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Implement sync_priority tag (#3223)

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Polina Bungina
2024-12-10 14:57:47 +01:00
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parent 46e20edbc2
commit 39f5de2e77
15 changed files with 176 additions and 82 deletions
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docs/yaml_configuration.rst
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@@ -401,8 +401,9 @@ Tags
- **noloadbalance**: ``true`` or ``false``. If set to ``true`` the node will return HTTP Status Code 503 for the ``GET /replica`` REST API health-check and therefore will be excluded from the load-balancing. Defaults to ``false``.
- **replicatefrom**: The name of another replica to replicate from. Used to support cascading replication.
- **nosync**: ``true`` or ``false``. If set to ``true`` the node will never be selected as a synchronous replica.
- **sync_priority**: integer, controls the priority this node should have during synchronous replica selection when ``synchronous_mode`` is set to ``on``. Nodes with higher priority will be preferred over lower-priority nodes. If the ``sync_priority`` is 0 or negative - such node is not allowed to be written to ``synchronous_standby_names`` PostgreSQL parameter (similar to ``nosync: true``). Keep in mind, that this parameter has the opposite meaning to ``sync_priority`` value reported in ``pg_stat_replication`` view.
- **nofailover**: ``true`` or ``false``, controls whether this node is allowed to participate in the leader race and become a leader. Defaults to ``false``, meaning this node _can_ participate in leader races.
- **failover_priority**: integer, controls the priority that this node should have during failover. Nodes with higher priority will be preferred over lower priority nodes if they received/replayed the same amount of WAL. However, nodes with higher values of receive/replay LSN are preferred regardless of their priority. If the ``failover_priority`` is 0 or negative - such node is not allowed to participate in the leader race and to become a leader (similar to ``nofailover: true``).
- **failover_priority**: integer, controls the priority this node should have during failover. Nodes with higher priority will be preferred over lower-priority nodes if they received/replayed the same amount of WAL. However, nodes with higher values of receive/replay LSN are preferred regardless of their priority. If the ``failover_priority`` is 0 or negative - such node is not allowed to participate in the leader race and to become a leader (similar to ``nofailover: true``).
- **nostream**: ``true`` or ``false``. If set to ``true`` the node will not use replication protocol to stream WAL. It will rely instead on archive recovery (if ``restore_command`` is configured) and ``pg_wal``/``pg_xlog`` polling. It also disables copying and synchronization of permanent logical replication slots on the node itself and all its cascading replicas. Setting this tag on primary node has no effect.
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