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Co-authored-by: Israel <[email protected]>
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Alexander Kukushkin
2023-07-21 11:38:33 +02:00
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co-authored by Israel
parent 893e460695
commit 2e9b6b21de
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docs/replication_modes.rst
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@@ -72,9 +72,9 @@ The parameter ``synchronous_node_count`` is used by Patroni to manage number of
Maximum lag on synchronous node
===============================
By default Patroni sticks to a node that is declared as ``synchronous``, according to the setting ``pg_stat_replication``, even when there are other nodes ahead of it. This is done to minimize the number of changes of ``synchronous_standby_names``. To change this behavior one may use ``maximum_lag_on_syncnode`` parameter. It controls how much lag the replica can have to still be considered as "synchronous".
By default Patroni sticks to a node that is declared as ``synchronous``, according to the ``pg_stat_replication`` view, even when there are other nodes ahead of it. This is done to minimize the number of changes of ``synchronous_standby_names``. To change this behavior one may use ``maximum_lag_on_syncnode`` parameter. It controls how much lag the replica can have to still be considered as "synchronous".
Patroni utilizes the max replica LSN if there is more than one standby, otherwise it will use leader's current wal LSN. The default is ``-1``, and Patroni will not take action to swap a synchronous unhealthy standby when the value is set to 0 or below. Please set the value high enough so that Patroni won't swap synchronous standbys frequently during high transaction volume.
Patroni utilizes the max replica LSN if there is more than one standby, otherwise it will use leader's current wal LSN. The default is ``-1``, and Patroni will not take action to swap a synchronous unhealthy standby when the value is set to ``0`` or less. Please set the value high enough so that Patroni won't swap synchronous standbys frequently during high transaction volume.
Synchronous mode implementation