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Do not unban replicas if a primary is available (#843)

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Add `unban_replicas_when_all_banned` to control unbanning replicas behavior.
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Jose Fernández
2024-11-07 18:11:11 +01:00
committed by GitHub
parent f27dc6b483
commit cdcfa99fb9
5 changed files with 26 additions and 2 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 all servers become banned, the behavior is controlled by the configuration parameter `unban_replicas_when_all_banned`. If it is set to true (the default), the ban list is cleared: this is a safety precaution against false positives, if it is set to false, no replicas will be available until they become healthy. The primary can never be banned.
The ban time can be changed with `ban_time`. The default is 60 seconds.