zrlw opened a new issue #8993:
URL: https://github.com/apache/dubbo/issues/8993
* Dubbo version: 3.0 / master
搜zookeeper not connected可以搜到很多issue，现在github构建依然有：
```
2021-10-08T07:35:43.7080332Z [ERROR] integrate Time elapsed: 4.058 s <<<
ERROR!
2021-10-08T07:35:43.7081792Z java.lang.IllegalStateException:
java.lang.IllegalStateException: zookeeper not connected
2021-10-08T07:35:43.7087481Z at
org.apache.dubbo.integration.single.SingleRegistryCenterDubboProtocolIntegrationTest.integrate(SingleRegistryCenterDubboProtocolIntegrationTest.java:138)
```
问题原因很简单，就是连接zk慢，设置的超时时间短，还没连接上就超时了。
AbstractZookeeperClient的DEFAULT_CONNECTION_TIMEOUT_MS是5000ms，实际上这个默认值用不上，url不设置timeout就会被ConfigCenterConfig的checkDefault方法设为3000ms。
下面是3.0分支debug SingleRegistryCenterDubboProtocolIntegrationTest的调用栈：
```
ConfigCenterConfig.checkDefault() line: 128 <=== timeout为null时设为3000
ConfigCenterConfig(AbstractConfig).postProcessRefresh() line: 714
ConfigCenterConfig(AbstractConfig).refresh() line: 620
DefaultApplicationDeployer.startConfigCenter() line: 253
DefaultApplicationDeployer.initialize() line: 195
DefaultApplicationDeployer.start() line: 538
DubboBootstrap.start(boolean) line: 230
DubboBootstrap.start() line: 220
```
checkDefault代码片段:
```
protected void checkDefault() {
super.checkDefault();
if (namespace == null) {
namespace = CommonConstants.DUBBO;
}
if (group == null) {
group = CommonConstants.DUBBO;
}
if (timeout == null) {
timeout = 3000L;
}
...
}
```
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