Automatic scaling for Amazon MSK clusters
To automatically expand your cluster's storage in response to increased usage, you can configure an Application Auto-Scaling policy for Amazon MSK. In an auto-scaling policy, you set the target disk utilization and the maximum scaling capacity.
Before you use automatic scaling for Amazon MSK, you should consider the following:
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Important
A storage scaling action can occur only once every six hours.
We recommend that you start with a right-sized storage volume for your storage demands. For guidance on right-sizing your cluster, see Right-size your cluster: Number of Standard brokers per cluster.
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Amazon MSK does not reduce cluster storage in response to reduced usage. Amazon MSK does not support decreasing the size of storage volumes. If you need to reduce the size of your cluster storage, you must migrate your existing cluster to a cluster with smaller storage. For information about migrating a cluster, see Migrate to Amazon MSK Cluster.
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Amazon MSK does not support automatic scaling in the Asia Pacific (Osaka) and Africa (Cape Town) Regions.
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When you associate an auto-scaling policy with your cluster, Amazon EC2 Auto Scaling automatically creates an Amazon CloudWatch alarm for target tracking. If you delete a cluster with an auto-scaling policy, this CloudWatch alarm persists. To delete the CloudWatch alarm, you should remove an auto-scaling policy from a cluster before you delete the cluster. To learn more about target tracking, see Target tracking scaling policies for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide.
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