无法使用erlang中的spawn（Node，Fun）在远程节点上生成功能

Question

experimenting with distributed erlang, here's what I have:

 loop()->
    receive {From, ping} ->
            io:format("received ping from ~p~n", [From]),
            From ! pong,
            loop();
        {From, Fun} when is_function(Fun) ->
            io:format("executing function ~p received from ~p~n", [Fun, From]),
            From ! Fun(),
            loop()
    end.

    test_remote_node_can_execute_sent_clojure()->
        Pid = spawn(trecias, fun([])-> loop() end),
        Pid ! {self(), fun()-> erlang:nodes() end},
        receive Result -> 
            Result = [node()]
        after 300 ->
                  timeout
        end.

getting: Can not start erlang:apply,[#Fun<tests.1.123107452>,[]] on trecias

node I execute the test on runs on the same machine as the node 'trecias'. Both nodes can load same code.

Any ideas what is amiss?

Answer 1

In the spawn call, you've specified the node name as trecias , but you need to specify the full node name including the hostname, eg trecias@localhost .

Also, the function you pass to spawn/2 must take zero arguments, but the one in the code above takes one argument (and crashes if that argument isn't the empty list). Write it as fun() -> loop() end instead.

When spawning an anonymous function on a remote node, you also need to make sure that the module is loaded on both nodes, with the same version. Otherwise you'll get a badfun error.