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Experimental Feature Toggle: databaseReadReplica (#89232)

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This adds a version of the SQLStore that includes a ReadReplica. The primary DB can be accessed directly - from the caller's standpoint, there is no difference between the SQLStore and ReplStore unless they wish to explicitly call the ReadReplica() and use that for the DB sessions.

Currently only the stats service GetSystemStats and GetAdminStats are using the ReadReplica(); if it's misconfigured or if the databaseReadReplica feature flag is not turned on, it will fall back to the usual (SQLStore) behavior.

Testing requires a database and read replica - the replication should already be configured. I have been testing this locally with a docker mysql setup (https://medium.com/@vbabak/docker-mysql-master-slave-replication-setup-2ff553fceef2) and the following config:

[feature_toggles]
databaseReadReplica = true

[database]
type = mysql
name = grafana
user = grafana
password = password
host = 127.0.0.1:3306

[database_replica]
type = mysql
name = grafana
user = grafana
password = password
host = 127.0.0.1:3307
This commit is contained in:
Kristin Laemmert
2024-06-18 11:07:15 -04:00
committed by GitHub
parent 791bcd93df
commit 50244ed4a1
16 changed files with 272 additions and 23 deletions
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docs/sources/setup-grafana/configure-grafana/feature-toggles/index.md
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@@ -190,6 +190,7 @@ Experimental features might be changed or removed without prior notice.
| `alertingCentralAlertHistory` | Enables the new central alert history. |
| `azureMonitorPrometheusExemplars` | Allows configuration of Azure Monitor as a data source that can provide Prometheus exemplars |
| `pinNavItems` | Enables pinning of nav items |
| `databaseReadReplica` | Use a read replica for some database queries. |
## Development feature toggles