This is Phase 3 of binlog server

Massimiliano Pinto Please add estimate

What would look nice is to get warning if semi-sync delay is not 3 times monitoring delay .

if this condition is true fetching of semi-sync status should be done by the monitoring . If the last monitoring semy-sync status was sync than we know that we did no lost an event on the old master and he can become a candidate slave

This would enable failover to work as a switchover if replication is not delayed more than 3 times monitoring delay

Current work is in:

https://github.com/mariadb-corporation/MaxScale/tree/MXS-213

In maxscale.cnf just put semisync=1

In the Master Server:

MySQL>INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';
MySQL> SET GLOBAL rpl_semi_sync_master_enabled = 1;

Check it:
MySQL> SHOW VARIABLES LIKE 'rpl_semi_sync_master_enabled';

Massimiliano Pintotturenko johan.wikman Which jira item covers the QA test cases for this feature ?

Also this was originally planned for 1.5 , not 1.4