mongo学习- 副本集大多数原则

副本集中有一个重要的概念“大多数”，意思是说，选择主节点需要大多数决定（本人亲自做了实验）

步骤：

1.开启副本集（如果没有配置好副本集的亲参考我的上篇文章 https://www.cnblogs.com/anxbb/p/9482304.html）

2.运行 rs.status(),查看状态

{

    "set" : "haibin",

    "date" : ISODate("2018-08-16T03:18:05.461Z"),

    "myState" : 1,

    "term" : NumberLong(9),

    "heartbeatIntervalMillis" : NumberLong(2000),

    "optimes" : {

        "lastCommittedOpTime" : {

            "ts" : Timestamp(1534389483, 1),

            "t" : NumberLong(9)

        },

        "appliedOpTime" : {

            "ts" : Timestamp(1534389483, 1),

            "t" : NumberLong(9)

        },

        "durableOpTime" : {

            "ts" : Timestamp(1534389483, 1),

            "t" : NumberLong(9)

        }

    },

    "members" : [

        {

            "_id" : 0,

            "name" : "127.0.0.1:27017",

            "health" : 1.0,

            "state" : 1,

            "stateStr" : "PRIMARY",

            "uptime" : 788,

            "optime" : {

                "ts" : Timestamp(1534389483, 1),

                "t" : NumberLong(9)

            },

            "optimeDate" : ISODate("2018-08-16T03:18:03.000Z"),

            "electionTime" : Timestamp(1534389270, 1),

            "electionDate" : ISODate("2018-08-16T03:14:30.000Z"),

            "configVersion" : 2,

            "self" : true

        },

        {

            "_id" : 1,

            "name" : "127.0.0.1:27018",

            "health" : 1.0,

            "state" : 2,

            "stateStr" : "SECONDARY",

            "uptime" : 6,

            "optime" : {

                "ts" : Timestamp(1534389483, 1),

                "t" : NumberLong(9)

            },

            "optimeDurable" : {

                "ts" : Timestamp(1534389483, 1),

                "t" : NumberLong(9)

            },

            "optimeDate" : ISODate("2018-08-16T03:18:03.000Z"),

            "optimeDurableDate" : ISODate("2018-08-16T03:18:03.000Z"),

            "lastHeartbeat" : ISODate("2018-08-16T03:18:04.903Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:18:03.874Z"),

            "pingMs" : NumberLong(0),

            "syncingTo" : "127.0.0.1:27017",

            "configVersion" : 2

        },

        {

            "_id" : 2,

            "name" : "127.0.0.1:27019",

            "health" : 1.0,

            "state" : 7,

            "stateStr" : "ARBITER",

            "uptime" : 221,

            "lastHeartbeat" : ISODate("2018-08-16T03:18:04.603Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:18:04.103Z"),

            "pingMs" : NumberLong(0),

            "configVersion" : 2

        }

    ],

    "ok" : 1.0

}

　　3.试着关闭 27017这个端口然后在运行 rs.status()，结果如下

{

    "set" : "haibin",

    "date" : ISODate("2018-08-16T03:20:21.708Z"),

    "myState" : 1,

    "term" : NumberLong(10),

    "heartbeatIntervalMillis" : NumberLong(2000),

    "optimes" : {

        "lastCommittedOpTime" : {

            "ts" : Timestamp(1534389603, 1),

            "t" : NumberLong(9)

        },

        "appliedOpTime" : {

            "ts" : Timestamp(1534389616, 1),

            "t" : NumberLong(10)

        },

        "durableOpTime" : {

            "ts" : Timestamp(1534389616, 1),

            "t" : NumberLong(10)

        }

    },

    "members" : [

        {

            "_id" : 0,

            "name" : "127.0.0.1:27017",

            "health" : 0.0,

            "state" : 8,

            "stateStr" : "(not reachable/healthy)",

            "uptime" : 0,

            "optime" : {

                "ts" : Timestamp(0, 0),

                "t" : NumberLong(-1)

            },

            "optimeDurable" : {

                "ts" : Timestamp(0, 0),

                "t" : NumberLong(-1)

            },

            "optimeDate" : ISODate("1970-01-01T00:00:00.000Z"),

            "optimeDurableDate" : ISODate("1970-01-01T00:00:00.000Z"),

            "lastHeartbeat" : ISODate("2018-08-16T03:20:21.009Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:20:02.982Z"),

            "pingMs" : NumberLong(0),

            "lastHeartbeatMessage" : "����Ŀ�������������ܾ����޷����ӡ�",

            "configVersion" : -1

        },

        {

            "_id" : 1,

            "name" : "127.0.0.1:27018",

            "health" : 1.0,

            "state" : 1,

            "stateStr" : "PRIMARY",

            "uptime" : 144,

            "optime" : {

                "ts" : Timestamp(1534389616, 1),

                "t" : NumberLong(10)

            },

            "optimeDate" : ISODate("2018-08-16T03:20:16.000Z"),

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

            "electionTime" : Timestamp(1534389614, 1),

            "electionDate" : ISODate("2018-08-16T03:20:14.000Z"),

            "configVersion" : 2,

            "self" : true

        },

        {

            "_id" : 2,

            "name" : "127.0.0.1:27019",

            "health" : 1.0,

            "state" : 7,

            "stateStr" : "ARBITER",

            "uptime" : 142,

            "lastHeartbeat" : ISODate("2018-08-16T03:20:20.912Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:20:20.345Z"),

            "pingMs" : NumberLong(0),

            "configVersion" : 2

        }

    ],

    "ok" : 1.0

}

　　我们发现现在端口 27018 变成了主节点，27017 为断开状态

4.试着关闭 27019 这个端口然后在运行 rs.status()，结果如下

/* 1 */

{

    "set" : "haibin",

    "date" : ISODate("2018-08-16T03:21:34.102Z"),

    "myState" : 1,

    "term" : NumberLong(10),

    "heartbeatIntervalMillis" : NumberLong(2000),

    "optimes" : {

        "lastCommittedOpTime" : {

            "ts" : Timestamp(1534389603, 1),

            "t" : NumberLong(9)

        },

        "appliedOpTime" : {

            "ts" : Timestamp(1534389686, 1),

            "t" : NumberLong(10)

        },

        "durableOpTime" : {

            "ts" : Timestamp(1534389686, 1),

            "t" : NumberLong(10)

        }

    },

    "members" : [

        {

            "_id" : 0,

            "name" : "127.0.0.1:27017",

            "health" : 0.0,

            "state" : 8,

            "stateStr" : "(not reachable/healthy)",

            "uptime" : 0,

            "optime" : {

                "ts" : Timestamp(0, 0),

                "t" : NumberLong(-1)

            },

            "optimeDurable" : {

                "ts" : Timestamp(0, 0),

                "t" : NumberLong(-1)

            },

            "optimeDate" : ISODate("1970-01-01T00:00:00.000Z"),

            "optimeDurableDate" : ISODate("1970-01-01T00:00:00.000Z"),

            "lastHeartbeat" : ISODate("2018-08-16T03:21:31.166Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:20:02.982Z"),

            "pingMs" : NumberLong(0),

            "lastHeartbeatMessage" : "����Ŀ�������������ܾ����޷����ӡ�",

            "configVersion" : -1

        },

        {

            "_id" : 1,

            "name" : "127.0.0.1:27018",

            "health" : 1.0,

            "state" : 1,

            "stateStr" : "PRIMARY",

            "uptime" : 217,

            "optime" : {

                "ts" : Timestamp(1534389686, 1),

                "t" : NumberLong(10)

            },

            "optimeDate" : ISODate("2018-08-16T03:21:26.000Z"),

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

            "electionTime" : Timestamp(1534389614, 1),

            "electionDate" : ISODate("2018-08-16T03:20:14.000Z"),

            "configVersion" : 2,

            "self" : true

        },

        {

            "_id" : 2,

            "name" : "127.0.0.1:27019",

            "health" : 0.0,

            "state" : 8,

            "stateStr" : "(not reachable/healthy)",

            "uptime" : 0,

            "lastHeartbeat" : ISODate("2018-08-16T03:21:31.966Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:21:25.358Z"),

            "pingMs" : NumberLong(0),

            "lastHeartbeatMessage" : "����Ŀ�������������ܾ����޷����ӡ�",

            "configVersion" : -1

        }

    ],

    "ok" : 1.0

}

　　发现现在 27018这个端口还是主节点，那么我们过一会在运行 rs.tatus(),在看下结果

/* 1 */

{

    "set" : "haibin",

    "date" : ISODate("2018-08-16T03:23:20.966Z"),

    "myState" : 2,

    "term" : NumberLong(10),

    "heartbeatIntervalMillis" : NumberLong(2000),

    "optimes" : {

        "lastCommittedOpTime" : {

            "ts" : Timestamp(1534389603, 1),

            "t" : NumberLong(9)

        },

        "appliedOpTime" : {

            "ts" : Timestamp(1534389686, 1),

            "t" : NumberLong(10)

        },

        "durableOpTime" : {

            "ts" : Timestamp(1534389686, 1),

            "t" : NumberLong(10)

        }

    },

    "members" : [

        {

            "_id" : 0,

            "name" : "127.0.0.1:27017",

            "health" : 0.0,

            "state" : 8,

            "stateStr" : "(not reachable/healthy)",

            "uptime" : 0,

            "optime" : {

                "ts" : Timestamp(0, 0),

                "t" : NumberLong(-1)

            },

            "optimeDurable" : {

                "ts" : Timestamp(0, 0),

                "t" : NumberLong(-1)

            },

            "optimeDate" : ISODate("1970-01-01T00:00:00.000Z"),

            "optimeDurableDate" : ISODate("1970-01-01T00:00:00.000Z"),

            "lastHeartbeat" : ISODate("2018-08-16T03:23:20.305Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:20:02.982Z"),

            "pingMs" : NumberLong(0),

            "lastHeartbeatMessage" : "����Ŀ�������������ܾ����޷����ӡ�",

            "configVersion" : -1

        },

        {

            "_id" : 1,

            "name" : "127.0.0.1:27018",

            "health" : 1.0,

            "state" : 2,

            "stateStr" : "SECONDARY",

            "uptime" : 323,

            "optime" : {

                "ts" : Timestamp(1534389686, 1),

                "t" : NumberLong(10)

            },

            "optimeDate" : ISODate("2018-08-16T03:21:26.000Z"),

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

            "configVersion" : 2,

            "self" : true

        },

        {

            "_id" : 2,

            "name" : "127.0.0.1:27019",

            "health" : 0.0,

            "state" : 8,

            "stateStr" : "(not reachable/healthy)",

            "uptime" : 0,

            "lastHeartbeat" : ISODate("2018-08-16T03:23:13.088Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:21:25.358Z"),

            "pingMs" : NumberLong(0),

            "lastHeartbeatMessage" : "����Ŀ�������������ܾ����޷����ӡ�",

            "configVersion" : -1

        }

    ],

    "ok" : 1.0

}

　　发现此时的27018 已经不是主节点了，变成了备份节点。

经过上面的实验可以让大家知道，副本集的大多数概念，一定要记住。

最后我们再次重启一个节点（27019）过一段时间按发现 27018又变回了主节点

/* 1 */

{

    "set" : "haibin",

    "date" : ISODate("2018-08-16T03:25:34.676Z"),

    "myState" : 1,

    "term" : NumberLong(11),

    "heartbeatIntervalMillis" : NumberLong(2000),

    "optimes" : {

        "lastCommittedOpTime" : {

            "ts" : Timestamp(1534389603, 1),

            "t" : NumberLong(9)

        },

        "appliedOpTime" : {

            "ts" : Timestamp(1534389931, 1),

            "t" : NumberLong(11)

        },

        "durableOpTime" : {

            "ts" : Timestamp(1534389931, 1),

            "t" : NumberLong(11)

        }

    },

    "members" : [

        {

            "_id" : 0,

            "name" : "127.0.0.1:27017",

            "health" : 0.0,

            "state" : 8,

            "stateStr" : "(not reachable/healthy)",

            "uptime" : 0,

            "optime" : {

                "ts" : Timestamp(0, 0),

                "t" : NumberLong(-1)

            },

            "optimeDurable" : {

                "ts" : Timestamp(0, 0),

                "t" : NumberLong(-1)

            },

            "optimeDate" : ISODate("1970-01-01T00:00:00.000Z"),

            "optimeDurableDate" : ISODate("1970-01-01T00:00:00.000Z"),

            "lastHeartbeat" : ISODate("2018-08-16T03:25:31.632Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:20:02.982Z"),

            "pingMs" : NumberLong(0),

            "lastHeartbeatMessage" : "����Ŀ�������������ܾ����޷����ӡ�",

            "configVersion" : -1

        },

        {

            "_id" : 1,

            "name" : "127.0.0.1:27018",

            "health" : 1.0,

            "state" : 1,

            "stateStr" : "PRIMARY",

            "uptime" : 457,

            "optime" : {

                "ts" : Timestamp(1534389931, 1),

                "t" : NumberLong(11)

            },

            "optimeDate" : ISODate("2018-08-16T03:25:31.000Z"),

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

            "electionTime" : Timestamp(1534389928, 1),

            "electionDate" : ISODate("2018-08-16T03:25:28.000Z"),

            "configVersion" : 2,

            "self" : true

        },

        {

            "_id" : 2,

            "name" : "127.0.0.1:27019",

            "health" : 1.0,

            "state" : 7,

            "stateStr" : "ARBITER",

            "uptime" : 7,

            "lastHeartbeat" : ISODate("2018-08-16T03:25:34.640Z"),

            "lastHeartbeatRecv" : ISODate("2018-08-16T03:25:32.362Z"),

            "pingMs" : NumberLong(0),

            "configVersion" : 2

        }

    ],

    "ok" : 1.0

}

　　截取书上的文字说明，说明下为什么要使用这样的规则：

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