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I think the limit is <2mb. We could have a blend of consul + some data backend to store large data files. But I am sceptical as we have to actually understand the config that we are going to store.

The thing is, we have a usecase where we allow a hook or a watcher on a particular entry in a configuration, which makes storing configuration as bytes (json or ini stored as simple bytes in consul) not feasible.

Although, thank you so much for giving a plus point to add in an internal discussion on zookeeper vs etcd vs consul.

The mention of hooks brings another feature from Consul: Consul events and watches, which lets you send custom events (basically anything, just a string, with some filtering data if you want to restrict the audience), which would be received by whatever process which registered for it using Consul watch APIs. It's really a black-box messaging leveraging Consul gossips for your own custom use cases (btw, Consul also work across region and datacenter, if you have any hybrid or multi-region setup). I never had much use for it, (which is why I forgot about it until I read your mention for watchers)