Wow Thomas We will give a whirl
Regards On 20 October 2011 12:19, thomas bonfort <thomas.bonf...@gmail.com> wrote: > So, this discussion inspired me to completely rework the locking > mechanism in mapcache, to stop relying on file locks which have their > quirks on network filesystems. > I have tried using multiple apache instances configured to used a > SMB-mounted lock directory and hammered both instances on unseeded > identical area to force locking, and ended up with absolutely no > duplicate wms requests or failed requests for the clients. > The code is committed in trunk. Thanks for bringing this up, this > allowed me to really simplify the locking code and remove a lot of > unneeded stuff :) > > -- > thomas > > On Thu, Oct 20, 2011 at 17:08, Travis Kirstine <traviskirst...@gmail.com> > wrote: >> Andreas and Thomas >> >> Thanks for you responses, I have discussed this with some of our IT >> staff and they had similar solution as Andreas using gfs. Their >> comments are below: >> >> "I suspect this scheme is not reliable over NFS. The problem is the >> directory updates are not synchronized across multiple nodes. I had a >> similar issue with the IMAP E-mail protocol. Our workaround currently >> is to force each user to leverage a single server. >> >> Ref: >> http://wiki.dovecot.org/NFS >> >> Seems like there's some tweaks to disable directory attribute caching >> but this can trigger slower performance. >> Only workaround is to use GFS which I found to have it's own issues. " >> >> Regards >> >> >> >> On 20 October 2011 05:32, Eichner, Andreas - SID-NLKM >> <andreas.eich...@sid.sachsen.de> wrote: >>> >>> We use TileCache.py on two servers with the cache on an OCFS2 on a >>> shared LUN in the SAN. No known issues with that for now. Note: Spurious >>> stale lock files occurred already on a single machine. There seemed to >>> be issues with lots of requests and a very slow upstream server. I used >>> a cron job to delete lock files older than 5 minutes or so. >>> As Thomas noted, if the lock files are created on a shared filesystem >>> and you make sure the filesystem you use is able to lock files properly >>> (read the docs carefully!) there's no reason why it should not work. >>> >> _______________________________________________ >> mapserver-users mailing list >> mapserver-users@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/mapserver-users >> > _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
