Add support for a quorum when performing election
Closed this issue · 10 comments
It would be nice for repmgrd to have the option to perform a failover only if there's a quorum of nodes participating in the election run.
It is possible to script this through the validation hook but this increases the failover time - and repmgrd already has the knowledge of which nodes participated in the election.
I plan to send a patch to add more parameters to the failover_validation_command, such as total number of nodes sharing the current primary and nodes that participated in the election.
This way a check like this can be implemented in the failover_validation_command without extra processing, while the change would be backwards compatible with any repmgr installation due to using new parameters.
Ian, do you agree with this approach ?
Ian, do you agree with this approach ?
Seems reasonable, patch welcome :).
Thanks, will look at it, though might take a few days due to other commitments.
No worries, the patch is rather simple/mechanical - grouping the current election counts in a struct, adding the total numbers of nodes to it and passing it down the failover validation command.
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Hi, yes am aware of this, per previous comment currently have other commitments so might be a few more days before I get to this.
Any updates ?
Resolving this one, basic quorum check is already available in repmgr and more complex ones can be implemented through the newly-added parameters in the failover validation command.