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Controls whether semisynchronous replication is enabled on the source server. To enable or disable the plugin, set this variable to ON  or OFF  (or 1 or 0), respectively. The default is OFF . 

This variable is available only if the source-side semisynchronous replication plugin is installed. 

• rpl_semi_sync_master_timeout 

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A value in milliseconds that controls how long the source waits on a commit for acknowledgment from a replica before timing out and reverting to asynchronous replication. The default value is 10000 (10 seconds). 

This variable is available only if the source-side semisynchronous replication plugin is installed. 

• rpl_semi_sync_master_trace_level 

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The semisynchronous replication debug trace level on the source server. Four levels are defined: 

•1 = general level (for example, time function failures) 

•16 = detail level (more verbose information) 

•32 = net wait level (more information about network waits) 

•64 = function level (information about function entry and exit) 

This variable is available only if the source-side semisynchronous replication plugin is installed. 

