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Allow failover for replicas

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Jose Fernandez (magec)
2024-11-06 12:59:20 +01:00
parent 0ee59c0c40
commit 16a2cece21
6 changed files with 174 additions and 79 deletions
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README.md
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@@ -175,7 +175,7 @@ The setting will persist until it's changed again or the client disconnects.
By default, all queries are routed to the first available server; `default_role` setting controls this behavior.
### Failover
All servers are checked with a `;` (very fast) query before being given to a client. Additionally, the server health is monitored with every client query that it processes. If the server is not reachable, it will be banned and cannot serve any more transactions for the duration of the ban. The queries are routed to the remaining servers. If all servers become banned, the ban list is cleared: this is a safety precaution against false positives. The primary can never be banned.
All servers are checked with a `;` (very fast) query before being given to a client. Additionally, the server health is monitored with every client query that it processes. If the server is not reachable, it will be banned and cannot serve any more transactions for the duration of the ban. The queries are routed to the remaining servers. If `replica_to_primary_failover_enabled` is set to true and all replicas become banned, the query will be routed to the primary. If `replica_to_primary_failover_enabled` is false and all servers (replicas) become banned, the ban list is cleared: this is a safety precaution against false positives. The primary can never be banned.
The ban time can be changed with `ban_time`. The default is 60 seconds.