昊鼎王五：如何查看mongodb副本集的priority优先级？（通俗讲就是“权重”）
#昊鼎王五：如何查看mongodb副本集的priority优先级？（通俗讲就是“权重”）
关于mongodb副本集的priority
#1.基础知识：
##1.1.mongodb的priority可以用来控制副本集的
##1.2.优先级:
如果在建立config配置时候没有指定 副本集所有成员默认 priority=1,投票选举与优先级没有关系
冲裁节点和延迟节点 priority=0 不参与主的竞争
其他每个节点都有个优先权，可以手动设置优先权来决定谁的成为primay的权重最大。副本集中通过设置priority的值来决定优先权的大小，这个值的范围是0--100，值越大，优先权越高。
##1.3.修改过程:
rs.conf查看副本集成员的priority值 重点看members集合
cfg = rs.conf()
rs.members[_id].priority=
rs.reconfig(cfg)
#注意:修改现有副本集成员时候一定要注意,不能高于主库的priority,否则会导致手动的primiary切换
#2.操作命令：
[hd205@MongDB1 ~]$ mongo -port 90109
MongoDB shell version: 3.2.12
connecting to: 127.0.0.1:90109/test
shard1:PRIMARY> use admin
switched to db admin
shard1:PRIMARY> db.auth('abc','123');
1
shard1:PRIMARY> rs.status();
{
"set" : "shard1",
"date" : ISODate("2017-04-13T03:51:43.724Z"),
"myState" : 1,
"term" : NumberLong(15),
"heartbeatIntervalMillis" : NumberLong(2000),
"members" : [
{
"_id" : 0,
"name" : "192.168.1.11:90109",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 236595,
"optime" : {
"ts" : Timestamp(1491819707, 1),
"t" : NumberLong(15)
},
"optimeDate" : ISODate("2017-04-10T10:21:47Z"),
"electionTime" : Timestamp(1491819706, 1),
"electionDate" : ISODate("2017-04-10T10:21:46Z"),
"configVersion" : 1,
"self" : true
},
{
"_id" : 1,
"name" : "192.168.1.12:90109",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 235955,
"optime" : {
"ts" : Timestamp(1491819707, 1),
"t" : NumberLong(15)
},
"optimeDate" : ISODate("2017-04-10T10:21:47Z"),
"lastHeartbeat" : ISODate("2017-04-13T03:51:42.192Z"),
"lastHeartbeatRecv" : ISODate("2017-04-13T03:51:42.192Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "192.168.1.11:90109",
"configVersion" : 1
},
{
"_id" : 2,
"name" : "192.168.1.244:90109",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 235758,
"optime" : {
"ts" : Timestamp(1491819707, 1),
"t" : NumberLong(15)
},
"optimeDate" : ISODate("2017-04-10T10:21:47Z"),
"lastHeartbeat" : ISODate("2017-04-13T03:51:43.566Z"),
"lastHeartbeatRecv" : ISODate("2017-04-13T03:51:42.102Z"),
"pingMs" : NumberLong(239),
"configVersion" : 1
},
{
"_id" : 3,
"name" : "192.168.1.245:90109",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 235774,
"optime" : {
"ts" : Timestamp(1491819707, 1),
"t" : NumberLong(15)
},
"optimeDate" : ISODate("2017-04-10T10:21:47Z"),
"lastHeartbeat" : ISODate("2017-04-13T03:51:42.536Z"),
"lastHeartbeatRecv" : ISODate("2017-04-13T03:51:39.338Z"),
"pingMs" : NumberLong(8),
"configVersion" : 1
},
{
"_id" : 4,
"name" : "192.168.1.246:90109",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 235807,
"optime" : {
"ts" : Timestamp(1491819707, 1),
"t" : NumberLong(15)
},
"optimeDate" : ISODate("2017-04-10T10:21:47Z"),
"lastHeartbeat" : ISODate("2017-04-13T03:51:41.940Z"),
"lastHeartbeatRecv" : ISODate("2017-04-13T03:51:41.100Z"),
"pingMs" : NumberLong(12),
"configVersion" : 1
}
],
"ok" : 1
}
shard1:PRIMARY> rs.config();
{
"_id" : "shard1",
"version" : 1,
"protocolVersion" : NumberLong(1),
"members" : [
{
"_id" : 0,
"host" : "192.168.1.11:90109",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 2,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 1,
"host" : "192.168.1.12:90109",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "192.168.1.244:90109",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 3,
"host" : "192.168.1.245:90109",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 4,
"host" : "192.168.1.246:90109",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("58e4c9c3333c649c118771d5")
}
}
shard1:PRIMARY>
好了，聪明如你，知道了如何查看mongodb副本集的priority优先级，是不是很欢喜 _
还有其他问题的可以在评论区留言或者扫码加博主获取资源或者提问。
