Hi Ryan, All details are listed at https://bugs.launchpad.net/keystone/+bug/1332058
In short, memcache failover doesn't work as python-memcached doesn't have enough options for that. libmemcached and python-pylibmc have more settings for HA that was tested. -- Best regards, Sergii Golovatiuk, Skype #golserge IRC #holser On Wed, Aug 6, 2014 at 12:46 AM, Ryan Moe <[email protected]> wrote: > Hi Sergii, > > This sounds great. Can you elaborate on the specific behaviors you'd like > to set with libmemcached and how they will help our situation? > > Thanks, > Ryan > > > On Tue, Aug 5, 2014 at 4:42 AM, Sergii Golovatiuk < > [email protected]> wrote: > >> Hi Fuelers, >> >> While working on memcache HA issues I dug the problem, thus want to bring >> up to your attention. >> >> Currently, MOS services (keystone, horizon) uses python-memcached plugin. >> The plugin itself is not bad but lacks of features for High Availability. >> >> Firstly, it's not possible to specify how much time need to wait for an >> answer before marking server as down. Also there are no way to specify how >> often to check the server before bringing it back online. >> >> However, it's possible to use python-pylibmc which is wrapper over >> limemcached that has many options for tuning. So it requires slight >> modification >> 1. We need to package libmemcached and python-pylibmc and include to MOS >> 2. there should be additional option in keystone.conf > [cache] > >> backend_behavior which will allow operators to specify options for memcache >> backend. This requires a slight modification in keystone. >> 3. We should package django-pylibmc for horizon. That will allow >> horizon to use python-pylibmc >> 4. Modify Puppet manifest in order to configure keystone and horizon as >> well as to install all required packages. >> >> Once done, memcached related services will be more robust, allowing >> operators to tune settings for their needs. >> >> Feel free to share your thoughts how to make memcached related services >> HA ready. Thank you in advance. >> -- >> Best regards, >> Sergii Golovatiuk, >> Skype #golserge >> IRC #holser >> >> -- >> Mailing list: https://launchpad.net/~fuel-dev >> Post to : [email protected] >> Unsubscribe : https://launchpad.net/~fuel-dev >> More help : https://help.launchpad.net/ListHelp >> >> >
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