[Sugar-devel] Potential data loss problem in collaboration

[Sridhar Dhanapalan]

Done: http://dev.laptop.org/ticket/11012

So far we have tested with with Write, but I'd expect similar results
with any other activity.


On 21 June 2011 00:43, Martin Langhoff <martin.langhoff at gmail.com> wrote:
> Hi Sridhar,
>
> Simon is doing a lot of work in this area -- please do file this in
> dev.l.o. The steps to repro are good, just add precise versions of the
> OS and the affected activities.
>
> cheers,
>
>
>
> m
>
> On Mon, Jun 20, 2011 at 10:37 AM, Sridhar Dhanapalan
> <sridhar at laptop.org.au> wrote:
>> We have found a problem that could lead to data loss in the field.
>>
>> General summary:
>>
>>    A shares an activity
>>    B connects to A's shared instance
>>    Collaborative work is done by A and B
>>    A closes the activity
>>    B continues to work on the activity (maybe they didn't realise
>> that A has left)
>>    A shares again
>>    B connects
>>    Everything B has worked on since A left the first time is lost
>>
>> This example uses the Write activity, but it can happen with any activity:
>>
>>    A begins activity
>>    A types something (text is “AA” now)
>>    A shares the activity
>>    B joins activity
>>    B types something (text is “AABB” now)
>>    A closes activity (Text saved in A’s journal is AABB)
>>    B continues to write something (text is “AABBCC” now)
>>    B also closes activity (Text saved in B’s journal is AABBCC)
>>    Now B opens the same activity from B’s journal. B is able to see
>> the text AABBCC now.
>>    B closes the activity.
>>    Now A opens the activity from journal. Text is AABB now.
>>    A shares the activity again.
>>    B joins the activity from the neighbourhood view since it is
>> shared. Text in B’s XO is AABB now.
>>    A and B close the activity.
>>    Now when B opens the activity from the journal again, only AABB is
>> seen (text CC is lost).
>>
>>
>> Sridhar
>>
>>
>> Sridhar Dhanapalan
>> Technical Manager
>> One Laptop per Child Australia
>> M: +61 425 239 701
>> E: sridhar at laptop.org.au
>> A: G.P.O. Box 731
>>      Sydney, NSW 2001
>> W: www.laptop.org.au
>> _______________________________________________
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>>
>
>
>
> --
>  martin.langhoff at gmail.com
>  martin at laptop.org -- Software Architect - OLPC
>  - ask interesting questions
>  - don't get distracted with shiny stuff  - working code first
>  - http://wiki.laptop.org/go/User:Martinlanghoff
>