---
title: 添加 observer 节点报错 Server state or role not the same as expected-OceanBase数据库使用指南
description: 了解OceanBase数据库在实际应用中关于添加 observer 节点报错 Server state or role not the same as expected相关的常见问题和使用技巧，帮助您快速解决添加 observer 节点报错 Server state or role not the same as expected的难题。
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# 添加 observer 节点报错 Server state or role not the same as expected

更新时间：2026-06-04 01:56

适用版本： V4.0.x、V4.1.x、V4.2.x 内容类型：Troubleshoot  

## 问题现象

在添加 observer 节点时，执行命令 `alter system add server` 出现报错 `Server state or role not the same as expected`。

## 问题原因

查看 RS 日志，可以看到如下告警日志：

```shell
[2024-04-23 08:50:35.548586] WDIAG [RS] check_master_key_empty (ob_rs_master_key_manager.cpp:360) [1039062][T1_L0_G0][T1][XXXXXXXXXXXX-XXXXXXXXXXXXXXXX-X-X] [lt=31][errcode=-4109] state not match(ret=-4109, ret="OB_STATE_NOT_MATCH")
[2024-04-23 08:50:35.548614] WDIAG [RS] master_key_checking_for_adding_server (ob_server_zone_op_service.cpp:327) [1039062][T1_L0_G0][T1][XXXXXXXXXXXX-XXXXXXXXXXXXXXXX-X-X] [lt=28][errcode=-4109] fail to check whether master key is empty(ret=-4109, ret="OB_STATE_NOT_MATCH")
[2024-04-23 08:50:35.548621] WDIAG [RS] add_servers (ob_server_zone_op_service.cpp:157) [1039062][T1_L0_G0][T1][XXXXXXXXXXXX-XXXXXXXXXXXXXXXX-X-X] [lt=6][errcode=-4109] master key checking for adding server is failed(ret=-4109, ret="OB_STATE_NOT_MATCH", addr="xxx.xxx.xxx.xxx:2882", picked_zone=zone2)
[2024-04-23 08:50:35.548640] WDIAG [RS] add_server (ob_root_service.cpp:7215) [1039062][T1_L0_G0][T1][XXXXXXXXXXXX-XXXXXXXXXXXXXXXX-X-X] [lt=15][errcode=-4109] fail to add servers

```

查看 `rootservice.log` 可以看到获取 `master key` 失败的日志。

```shell
grep "\[RsMKM" rootservice.log

```

返回结果如下：

```shell
[2024-04-23 08:50:40.348474] WDIAG [RS] run3 (ob_rs_master_key_manager.cpp:148) [3491][RsMKM][T0][Y0-0000000000000000-0-0] [lt=4][errcode=-4013] fail to reload rs master key mgr(ret=-4013, ret="OB_ALLOCATE_MEMORY_FAILED")

```

添加节点时需要获取所有节点的 master key，如果有节点获取失败便会报错 `Server state or role not the same as expected`。当有某个节点租户内存占用达到 100% 时，RS 在获取 master key 就会失败报错 -4013。

## 适用版本

OceanBase 数据库 V4.x 版本。

## 适用的租户

OceanBase 数据库 SYS 租户、MySQL 租户、Oracle 租户。

## 问题的风险及影响

节点添加失败。

## 解决方法

重启内存满的 observer 节点，确保租户内存水位正常。

## 规避方法

关注租户内存使用情况，避免租户内存耗尽。

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