Advanced Topics - Leader Election in case of multiple replicas triggered for High Availability purposes

[antaloala]

I think it would be good to add, to the Leader election section, the use-case about running several instance of the custom controller workload/pod (i.e., only one being 'active') in order to increase the High Availability characteristics of your operator's controller (so the operator deployer has higher control on how fast a "blocked" currently 'active' controller instance is being replaced by another running (but not yet 'active') instance.

Adding this HA related use-case to the one currently described (related to a Deployment upgrade where new and old pod instance are running in parallel) would better show where this leader election support from Operator SDK can be used.

[varshaprasad96]

@antaloala Thanks for raising this issue. Though every operator need not be HA enabled, having documentation on this use case would be helpful. Would you be open to submitting a PR for this?

[AHB102]

I am new to open source, can I have a go at this ? I don't exactly know what is going on in the issue, but would love to contribute.

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