MongoDB如何修改副本集节点的优先级值

副本集节点的优先级影响选举结果。我们设置不同的优先级来增加某些节点成为主节点的可能性，同时也防止某些节点成为主节点。
具体设置如下：
登录主节点：
test:PRIMARY> cfg = rs.conf()
{
“_id” : "test",
"version" : 4,
"protocolVersion" : NumberLong(1),
"members" : [
                                        "_id" : 0,
" host" : "192.168.0.51:27017",
"arbiterOnly" : false,
"buildInd"exes" : true,
"hidden" : false,
"优先级" : 1,
"标签" : {


                                                            },
                                                 “slaveDelay“：数字（0），
更糟糕的是莫尔布斯普；“ host”：“ 192.168.0.52:27017”，

“ hidden”：false，false，
优先级“：”： 1,
                           "tags": {



                                                          "slaveDelay": NumberLong(0),
“投票”：1
}，
                                                                                                                                                                                                                                                                                                   ​“arbiterOnly”: false,
“buildIndexes”: true,
“隐藏”: false,
“优先级”: 1,
“标签”: {


                 },
“slaveDelay” : NumberLong(0),
“投票” : 1
},
br/>                                  "_id": 3,
                         " host" : "192.168.0.52:27019",
"arbiterOnly" : true,
/> “构建索引" : true,
"隐藏" : false,
                                                                                                                                                                               “slaveDelay”: NumberLong(0) “投票数”: 1 “heartbeatIntervalMillis”: 2000,
            "heartbeatTimeoutSecs": 10,
"electionTimeoutMillis" : 10000,
"catchUpTimeoutMillis" : 60000,
"getLastErrorModes" : {


                   },
"getLastErrorDefaults" : {< br/> "w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("5a94ff92bf8f7ba59f48e552")
}
}
修改节点优先级值：
test:PRIMARY> cfg.members[0].priority = 1
1
test:PRIMARY> cfg.members[0].priority = 3
3
测试：PRIMARY> cfg.members[1].priority = 2
2
测试：PRIMARY> cfg.members[2].priority = 1
1


应用配置：
test :PRIMARY> rs.reconfig(cfg)
{ "ok" : 1 }
test:PRIMARY>

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