doc: add etcd version tips(apache#602)

jiayx · Oct 26, 2020 · e47fded · e47fded
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diff --git a/README.md b/README.md
@@ -53,3 +53,5 @@ See [CONTRIBUTING](./CONTRIBUTING.md) for details on submitting patches and the
 1. If you need the dashboard-1.0 which is built with Vue.js, please refer to [master-vue](https://github.com/apache/apisix-dashboard/tree/master-vue).
 
 2. The dashboard 2.0 removes MySQL which [dashboard 1.5](https://github.com/apache/apisix-dashboard/tree/backup-1.5-latest) is relied on.
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+3. If you are using APISIX 1.5 and below, note that the v2 api store and v3 api store are [separate and isolated](https://etcd.io/docs/v3.4.0/op-guide/v2-migration/). Dashboard v2.0 and above use the etcd v3 api, APISIX 1.5 and below use the etcd v2 api.
diff --git a/README.zh-CN.md b/README.zh-CN.md
@@ -54,3 +54,4 @@
 
 1. 如果你需要 Vue.js 构建的 dashboard-1.0，请使用 [master-vue 分支](https://github.com/apache/apisix-dashboard/tree/master-vue)。
 2. 2.0 版本的控制台移除了[1.5 版本](https://github.com/apache/apisix-dashboard/tree/backup-1.5-latest)中的 MySQL，将直接操作 etcd。
+3. 如果你使用 v2.0 以下版本的 apisix，需要注意 etcd v2 API 的数据与 v3 API 的数据是[不互通的](https://etcd.io/docs/v3.4.0/op-guide/v2-migration/)。Apisix-dashboard v2.0 及以上版本使用 etcd v3 API，apisix 1.5 及以下版本使用 etcd v2 API。