[Gluster-devel] lookup caching

[Gordan Bobic]

On 02/04/2010 14:49, Stephan von Krawczynski wrote:

>>> Following to a recent talk on the IRC channel, it came to my mind that
>>> caching lookups could (in this particular situation) greatly improve the
>>> performances.
>>
>> Maybe some of the devs can explain whether this is plausible, but I
>> somewhat doubt it. You would lose the integrity guarantees.
>
> If you're talking of data integrity here I doubt that it is there at all.
> Yesterday I checked a configuration with 2.0.9 replication and 3 clients with
> iocache. I found out that if I edit an ascii file on one client and save it
> back being the same size as before, another client still sees the old file
> content. I checked the servers and found that they all contained the correct
> new file version. So the data integrity is broken anyway when using iocache on
> clients

That is quite worrying.

Gordan