Hello,
I have mnesia database which I want to change its node name, I have followed erlang official documentation and end up by this code which I run on :firstnode@host:
:mnesia.stop() :mnesia.start() Process.sleep(200) :mnesia.backup('backup.bup') change_node_name(:mnesia_backup, :firstnode@host, :secondnode@host, 'backup.bup', 'new_backup.bup') ########### defp change_node_name(mod, from, to, source, target) do switch = fn(node) when node == from -> to (node) when node == to -> throw({:error, :already_exists}) (node) -> node end convert = fn({:schema, :db_nodes, nodes}, acc) -> {[{:schema, :db_nodes, :lists.map(switch, nodes)}], acc} ({:schema, :version, version}, acc) -> {[{:schema, :version, version}], acc} ({:schema, :cookie, cookie}, acc) -> {[{:schema, :cookie, cookie}], acc} ({:schema, tab, create_list}, acc) -> keys = [:ram_copies, :disc_copies, :disc_only_copies] opt_switch = fn({key, val}) -> case :lists.member(key, keys) do true -> {key, :lists.map(switch, val)} false-> {key, val} end end {[{:schema, tab, :lists.map(opt_switch, create_list)}], acc} (other, acc) -> {[other], acc} end :mnesia.traverse_backup(source, mod, target, mod, convert, :switched) end And when trying to restore the new backend from :secondnode@host, the database still remote.
I did a lookup inside this code, the most important part is {:schema, :db_nodes, nodes} however this clause has never been matched, also (other, acc) has not matched, the only matched clause is {:schema, tab, create_list}, so any help please ? thank you.