Zookeeper connection loss issue

ujalayadav
Participant I

We have two DC's , DC-1 and DC-2, DC-1 being main server and DC-2 being DR with both 9 node installation in our production environment. Both the DC's have 3 zookeeper nodes, one of the node as observer in DC-2. During the security update of these servers,we stopped our DC-1 components and proceeded with the security upgrade. During this time we saw zookeeper connection loss error in our router logs. We understandd zooKeeper observers cannot elect a new leader and the two remaining voters in DC-2 do not have a quorum of at least 3 voter nodes to elect a new leader. Thus, the ZooKeepers in DC-2 will not be able to process any requests. This happens during login and proxy deployment, that we understand but we are also seeing this during runtime proxy log. So, does the zookeper leader election is needed for runtime transactions also? Can there be any api which require zookeper during runtime transactions?

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