[erlang-questions] distributed application sync_nodes_mandatory circular dependency

[Ulf Wiger]

It's typical that you would have a circular dependency, if the nodes
are standby for each other. If you would like A to be able to continue
alone if B or C haven't appeared within the specified timeout, change
sync_nodes_mandatory to sync_nodes_optional.

BR,
Ulf W

2008/4/26 db <masterofquestions@REDACTED>:
> I am trying to setup distributed application on multiple erlang nodes
>  so that when one node goes down, control of the application then moved
>  to another node. What would the config file for node B and C look like
>  so that possibility to handle node down/rejoin situation?
>
>  According OTP documentation,http://erlang.org/doc/design_principles/part_frame.html,
>  section 9.2, where it mentions the following setup for distributed
>  application.  Content of node A config file, a.config is:
>
>  [{kernel,
>   [{distributed, [{myapp, 5000, [a@REDACTED, {b@REDACTED, c@REDACTED}]}]},
>    {sync_nodes_mandatory, [b@REDACTED, c@REDACTED]},
>    {sync_nodes_timeout, 5000}
>   ]
>   }
>  ].
>
>  Content of node B, config file, b.config is:
>  [{kernel,
>   [{distributed, [{myapp, 5000, [b@REDACTED, {a@REDACTED, c@REDACTED}]}]},
>    {sync_nodes_mandatory, [b@REDACTED, a@REDACTED]},
>    {sync_nodes_timeout, 5000}
>   ]
>   }
>  ].
>
>  Content of node C, config file, c.config is:
>
>  [{kernel,
>   [{distributed, [{myapp, 5000, [c@REDACTED, {a@REDACTED, b@REDACTED}]}]},
>    {sync_nodes_mandatory, [a@REDACTED, b@REDACTED]},
>    {sync_nodes_timeout, 5000}
>   ]
>   }
>  ].
>
>  I tried starting the nodes manually, meaning I can do one node at a
>  time.  Starting node A without starting node B or C won't work.
>  Basically, we have circular dependency.
>
>  --
>  rk
>
>  That which we persist in doing becomes easier for us to do; not that
>  the nature of the thing itself is changed, but that our power to do is
>  increased.
>  -Ralph Waldo Emerson
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