This topic describes the service architecture and components of ApsaraDB for MongoDB.
Architecture diagram
Components
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Task control
Handles instance lifecycle operations such as creation, configuration changes, and backups. Provides task tracking and error management.
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HA control system
Monitors instance health. If a primary node becomes unavailable, the system fails over to a secondary node and notifies you. You can also manually switch node roles. Switch Node Roles.
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Log collection system
Collects runtime logs, including slow query logs and audit logs. Log Management. Enable audit logging.
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Monitoring system
Collects performance metrics such as basic metrics, disk capacity, network requests, and operation counts. Node monitoring (formerly basic monitoring).
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Backup system
Backs up instances to Object Storage Service (OSS). Supports automatic backups with custom policies and manual backups. Backup files are retained for 7 days by default. Automatically back up ApsaraDB for MongoDB data. Manually back up ApsaraDB for MongoDB data.
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Online migration system
Rebuilds instances from backups when the underlying physical server fails, maintaining service availability. Data migration and synchronization.