Re: [Ganglia-developers] repeated gmetad errors

[Bernard L. <be...@va...>]

Hi Daniel:

I'll have a look at this when I am back to work, but I think we should
have an open dialog with the rrdcached developers regarding this.  If
you are subscribed to rrd-developers, perhaps you can forward this
thread there as well?

Thanks,

Bernard

On Wed, Oct 1, 2008 at 9:15 AM,  <Dan...@ba...> wrote:
>
>
>
> While evaluating rrdcached, I've had a few occasions where rrdcached
> fails, and gmetad continues trying to use it.
>
> On a heavily loaded system, this easily creates many GB of entries in
> the log file:
>
> Sep 30 20:03:38 servername /apps/ganglia-3.1/sbin/gmetad[12368]:
> RRD_update (/.../swap_free.rrd): request: internal error while talking
> to rrdcached
>
> A few thoughts come to mind:
>
> - Maybe gmetad (or the RRD libraries) should be responsible for
> (re)starting the rrdcached process, or maybe rrdcached could be in a
> dynamic library that gmetad links with?
>
> - Maybe gmetad should stop and/or refuse to start if rrdcached is
> unavailable, bad socket permissions, etc?
>
> - If it is necessary for gmetad to keep running while rrdcached is down,
> then maybe there needs to be some mechanism for gmetad to avoid calling
> rrd_update(...) until it knows that rrdcached is back again.  Just
> logging an error on the first problem would be sufficient.
>
> Does anyone have any preferences for how this is dealt with?
>
> Regards,
>
> Daniel
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