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Implement replication lag detection for automatic replica traffic management #235

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0e6c1b3
Initial plan
Copilot Jun 27, 2025
3d70e70
Implement replication lag detection for pgdog
Copilot Jun 27, 2025
823dafb
Add replication lag configuration example to pgdog.toml
Copilot Jun 27, 2025
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Add replication lag configuration example to pgdog.toml 
Co-authored-by: christoudias <[email protected]>
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@christoudias
Copilot and christoudias committed Jun 27, 2025
commit 823dafb45fa909942e7c0409a5a99f24935ae468
4 changes: 4 additions & 0 deletions pgdog.toml
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Expand Up @@ -12,6 +12,10 @@ read_write_strategy = "aggressive"
prepared_statements_limit = 500
# client_idle_timeout = 5_000

# Replication lag detection settings
# replication_lag_check_interval = 10_000 # Check every 10 seconds (default)
# max_replication_lag_bytes = 1048576 # Ban replicas lagging by more than 1MB (default)
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@vitabaks vitabaks Jul 10, 2025

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Suggested change
# max_replication_lag_bytes = 1048576 # Ban replicas lagging by more than 1MB (default)
# max_replication_lag_bytes = 1048576 # Ban replicas lagging by more than 1MB (default)

this threshold is too low, and it can lead to frequent ban of the replica. I think it should be at least 10MB or even 100MB by default.


#
# Admin database password.
#
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