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Hi Kristian,
Your description is not accurate. If there are no slaves ready to acknowledge a transaction, after a timeout the status variable Rpl_semi_sync_master_clients in the master becomes 0. The master itself, though, remains able to perform semi-synch operations. As soon as one of the slaves is enabled, the variable Rpl_semi_sync_master_clients is incremented and semi-synch replication resumes.
HTH

Giuseppe


On 28 Dec 2015 at 13:17:10 , Kristian Nielsen (knielsen@xxxxxxxxxxxxxxx) wrote:
Hi Jonas (or anyone else who may know), 

If I understand correctly, semisync replication has a timeout for how long 
it will wait for a slave to acknowledge transactions. If the timeout is 
exceeded, semisync is turned off on the master. 

Do you know if there is a facility to avoid semisync being turned off 
automatically in this case, maybe instead fail and roll back the master 
transaction? 

I was thinking at Google you might already have needed and implemented this 
(merged or not merged into MariaDB yet), or you may be aware of a patch by 
someone else for this? 

Thanks, and merry Christmas! 

- Kristian. 

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