Operation description

Note the following items when you invoke this operation:

• Before you invoke this operation, make sure that the following conditions are met:

  • The scaling group is in the Active state.

  • The scaling group has no ongoing scaling activities.

• When the scaling group has no ongoing scaling activities, this operation can bypass the cooldown time and directly trigger a scaling activity.

• If the number of ECS instances to increase based on the scaling rule plus the current number of instances in the scaling group (Total Capacity) is greater than the maximum number of instances (MaxSize), the scaling activity is executed with Total Capacity set to MaxSize.

• If the current number of instances in the scaling group (Total Capacity) minus the number of ECS instances to be removed based on the scaling rule is less than the minimum number of instances (MinSize), the scaling activity is executed with Total Capacity set to MinSize.

A successful response to this operation only indicates that Auto Scaling has accepted the request and can execute the scaling activity. It does not mean that the scaling activity will succeed. You can check the execution status of the scaling activity by using the returned ScalingActivityId.