[ZODB-Dev] RE: xron and zeo -- follow-up question

[Loren Stafford]

I won't attempt to address the full question about versioned mirroring,
since I haven't even used ZEO yet.

As far as scheduled trigging of methods on specific clients...

...if you had a ZEO-aware Xron running anywhere in the "ZEO cluster", you
could write one or more Xron-scheduled methods that execute (via any kind of
RPC) other methods on specific ZEO clients. I think that would satisfy all
your scheduling requirements.

You would embed in your scheduled methods the knowlege of what clients exist
and how to address them.

-- Loren

> -----Original Message-----
> From: Joseph Wayne Norton [mailto:norton@alum.mit.edu]
> Sent: Thursday, April 12, 2001 08:07
> To: lstafford@morphics.com; zodb-dev@zope.org
> Subject: xron and zeo -- follow-up question
>
>
>
> Loren et al -
>
> I was browsing through the zodb-dev mailing list and the thread
> regarding xron and zeo sparked my interest.  I have a need for the
> following xron-like features:
>
>  - a daemon runnning in the background periodically (or
>  based on a schedule) triggers a method to be executed on all zope
>  server clients sharing the same zeo server.
>
>  - a method is executed manually on a single zope client.  the
>  completion of this method optionally schedules the same method to be
>  executed on all of the remaining zope server clients sharing the same
>  zeo server.
>
>  - if possible, triggered methods would be executed under a specified
>  zope version or under the same zope version as the first executed
>  method.
>
> My goal is to maintain a mirror of some of the objects in the zeo
> storage server on the local file system for each zope server client
> and under some circumstances allow different versions of the same
> object to be mirrored as well.  My idea is to use a single zope server
> in the zeo cluster (is this the right terminology) for
> modifying/testing content and to then mirror the content to each of
> the zope server client's local file system.  My initial thought is to
> use the fsdump and xron product to do such a thing.
>
> I'm curious if these features could be implemented via zeo/xron or if
> you have any other suggestions on a better way to implement such
> features.
>
> regards,
>
> - joe n.
>
>