Application will typically have a worker thread pool, the thread pool has a corresponding maxThread and queueSize, can also set the acceptCount (such as tomcat, the corresponding is the backlog), I don't know the meaning of queueSize and acceptCount when the same, but feel set queueSize and acceptCount effect is the same,
What is known at the time of setting the scene to distinguish?
https://stackoverflow.com/questions/30613474/explanation-maxqueuesize-in-tomcat-executor