TCP: out of memory — consider tuning tcp_mem

TCP: out of memory — consider tuning tcp_mem

Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer. Application was running on GNU/Linux OS, Java 8, Tomcat 8 application server. All of sudden one of the application instances became unresponsive. All other application instances were handling the traffic properly. Whenever HTTP request was sent to this application instance from the browser, we were getting following response to be printed on the browser.

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