How MongoDB modifies the priority value of a replica set node
This article mainly introduces how MongoDB modifies the priority value of the replica set node, which is very detailed and has certain reference value. Friends who are interested must read it!
The priority of the replication set node affects the results of the elections. We can improve the possibility of some nodes becoming master nodes by setting different priorities, and we can also prevent some nodes from becoming master nodes.
The specific settings are as follows:
Log in to the main node:
Test:PRIMARY > cfg = rs.conf ()
{
"_ id": "test"
"version": 4
"protocolVersion": NumberLong (1)
"members": [
{
"_ id": 0
"host": "192.168.0.51 purl 27017"
"arbiterOnly": false
"buildIndexes": true
"hidden": false
"priority": 1
"tags": {
}
"slaveDelay": NumberLong (0)
"votes": 1
}
{
"_ id": 1
"host": "192.168.0.52 purl 27017"
"arbiterOnly": false
"buildIndexes": true
"hidden": false
"priority": 1
"tags": {
}
"slaveDelay": NumberLong (0)
"votes": 1
}
{
"_ id": 2
"host": "192.168.0.53 virtual 27017"
"arbiterOnly": false
"buildIndexes": true
"hidden": false
"priority": 1
"tags": {
}
"slaveDelay": NumberLong (0)
"votes": 1
}
{
"_ id": 3
"host": "192.168.0.52 purl 27019"
"arbiterOnly": true
"buildIndexes": true
"hidden": false
"priority": 1
"tags": {
}
"slaveDelay": NumberLong (0)
"votes": 1
}
]
"settings": {
"chainingAllowed": true
"heartbeatIntervalMillis": 2000
"heartbeatTimeoutSecs": 10
"electionTimeoutMillis": 10000
"catchUpTimeoutMillis": 60000
"getLastErrorModes": {
}
"getLastErrorDefaults": {
"w": 1
"wtimeout": 0
}
"replicaSetId": ObjectId ("5a94ff92bf8f7ba59f48e552")
}
}
Modify the node priority value:
Test:PRIMARY > cfg.members [0] .priority = 1
one
Test:PRIMARY > cfg.members [0] .priority = 3
three
Test:PRIMARY > cfg.members [1] .priority = 2
two
Test:PRIMARY > cfg.members [2] .priority = 1
one
Apply configuration:
Test:PRIMARY > rs.reconfig (cfg)
{"ok": 1}
Test:PRIMARY >
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