wehub-resource-sync
4b6817381b
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39 lines
1.5 KiB
YAML
39 lines
1.5 KiB
YAML
root_cause_category: replication_lag
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required_keywords:
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- replication lag
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- write-heavy workload
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- replica
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- wal
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- replay
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required_evidence_sources:
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- aws_cloudwatch_metrics
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- aws_performance_insights
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equivalent_root_cause_categories:
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- replication_lag_wal_volume
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forbidden_categories:
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- cpu_saturation
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- connection_exhaustion
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optimal_trajectory:
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- query_grafana_metrics
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- query_grafana_logs
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- query_grafana_alert_rules
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- describe_rds_instance
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- describe_rds_events
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max_investigation_loops: 4
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model_response: |
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ROOT_CAUSE: The database hit replication lag because a write-heavy workload on the primary generated WAL faster than the read replica could replay it. The symptom is stale replica reads rather than a primary availability outage.
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ROOT_CAUSE_CATEGORY: replication_lag
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VALIDATED_CLAIMS:
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- ReplicaLag stayed above 900 seconds on payments-prod-replica-1. [evidence: aws_cloudwatch_metrics]
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- WriteIOPS and transaction log generation spiked on the primary during the same window. [evidence: aws_cloudwatch_metrics]
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- Performance Insights shows bulk UPDATE statements dominated DB load with WAL write waits. [evidence: aws_performance_insights]
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NON_VALIDATED_CLAIMS:
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- Reducing batch size or adding replica capacity would likely reduce the lag more quickly.
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CAUSAL_CHAIN:
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- A write-heavy workload drove sustained bulk updates on the primary.
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- WAL generation increased faster than the replica could replay.
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- Replication lag accumulated on payments-prod-replica-1 and stale reads triggered the alert.
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