Ability to pause reconcilation

AdheipSingh commented 3 years ago

While rolling new version of operators OR even updating CR's, there are times when we want to stop reconcilation and just check how k8s behaves. Can be N number of cases where a user wants to pause reconcilation and resume.
Currently in case a user needs to pause reconcilation, need to scale operator deployment down each time.
Druid operator can have an annotation druid.apache.org/pause-reconcilation: true, we can check for this annotation in reconcilation loop and just return nil in case it exists, maybe log and send event too :)
Can be called outside the deployDruid() or the start of deployDruid()
Further this can also be improved on pausing reconcilation on certain runtime.objects.

@himanshug @nishantmonu51

himanshug commented 3 years ago

AdheipSingh commented 3 years ago

nice ! wasn't aware of this. will check this out. can doc this in once confirmed its working :)

druid-io / druid-operator