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1 //! Real-Time Chunk Health Monitoring
2 //!
3 //! Comprehensive monitoring system that tracks chunk health, replica status,
4 //! and data integrity across the distributed network
5
6 use anyhow::Result;
7 use serde::{Deserialize, Serialize};
8 use std::collections::{HashMap, VecDeque, BTreeMap};
9 use chrono::{DateTime, Utc, Duration};
10 use tokio::time::{sleep, Duration as TokioDuration};
11
12 use crate::economics::GeographicRegion;
13
14 /// Real-time chunk health monitoring system
15 #[derive(Debug, Clone, Serialize, Deserialize)]
16 pub struct ChunkHealthMonitor {
17 /// Health status for all monitored chunks
18 pub chunk_health: HashMap<String, ChunkHealth>,
19 /// Node health tracking
20 pub node_health: HashMap<String, NodeHealth>,
21 /// Real-time metrics
22 pub monitoring_metrics: MonitoringMetrics,
23 /// Alert configuration
24 pub alert_config: AlertConfiguration,
25 /// Health check scheduler
26 pub check_scheduler: HealthCheckScheduler,
27 /// Historical health data
28 pub health_history: HashMap<String, VecDeque<HealthSnapshot>>,
29 /// Performance analytics
30 pub analytics: HealthAnalytics,
31 }
32
33 #[derive(Debug, Clone, Serialize, Deserialize)]
34 pub struct ChunkHealth {
35 pub chunk_id: String,
36 pub overall_health: HealthStatus,
37 pub replica_health: Vec<ReplicaHealth>,
38 pub integrity_status: IntegrityStatus,
39 pub availability_score: f64,
40 pub durability_score: f64,
41 pub performance_metrics: ChunkPerformanceMetrics,
42 pub last_verified: DateTime<Utc>,
43 pub next_check_due: DateTime<Utc>,
44 pub risk_factors: Vec<RiskFactor>,
45 pub repair_history: Vec<RepairRecord>,
46 }
47
48 #[derive(Debug, Clone, Serialize, Deserialize)]
49 pub struct ReplicaHealth {
50 pub replica_id: String,
51 pub node_id: String,
52 pub region: GeographicRegion,
53 pub status: ReplicaStatus,
54 pub health_score: f64,
55 pub last_accessed: DateTime<Utc>,
56 pub last_verified: DateTime<Utc>,
57 pub integrity_hash: String,
58 pub performance_metrics: ReplicaPerformanceMetrics,
59 pub connectivity_status: ConnectivityStatus,
60 }
61
62 #[derive(Debug, Clone, Serialize, Deserialize)]
63 pub enum HealthStatus {
64 Excellent, // All replicas healthy, high durability
65 Good, // Most replicas healthy, adequate durability
66 Warning, // Some replicas degraded, durability at risk
67 Critical, // Many replicas unhealthy, immediate action needed
68 Failed, // Cannot guarantee data availability
69 }
70
71 #[derive(Debug, Clone, Serialize, Deserialize)]
72 pub enum ReplicaStatus {
73 Healthy,
74 Degraded,
75 Slow,
76 Unreachable,
77 Corrupted,
78 Missing,
79 Verifying,
80 Repairing,
81 }
82
83 #[derive(Debug, Clone, Serialize, Deserialize)]
84 pub enum IntegrityStatus {
85 Verified,
86 Pending,
87 Suspicious,
88 Corrupted,
89 Unknown,
90 }
91
92 #[derive(Debug, Clone, Serialize, Deserialize)]
93 pub enum ConnectivityStatus {
94 Online,
95 Intermittent,
96 Offline,
97 Unknown,
98 }
99
100 #[derive(Debug, Clone, Serialize, Deserialize)]
101 pub struct ChunkPerformanceMetrics {
102 pub avg_response_time_ms: f64,
103 pub success_rate: f64,
104 pub throughput_mbps: f64,
105 pub error_rate: f64,
106 pub access_frequency: AccessFrequency,
107 pub bandwidth_utilization: f64,
108 }
109
110 #[derive(Debug, Clone, Serialize, Deserialize)]
111 pub struct ReplicaPerformanceMetrics {
112 pub response_time_ms: f64,
113 pub transfer_speed_mbps: f64,
114 pub success_rate: f64,
115 pub error_count: u32,
116 pub last_error: Option<String>,
117 pub uptime_percentage: f64,
118 }
119
120 #[derive(Debug, Clone, Serialize, Deserialize)]
121 pub enum AccessFrequency {
122 VeryHigh, // > 1000 accesses/day
123 High, // 100-1000 accesses/day
124 Medium, // 10-100 accesses/day
125 Low, // 1-10 accesses/day
126 VeryLow, // < 1 access/day
127 Archived, // Not accessed recently
128 }
129
130 #[derive(Debug, Clone, Serialize, Deserialize)]
131 pub struct RiskFactor {
132 pub risk_type: RiskType,
133 pub severity: RiskSeverity,
134 pub probability: f64, // 0.0 to 1.0
135 pub impact: f64, // 0.0 to 1.0
136 pub description: String,
137 pub mitigation_actions: Vec<String>,
138 }
139
140 #[derive(Debug, Clone, Serialize, Deserialize)]
141 pub enum RiskType {
142 NodeFailure,
143 NetworkPartition,
144 GeographicRisk,
145 PerformanceDegradation,
146 CapacityLimits,
147 ComplianceViolation,
148 SecurityThreat,
149 }
150
151 #[derive(Debug, Clone, Serialize, Deserialize)]
152 pub enum RiskSeverity {
153 Low,
154 Medium,
155 High,
156 Critical,
157 }
158
159 #[derive(Debug, Clone, Serialize, Deserialize)]
160 pub struct RepairRecord {
161 pub repair_id: String,
162 pub timestamp: DateTime<Utc>,
163 pub repair_type: RepairType,
164 pub affected_replicas: Vec<String>,
165 pub repair_strategy: String,
166 pub success: bool,
167 pub duration_seconds: u64,
168 pub cost: f64,
169 }
170
171 #[derive(Debug, Clone, Serialize, Deserialize)]
172 pub enum RepairType {
173 ReplicationIncrease,
174 ReplicaReplacement,
175 IntegrityRepair,
176 PerformanceOptimization,
177 GeographicRebalancing,
178 EmergencyRecovery,
179 }
180
181 #[derive(Debug, Clone, Serialize, Deserialize)]
182 pub struct NodeHealth {
183 pub node_id: String,
184 pub region: GeographicRegion,
185 pub overall_health: HealthStatus,
186 pub uptime_percentage: f64,
187 pub response_time_ms: f64,
188 pub bandwidth_mbps: f64,
189 pub storage_health: StorageHealth,
190 pub connectivity_quality: ConnectivityQuality,
191 pub load_metrics: LoadMetrics,
192 pub last_seen: DateTime<Utc>,
193 pub consecutive_failures: u32,
194 }
195
196 #[derive(Debug, Clone, Serialize, Deserialize)]
197 pub struct StorageHealth {
198 pub total_capacity_gb: u64,
199 pub used_capacity_gb: u64,
200 pub available_capacity_gb: u64,
201 pub disk_health_score: f64,
202 pub io_performance: f64,
203 pub error_rate: f64,
204 }
205
206 #[derive(Debug, Clone, Serialize, Deserialize)]
207 pub struct ConnectivityQuality {
208 pub latency_ms: f64,
209 pub jitter_ms: f64,
210 pub packet_loss: f64,
211 pub bandwidth_stability: f64,
212 pub connection_type: String,
213 }
214
215 #[derive(Debug, Clone, Serialize, Deserialize)]
216 pub struct LoadMetrics {
217 pub cpu_usage: f64,
218 pub memory_usage: f64,
219 pub network_utilization: f64,
220 pub disk_utilization: f64,
221 pub active_connections: u32,
222 }
223
224 #[derive(Debug, Clone, Serialize, Deserialize)]
225 pub struct MonitoringMetrics {
226 pub total_chunks_monitored: u64,
227 pub healthy_chunks: u64,
228 pub degraded_chunks: u64,
229 pub critical_chunks: u64,
230 pub failed_chunks: u64,
231 pub total_replicas: u64,
232 pub healthy_replicas: u64,
233 pub degraded_replicas: u64,
234 pub average_health_score: f64,
235 pub monitoring_efficiency: f64,
236 pub last_updated: DateTime<Utc>,
237 }
238
239 #[derive(Debug, Clone, Serialize, Deserialize)]
240 pub struct AlertConfiguration {
241 pub enable_alerts: bool,
242 pub health_thresholds: HealthThresholds,
243 pub notification_channels: Vec<NotificationChannel>,
244 pub alert_cooldown_minutes: u32,
245 pub escalation_rules: Vec<EscalationRule>,
246 }
247
248 #[derive(Debug, Clone, Serialize, Deserialize)]
249 pub struct HealthThresholds {
250 pub critical_health_score: f64,
251 pub warning_health_score: f64,
252 pub max_response_time_ms: f64,
253 pub min_success_rate: f64,
254 pub max_error_rate: f64,
255 pub min_replica_count: u32,
256 pub max_consecutive_failures: u32,
257 }
258
259 #[derive(Debug, Clone, Serialize, Deserialize)]
260 pub struct NotificationChannel {
261 pub channel_type: NotificationType,
262 pub endpoint: String,
263 pub severity_filter: Vec<RiskSeverity>,
264 pub enabled: bool,
265 }
266
267 #[derive(Debug, Clone, Serialize, Deserialize)]
268 pub enum NotificationType {
269 Email,
270 Slack,
271 Webhook,
272 SMS,
273 PagerDuty,
274 }
275
276 #[derive(Debug, Clone, Serialize, Deserialize)]
277 pub struct EscalationRule {
278 pub condition: String,
279 pub delay_minutes: u32,
280 pub action: EscalationAction,
281 pub repeat_count: u32,
282 }
283
284 #[derive(Debug, Clone, Serialize, Deserialize)]
285 pub enum EscalationAction {
286 NotifyManager,
287 AutoRepair,
288 IncreaseReplication,
289 EmergencyProtocol,
290 }
291
292 #[derive(Debug, Clone, Serialize, Deserialize)]
293 pub struct HealthCheckScheduler {
294 pub check_intervals: HashMap<HealthStatus, Duration>,
295 pub priority_queue: BTreeMap<DateTime<Utc>, Vec<String>>, // chunk_ids
296 pub concurrent_checks: u32,
297 pub batch_size: u32,
298 pub adaptive_scheduling: bool,
299 }
300
301 #[derive(Debug, Clone, Serialize, Deserialize)]
302 pub struct HealthSnapshot {
303 pub timestamp: DateTime<Utc>,
304 pub health_status: HealthStatus,
305 pub health_score: f64,
306 pub replica_count: u32,
307 pub healthy_replicas: u32,
308 pub performance_metrics: ChunkPerformanceMetrics,
309 }
310
311 #[derive(Debug, Clone, Serialize, Deserialize)]
312 pub struct HealthAnalytics {
313 pub health_trends: HashMap<String, HealthTrend>,
314 pub failure_patterns: Vec<FailurePattern>,
315 pub performance_baselines: HashMap<String, PerformanceBaseline>,
316 pub prediction_models: HashMap<String, PredictionModel>,
317 }
318
319 #[derive(Debug, Clone, Serialize, Deserialize)]
320 pub struct HealthTrend {
321 pub chunk_id: String,
322 pub trend_direction: TrendDirection,
323 pub trend_strength: f64,
324 pub prediction_confidence: f64,
325 pub time_to_critical: Option<Duration>,
326 }
327
328 #[derive(Debug, Clone, Serialize, Deserialize)]
329 pub enum TrendDirection {
330 Improving,
331 Stable,
332 Degrading,
333 Volatile,
334 }
335
336 #[derive(Debug, Clone, Serialize, Deserialize)]
337 pub struct FailurePattern {
338 pub pattern_id: String,
339 pub pattern_type: String,
340 pub frequency: f64,
341 pub affected_chunks: Vec<String>,
342 pub common_factors: Vec<String>,
343 pub prevention_strategies: Vec<String>,
344 }
345
346 #[derive(Debug, Clone, Serialize, Deserialize)]
347 pub struct PerformanceBaseline {
348 pub metric_name: String,
349 pub baseline_value: f64,
350 pub acceptable_variance: f64,
351 pub seasonal_adjustments: HashMap<u8, f64>, // Month -> adjustment factor
352 }
353
354 #[derive(Debug, Clone, Serialize, Deserialize)]
355 pub struct PredictionModel {
356 pub model_type: String,
357 pub accuracy: f64,
358 pub last_trained: DateTime<Utc>,
359 pub parameters: HashMap<String, f64>,
360 }
361
362 impl Default for HealthThresholds {
363 fn default() -> Self {
364 Self {
365 critical_health_score: 50.0,
366 warning_health_score: 75.0,
367 max_response_time_ms: 1000.0,
368 min_success_rate: 95.0,
369 max_error_rate: 5.0,
370 min_replica_count: 3,
371 max_consecutive_failures: 3,
372 }
373 }
374 }
375
376 impl ChunkHealthMonitor {
377 /// Create new chunk health monitor
378 pub fn new() -> Self {
379 Self {
380 chunk_health: HashMap::new(),
381 node_health: HashMap::new(),
382 monitoring_metrics: MonitoringMetrics {
383 total_chunks_monitored: 0,
384 healthy_chunks: 0,
385 degraded_chunks: 0,
386 critical_chunks: 0,
387 failed_chunks: 0,
388 total_replicas: 0,
389 healthy_replicas: 0,
390 degraded_replicas: 0,
391 average_health_score: 100.0,
392 monitoring_efficiency: 100.0,
393 last_updated: Utc::now(),
394 },
395 alert_config: AlertConfiguration {
396 enable_alerts: true,
397 health_thresholds: HealthThresholds::default(),
398 notification_channels: Vec::new(),
399 alert_cooldown_minutes: 15,
400 escalation_rules: Vec::new(),
401 },
402 check_scheduler: HealthCheckScheduler {
403 check_intervals: HashMap::from([
404 (HealthStatus::Excellent, Duration::hours(24)),
405 (HealthStatus::Good, Duration::hours(6)),
406 (HealthStatus::Warning, Duration::hours(1)),
407 (HealthStatus::Critical, Duration::minutes(15)),
408 (HealthStatus::Failed, Duration::minutes(5)),
409 ]),
410 priority_queue: BTreeMap::new(),
411 concurrent_checks: 10,
412 batch_size: 100,
413 adaptive_scheduling: true,
414 },
415 health_history: HashMap::new(),
416 analytics: HealthAnalytics {
417 health_trends: HashMap::new(),
418 failure_patterns: Vec::new(),
419 performance_baselines: HashMap::new(),
420 prediction_models: HashMap::new(),
421 },
422 }
423 }
424
425 /// Add chunk for monitoring
426 pub fn add_chunk_monitoring(&mut self, chunk_id: String, initial_replicas: Vec<ReplicaHealth>) {
427 let health_score = self.calculate_chunk_health_score(&initial_replicas);
428 let health_status = self.determine_health_status(health_score, &initial_replicas);
429
430 let chunk_health = ChunkHealth {
431 chunk_id: chunk_id.clone(),
432 overall_health: health_status.clone(),
433 replica_health: initial_replicas,
434 integrity_status: IntegrityStatus::Pending,
435 availability_score: health_score,
436 durability_score: health_score,
437 performance_metrics: ChunkPerformanceMetrics {
438 avg_response_time_ms: 0.0,
439 success_rate: 100.0,
440 throughput_mbps: 0.0,
441 error_rate: 0.0,
442 access_frequency: AccessFrequency::Low,
443 bandwidth_utilization: 0.0,
444 },
445 last_verified: Utc::now(),
446 next_check_due: Utc::now() + self.get_check_interval(&health_status),
447 risk_factors: Vec::new(),
448 repair_history: Vec::new(),
449 };
450
451 self.chunk_health.insert(chunk_id.clone(), chunk_health);
452
453 // Schedule health check
454 self.schedule_health_check(chunk_id, Utc::now() + self.get_check_interval(&health_status));
455
456 // Initialize health history
457 self.health_history.insert(chunk_id, VecDeque::with_capacity(1000));
458
459 self.update_monitoring_metrics();
460 }
461
462 /// Perform health check on a chunk
463 pub async fn perform_health_check(&mut self, chunk_id: &str) -> Result<HealthCheckResult> {
464 let chunk_health = self.chunk_health.get_mut(chunk_id)
465 .ok_or_else(|| anyhow::anyhow!("Chunk not found in monitoring"))?;
466
467 let mut check_results = Vec::new();
468 let mut healthy_replicas = 0;
469 let mut total_response_time = 0.0;
470
471 // Check each replica
472 for replica in &mut chunk_health.replica_health {
473 let replica_result = self.check_replica_health(replica).await?;
474
475 if matches!(replica_result.status, ReplicaStatus::Healthy) {
476 healthy_replicas += 1;
477 }
478
479 total_response_time += replica_result.response_time_ms;
480 check_results.push(replica_result);
481 }
482
483 // Update chunk health based on check results
484 let new_health_score = self.calculate_chunk_health_score(&chunk_health.replica_health);
485 let new_health_status = self.determine_health_status(new_health_score, &chunk_health.replica_health);
486
487 chunk_health.overall_health = new_health_status.clone();
488 chunk_health.availability_score = new_health_score;
489 chunk_health.performance_metrics.avg_response_time_ms = total_response_time / check_results.len() as f64;
490 chunk_health.performance_metrics.success_rate = (healthy_replicas as f64 / check_results.len() as f64) * 100.0;
491 chunk_health.last_verified = Utc::now();
492 chunk_health.next_check_due = Utc::now() + self.get_check_interval(&new_health_status);
493
494 // Update risk factors
495 chunk_health.risk_factors = self.assess_risk_factors(chunk_health);
496
497 // Record health snapshot
498 self.record_health_snapshot(chunk_id, chunk_health);
499
500 // Schedule next check
501 self.schedule_health_check(chunk_id.to_string(), chunk_health.next_check_due);
502
503 // Check for alerts
504 if self.alert_config.enable_alerts {
505 self.check_alert_conditions(chunk_id, chunk_health).await?;
506 }
507
508 self.update_monitoring_metrics();
509
510 Ok(HealthCheckResult {
511 chunk_id: chunk_id.to_string(),
512 health_status: new_health_status,
513 health_score: new_health_score,
514 replica_results: check_results,
515 issues_detected: chunk_health.risk_factors.clone(),
516 recommendations: self.generate_recommendations(chunk_health),
517 })
518 }
519
520 /// Check individual replica health
521 async fn check_replica_health(&mut self, replica: &mut ReplicaHealth) -> Result<ReplicaCheckResult> {
522 let start_time = std::time::Instant::now();
523
524 // Simulate health check (in real implementation, this would be actual network calls)
525 let connectivity_check = self.check_replica_connectivity(&replica.node_id).await?;
526 let integrity_check = self.verify_replica_integrity(replica).await?;
527 let performance_check = self.measure_replica_performance(replica).await?;
528
529 let check_duration = start_time.elapsed();
530
531 // Update replica status based on checks
532 replica.status = if connectivity_check && integrity_check && performance_check.response_time_ms < 1000.0 {
533 ReplicaStatus::Healthy
534 } else if connectivity_check && integrity_check {
535 ReplicaStatus::Slow
536 } else if connectivity_check {
537 ReplicaStatus::Degraded
538 } else {
539 ReplicaStatus::Unreachable
540 };
541
542 replica.last_verified = Utc::now();
543 replica.performance_metrics = performance_check.clone();
544
545 Ok(ReplicaCheckResult {
546 replica_id: replica.replica_id.clone(),
547 node_id: replica.node_id.clone(),
548 status: replica.status.clone(),
549 response_time_ms: performance_check.response_time_ms,
550 connectivity_ok: connectivity_check,
551 integrity_ok: integrity_check,
552 performance_metrics: performance_check,
553 })
554 }
555
556 /// Check replica connectivity
557 async fn check_replica_connectivity(&self, node_id: &str) -> Result<bool> {
558 // Simulate connectivity check
559 tokio::time::sleep(TokioDuration::from_millis(10)).await;
560
561 // Check if node is in our health records and recently seen
562 if let Some(node_health) = self.node_health.get(node_id) {
563 let time_since_last_seen = Utc::now() - node_health.last_seen;
564 Ok(time_since_last_seen < Duration::minutes(5))
565 } else {
566 Ok(false)
567 }
568 }
569
570 /// Verify replica integrity
571 async fn verify_replica_integrity(&self, replica: &ReplicaHealth) -> Result<bool> {
572 // Simulate integrity verification
573 tokio::time::sleep(TokioDuration::from_millis(50)).await;
574
575 // In real implementation, this would verify checksums, etc.
576 Ok(!replica.integrity_hash.is_empty())
577 }
578
579 /// Measure replica performance
580 async fn measure_replica_performance(&self, replica: &ReplicaHealth) -> Result<ReplicaPerformanceMetrics> {
581 // Simulate performance measurement
582 let base_latency = 100.0;
583 let jitter = (rand::random::<f64>() - 0.5) * 50.0;
584 let response_time = base_latency + jitter;
585
586 tokio::time::sleep(TokioDuration::from_millis(response_time as u64)).await;
587
588 Ok(ReplicaPerformanceMetrics {
589 response_time_ms: response_time.max(0.0),
590 transfer_speed_mbps: 50.0 + (rand::random::<f64>() * 50.0),
591 success_rate: 95.0 + (rand::random::<f64>() * 5.0),
592 error_count: 0,
593 last_error: None,
594 uptime_percentage: 99.0 + (rand::random::<f64>() * 1.0),
595 })
596 }
597
598 /// Calculate overall chunk health score
599 fn calculate_chunk_health_score(&self, replicas: &[ReplicaHealth]) -> f64 {
600 if replicas.is_empty() {
601 return 0.0;
602 }
603
604 let healthy_count = replicas.iter()
605 .filter(|r| matches!(r.status, ReplicaStatus::Healthy))
606 .count();
607
608 let degraded_count = replicas.iter()
609 .filter(|r| matches!(r.status, ReplicaStatus::Degraded | ReplicaStatus::Slow))
610 .count();
611
612 let unhealthy_count = replicas.len() - healthy_count - degraded_count;
613
614 // Weight factors
615 let healthy_weight = 1.0;
616 let degraded_weight = 0.5;
617 let unhealthy_weight = 0.0;
618
619 let weighted_score = (healthy_count as f64 * healthy_weight
620 + degraded_count as f64 * degraded_weight
621 + unhealthy_count as f64 * unhealthy_weight) / replicas.len() as f64;
622
623 weighted_score * 100.0
624 }
625
626 /// Determine health status from score and replica states
627 fn determine_health_status(&self, health_score: f64, replicas: &[ReplicaHealth]) -> HealthStatus {
628 let healthy_count = replicas.iter()
629 .filter(|r| matches!(r.status, ReplicaStatus::Healthy))
630 .count();
631
632 let total_count = replicas.len();
633
634 if health_score >= 90.0 && healthy_count >= (total_count * 3) / 4 {
635 HealthStatus::Excellent
636 } else if health_score >= 75.0 && healthy_count >= total_count / 2 {
637 HealthStatus::Good
638 } else if health_score >= 50.0 && healthy_count >= total_count / 3 {
639 HealthStatus::Warning
640 } else if healthy_count > 0 {
641 HealthStatus::Critical
642 } else {
643 HealthStatus::Failed
644 }
645 }
646
647 /// Get check interval for health status
648 fn get_check_interval(&self, status: &HealthStatus) -> Duration {
649 self.check_scheduler.check_intervals
650 .get(status)
651 .copied()
652 .unwrap_or(Duration::hours(6))
653 }
654
655 /// Schedule health check
656 fn schedule_health_check(&mut self, chunk_id: String, check_time: DateTime<Utc>) {
657 self.check_scheduler.priority_queue
658 .entry(check_time)
659 .or_insert_with(Vec::new)
660 .push(chunk_id);
661 }
662
663 /// Assess risk factors for a chunk
664 fn assess_risk_factors(&self, chunk_health: &ChunkHealth) -> Vec<RiskFactor> {
665 let mut risk_factors = Vec::new();
666
667 // Check replica count
668 let healthy_replicas = chunk_health.replica_health.iter()
669 .filter(|r| matches!(r.status, ReplicaStatus::Healthy))
670 .count();
671
672 if healthy_replicas < 3 {
673 risk_factors.push(RiskFactor {
674 risk_type: RiskType::NodeFailure,
675 severity: if healthy_replicas < 2 { RiskSeverity::Critical } else { RiskSeverity::High },
676 probability: 0.8,
677 impact: 0.9,
678 description: format!("Only {} healthy replicas remaining", healthy_replicas),
679 mitigation_actions: vec!["Increase replication".to_string(), "Replace unhealthy replicas".to_string()],
680 });
681 }
682
683 // Check geographic distribution
684 let regions: std::collections::HashSet<_> = chunk_health.replica_health.iter()
685 .map(|r| &r.region)
686 .collect();
687
688 if regions.len() < 2 {
689 risk_factors.push(RiskFactor {
690 risk_type: RiskType::GeographicRisk,
691 severity: RiskSeverity::Medium,
692 probability: 0.3,
693 impact: 0.7,
694 description: "Poor geographic distribution".to_string(),
695 mitigation_actions: vec!["Add replicas in different regions".to_string()],
696 });
697 }
698
699 // Check performance degradation
700 if chunk_health.performance_metrics.avg_response_time_ms > 1000.0 {
701 risk_factors.push(RiskFactor {
702 risk_type: RiskType::PerformanceDegradation,
703 severity: RiskSeverity::Medium,
704 probability: 0.6,
705 impact: 0.4,
706 description: "High response times detected".to_string(),
707 mitigation_actions: vec!["Optimize replica placement".to_string(), "Check network conditions".to_string()],
708 });
709 }
710
711 risk_factors
712 }
713
714 /// Generate recommendations for chunk health improvement
715 fn generate_recommendations(&self, chunk_health: &ChunkHealth) -> Vec<String> {
716 let mut recommendations = Vec::new();
717
718 match chunk_health.overall_health {
719 HealthStatus::Failed => {
720 recommendations.push("URGENT: Immediate recovery required - chunk data may be lost".to_string());
721 recommendations.push("Attempt recovery from any available replicas".to_string());
722 recommendations.push("Check backup systems".to_string());
723 },
724 HealthStatus::Critical => {
725 recommendations.push("Create additional replicas immediately".to_string());
726 recommendations.push("Repair or replace unhealthy replicas".to_string());
727 recommendations.push("Monitor closely for further degradation".to_string());
728 },
729 HealthStatus::Warning => {
730 recommendations.push("Consider increasing replication factor".to_string());
731 recommendations.push("Investigate cause of replica degradation".to_string());
732 recommendations.push("Improve geographic distribution".to_string());
733 },
734 HealthStatus::Good => {
735 recommendations.push("Monitor performance trends".to_string());
736 recommendations.push("Consider optimizing replica placement for better performance".to_string());
737 },
738 HealthStatus::Excellent => {
739 recommendations.push("Maintain current configuration".to_string());
740 recommendations.push("Consider this as a model for other chunks".to_string());
741 },
742 }
743
744 recommendations
745 }
746
747 /// Record health snapshot in history
748 fn record_health_snapshot(&mut self, chunk_id: &str, chunk_health: &ChunkHealth) {
749 let snapshot = HealthSnapshot {
750 timestamp: Utc::now(),
751 health_status: chunk_health.overall_health.clone(),
752 health_score: chunk_health.availability_score,
753 replica_count: chunk_health.replica_health.len() as u32,
754 healthy_replicas: chunk_health.replica_health.iter()
755 .filter(|r| matches!(r.status, ReplicaStatus::Healthy))
756 .count() as u32,
757 performance_metrics: chunk_health.performance_metrics.clone(),
758 };
759
760 if let Some(history) = self.health_history.get_mut(chunk_id) {
761 history.push_back(snapshot);
762
763 // Keep only last 1000 snapshots
764 if history.len() > 1000 {
765 history.pop_front();
766 }
767 }
768 }
769
770 /// Check alert conditions and send notifications
771 async fn check_alert_conditions(&mut self, chunk_id: &str, chunk_health: &ChunkHealth) -> Result<()> {
772 let thresholds = &self.alert_config.health_thresholds;
773
774 let should_alert = match chunk_health.overall_health {
775 HealthStatus::Failed | HealthStatus::Critical => true,
776 HealthStatus::Warning => chunk_health.availability_score < thresholds.warning_health_score,
777 _ => false,
778 };
779
780 if should_alert {
781 let alert = HealthAlert {
782 alert_id: format!("alert_{}_{}", chunk_id, Utc::now().timestamp()),
783 chunk_id: chunk_id.to_string(),
784 severity: match chunk_health.overall_health {
785 HealthStatus::Failed => RiskSeverity::Critical,
786 HealthStatus::Critical => RiskSeverity::High,
787 HealthStatus::Warning => RiskSeverity::Medium,
788 _ => RiskSeverity::Low,
789 },
790 message: format!("Chunk {} health degraded to {:?}", chunk_id, chunk_health.overall_health),
791 timestamp: Utc::now(),
792 health_score: chunk_health.availability_score,
793 recommendations: self.generate_recommendations(chunk_health),
794 };
795
796 self.send_alert(alert).await?;
797 }
798
799 Ok(())
800 }
801
802 /// Send health alert
803 async fn send_alert(&self, alert: HealthAlert) -> Result<()> {
804 // In real implementation, this would send to configured notification channels
805 tracing::warn!("Health Alert: {} - {} (Score: {:.1})",
806 alert.alert_id, alert.message, alert.health_score);
807
808 for recommendation in &alert.recommendations {
809 tracing::info!("Recommendation: {}", recommendation);
810 }
811
812 Ok(())
813 }
814
815 /// Update monitoring metrics
816 fn update_monitoring_metrics(&mut self) {
817 let total_chunks = self.chunk_health.len() as u64;
818 let mut healthy = 0;
819 let mut degraded = 0;
820 let mut critical = 0;
821 let mut failed = 0;
822 let mut total_score = 0.0;
823 let mut total_replicas = 0;
824 let mut healthy_replicas = 0;
825
826 for chunk_health in self.chunk_health.values() {
827 match chunk_health.overall_health {
828 HealthStatus::Excellent | HealthStatus::Good => healthy += 1,
829 HealthStatus::Warning => degraded += 1,
830 HealthStatus::Critical => critical += 1,
831 HealthStatus::Failed => failed += 1,
832 }
833
834 total_score += chunk_health.availability_score;
835 total_replicas += chunk_health.replica_health.len();
836 healthy_replicas += chunk_health.replica_health.iter()
837 .filter(|r| matches!(r.status, ReplicaStatus::Healthy))
838 .count();
839 }
840
841 self.monitoring_metrics = MonitoringMetrics {
842 total_chunks_monitored: total_chunks,
843 healthy_chunks: healthy,
844 degraded_chunks: degraded,
845 critical_chunks: critical,
846 failed_chunks: failed,
847 total_replicas: total_replicas as u64,
848 healthy_replicas: healthy_replicas as u64,
849 degraded_replicas: (total_replicas - healthy_replicas) as u64,
850 average_health_score: if total_chunks > 0 { total_score / total_chunks as f64 } else { 100.0 },
851 monitoring_efficiency: 100.0, // Would be calculated based on check success rate
852 last_updated: Utc::now(),
853 };
854 }
855
856 /// Run continuous health monitoring
857 pub async fn run_continuous_monitoring(&mut self) -> Result<()> {
858 let mut check_interval = tokio::time::interval(TokioDuration::from_secs(60)); // Check every minute
859
860 loop {
861 check_interval.tick().await;
862
863 // Process due health checks
864 let now = Utc::now();
865 let due_chunks: Vec<String> = self.check_scheduler.priority_queue
866 .range(..=now)
867 .flat_map(|(_, chunks)| chunks.iter().cloned())
868 .collect();
869
870 // Remove processed items from queue
871 self.check_scheduler.priority_queue.retain(|time, _| *time > now);
872
873 // Process health checks in batches
874 for chunk_batch in due_chunks.chunks(self.check_scheduler.batch_size as usize) {
875 let mut check_tasks = Vec::new();
876
877 for chunk_id in chunk_batch {
878 if check_tasks.len() >= self.check_scheduler.concurrent_checks as usize {
879 // Wait for some tasks to complete
880 let _ = futures::future::join_all(check_tasks.drain(..)).await;
881 }
882
883 let chunk_id_clone = chunk_id.clone();
884 let task = async move {
885 // Would perform actual health check here
886 tokio::time::sleep(TokioDuration::from_millis(100)).await;
887 Ok(chunk_id_clone)
888 };
889
890 check_tasks.push(task);
891 }
892
893 // Wait for remaining tasks
894 let results = futures::future::join_all(check_tasks).await;
895
896 // Process results
897 for result in results {
898 match result {
899 Ok(chunk_id) => {
900 if let Err(e) = self.perform_health_check(&chunk_id).await {
901 tracing::error!("Health check failed for chunk {}: {}", chunk_id, e);
902 }
903 },
904 Err(e) => {
905 tracing::error!("Health check task failed: {}", e);
906 }
907 }
908 }
909 }
910
911 // Update analytics
912 self.update_health_analytics();
913 }
914 }
915
916 /// Update health analytics and trends
917 fn update_health_analytics(&mut self) {
918 // Analyze health trends for each chunk
919 for (chunk_id, history) in &self.health_history {
920 if history.len() >= 10 {
921 let trend = self.analyze_health_trend(history);
922 self.analytics.health_trends.insert(chunk_id.clone(), trend);
923 }
924 }
925
926 // Detect failure patterns
927 self.detect_failure_patterns();
928
929 // Update performance baselines
930 self.update_performance_baselines();
931 }
932
933 /// Analyze health trend for a chunk
934 fn analyze_health_trend(&self, history: &VecDeque<HealthSnapshot>) -> HealthTrend {
935 let recent_scores: Vec<f64> = history.iter()
936 .rev()
937 .take(10)
938 .map(|snapshot| snapshot.health_score)
939 .collect();
940
941 let trend_direction = if recent_scores.len() >= 2 {
942 let first_half_avg = recent_scores.iter().take(recent_scores.len() / 2).sum::<f64>() / (recent_scores.len() / 2) as f64;
943 let second_half_avg = recent_scores.iter().skip(recent_scores.len() / 2).sum::<f64>() / (recent_scores.len() - recent_scores.len() / 2) as f64;
944
945 let diff = second_half_avg - first_half_avg;
946 if diff > 5.0 {
947 TrendDirection::Improving
948 } else if diff < -5.0 {
949 TrendDirection::Degrading
950 } else {
951 TrendDirection::Stable
952 }
953 } else {
954 TrendDirection::Stable
955 };
956
957 HealthTrend {
958 chunk_id: String::new(), // Would be filled by caller
959 trend_direction,
960 trend_strength: 0.5, // Simplified calculation
961 prediction_confidence: 0.7,
962 time_to_critical: None, // Would calculate based on trend
963 }
964 }
965
966 /// Detect common failure patterns
967 fn detect_failure_patterns(&mut self) {
968 // Simplified pattern detection
969 // In real implementation, this would use more sophisticated ML algorithms
970 }
971
972 /// Update performance baselines
973 fn update_performance_baselines(&mut self) {
974 // Update baselines based on recent performance data
975 // In real implementation, this would calculate statistical baselines
976 }
977
978 /// Get health summary
979 pub fn get_health_summary(&self) -> HealthSummary {
980 HealthSummary {
981 overall_health: if self.monitoring_metrics.average_health_score >= 90.0 {
982 HealthStatus::Excellent
983 } else if self.monitoring_metrics.average_health_score >= 75.0 {
984 HealthStatus::Good
985 } else if self.monitoring_metrics.average_health_score >= 50.0 {
986 HealthStatus::Warning
987 } else {
988 HealthStatus::Critical
989 },
990 metrics: self.monitoring_metrics.clone(),
991 top_risks: self.get_top_risk_factors(),
992 recommendations: self.get_global_recommendations(),
993 }
994 }
995
996 /// Get top risk factors across all chunks
997 fn get_top_risk_factors(&self) -> Vec<RiskFactor> {
998 let mut all_risks: Vec<RiskFactor> = self.chunk_health
999 .values()
1000 .flat_map(|chunk| chunk.risk_factors.iter().cloned())
1001 .collect();
1002
1003 all_risks.sort_by(|a, b| {
1004 let score_a = a.probability * a.impact;
1005 let score_b = b.probability * b.impact;
1006 score_b.partial_cmp(&score_a).unwrap_or(std::cmp::Ordering::Equal)
1007 });
1008
1009 all_risks.into_iter().take(10).collect()
1010 }
1011
1012 /// Get global recommendations
1013 fn get_global_recommendations(&self) -> Vec<String> {
1014 let mut recommendations = Vec::new();
1015
1016 if self.monitoring_metrics.critical_chunks > 0 {
1017 recommendations.push("URGENT: Address critical chunks immediately".to_string());
1018 }
1019
1020 if self.monitoring_metrics.degraded_chunks > self.monitoring_metrics.total_chunks_monitored / 4 {
1021 recommendations.push("High number of degraded chunks - investigate infrastructure issues".to_string());
1022 }
1023
1024 if self.monitoring_metrics.average_health_score < 80.0 {
1025 recommendations.push("Overall system health is below optimal - consider increasing redundancy".to_string());
1026 }
1027
1028 recommendations
1029 }
1030 }
1031
1032 #[derive(Debug, Clone, Serialize, Deserialize)]
1033 pub struct HealthCheckResult {
1034 pub chunk_id: String,
1035 pub health_status: HealthStatus,
1036 pub health_score: f64,
1037 pub replica_results: Vec<ReplicaCheckResult>,
1038 pub issues_detected: Vec<RiskFactor>,
1039 pub recommendations: Vec<String>,
1040 }
1041
1042 #[derive(Debug, Clone, Serialize, Deserialize)]
1043 pub struct ReplicaCheckResult {
1044 pub replica_id: String,
1045 pub node_id: String,
1046 pub status: ReplicaStatus,
1047 pub response_time_ms: f64,
1048 pub connectivity_ok: bool,
1049 pub integrity_ok: bool,
1050 pub performance_metrics: ReplicaPerformanceMetrics,
1051 }
1052
1053 #[derive(Debug, Clone, Serialize, Deserialize)]
1054 pub struct HealthAlert {
1055 pub alert_id: String,
1056 pub chunk_id: String,
1057 pub severity: RiskSeverity,
1058 pub message: String,
1059 pub timestamp: DateTime<Utc>,
1060 pub health_score: f64,
1061 pub recommendations: Vec<String>,
1062 }
1063
1064 #[derive(Debug, Clone, Serialize, Deserialize)]
1065 pub struct HealthSummary {
1066 pub overall_health: HealthStatus,
1067 pub metrics: MonitoringMetrics,
1068 pub top_risks: Vec<RiskFactor>,
1069 pub recommendations: Vec<String>,
1070 }
1071
1072 #[cfg(test)]
1073 mod tests {
1074 use super::*;
1075
1076 #[test]
1077 fn test_health_monitor_creation() {
1078 let monitor = ChunkHealthMonitor::new();
1079 assert!(monitor.chunk_health.is_empty());
1080 assert!(monitor.alert_config.enable_alerts);
1081 assert_eq!(monitor.monitoring_metrics.total_chunks_monitored, 0);
1082 }
1083
1084 #[test]
1085 fn test_health_score_calculation() {
1086 let monitor = ChunkHealthMonitor::new();
1087
1088 let replicas = vec![
1089 ReplicaHealth {
1090 replica_id: "replica1".to_string(),
1091 node_id: "node1".to_string(),
1092 region: GeographicRegion::NorthAmerica,
1093 status: ReplicaStatus::Healthy,
1094 health_score: 100.0,
1095 last_accessed: Utc::now(),
1096 last_verified: Utc::now(),
1097 integrity_hash: "hash1".to_string(),
1098 performance_metrics: ReplicaPerformanceMetrics {
1099 response_time_ms: 100.0,
1100 transfer_speed_mbps: 50.0,
1101 success_rate: 99.0,
1102 error_count: 0,
1103 last_error: None,
1104 uptime_percentage: 99.9,
1105 },
1106 connectivity_status: ConnectivityStatus::Online,
1107 },
1108 ReplicaHealth {
1109 replica_id: "replica2".to_string(),
1110 node_id: "node2".to_string(),
1111 region: GeographicRegion::Europe,
1112 status: ReplicaStatus::Degraded,
1113 health_score: 70.0,
1114 last_accessed: Utc::now(),
1115 last_verified: Utc::now(),
1116 integrity_hash: "hash2".to_string(),
1117 performance_metrics: ReplicaPerformanceMetrics {
1118 response_time_ms: 300.0,
1119 transfer_speed_mbps: 20.0,
1120 success_rate: 95.0,
1121 error_count: 2,
1122 last_error: Some("Network timeout".to_string()),
1123 uptime_percentage: 98.0,
1124 },
1125 connectivity_status: ConnectivityStatus::Intermittent,
1126 },
1127 ];
1128
1129 let score = monitor.calculate_chunk_health_score(&replicas);
1130 assert!(score > 50.0 && score < 100.0); // Should be between 50-100 for mixed health
1131 }
1132
1133 #[tokio::test]
1134 async fn test_health_check_workflow() {
1135 let mut monitor = ChunkHealthMonitor::new();
1136
1137 let replicas = vec![
1138 ReplicaHealth {
1139 replica_id: "replica1".to_string(),
1140 node_id: "node1".to_string(),
1141 region: GeographicRegion::NorthAmerica,
1142 status: ReplicaStatus::Healthy,
1143 health_score: 100.0,
1144 last_accessed: Utc::now(),
1145 last_verified: Utc::now(),
1146 integrity_hash: "hash1".to_string(),
1147 performance_metrics: ReplicaPerformanceMetrics {
1148 response_time_ms: 100.0,
1149 transfer_speed_mbps: 50.0,
1150 success_rate: 99.0,
1151 error_count: 0,
1152 last_error: None,
1153 uptime_percentage: 99.9,
1154 },
1155 connectivity_status: ConnectivityStatus::Online,
1156 },
1157 ];
1158
1159 monitor.add_chunk_monitoring("test_chunk".to_string(), replicas);
1160 assert_eq!(monitor.chunk_health.len(), 1);
1161
1162 // Perform health check
1163 let result = monitor.perform_health_check("test_chunk").await.unwrap();
1164 assert_eq!(result.chunk_id, "test_chunk");
1165 assert!(!result.replica_results.is_empty());
1166 }
1167 }