[Gluster-users] glusterfs and glusterfsd process utilization extremely high

Dave Warren davew at hireahit.com
Thu Dec 18 23:12:06 UTC 2014

On 2014-12-18 05:39, Kyle Harris wrote:
> What happens when I have a site hosted on a gluster drive and a user 
> or link points to an incorrect URL on that site and thus to a file 
> that doesn't exist?  Obviously that would have to happen multiple 
> times in order to be a problem but on a busy site, the potential exist 
> for a denial of service.
> So my new question is this.  How can this be mitigated from gluster 
> such that missing files do not cause such an issue?

In the web server world this is actually very common, it's typical to 
have Apache/nginx configured in a "If this file exists, return it, 
otherwise send the query to the CMS for processing", resulting in a very 
high rate of hits for nonexistent files.

Many times multiple calls are made, first to the filesystem looking for 
the "file" itself, then to variations of a 
/www/wordpress/cache/www.example.com/something.html.gz then 
.../something.html and similar looking for pre-computed result pages 
before sending the request over to the PHP engine. Normally this is a 
very inexpensive set of checks.

Dave Warren

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