[Openais] PATCH: aisexec leak & corruption (whitetank & trunk)(retry)

[Fabien THOMAS]

It is a very simple scenario to reproduce the problem:

on first node run aisexec.
on the same node run a client that do:
init
open
iterate
close
finalize

on another node run aisexec:
	recovery process is launched on the first node (that have all the  
information locally)
	=> internal structure is corrupted if the recovery happened during  
the iterate process

what is really strange to me is why do we need to create new  
checkpoint on a node that is the origin of the information?
why it is not possible to link the new checkpoint structure  to  
current iterators by name ?

sorry if its a dumb question but i'm not aware of all the operations  
done in aisexec.

Le 29 août 06 à 16:53, Muni Bajpai a écrit :

> So iteration at this point cannot survive a recovery process  
> because the iterator has references to the sections which are not  
> valid once recovery happens. Now recovery has no clue of these  
> references and hence cannot update them.
>
> What I propose is that we re - initialize the iterator after a  
> recovery to update the references. What this means is that any  
> current iteration would have to be restarted. I might be able to  
> get around that but that is the worst case scenario.
>
> - Muni
>
> - Muni----- Original Message ----- From: "Fabien THOMAS"  
> <fabien.thomas at netasq.com>
> To: <openais at lists.osdl.org>
> Cc: "Muni Bajpai" <muniba at nortel.com>
> Sent: Tuesday, August 29, 2006 5:18 AM
> Subject: Re: [Openais] PATCH: aisexec leak & corruption (whitetank  
> & trunk)(retry)
>
>
>> There is one remaining problem but i cannot find the reason:
>> during checkpoint recovery it seems that the structure is corrupted
>> (the full log is attached to my previous post).
>>
>
> Maybe i've an idea here:
>
> iteration_entry contain pointer to checkpoint section and it seems
> that the recovery process does not update the pointer to the new
> section list address.
> can you confirm ?
>
>
> fabien
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