Getting ConnectTimeoutException/TimeOut from Azure App Server (P2V2) when putting a load of 3000req/second using tools like Gatling, Jmeter.

Question

I have deployed Spring boot rest API service (deployable - Jar) to Azure App service (one instance). This is a very simple API which is returning an in memory object. API itself takes 1 milliseconds as its returning an in memory object.

When I am putting a load of 3000req/seconds using Gatling/Jmeter. I am getting below timeout exceptions.

1. i.g.h.c.i.RequestTimeoutException: Request timeout
2. j.n.s.SSLException: handshake timed out
3. i.n.c.ConnectTimeoutException: connection timed out

App server configs

Pricing tier : P2V2

OS: Linux

Runtime: JRE8

Note: This is a spring boot jar that is deployed with embedded tomcat. Tomcat max thread count is kept very high server.tomcat.max-threads=4000

server.tomcat.min-spare-threads=3000

So, I do not find any reason why I am getting the time out exceptions.

"Diagnose and solve problems" is not showing anything also.

Please help here.

Answer 1

We probably need more information, I recommend you to open a support ticket, so we can investigate more about this problem.

To create a support request in Azure:
https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request