Re: [pbs-devel] applied: [PATCH proxmox-backup] Revert "fix #5710: api: backup: stat known chunks on backup finish"

[Christian Ebner <c.ebner@proxmox.com>]

On 1/13/25 13:48, Fabian Grünbichler wrote:
> On January 13, 2025 11:47 am, Christian Ebner wrote:
>> On 1/13/25 11:36, Fabian Grünbichler wrote:
>>> we should probably spec out some potential replacement approaches?
>>
>> Agreed, but I would nevertheless argue for reverting this for the time
>> being: a new approach will not use the same logic. What do you suggest?
> 
> yes, the revert is already applied now :)
> 
> we discussed some potential approaches internally a few weeks back, IIRC
> some potential mechanisms:
> 
> A) actively mark all snapshots referencing a certain chunk as corrupt
> when we detect the chunk corruption probably needs to be combined with
> some sort of reverse-map from chunk to list of snapshots to scale.
> 
> 
> B) mark all snapshots in the chain after the corruption as potentially
> corrupt (new state) and incorporate that into the reverify logic to
> detect other snapshots with a high likelihood of being affected quickly
> 
> C) notify active backup writers of chunks or snapshots being marked as
> corrupt. chunks can be cross-referenced at the end with re-used chunks,
> snapshots could trigger stat logic similar to the one we just reverted
> in case the snapshot is in the same group as the backup writer
> 
> D) ..?

Thanks!

I did update the issue in the bugtracker accordingly and linked to your 
suggestions for reference, will have a closer look at how to approach 
this once again.


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