Semaphore - What is it?

[Khanna Ji]

Can anybody explain in simple terms what is semaphore, where can I check it and why is it needed in ServiceNow?

[Pranav Bhagat]

Check this

Semaphores -> this is a throttling concept and you can find plenty of information about it on the internet, like for example:

https://dzone.com/articles/java-concurrency-semaphores

Pranav

[Hitoshi Ozawa · Accepted solution]

There's an explanation in the following thread.

https://community.servicenow.com/community?id=community_question&sys_id=c69700b4db1d5fc4b61ff3231f96...

This is what can happen is there's a semaphore problem with an instance.

An instance has multiple application nodes.
 The default settings are for each application node to have a maximum of 50 semaphores,
 with 4 active threads at the time. If transactions come too fast or take too long,
 they can queue up. If the queue reaches the maximum setting, new transactions on the
 queue are refused.

https://hi.service-now.com/kb_view.do?sysparm_article=KB0635977

[Khanna Ji]

In the KB, it states check stats.do in each node but how can I login to a specific node?

[Hitoshi Ozawa]

There's a blog on the topic. To view stats on your instance, just open <your instance url>/stats.do

https://community.servicenow.com/community?id=community_blog&sys_id=6cfda22ddbd0dbc01dcaf3231f961907

TSE attending to your issue asked you to navigate to the URI of the servlet statistics monitoring utility,
 stats.do.