Document how to gracefully remove a server from a cluster
@chipotle is already working on this.
Since Nov 20, 2015.
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Description
We don't have an explicit way for removing a server anymore.
https://github.com/rethinkdb/docs/issues/876 is about the case where a server fails and you want to "clean up" after it.
However there is a separate scenario, where you have a working server that you want to gracefully remove from the cluster, without interrupting availability or losing data.
Apart from the option to manually update all the documents in table_config to remove the server from all the replicas lists, there is also a second convenient way for removing a given server from all tables by removing the default tag, see https://github.com/rethinkdb/rethinkdb/issues/2873#issuecomment-157641498
This should be documented somewhere.
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