On Thu, Jul 16, 2009 at 2:02 PM, Fabian Groffen <Fabian.Groffen@cwi.nl> wrote:

On 16-07-2009 12:23:21 -0500, Ross Bates wrote:
> Trying to get Merovingian to act as a front end to MonetDB cluster.
> When I start the Mero service this shows up in the log.
>
> 2009-07-16 11:28:10 ERR merovingian[2276]: HELO message: error while
> sending message: Network is unreachable
> 2009-07-16 11:28:10 ERR merovingian[2276]: ANNC message: error while
> sending message: Network is unreachable
>
> I can connect back and forth between the two Mero/Monet instances using
> mclient --lsql, but for some reason the instances of Mero can't
> discover eachother.
>
> I think Mero is using UDP which could be contributing to the issue. Any
> tips for troubleshooting Mero connectivity over UDP?

Indeed, discovery is done using UDP. I did change some things in the
current development version of MonetDB, which might solve this problem,
but I'm not sure. Normally, the "Network is unreachable" message
indicates a routing table problem.

> Related to this, is there anyway I can just tell one instance of Mero
> about the other without auto discovery and proxy that way?

There is a feature request [1] for that because some nodes may be located
where normal broadcasting won't go.

[1] https://sourceforge.net/tracker/?func=detail&aid=2801350&group_id=56967&atid=482471

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