Hello Aquib, On Mon, Nov 2, 2020 at 10:09 AM Aquib Khan <aquib.k...@ukg.com.invalid> wrote: > > Hi, > > We have a usecase where we want that our application should indicate when it > reaches maximum thread limit. Our application is deployed in tomcat. Maximum > thread limit of tomcat is 200, so If 200 threads are reached, does tomcat > provide any logger information? >
As far as I know, there is no logging which will tell you that the thread pool got exhausted but I am pretty sure your application will react to it by throwing connection related exception as you mentioned below. > We tried making multiple rest calls and reducing max threads to 2-3. We faced > ConnectionRefused and socketTimeout Exceptions on client side. But no > exception or logger in Catalina logs. We changed Logging level as well in > logging.properties. > > We tried Changing values of maxThreads, minspareThread, acceptCount in > server.xml. We used Jmeter for making rest calls. > > Can we get any help here? Does tomcat provides any information when it > reaches max thread limit? Do we have to change any property in server.xml or > in logging.properties > Tomcat exposes different thread pool properties via JMX which are available under JMX Object Name:"Catalina:type=ThreadPool". I think in your case "currentThreadCount" and "currentThreadsBusy" will be helpful. "currentThreadCount" will give you thread pool size. "currentThreadsBusy" will tell you how many threads are busy processing requests. Normally if the "currentThreadsBusy" count goes up then it indicates either you have thread blocking or lots of requests are coming in. Based on those numbers, you need to decide on the thread pool size. There are more properties and operations exposed via JMX. You can explore all of them by using jconsole or JMC. If you have any Application Performance Management(APM) tool like AppDynamics, Dynatrace, New Relic etc. it will make your life a bit easier. Those tools usually can throw alerts if thread pool utilization is high and based on which you can act. > Any help in this regard would be highly appreciable. > Thanks in Advance. > > Regards, > Aquib --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
