Semisynchronous Replication Monitoring-opracowanie

Semisynchronous Replication Monitoring
The plugins for the semisynchronous replication capability expose several system and status variables
that you can examine to determine its configuration and operational state.
The system variable reflect how semisynchronous replication is configured. To check their values, use
SHOW VARIABLES:
mysql SHOW VARIABLES LIKE 'rpl_semi_sync%';
The status variables enable you to monitor the operation of semisynchronous replication. To check
their values, use SHOW STATUS:
mysql SHOW STATUS LIKE 'Rpl_semi_sync%';
When the master switches between asynchronous or semisynchronous replication
due to commit-blocking timeout or a slave catching up, it sets the value of the
Rpl_semi_sync_master_status [611] status variable appropriately. Automatic fallback from
semisynchronous to asynchronous replication on the master means that it is possible for the
rpl_semi_sync_master_enabled [548] system variable to have a value of 1 on the master side
even when semisynchronous replication is in fact not operational at the moment. You can monitor the
Rpl_semi_sync_master_status [611] status variable to determine whether the master currently is
using asynchronous or semisynchronous replication.
To see how many semisynchronous slaves are connected, check
Rpl_semi_sync_master_clients [610].
The number of commits that have been acknowledged successfully or unsuccessfully
by slaves are indicated by the Rpl_semi_sync_master_yes_tx [612] and
Rpl_semi_sync_master_no_tx [611] variables.
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