.ring.size === 0) return []
|
||||
|
||||
const nodes = new Set<string>()
|
||||
const hash = this.hash(key)
|
||||
|
||||
// Start from the primary node position
|
||||
let startIdx = 0
|
||||
for (let i = 0; i < this.sortedKeys.length; i++) {
|
||||
if (this.sortedKeys[i] >= hash) {
|
||||
startIdx = i
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
// Collect unique nodes
|
||||
let idx = startIdx
|
||||
while (nodes.size < count && nodes.size < this.getUniqueNodeCount()) {
|
||||
const nodeHash = this.sortedKeys[idx % this.sortedKeys.length]
|
||||
const node = this.ring.get(nodeHash)
|
||||
if (node) {
|
||||
nodes.add(node)
|
||||
}
|
||||
idx++
|
||||
}
|
||||
|
||||
return Array.from(nodes)
|
||||
}
|
||||
|
||||
/**
|
||||
* Get unique node count
|
||||
*/
|
||||
private getUniqueNodeCount(): number {
|
||||
return new Set(this.ring.values()).size
|
||||
}
|
||||
|
||||
/**
|
||||
* Update sorted keys for efficient lookup
|
||||
*/
|
||||
private updateSortedKeys(): void {
|
||||
this.sortedKeys = Array.from(this.ring.keys()).sort((a, b) => a - b)
|
||||
}
|
||||
|
||||
/**
|
||||
* Hash function for consistent hashing
|
||||
*/
|
||||
private hash(key: string): number {
|
||||
const hash = createHash('md5').update(key).digest()
|
||||
return hash.readUInt32BE(0)
|
||||
}
|
||||
|
||||
/**
|
||||
* Get all nodes in the ring
|
||||
*/
|
||||
getAllNodes(): string[] {
|
||||
return Array.from(new Set(this.ring.values()))
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Shard Manager for distributing data across multiple nodes
|
||||
*/
|
||||
export class ShardManager extends EventEmitter {
|
||||
private hashRing: ConsistentHashRing
|
||||
private shards: Map<string, Shard> = new Map()
|
||||
private nodeToShards: Map<string, Set<string>> = new Map()
|
||||
private shardCount: number
|
||||
private replicationFactor: number
|
||||
private autoRebalance: boolean
|
||||
|
||||
constructor(config: ShardConfig = {}) {
|
||||
super()
|
||||
|
||||
this.shardCount = config.shardCount || 64
|
||||
this.replicationFactor = config.replicationFactor || 3
|
||||
this.autoRebalance = config.autoRebalance ?? true
|
||||
|
||||
this.hashRing = new ConsistentHashRing(config.virtualNodes || 150)
|
||||
|
||||
// Initialize shards
|
||||
this.initializeShards()
|
||||
}
|
||||
|
||||
/**
|
||||
* Initialize shard configuration
|
||||
*/
|
||||
private initializeShards(): void {
|
||||
for (let i = 0; i < this.shardCount; i++) {
|
||||
const shardId = `shard-${i.toString().padStart(3, '0')}`
|
||||
this.shards.set(shardId, {
|
||||
id: shardId,
|
||||
nodeId: '',
|
||||
virtualNodes: [],
|
||||
itemCount: 0,
|
||||
sizeBytes: 0,
|
||||
status: 'offline'
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Add a node to the cluster
|
||||
*/
|
||||
addNode(nodeId: string): void {
|
||||
this.hashRing.addNode(nodeId)
|
||||
this.nodeToShards.set(nodeId, new Set())
|
||||
|
||||
// Assign shards to the new node
|
||||
this.rebalanceShards()
|
||||
|
||||
this.emit('nodeAdded', { nodeId })
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove a node from the cluster
|
||||
*/
|
||||
removeNode(nodeId: string): void {
|
||||
const affectedShards = this.nodeToShards.get(nodeId) || new Set()
|
||||
|
||||
this.hashRing.removeNode(nodeId)
|
||||
this.nodeToShards.delete(nodeId)
|
||||
|
||||
// Reassign affected shards
|
||||
for (const shardId of affectedShards) {
|
||||
const shard = this.shards.get(shardId)
|
||||
if (shard) {
|
||||
shard.status = 'rebalancing'
|
||||
}
|
||||
}
|
||||
|
||||
this.rebalanceShards()
|
||||
|
||||
this.emit('nodeRemoved', { nodeId, affectedShards: Array.from(affectedShards) })
|
||||
}
|
||||
|
||||
/**
|
||||
* Get shard assignment for a key
|
||||
*/
|
||||
getShardForKey(key: string): ShardAssignment | null {
|
||||
const shardId = this.getShardId(key)
|
||||
const nodes = this.hashRing.getNodes(shardId, this.replicationFactor)
|
||||
|
||||
if (nodes.length === 0) return null
|
||||
|
||||
return {
|
||||
shardId,
|
||||
nodeId: nodes[0],
|
||||
replicas: nodes.slice(1)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get shard ID for a key
|
||||
*/
|
||||
private getShardId(key: string): string {
|
||||
const hash = createHash('md5').update(key).digest()
|
||||
const shardIndex = hash.readUInt16BE(0) % this.shardCount
|
||||
return `shard-${shardIndex.toString().padStart(3, '0')}`
|
||||
}
|
||||
|
||||
/**
|
||||
* Rebalance shards across nodes
|
||||
*/
|
||||
private rebalanceShards(): void {
|
||||
if (!this.autoRebalance) return
|
||||
|
||||
const nodes = this.hashRing.getAllNodes()
|
||||
if (nodes.length === 0) return
|
||||
|
||||
// Clear current assignments
|
||||
for (const nodeSet of this.nodeToShards.values()) {
|
||||
nodeSet.clear()
|
||||
}
|
||||
|
||||
// Reassign each shard
|
||||
for (const [shardId, shard] of this.shards) {
|
||||
const assignedNodes = this.hashRing.getNodes(shardId, 1)
|
||||
if (assignedNodes.length > 0) {
|
||||
shard.nodeId = assignedNodes[0]
|
||||
shard.status = 'active'
|
||||
|
||||
const nodeShards = this.nodeToShards.get(assignedNodes[0])
|
||||
if (nodeShards) {
|
||||
nodeShards.add(shardId)
|
||||
}
|
||||
} else {
|
||||
shard.status = 'offline'
|
||||
}
|
||||
}
|
||||
|
||||
this.emit('rebalanced', { nodes, shardCount: this.shardCount })
|
||||
}
|
||||
|
||||
/**
|
||||
* Get all shards for a node
|
||||
*/
|
||||
getShardsForNode(nodeId: string): string[] {
|
||||
return Array.from(this.nodeToShards.get(nodeId) || [])
|
||||
}
|
||||
|
||||
/**
|
||||
* Get shard statistics
|
||||
*/
|
||||
getShardStats(): {
|
||||
totalShards: number
|
||||
activeShards: number
|
||||
rebalancingShards: number
|
||||
offlineShards: number
|
||||
averageItemsPerShard: number
|
||||
} {
|
||||
let activeShards = 0
|
||||
let rebalancingShards = 0
|
||||
let offlineShards = 0
|
||||
let totalItems = 0
|
||||
|
||||
for (const shard of this.shards.values()) {
|
||||
switch (shard.status) {
|
||||
case 'active':
|
||||
activeShards++
|
||||
break
|
||||
case 'rebalancing':
|
||||
rebalancingShards++
|
||||
break
|
||||
case 'offline':
|
||||
offlineShards++
|
||||
break
|
||||
}
|
||||
totalItems += shard.itemCount
|
||||
}
|
||||
|
||||
return {
|
||||
totalShards: this.shardCount,
|
||||
activeShards,
|
||||
rebalancingShards,
|
||||
offlineShards,
|
||||
averageItemsPerShard: this.shardCount > 0 ? Math.floor(totalItems / this.shardCount) : 0
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Update shard metrics
|
||||
*/
|
||||
updateShardMetrics(shardId: string, itemCount: number, sizeBytes: number): void {
|
||||
const shard = this.shards.get(shardId)
|
||||
if (shard) {
|
||||
shard.itemCount = itemCount
|
||||
shard.sizeBytes = sizeBytes
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get replication nodes for a shard
|
||||
*/
|
||||
getReplicationNodes(shardId: string): string[] {
|
||||
return this.hashRing.getNodes(shardId, this.replicationFactor)
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if rebalancing is needed
|
||||
*/
|
||||
needsRebalancing(): boolean {
|
||||
const stats = this.getShardStats()
|
||||
return stats.offlineShards > 0 || stats.rebalancingShards > 0
|
||||
}
|
||||
|
||||
/**
|
||||
* Get cluster health
|
||||
*/
|
||||
getHealth(): {
|
||||
healthy: boolean
|
||||
nodes: number
|
||||
shards: {
|
||||
total: number
|
||||
active: number
|
||||
inactive: number
|
||||
}
|
||||
} {
|
||||
const nodes = this.hashRing.getAllNodes()
|
||||
const stats = this.getShardStats()
|
||||
|
||||
return {
|
||||
healthy: stats.activeShards >= this.shardCount * 0.9, // 90% shards active
|
||||
nodes: nodes.length,
|
||||
shards: {
|
||||
total: this.shardCount,
|
||||
active: stats.activeShards,
|
||||
inactive: stats.offlineShards + stats.rebalancingShards
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Create a shard manager instance
|
||||
*/
|
||||
export function createShardManager(config?: ShardConfig): ShardManager {
|
||||
return new ShardManager(config)
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue