By default, JIRA's max number of connector threads is 150. (Tomcat standalone)
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Expected avg. concurrent number of users in our JIRA system once go live is 300.
* Is it safe to increase the maxThreads to 300? What are the drawbacks?
* What's the recommended max number of threads for 300 concurrent users?
This is a default Tomcat configuration. So, regarding your questions:
1) Is it safe to increase the maxThreads to 300? What are the drawbacks?
If you have enough hardware resources you may safely increase the maxThreads value to beyond of 150 (300 in your case).
2) What's the recommended max number of threads for 300 concurrent users?
Actually we don't have a precise measure for that. This answer deppends of the number of customfields, workflows and plugins that you currently have in your JIRA instance. However, you can try to increase the maxThreads to 300 and test if it will cause you problems. Hence, if you are running JIRA on a Linux/Unix system, remember also to increase your ulimit value.
It depends on your usage of the system. Just increasing the number of threads may not be of any use.
What makes you think you have a problem with the number of threads? (If you have no firm evidence you need more threads, then there is no point changing the setting)
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