Questions about documented client limitations

I set up a 1.4.2 Beehive server so my boss could test it out, and then sent him the end user PDF. Since we're currently using Oracle Calendar standalone, we're primarily interested in testing the time management component of Beehive, and generally via CalDAV clients.
The End User guide mentions some pretty serious limitations, though. In particular
- only supporting up to 250 meetings per calendar. That's like one week for my boss. ;-)
- only being able to look one month back for meetings.
These two limitations alone severely hobble the product. Why the limitations, and are there plans to remove them?
Also, how do you do free/busy searches via a CalDAV client, like Sunbird?
How do you search for other users, to be able to schedule a meeting with them?
We're really interested in Beehive since it's claimed goal is to allow the use of open standards-based clients, but some of the limitations in the current offering are pretty severe. We're looking for some kind of confirmation that these issues are on the roadmap to be addressed.
Thanks,
Tim

Hi Tim,
Some comments inline
>
- only supporting up to 250 meetings per calendar. That's like one week for my boss. ;-)The doc isn't too descriptive, is it :)
The limitation is not a server limitation per se, but rather a self-imposed limit and it's on a per-client type basis.
Fundamentally, in testing it was found that while some caldav clients handle large numbers of meetings nicely other caldav clients don't do so well. Beehive therefore puts a (configurable) limit on the number of meetings returned to each caldav client type. Note that 'meeting' in this case includes all occurences of a meeting, so if for example you have 20 meetings that repeat every week for a year that's counted as "20" not "20x52" meetings.
I believe the restriction is higher for iCal on the Mac than e.g. sunbird and lightning. Also, as the clients improve their scalability and handling of large number of meetings then the default limits will be increased accordingly.
If you (or your boss) is missing meetings in e.g. sunbird, then please do contact oracle support and they'll explain how to increase that limit for your boss's client (for diagnosability purposes, they'll be missing "this week" rather than way out in the future). I don't know the latest testing results for e.g. lightning 0.9, but I suspect that 1000 is probably still too high.
Even with a pretty busy schedule, 250 meetings is quite a lot. The only time i've seen people hit it is when they have many years worth of non-repeating day events (so for example, ten years worth of holidays for multiple countries where christmas day is not "repeats yearly" but instead is 10 individual meetings/day events.
>
- only being able to look one month back for meetings.I don't believe that's true anymore. In previous releases the solution to the above issue was to limit the number of meetings returned by 'time period' rather than count. In the more recent releases it's limited by count instead. I'm looking right now at my calendar in lightning 0.9 for september last year and it looks pretty full (although june isn't very full...)
>
These two limitations alone severely hobble the product. Why the limitations, and are there plans to remove them?
Also, how do you do free/busy searches via a CalDAV client, like Sunbird?Click on the 'invite attendees' button in the 'new meeting' dialog. enter invitees' email addresses and the free/busy should complete automatically. There's also a 'search time slot' button that'll find mutually convenient times.
How do you search for other users, to be able to schedule a meeting with them?That's more tricky... if you use lightning then it'll pull the email addresses for auto-complete from your thunderbird addressbook. If you use iCal I believe it pulls from the mac address book. In Sunbird you have to know people's email addresses.
hope that helps.
regards,
Richard

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I wanted to provide some background on a project we are working on and provide some questions that hopefully someone can help answer.
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Well, this is kind of a complicated project and I am not going to lie I know we are asking to use SCCM in a way that it was not designed to be used.
Basically these clients are training machines that will be reconfigured potentially several times a day. Essentially when a program runs that reconfigures the machine it will trigger a hardware inventory. Custom information about the configuration will be
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Because of this requirement there may be multiple hardware inventories taken in a single day.
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each member of a group will naturally have about O(log N) directly connected neighbors in a group of N peers. the actual number is approximately 2 * log2 N + 13. groups have full transitive connectivity but are not necessarily fully meshed (where each member has a direct-neighbor connection to every other member). groups will typically be naturally fully meshed below about 17 members.
as you've supposed, a full mesh isn't scalable to 100-1000+ members, and there's no reliable way to maintain a full mesh with the existing ActionScript APIs anyway (you can't set a neighbor to be "permanent" in the ActionScript API). note that in a group operating normally, if an average member had 100 neighbors in the steady state, you would expect the group size to be about 2^43 =~ 9,000,000,000,000 (9 trillion) members. groups that large are unlikely.
if you want to send a short message to every member of the group, use NetGroup.post(). that disseminates a message through a group efficiently to each member, but not instantaneously. scalable distributed presence in a very large group is a complex problem. unfortunately, a naïve approach will not be scalable or efficient. i encourage you to search for "newscast" and other "graph diffusion" topics in the context of P2P to get a flavor for how you might approach this problem for very large groups (of like 1000+).
for smaller groups (of up to like 100ish) you can probably get by with having each member periodically posting a presence announcement to the group, and each member keeping track of the age of each announcement it hears, expiring ones after a reasonable timeout.
personally, i wouldn't leave the "everybody" group to do a 1:1 chat.

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