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Posted to notifications@dubbo.apache.org by GitBox <gi...@apache.org> on 2022/09/21 04:03:58 UTC
[GitHub] [dubbo] liuzhiguo630 opened a new issue, #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
liuzhiguo630 opened a new issue, #10653:
URL: https://github.com/apache/dubbo/issues/10653
- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
### Environment
* Dubbo version: 3.1.0
* Java version: 1.8.0
### Steps to reproduce this issue
1. 在 Dubbo Provider 端配置 `dubbo.provider.delay = 1000` 并启动服务
2. 启动过程中会发现日志 ` [DUBBO] No valid instance found, stop registering instance address to registry.`
3. 启动后马上到 zookeeper 中查看 /services/xxxService/ 下，会发现并没有刚启动的这台实例的 IP
4. 30s 后 zookeeper 上会出现实例 IP
### 问题原因
`AbstractServiceDiscovery#register()` 在注册到注册中心时，会发现找不到元数据信息，从而报出 `No valid instance` 警告:
<img width="903" alt="CleanShot 2022-09-21 at 11 57 23@2x" src="https://user-images.githubusercontent.com/9815635/191411072-2f4c3833-1929-4e7b-869e-c92037acf7ac.png">
而 30s 后则由 Dubbo 定时线程同步 Metadata 时发现并上报到注册中心的。
怀疑是应用级注册功能，并没有实现 `dubbo.provider.delay` 延迟暴露功能，反而会有冲突，导致实际上 30s 后才暴露。在线上这会。导致旧 Pod 已经下线，新 Pod 还没有注册上去，出现数秒到十数秒 No Provider 问题。
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[GitHub] [dubbo] AlbumenJ commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
AlbumenJ commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1346010848
> * 是否可以直接通过在第一次启动服务时，直接强制刷新到注册中心？
两个方式，一个是提供 API 让用户强制刷新；一个是在 delay 结束后框架侧执行强制刷新。
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[GitHub] [dubbo] azhsmesos commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
azhsmesos commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1345876026
Can I have a try it? Please assigned it to me.
### 方案：
- 是否可以直接通过在第一次启动服务时，直接强制刷新到注册中心？
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[GitHub] [dubbo] AlbumenJ commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
AlbumenJ commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1255749074
由于需要对数据更新数据进行压制，防止应用级实例信息频繁更改对元数据中心、注册中心带来特别大的压力，应用级数据需要使用定期刷新的机制。
这一块可以在 Dubbo QoS 加个命令执行强制刷新数据到注册中心的行为（目前未支持，可以帮忙提交下），然后部署的时候通过 post 脚本去触发。
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[GitHub] [dubbo] AlbumenJ commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
AlbumenJ commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1255749037
由于需要对数据更新数据进行压制，防止应用级实例信息频繁更改对元数据中心、注册中心带来特别大的压力，应用级数据需要使用定期刷新的机制。
这一块可以在 Dubbo QoS 加个命令执行强制刷新数据到注册中心的行为（目前未支持，可以帮忙提交下），然后部署的时候通过 post 脚本去触发。
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[GitHub] [dubbo] AlbumenJ commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
AlbumenJ commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1346009944
> 是否可以通过定时任务来实现延迟注册？
这个issue的核心问题不是延迟注册本身导致的，是应用级服务发现的注册周期就是 30s，导致没有及时刷新到注册中心
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[GitHub] [dubbo] AlbumenJ commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
AlbumenJ commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1346012092
再引申一些，是不是在 Dubbo 启动结束后我们不需要 30s 的 delay，或者是这个 delay 可以缩小到 1s 这种短周期。设计注册 delay 的原因是因为大批量服务发布的时候避免重复注册太多次。
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[GitHub] [dubbo] WeiXiao-Hyy commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by "WeiXiao-Hyy (via GitHub)" <gi...@apache.org>.
WeiXiao-Hyy commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1482217397
你好，可以assigned给我吗？想尝试解决一下～
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[GitHub] [dubbo] AlbumenJ commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
AlbumenJ commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1367782140
Related https://github.com/apache/dubbo/pull/11223
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[GitHub] [dubbo] simonally commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
simonally commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1366428100
项目启动，都不注册了，过30秒也没注册呀！咋解决的
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[GitHub] [dubbo] carlos-heshq commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
carlos-heshq commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1344103454
是否可以通过定时任务来实现延迟注册？
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[GitHub] [dubbo] AlbumenJ commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1486304144
3.2.0 中已经将检测周期缩短到 1s
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[GitHub] [dubbo] AlbumenJ closed issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ closed issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
URL: https://github.com/apache/dubbo/issues/10653
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[GitHub] [dubbo] CrazyHZM commented on issue #10653: dubbo.provider.delay 配置 1 秒结果 30 秒后才注册到注册中心
Posted by GitBox <gi...@apache.org>.
CrazyHZM commented on issue #10653:
URL: https://github.com/apache/dubbo/issues/10653#issuecomment-1346039708
> > * 是否可以直接通过在第一次启动服务时，直接强制刷新到注册中心？
>
> 两个方式，一个是提供 API 让用户强制刷新；一个是在 delay 结束后框架侧执行强制刷新。
使用delay的用户一般只希望控制刚启动的时候的时间，所以比较推荐delay 结束后框架侧执行强制刷新，之后的元数据则通过原有的应用级别30s周期来进行。
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