fingthinking opened a new issue #1634: 为什么要在AbstractMonitorFactory#getMonitor这个地方要用上锁 URL: https://github.com/apache/incubator-dubbo/issues/1634 ```Java public Monitor getMonitor(URL url) { url = url.setPath(MonitorService.class.getName()).addParameter(Constants.INTERFACE_KEY, MonitorService.class.getName()); String key = url.toServiceStringWithoutResolving(); LOCK.lock(); try { Monitor monitor = MONITORS.get(key); if (monitor != null) { return monitor; } monitor = createMonitor(url); if (monitor == null) { throw new IllegalStateException("Can not create monitor " + url); } MONITORS.put(key, monitor); return monitor; } finally { // 释放锁 LOCK.unlock(); } } ``` 这段代码中用了LOCK，个人感觉这玩意很重啊，为什么这种方式，难道仅仅是为了每个url只创建一次Monitor？
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