"+This variable controls how many replication events will be grouped together. Replication events are grouped in SQL slave thread by skipping events which may cause commit. This way the wsrep node acting in |MySQL| slave role and all other wsrep nodes in provider replication group, will see same (huge) transactions. This implementation is still experimental. This may help with the bottleneck of having only one |MySQL| slave facing commit time delay of synchronous provider."
Regarding
"+This variable controls how many replication events will be grouped together. Replication events are grouped in SQL slave thread by skipping events which may cause commit. This way the wsrep node acting in |MySQL| slave role and all other wsrep nodes in provider replication group, will see same (huge) transactions. This implementation is still experimental. This may help with the bottleneck of having only one |MySQL| slave facing commit time delay of synchronous provider."
for Bug #1170066
Has this been sourced from any codership docs?