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Hello,



I am looking to improve the database load distribution and one of the things that may help with this is to spread out the reads.
>From the configuration reference it looks like neutron dues support a slave_connection parameter but when I enabled it and enabled query logging on the secondary databases there aren't any queries being executed on the secondaries. Is there anything I am missing ?

Sorry for CC'ing the dev list as well but someone in the dev teams may have an answer from a developer point of view.


My setup is like this:

Openstack stable/mitaka (built from git)
3 galera nodes
1 haproxy running on each node with active/backup with local node as single active configuration for the frontend listening on :3306 and active/backup with the other nodes as active for the frontend listening on :3308

In neutron.conf in the [database] section I set up the the connection and slave_connection parameters like this:

[database]
connection = mysql+pymysql://neutron:XXXXXXX@neutron-db.service:3306/neutron?charset=utf8
slave_connection = mysql+pymysql://neutron: XXXXXXX at neutron-db.service:3308/neutron?charset=utf8
idle_timeout = 1800
max_retries = -1
retry_interval = 5
min_pool_size = 8
max_pool_size = 32
max_overflow = 16


Loooking on a slave it opens a single connection which is eventually closed because of lack of activity.


Thanks,
Cristian

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