[Gluster-devel] Distributed Caching Translator

Erik Osterman e at osterman.com
Wed May 9 06:10:27 UTC 2007

Ah, yes indeed, I did notice that, though not much discussion on it yet, 
probably because it's still far off. I assumed that would be simply a 
local file cache, which wouldn't necessarily alleviate the load on the 
glusterfsd servers for large configurations, situations were lots of 
small files change frequently, and would be subject to the amount of 
available memory on each glusterfs client.


Erik Osterman

Anand Avati wrote:
> Erik,
>  there is a file-cache translator in the roadmap which has ideas
> similar to what you are talking about. the intial idea about that is
> to only cache file content.
> avati
> 2007/5/9, Erik Osterman <e at osterman.com>:
>> What I love about GlusterFS more than anything, is it's ease of use to
>> setup, especially on the client side. Install the binary and you're
>> done. Scaling the storage is also relatively convenient (even more so
>> with upcomming the 1.4 release). But sometimes you don't need to scale
>> storage as much as you just need to scale to handle a large volume of
>> requests. In such a case, it's unnecessary to disrupt the cluster to add
>> in another node, especially if you will just bring that node down in a
>> few hours anyways. In such a case, it would be more convenient to add in
>> caching nodes.
>> My random thought is to introduce a Memcache translator (not sure if
>> that's the correct term) that would work along the lines of CacheFS.
>> Writes would be mirrored like in AFR, once to the cluster another to the
>> Memcache pool. Clients could attempt to read first from the Memcache
>> servers or based on some formula, e.g 65% of the time. The size of files
>> stored would be configurable, e.g. only if less than 50K bytes. Stat
>> caching could also be extended to utilize Memcache as well.
>> What are your thoughts on this?
>> Best,
>> Erik Osterman
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