CODEWITHSUNDEEP
erlangschemadistributedmnesia
muehsi
muehsi

Reputation: 586

Erlang: How to remove node from Mnesia cluster

I am writing a distributed mnesia application and use a schema. When a new node joins the cluster, it is added to the mnesia schema by a rpc call (from the masternode which started the schema) which runs the following functions:

start_Mnesia(MasterNode) ->
    mnesia:start(),
    mnesia:change_config(extra_db_nodes, [MasterNode]),
    Tabs=mnesia:system_info(tables) -- [schema],
    [mnesia:add_table_copy(Tab, node(), ram_copies) || Tab <- Tabs].

When a node crashes or disconnects, the master node receives a nodedown event and the node should be removed from the cluster. How can I achieve this?

EDIT: I ended up with following solution: TabList is a list of all tables in my schema which my node is using.

mnesia:del_table_copy(TabList, Node)

Upvotes: 3

Views: 1209

Answers (1)

Greg
Greg

Reputation: 8340

This should do what you want. According to the documentations:

del_table_copy(Tab, Node) -> {aborted, R} | {atomic, ok}

Deletes the replica of table Tab at node Node. When the last replica is deleted with this function, the table disappears entirely.

This function can also be used to delete a replica of the table named schema. The Mnesia node is then removed. Notice that Mnesia must be stopped on the node first.

Upvotes: 1

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