lpcy commented on issue #14129:
URL: https://github.com/apache/dubbo/issues/14129#issuecomment-2084575796
> i can see the number of connections in DubboProtocol#getClients and it's
normal.can u provide more information?i can't reproduce this bug.
I found that DubboProtocol#getClients will be called twice:
First:
```
getClients:419, DubboProtocol (org.apache.dubbo.rpc.protocol.dubbo)
protocolBindingRefer:412, DubboProtocol (org.apache.dubbo.rpc.protocol.dubbo)
......
toInvokers:430, RegistryDirectory (org.apache.dubbo.registry.integration)
refreshInvoker:292, RegistryDirectory (org.apache.dubbo.registry.integration)
refreshOverrideAndInvoker:233, RegistryDirectory
(org.apache.dubbo.registry.integration)
notify:209, RegistryDirectory (org.apache.dubbo.registry.integration)
notify:533, AbstractRegistry (org.apache.dubbo.registry.support)
doNotify:373, FailbackRegistry (org.apache.dubbo.registry.support)
notify:365, FailbackRegistry (org.apache.dubbo.registry.support)
doSubscribe:241, ZookeeperRegistry (org.apache.dubbo.registry.zookeeper)
subscribe:300, FailbackRegistry (org.apache.dubbo.registry.support)
......
refreshInterfaceInvoker:464, MigrationInvoker
(org.apache.dubbo.registry.client.migration)
migrateToApplicationFirstInvoker:245, MigrationInvoker
(org.apache.dubbo.registry.client.migration)
refreshInvoker:76, MigrationRuleHandler
(org.apache.dubbo.registry.client.migration)
doMigrate:60, MigrationRuleHandler
(org.apache.dubbo.registry.client.migration)
......
createInvoker:615, ReferenceConfig (org.apache.dubbo.config)
createProxy:461, ReferenceConfig (org.apache.dubbo.config)
init:348, ReferenceConfig (org.apache.dubbo.config)
......
```
second:
```
getClients:419, DubboProtocol (org.apache.dubbo.rpc.protocol.dubbo)
protocolBindingRefer:412, DubboProtocol (org.apache.dubbo.rpc.protocol.dubbo)
......
toInvokers:419, ServiceDiscoveryRegistryDirectory
(org.apache.dubbo.registry.client)
refreshInvoker:313, ServiceDiscoveryRegistryDirectory
(org.apache.dubbo.registry.client)
refreshOverrideAndInvoker:197, ServiceDiscoveryRegistryDirectory
(org.apache.dubbo.registry.client)
notify:189, ServiceDiscoveryRegistryDirectory
(org.apache.dubbo.registry.client)
addListenerAndNotify:236, ServiceInstancesChangedListener
(org.apache.dubbo.registry.client.event.listener)
subscribeURLs:330, ServiceDiscoveryRegistry
(org.apache.dubbo.registry.client)
doSubscribe:227, ServiceDiscoveryRegistry (org.apache.dubbo.registry.client)
subscribe:189, ServiceDiscoveryRegistry (org.apache.dubbo.registry.client)
subscribe:88, ListenerRegistryWrapper (org.apache.dubbo.registry)
subscribe:184, DynamicDirectory (org.apache.dubbo.registry.integration)
subscribe:140, ServiceDiscoveryRegistryDirectory
(org.apache.dubbo.registry.client)
doCreateInvoker:629, RegistryProtocol (org.apache.dubbo.registry.integration)
getServiceDiscoveryInvoker:65, InterfaceCompatibleRegistryProtocol
(org.apache.dubbo.registry.integration)
refreshServiceDiscoveryInvoker:440, MigrationInvoker
(org.apache.dubbo.registry.client.migration)
migrateToApplicationFirstInvoker:246, MigrationInvoker
(org.apache.dubbo.registry.client.migration)
refreshInvoker:76, MigrationRuleHandler
(org.apache.dubbo.registry.client.migration)
doMigrate:60, MigrationRuleHandler
(org.apache.dubbo.registry.client.migration)
onRefer:249, MigrationRuleListener
(org.apache.dubbo.registry.client.migration)
interceptInvoker:594, RegistryProtocol
(org.apache.dubbo.registry.integration)
......
createInvoker:615, ReferenceConfig (org.apache.dubbo.config)
createProxy:461, ReferenceConfig (org.apache.dubbo.config)
init:348, ReferenceConfig (org.apache.dubbo.config)
```
The key method is MigrationInvoker#migrateToApplicationFirstInvoker. The
getClients method will be called separately once:
```java
@Override
public void migrateToApplicationFirstInvoker(MigrationRule newRule) {
CountDownLatch latch = new CountDownLatch(0);
refreshInterfaceInvoker(latch);
refreshServiceDiscoveryInvoker(latch);
// directly calculate preferred invoker, will not wait until address
notify
// calculation will re-occurred when address notify later
calcPreferredInvoker(newRule);
}
```
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