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504 errors from balancing elastic load using Tomcat

I have an application running on multiple EC2 instances and maintained by Apache Tomcat. I set up the AWS load balancer before the application, and everything basically works as expected. However, I sometimes get a random 504 timeout error from ELB. This does not seem to be load related, as I have seen errors with light load and heavy load. In addition, this does not occur in any regular pattern or situation.

Earlier in my testing, I was getting 504 errors because my application took longer to respond than the 60 second default timeout on ELB. I decided that by typing the ELB timeout to the level necessary for my application. However, the 504 errors that I get now occur very quickly. So, for example, one error that I saw was on request with a response time of about a second. It seems strange to get a timeout error when the request cannot be installed on the application server.

This could be a similar problem for this question , although I could not say from the information provided. In addition, I do not have an additional load balancer in the mix, just ELB directly on Tomcat.

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Source: https://habr.com/ru/post/1691760/

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