CODEWITHSUNDEEP
mongodb
TeoVr81
TeoVr81

Reputation: 1009

Shutdown of a single MongoDB replica set member

I have a MongoDB database with 4 replica set members. I need to shutdown only one replica. If I execute this command:

db.shutdownServer()

when I'm connected with the replica member that I want to shutdown, can I be quiet that the other members continue to work?

Upvotes: 0

Views: 270

Answers (1)

R2D2
R2D2

Reputation: 10737

If you have 4x voting members and If you shutdown member that is SECONDARY , your PRIMARY will continue to be PRIMARY after you execute on the targeted SECONDARY:

 use admin
 db.shutdownServer()

P.S. This is in case you shutdown the member for a short time just for maintenance, in general 4x voting members allow only 1x member to be down at same time , if something happen with one more member you will have only 2 active voting members from 4 ( 50% < majority ) and PRIMARY will switch to SECONDARY. For long term better follow the recommended steps in the comment by @Alex Blex and remove the member.

 Total members     Allowed to be down at once(default voting config -> 1x vote each member )
 in replicaSet     and still keeping PRIMARY online 
    1                     0
    2                     0 
    3                     1
    4                     1
    5                     2
    6                     2
    7                     3

Also it is best to reconfigure member in advance to HIDDEN state before shutting it down to hide the member from the application and reduce issues during start later. If you just want to stop it for short time it is not recommended to remove it since it will take some time to init sync it later if you add it again.

Upvotes: 2

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