Upgrading the computing specification of mongos nodes can increase the maximum number of connections to the database. You can adjust the mongos node specification appropriately based on the actual conditions of your business access.
Notes
Upgrading the CPU performance and memory capacity of mongos nodes may involve cross-node data migration and cause a momentary disconnection. Therefore, before performing this operation, make sure that your business has an automatic reconnection mechanism. We recommend that you complete this operation within the maintenance time during off-peak hours.
Version requirements
MongoDB version 4.0 and later support adjusting Mongos specifications.
Prerequisites
Instance type: Sharded cluster instance.
Instance status: Running.
The CPU performance and memory capacity of the mongos nodes are insufficient and need to be upgraded.
2. In the MongoDB drop-down list on the left sidebar, select Sharded Instance.
3. Above the Instance List on the right, select the region.
4. In the Instance List, find the target instance.
5. Click the Instance ID to enter the Instance Details page and click the Node Management tab.
6. On the Node Management tab, click the Mongos Node tab.
7. On the Mongos Node tab, click Modify Mongos Configuration. In the pop-up window, configure the new specification.
Parameter
Description
Instance ID/Name
The unique ID and name of the instance.
AZ
The AZ where the instance resides.
Mongos Count
The current number of mongos nodes.
Mongos Specs
Select the new mongos node specification in the drop-down list, which can be 1-core 2 GB MEM, 2-core 4 GB MEM, 4-core 8 GB MEM, 8-core 16 GB MEM, or 16-core 32 GB MEM.
Switch Time
If you select Upon modification completion, the instance specification adjustment task will be executed immediately. Instance memory and capacity adjustment may involve node migration or primary-secondary switch. As the switch time point is uncontrollable, disconnection or restart may occur.
If you select During maintenance period, the task will be executed during the maintenance period. For more information, see Setting Instance Maintenance Period.
Specification Change Fee
Fees after specification adjustment. In pay-as-you-go billing mode, fees are charged hourly by the new specification in three billing tiers.
Compare
You can compare the maximum number of connections before and after the mongos specification adjustment to evaluate whether the new specification meets your needs.
