当AWS退出ec2实例“正在退出：此实例已计划退出...”时，我需要更改仲裁者。

因此，我需要更改仲裁服务器，创建了一个新服务器，并添加了该服务器中存在的所有内容，因为我已经为此保存了AMI。

要更改副本集成员，我使用MongoDB官方文档中提到的javascript slice方法 在新变量中设置配置

cfg = rs.conf()

从新变量中删除成员

cfg.members.splice(2,1) //remove the third member that is not in use and need to change

然后使用以下命令覆盖副本集配置文档：-

rs.reconfig(cfg)

myreplicaSetName:ARBITER> rs.status()
{
        "set" : "myreplicaSetName","date" : ISODate("2019-12-10T06:49:35.584Z"),"myState" : 7,"term" : NumberLong(3),"syncingTo" : "","syncSourceHost" : "","syncSourceId" : -1,"heartbeatIntervalMillis" : NumberLong(2000),"optimes" : {
                "lastCommittedOpTime" : {
                        "ts" : Timestamp(1575960573,1),"t" : NumberLong(3)
                },"readConcernmajorityOpTime" : {
                        "ts" : Timestamp(1575960573,"appliedOpTime" : {
                        "ts" : Timestamp(1575960573,"durableOpTime" : {
                        "ts" : Timestamp(1575960573,"t" : NumberLong(3)
                }
        },"members" : [
                {
                        "_id" : 0,"name" : "myhostname:port","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 120,"optime" : {
                                "ts" : Timestamp(1575960573,"t" : NumberLong(3)
                        },"optimeDurable" : {
                                "ts" : Timestamp(1575960573,"optimeDate" : ISODate("2019-12-10T06:49:33Z"),"optimeDurableDate" : ISODate("2019-12-10T06:49:33Z"),"lastHeartbeat" : ISODate("2019-12-10T06:49:33.593Z"),"lastHeartbeatRecv" : ISODate("2019-12-10T06:49:35.267Z"),"pingMs" : NumberLong(0),"lastHeartbeatMessage" : "","infoMessage" : "","electionTime" : Timestamp(1554185040,"electionDate" : ISODate("2019-04-02T06:04:00Z"),"configVersion" : 15
                },{
                        "_id" : 1,"name" : "my2ndhostname:port","state" : 2,"stateStr" : "SECONDARY","lastHeartbeat" : ISODate("2019-12-10T06:49:33.592Z"),"lastHeartbeatRecv" : ISODate("2019-12-10T06:49:34.289Z"),"pingMs" : NumberLong(1),"syncingTo" : "myhostname:port","syncSourceHost" : "myhostname:port","syncSourceId" : 0,{
                        "_id" : 2,"name" : "my3rdhostname:port","state" : 7,"stateStr" : "ARBITER","uptime" : 312,"maintenanceMode" : 1,"infoMessage" : "could not find member to sync from","configVersion" : 15,"self" : true,"lastHeartbeatMessage" : ""
                }
        ],"ok" : 1
}

一切与重新配置一起进行，首先，当我添加为ARbiter时，它显示OTHER，然后当我在仲裁服务器中登录mongodb时，它也显示ARBITER，所以这意味着新的ARBITER已成功设置。但是为什么它会在

"infoMessage" : "could not find member to sync from",