支持配置等待静态主的时间 · Pull Request !122 · openGauss/CM

【标题】(请简要描述下实现的内容)
支持配置等待静态主的时间

【实现内容】:
新增参数cm_server参数wait_static_primary_times，用于控制在主机挂掉后选出新主之前等待原主恢复的时间，在此之前该值为固定值6。
在每一轮选主流程向选出的候选者下发failover命令之前判断当前已仲裁次数是否小于该参数，如果小于该参数则不下发failover命令，直接进入下一轮选主，继续等待旧主恢复，所以该参数的单位并不是秒。但是每一轮选主流程的耗时基本在1s左右，所以基本也可以认为等待旧主恢复的时间就是wait_static_primary_times秒。

【关联需求或issue】:
https://gitee.com/opengauss/CM/issues/I71NS5?from=project-issue

【开发自验报告】:
设置参数wait_static_primary_times小于最小值5，失败
```
[xuemn@yc-0003 cm_server]$ cm_ctl set --param --server -k "wait_static_primary_times=1"
cm_ctl: The value 1 is outside the valid range for parameter "wait_static_primary_times" (5 .. 2147483647).
cm_ctl: The value "1" for parameter "wait_static_primary_times" is incorrect, requires a integer value
cm_ctl: Try "cm_ctl --help" for more information.
[xuemn@yc-0003 cm_server]$ cm_ctl set --param --server -k "wait_static_primary_times=4"
cm_ctl: The value 4 is outside the valid range for parameter "wait_static_primary_times" (5 .. 2147483647).
cm_ctl: The value "4" for parameter "wait_static_primary_times" is incorrect, requires a integer value
cm_ctl: Try "cm_ctl --help" for more information.
```

设置参数wait_static_primary_times=30成功
```
[xuemn@yc-0003 cm_server]$ cm_ctl set --param --server -k "wait_static_primary_times=30"
cm_ctl: set cm_server.conf success.
[xuemn@yc-0003 cm_server]$ cm_ctl reload --param --server
cm_ctl: reload cm_server.conf success.
[xuemn@yc-0003 cm_server]$ cm_ctl list --param --server | grep wait_static_primary_times
wait_static_primary_times = 30
wait_static_primary_times = 30
wait_static_primary_times = 30
```

向旧主注入错误参数，杀掉主机时间在16:16:20，杀掉之后旧主将会一直处于无法拉起的状态
```
[xuemn@yc-0001 ~]$ kill -9 27126; date
Tue May  9 16:16:20 CST 2023
```
cm_server日志
```
......
2023-05-09 16:16:48.784 tid=31666 AGENT_WORKER LOG: [SendFailoverQuarm], Cannot failover (isDegrade=0) instance 6002, because time(28) is smaller than 30.
2023-05-09 16:16:49.784 tid=31663 CTL_WORKER LOG: [SendFailoverQuarm], Cannot failover (isDegrade=0) instance 6002, because time(29) is smaller than 30.
```
等待主机30秒后，主机仍然无法恢复，所以在16:16:50向6002节点下发failover命令将其升为新主
```
2023-05-09 16:16:50.787 tid=31666 AGENT_WORKER: [KeyEvent: KEY_EVENT_FAILOVER] [Instance: 6002] [Details: Failover message has sent to instance 6002, term 1304, sendFailoverTimes is 0.]
```

符合预期

资料pr：
https://gitee.com/opengauss/docs/pulls/5160

类型	指派人员	状态
审查	opengauss-bot	已完成 (0/0人)
测试	opengauss-bot	已完成 (0/0人)

openGauss/CM .gitee-modal { width: 500px !important; }

搜索帮助

openGauss/CM