SysMemoryUtilization on my Amazon OpenSearch Service cluster is above 90%. I want to know if I need to scale up the size of my cluster.
Resolution
System memory utilization that's above 90% is normal and doesn't cause heap usage issues or overload the OpenSearch Service cluster. So, you don't need to scale up the size of your cluster.
OpenSearch Service uses most of its memory for in-memory data structures and off-heap buffers for efficient and fast access to files. The Java virtual machine (JVM) also requires memory.
To determine whether you need to scale up your cluster, use an Amazon CloudWatch alarm on the following metrics:
- JVM memory pressure
- CPU utilization
- Free storage space
For more information, see Recommended CloudWatch alarms for Amazon OpenSearch Service.