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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2021/11/19 01:51:03 UTC

[GitHub] [incubator-doris] hf200012 commented on a change in pull request #7150: Add version rollback information

hf200012 commented on a change in pull request #7150:
URL: https://github.com/apache/incubator-doris/pull/7150#discussion_r752805654



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File path: docs/zh-CN/installing/upgrade.md
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@@ -80,3 +80,12 @@ Doris 可以通过滚动升级的方式,平滑进行升级。建议按照以
 1. 确认新版本的文件部署完成后。逐台重启 FE 和 BE 实例即可。
 2. 建议逐台重启 BE 后,再逐台重启 FE。因为通常 Doris 保证 FE 到 BE 的向后兼容性,即老版本的 FE 可以访问新版本的 BE。但可能不支持老版本的 BE 访问新版本的 FE。
 3. 建议确认前一个实例启动成功后,在重启下一个实例。实例启动成功的标识,请参阅安装部署文档。
+
+## 关于版本回滚
+因为数据库是一个有状态的服务,所以在大多数情况下,Palo/Doris 无法支持版本回滚(版本降级)。在某些情况下,可以支持 3 位或 4 位版本的回滚,但不会支持 2 位版本的回滚。

Review comment:
       Once Doris FE is upgraded and started, it does not support version rollback, regardless of the two-digit version number or the three-digit version number
   
   Have you tried this?




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