如何基于java应用程序内存扩展aws ec2集群

I have a java application which is deployed on aws ec2 cluster. I have auto scaling configured based on cpu usage but the problem is application is not CPU intensive but is IO intensive, CPU usage is 20% on an average, so when traffic increases it is not able to send all the messages in real time causing buffering. This is causing delay in arrival of messages in downstream systems.I have a java application which is deployed on