Second iteration on PostgreSQL monitoring POC - Read-Only Support #4726
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Can one of the admins verify this patch? |
JavierJF
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retest this please |
This commit packs multiple fixes/improvements:
- Added READONLY support for PostgreSQL.
- Major rework for queries and statements used on monitoring checks:
+ Checks/Actions rewrote for single instance checks.
+ Reuse of prepared statements instance of re-preparation.
- Fixed missing error handling in connection creation state machine.
- Fixed connection rotation in connection pool (now FIFO).
- Added support for configurable batching in scheduler thread, via
'*_interval_window' variables. These variables allows to define the
burstiness of the scheduling within the processing interval.
- Added new config variable 'pgsql-monitor_dbname'. Allows to control
which 'db' will be target by monitoring connections.
- Several fixes for 'poll' timeout computation for worker threads.
- Fixed edge cases for current interval detection.
- Reduced deviation in scheduling intervals computation.
- Refactored and simplified connection event handling.
- Improved error messages for monitoring actions.
- Replaced several invalid uses of 'mysql_thread___monitor_*' in
favor or new 'mysql_thread___monitor_*' variables.
- Honor '-M' argument for disabling monitoring support.
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This PR packs multiple fixes/improvements:
'*_interval_window' variables. These variables allows to define the
burstiness of the scheduling within the processing interval.
which 'db' will be target by monitoring connections.
favor or new 'mysql_thread___monitor_' variables.
There are still a couple of missing points on the implementation, these are flagged as TODO in the code itself.