This runbook provides operational procedures for the OrdersService, which is responsible for managing the entire lifecycle of customer orders in the FlowMart e-commerce platform.

Architecture

The OrdersService is responsible for:

• Creating and processing customer orders
• Tracking order status throughout fulfillment
• Coordinating with other services (Inventory, Payment, Shipping)
• Managing order history and amendments

Service Dependencies

Monitoring and Alerting

Key Metrics

Dashboards

• OrdersService Overview
• OrdersService API Metrics
• OrdersService Error Tracking

Common Alerts

Troubleshooting Guides

High Latency

If the service is experiencing high latency:

1. Check system metrics:

   kubectl top pods -n orders

2. Check database metrics in the MongoDB dashboard to identify slow queries.

3. Check dependent services to see if delays are caused by downstream systems:

   curl -X GET https://api.internal.flowmart.com/inventory/health
   curl -X GET https://api.internal.flowmart.com/payment/health

4. Analyze recent changes that might have impacted performance.

5. Scale the service if needed:

   kubectl scale deployment orders-service -n orders --replicas=5

High Error Rate

If the service is experiencing a high error rate:

1. Check application logs:

   kubectl logs -l app=orders-service -n orders --tail=100

2. Check for recent deployments that might have introduced issues:

   kubectl rollout history deployment/orders-service -n orders

3. Verify database connectivity:

   kubectl exec -it $(kubectl get pods -l app=orders-service -n orders -o jsonpath='{.items[0].metadata.name}') -n orders -- node -e "const mongoose = require('mongoose'); mongoose.connect(process.env.MONGODB_URI).then(() => console.log('Connected!')).catch(err => console.error('Connection error', err));"

4. Check dependent services for failures:

   curl -X GET https://api.internal.flowmart.com/inventory/health
   curl -X GET https://api.internal.flowmart.com/payment/health

5. Consider rolling back if issues persist:

   kubectl rollout undo deployment/orders-service -n orders

Database Issues

If there are database connection issues:

1. Check MongoDB status:

   kubectl exec -it $(kubectl get pods -l app=mongodb -n data -o jsonpath='{.items[0].metadata.name}') -n data -- mongo admin -u admin -p $MONGODB_PASSWORD --eval "db.serverStatus()"

2. Verify network connectivity:

   kubectl exec -it $(kubectl get pods -l app=orders-service -n orders -o jsonpath='{.items[0].metadata.name}') -n orders -- ping mongodb.data.svc.cluster.local

3. Check MongoDB resource usage:

   kubectl top pods -l app=mongodb -n data

4. Review MongoDB logs:

   kubectl logs -l app=mongodb -n data --tail=100

Common Operational Tasks

Scaling the Service

To scale the service horizontally:

kubectl scale deployment orders-service -n orders --replicas=<number>

Restarting the Service

To restart all pods:

kubectl rollout restart deployment orders-service -n orders

Viewing Recent Orders

To view recent orders in the database:

kubectl exec -it $(kubectl get pods -l app=orders-service -n orders -o jsonpath='{.items[0].metadata.name}') -n orders -- node -e "const mongoose = require('mongoose'); const Order = require('./models/order'); mongoose.connect(process.env.MONGODB_URI).then(async () => { const orders = await Order.find().sort({createdAt: -1}).limit(10); console.log(JSON.stringify(orders, null, 2)); process.exit(0); });"

Manually Processing Stuck Orders

If orders are stuck in a particular state:

1. Identify stuck orders:

   kubectl exec -it $(kubectl get pods -l app=orders-service -n orders -o jsonpath='{.items[0].metadata.name}') -n orders -- node -e "const mongoose = require('mongoose'); const Order = require('./models/order'); mongoose.connect(process.env.MONGODB_URI).then(async () => { const stuckOrders = await Order.find({status: 'PROCESSING', updatedAt: {$lt: new Date(Date.now() - 30*60*1000)}}); console.log(JSON.stringify(stuckOrders, null, 2)); process.exit(0); });"

2. Manually trigger processing for a specific order:

   curl -X POST https://api.internal.flowmart.com/orders/process -H "Content-Type: application/json" -d '{"orderId": "ORDER_ID", "force": true}'

Recovery Procedures

Database Failure Recovery

If the MongoDB database becomes unavailable:

1. Verify the status of the MongoDB cluster:

   kubectl get pods -l app=mongodb -n data

2. If the primary node is down, initiate a manual failover if necessary:

   kubectl exec -it mongodb-0 -n data -- mongo admin -u admin -p $MONGODB_PASSWORD --eval "rs.stepDown()"

3. If the entire cluster is unavailable, create an incident and notify the Database Team.

4. Once database availability is restored, validate the OrdersService functionality:

   curl -X GET https://api.internal.flowmart.com/orders/health

Event Bus Failure Recovery

If the Event Bus is unavailable:

1. The OrdersService implements the Circuit Breaker pattern and will queue messages locally.

2. When the Event Bus is restored, check the backlog of events:

   kubectl exec -it $(kubectl get pods -l app=orders-service -n orders -o jsonpath='{.items[0].metadata.name}') -n orders -- curl localhost:9090/metrics | grep event_queue

3. Manually trigger event processing if necessary:

   curl -X POST https://api.internal.flowmart.com/orders/admin/process-event-queue -H "Authorization: Bearer $ADMIN_TOKEN"

Disaster Recovery

Complete Service Failure

In case of a complete service failure:

1. Initiate incident response by notifying the on-call team through PagerDuty.

2. Check for region-wide AWS issues on the AWS Status page.

3. If necessary, trigger the DR plan to fail over to the secondary region:

   ./scripts/dr-failover.sh orders-service

4. Update Route53 DNS to point to the secondary region if global failover is needed:

   aws route53 change-resource-record-sets --hosted-zone-id $HOSTED_ZONE_ID --change-batch file://dr-dns-change.json

Maintenance Tasks

Deploying New Versions

kubectl set image deployment/orders-service -n orders orders-service=ecr.aws/flowmart/orders-service:$VERSION

Database Maintenance

Scheduled database maintenance should be performed during off-peak hours:

1. Notify stakeholders through the #maintenance Slack channel.

2. Set OrdersService to maintenance mode:

   curl -X POST https://api.internal.flowmart.com/orders/admin/maintenance -H "Authorization: Bearer $ADMIN_TOKEN" -H "Content-Type: application/json" -d '{"maintenanceMode": true, "message": "Scheduled maintenance"}'

3. Perform database maintenance operations.

4. Turn off maintenance mode:

   curl -X POST https://api.internal.flowmart.com/orders/admin/maintenance -H "Authorization: Bearer $ADMIN_TOKEN" -H "Content-Type: application/json" -d '{"maintenanceMode": false}'

Contact Information

Primary On-Call: Orders Team (rotating schedule)
Secondary On-Call: Platform Team
Escalation Path: Orders Team Lead > Engineering Manager > CTO

Slack Channels:

• #orders-support (primary support channel)
• #orders-alerts (automated alerts)
• #incident-response (for major incidents)

Reference Information

• OrdersService API Documentation
• Architecture Diagram
• Service Level Objectives (SLOs)