yhs0092 opened a new issue, #3624:
URL: https://github.com/apache/servicecomb-java-chassis/issues/3624
## 测试版本
2.8.2
## 问题原理分析
问题出在
`org.apache.servicecomb.registry.consumer.MicroserviceVersions#setInstances`
方法中:
```java
versions.forEach((key, value) -> value.setInstances(new
ArrayList<>())); // 步骤1, 将 MicroserviceVersion 内的实例列表置空
for (Entry<String, List<MicroserviceInstance>> entry :
mergedInstances.microserviceIdMap.entrySet()) {
// always update microservice versions, because we allow
microservice info override, like schema info
MicroserviceVersion newVersion =
createMicroserviceVersion(entry.getKey(), entry.getValue());
newVersion.setInstances(entry.getValue());
versions.put(entry.getKey(), newVersion); // 步骤2, 用新
MicroserviceVersion 替换旧的空 MicroserviceVersion
}
```
如上述代码片段, 步骤1和步骤2之间, 其他执行微服务调用逻辑的线程从 `MicroserviceVersions` 中拿到的
`MicroserviceVersion` 是空的,
这会影响`org.apache.servicecomb.core.registry.discovery.OperationInstancesDiscoveryFilter#sortedMicroserviceVersion`方法的逻辑,
导致`OperationInstancesDiscoveryFilter`返回的可用实例列表为空, 业务微服务调用报错.
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