[Rpm-maint] [PATCH] RPMDB Performance

Florian Festi ffesti at redhat.com
Tue Aug 11 11:33:23 UTC 2009


On 08/11/2009 12:47 PM, devzero2000 wrote:
> On Tue, Aug 11, 2009 at 12:19 PM, Florian Festi<ffesti at redhat.com 
> <mailto:ffesti at redhat.com>> wrote:
> > Any thoughts or safety concerns?
> Beware of data loss with ext4 dropping down fsync
> http://www.h-online.com/open/Ext4-data-loss-explanations-and-workarounds--/news/112892
> The problem with ext4, XFS, or another extent-based filesystem is 
> inherent in their design, afaik.
>
As far as I understand the described problem does not directly affect 
this patch as there is no "rename" done. Of course dropping the fsyncs 
for the indexes may lead to a corruption of the indexes and the db 
environment. But both can be recovered as described on 
http://www.rpm.org/wiki/Docs/RpmRecovery. Omitting the fsyncs can also 
just lead to additional damage if there is a power loss or any other 
hard disruption of the OS. So the risk is comparably limited if I didn't 
miss something else.

Florian


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