configservice在处理客户端请求时，出现500报错

[weifly]

各位大牛好！最近遇到一个问题，还请帮忙分析下原因，描述如下：

公司运行了apollo配置中心，configservice集群中包含8个服务实例。有一个appid的客户端数量在5000左右。7月29日晚上，这个appid发布了新版配置，大量的客户端拉取新版配置，产生了惊群效应。现象是configservice的cpu100%了，所有服务实例都自动重启了，其中有一个服务实例在处理客户端请求时，出现少量的500报错，不能自动恢复，在手工重启这个实例后，不再报错。

apollo configservice版本：v1.0.0 出现500错误的接口 长轮询 /notifications/v2 查询配置 /configs/{appId}/{clusterName}/{namespace:.+}

其中一类错误： Already value [org.springframework.orm.jpa.EntityManagerHolder@705437c9] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@36a860dd] bound to thread [http-nio-8080-exec-147]

另一类错误： EntityManager is closed; nested exception is java.lang.IllegalStateException: EntityManager is closed

我在本地无法复现这个问题，看了apollo及spring的源码也没有找出详细错误原因，还请帮忙分析下，多谢！

[BlackBear2003]

Hi weifly, maybe it has something related with the code here

https://github.com/apolloconfig/apollo/blob/49bd8ccab93c2484dacabd9d0709bb49efbdfc4b/apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/controller/NotificationControllerV2.java#L188

By the way, can you provide more details?

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