tag:blogger.com,1999:blog-2113389954677193299.post8174171200415731012..comments2008-12-03T09:22:53.224+01:00Lars Thalmannhttp://www.blogger.com/profile/04670086448620772049noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-2113389954677193299.post-81475383820362671222008-12-03T09:22:00.000+01:002008-12-03T09:22:00.000+01:00In the MySQL version, the slave will send a reply after the event has been written to the relay log.HE Zhenxinghttp://www.blogger.com/profile/07404130063309865613noreply@blogger.comtag:blogger.com,1999:blog-2113389954677193299.post-4530035758867588832008-11-25T00:15:00.000+01:002008-11-25T00:15:00.000+01:00In the Google version, the slave replied as soon as the IO thread received the event and that was before it wrote the event to the relay log. Has MySQL done something different? It would be nice if it gave the option to respond on receipt or after writing to the relay log.Mark Callaghanhttp://www.blogger.com/profile/09590445221922043181noreply@blogger.comtag:blogger.com,1999:blog-2113389954677193299.post-21836953422760272422008-11-25T00:07:00.000+01:002008-11-25T00:07:00.000+01:00Just to elaborate on what Zhenxing said: note that the semi-sync implementation acknowledges that the transaction has been written to the <I>relay log</I>, but not that it has been <I>applied to the slave</I>. This means that log-slave-updates does not affect the behavior of semi-sync at all, since this is executed in the SQL thread.Mats Kindahlhttp://www.blogger.com/profile/07528917029894926261noreply@blogger.comtag:blogger.com,1999:blog-2113389954677193299.post-51417377223735774222008-11-23T06:39:00.000+01:002008-11-23T06:39:00.000+01:00the main changes semi-synchronous replication brings in is to make the master to block the return of a transaction until it get a reply from one slave, the slave will reply on receipt of the events from master, so this feature should work fine with circular replication or any other kind of usages of replication currently supported.ZHENXINGhttp://www.blogger.com/profile/07404130063309865613noreply@blogger.comtag:blogger.com,1999:blog-2113389954677193299.post-53128491994961145892008-11-21T18:00:00.000+01:002008-11-21T18:00:00.000+01:00This is a great addition to replication, but I am curious, how does this work if the slave has log-slave-updates enabled? Is it compatible with a replication ring or master-master pair?Devananda vdvhttp://www.blogger.com/profile/03378341125039609409noreply@blogger.comtag:blogger.com,1999:blog-2113389954677193299.post-14934148569128742562008-11-21T17:13:00.000+01:002008-11-21T17:13:00.000+01:00This is great. The replication team at MySQL has quickly opened to the external developer community and this should benefit everyone. This includes their integration of features from us, publishing many previews and sharing design reviews.Mark Callaghanhttp://www.blogger.com/profile/09590445221922043181noreply@blogger.com