Cassandra AWS System Memory Guidelines 2025: Optimizing for Modern Hardware and Workloads
System Memory Guidelines for Cassandra AWS - 2025 Edition
What’s New in 2025
The Cassandra memory landscape has evolved significantly:
- Modern JVMs - Java 21 LTS with ZGC and Shenandoah GC offer sub-millisecond pause times
- AWS Graviton3 - ARM-based processors with DDR5 memory provide 50% better memory bandwidth
- Larger heap sizes - Modern GCs handle 100GB+ heaps efficiently
- Container deployments - Memory management in Kubernetes requires different approaches
- Persistent memory - Intel Optane and similar technologies blur the line between RAM and storage
- Tiered storage - Hot data in memory, warm in NVMe, cold in S3
- Vector search workloads - New memory requirements for AI/ML applications
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