How to get znode ip

Question

I have many services connected to zookeeper, and I want that service A can get service B's IP, when service B connected to zookeeper, is there any API can do that? Or I have to use other config file to write down all services's IP?

Answer 1

Take a look if this solves your problem: http://curator.apache.org/curator-x-discovery/

Zookeeper doesn't provide service discovery out of the box, but it is easy to implement it yourself.

You won't be able to get the IP addresses of other connected clients (services, in your case) straight from the Zookeeper API. In order to get other services connected to the cluster, each service has to individually create an ephemeral znode under a specific path, eg /services, and set the necessary addressing and naming info as znode's data (IP, port, etc). This way, you can list that path and discover active services, or watch the /services path for any changes in your service configuration.

Since services are creating ephemeral nodes, they will automatically be removed once they are disconnected and their session expires. Of course, once you start doing something like this, you will see that there are many small details and design decisions you have to make, ergo the already mentioned Curator recipe.