openstack/kolla-ansible
Code Issues Proposed changes

Adds ability to configure ProxySQL's max replication lag

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By default ProxySQL's default value of max_replication_lag
is 0 which is in fact disabling this feature [1].
If it is greater than 0, ProxySQL will regularly monitor
replication lag and if it goes beyond the configured threshold
it will temporary shun the host until replication catches up.

This should be configurable via kolla-ansible as every
openstack deployment can be different in terms of network
delays, database load etc.. , so user should have option
to configure when database backend will be shunned.

[1] https://proxysql.com/documentation/main-runtime/

Change-Id: I66171638abc712cb84b380042f1d29f54c499e73
This commit is contained in:
Michal Arbet 2022-10-18 11:18:53 +02:00
parent 766a7827f9
commit bee253e337
3 changed files with 13 additions and 0 deletions
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1
ansible/roles/loadbalancer/defaults/main.yml
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@ -122,6 +122,7 @@ proxysql_workers: "{{ openstack_service_workers }}"
proxysql_max_connections: 40000
# The maximum number of connections to mariadb backends.
proxysql_backend_max_connections: 10000
proxysql_backend_max_replication_lag: "0"
proxysql_admin_user: "kolla-admin"
proxysql_stats_user: "kolla-stats"

1
ansible/roles/loadbalancer/templates/proxysql/proxysql.yaml.j2
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@ -33,6 +33,7 @@ mysql_servers:
port : {{ database_port }}
hostgroup : {{ WRITER_GROUP }}
max_connections: {{ proxysql_backend_max_connections }}
max_replication_lag: {{ proxysql_backend_max_replication_lag }}
weight : {{ WEIGHT }}
comment : "Writer {{ host }}"
{% endfor %}

11
releasenotes/notes/proxysql-conf-max-replication-lag-9c8f8f26cd92d66d.yaml Normal file
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@ -0,0 +1,11 @@
---
features:
- |
Adds ability to configure ProxySQL's max replication lag
via configuration value ``proxysql_backend_max_replication_lag``
which is set to default value as per documentation. If it is
greater than 0, ProxySQL will regularly monitor replication lag
and if it goes beyond the configured threshold it will temporary
shun the host until replication catches up. Please see the official
`upgrade notes <https://proxysql.com/documentation/main-runtime>`__
for more detail.