in src/main/java/org/apache/dubbo/proxy/utils/NamingThreadFactory.java [17:23]
public NamingThreadFactory(String name, boolean isDaemon) {
SecurityManager s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() : Thread.currentThread()
.getThreadGroup();
namePrefix = name + "-pool-"+ "thread-";
this.isDaemon = isDaemon;
}