On 19/02/2019 08:20, Huxing Zhang wrote:
> Hi,
>
> Currently Tomcat's thread pool implementation, which is under
> org.apache.tomcat.util.net.AbstractEndpoint, does not expose task
> queue size via JMX, while in
> org.apache.catalina.core.StandardThreadExecutor it can be accessed via
> JMX.
>
> The background is that I am involved with a project to auto scale web
> application and the size of task queue is helpful to make the
> decision.
>
> Therefore I propose to expose it via JMX. The implementation could be
> adding a simple method to org.apache.tomcat.util.net.AbstractEndpoint:
+1
Mark
> public int getThreadPoolTaskQueueSize() {
> if (executor!=null) {
> if (executor instanceof ThreadPoolExecutor) {
> return ((ThreadPoolExecutor)executor).getQueue().size();
> } else if (executor instanceof StandardThreadExecutor) {
> return ((StandardThreadExecutor)executor).getQueueSize();
> } else {
> return -1;
> }
> } else {
> return -2;
> }
> }
>
> Another issue is that the default implementation of task queue is hard
> coded to be infinite, I think it is better to make it configurable,
> just like what StandardThreadExecutor does. But I think it worth
> discussion in another thread.
>
> Comments welcome.
>
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