From kde-pim  Sun Feb 05 08:43:08 2012
From: Del <delonly () gmail ! com>
Date: Sun, 05 Feb 2012 08:43:08 +0000
To: kde-pim
Subject: Re: [Kde-pim] Problem with bulk fetching of items with 4.8
Message-Id: <1701877.pm78fTdRy6 () merom>
X-MARC-Message: https://marc.info/?l=kde-pim&m=132843161121167

Hello Shaheed,

On Saturday, February 04, 2012 10:00:47 PM Shaheed Haque wrote:
> The piece you are missing is the amount of data, and the speed with
> which it can be fetched. On my system, I can fetch about 500 items
> every 50 seconds, and there are about 500k items to fetch, so a full
> download takes ~50k seconds or about 14 hours.

That performance looks quite good to me. Few companies will have larger 
address books. It will be interesting to hear how well akonadi and nepomuk 
scales to that amount of items.

> I have this design in mind...
> 
> 1. When I start fetching the collection, I will note the starting time
> using a collection attribute to persist the information (in case of
> needing to restart the machine).
> 
> 2. I have an incremental fetch phase during which I fetch data in
> batches (of 500 items). After each batch, I "bookmark" where I got to.
> If I shutdown my machine, on restart, I resume the fetch using the
> bookmark.
> 
> 3. When I get to the end (I've never actually managed to get to that
> point yet!), I hope to delete all the items with a creation date prior
> to the recorded start time.
> 
> I hope that make sense? Anyway, it is the query for this last part
> that I am stuck on - or some other better idea!

Your scheme looks good to me. As I understand, it is necessary  to fetch all 
items for every sync regardless of how you design it, due limited query 
capabilities for the Global address list in Exchange. Do you know how Outlook 
handles this issue?

I am a bit concerned how it will work out on the client side. How often will 
akonadi attempt to sync the Global address list? I imagine that most clients 
would not want as frequent synchronisation of the Global address list as for 
the other data.

I hope to get the time to test the Akonadi Exchange synchronisation the coming 
weeks. I will need to compile for RHEL6. I am not sure how much of a hassle it 
is getting up-to-date kde-pim built and running on it, so pointers to 
documentation is appreciated.

Thanks for your efforts!
Del
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