[horde] Activesync unexpected full sync

[Matthew Seymour]

Quoting Michael J Rubinsky <mrubinsk at horde.org>:

> Quoting Torben Dannhauer <torben at dannhauer.info>:
>
>>> Am 18.10.2017 um 17:29 schrieb Matthew Seymour <matt at fivesmallponies.com>:
>>>
>>>
>>> Hi folks,
>>>
>>> I'm continuing to have this problem. I've managed to capture the  
>>> issue with a smaller log file (only 300MB this time) but can't see  
>>> anything obvious. It looks as if the iOS device has difficulty  
>>> contacting the server, for some reason, then re-syncs everything.  
>>> So the activesync logs look fine, because they are. What I'm not  
>>> clear on is what might be causing this... it's also a guess as to  
>>> what's actually going on.
>>>
>>> Unfortunately this is making calendars unreliable so I'd love to  
>>> get to the bottom of this.
>>>
>>> Any pointers are welcome.
>>>
>>> Matt
>>>
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>>
>> Matthew,
>>
>> I have also the impression that the cendar sometimes resybcs and  
>> forgets so dates. I was unable to get logs of this since I always  
>> discoverey he missing appointments when I missed an event. I‘m very  
>> interested in your investigations!
>>
>> -> correction edit: oops lots of typos. I meant "I have also the  
>> impression that the calendar resyncs and forgets some dates"
>
> If it's strictly calendar data, might be related to parsing MAPI  
> data in meeting invitations coming from MS clients. Try installing  
> the bcmath php extension, which improves performance over PEAR's  
> (sometimes buggy) Math_BigInteger package.
>
>>
>> Torben

I have found a semi reliable way of causing this to fail. If I have  
two calendars synced via activesync and I move an entry between the  
calendars it all goes wrong. The move happens, then a full resync. I  
can find no errors in the activesync log though. I have experienced  
the problem without multiple calendars being synced, just wondered if  
this might give a clue as to what the problem is.

Matt