Hi Dev team HashMap and ConcurrentHashMap are the core and widely used classes in the SkyWalking. People are always wondering, whether the 3rd party cache libraries have better performance? Especially when the read/write is the only scenarios
Short conclusion, HashMap, and ConcurrentHashMap are the best choices. Let's keep it in this way. The tests and materials could be found here, https://cwiki.apache.org/confluence/display/SKYWALKING/HashMap+VS+Cache+Libraries Sheng Wu 吴晟 Twitter, wusheng1108
