Comment 4 for bug 1228304

Raghu, if I may, I'd like to put forth a proposition, that this should not be considered PXC or SST-related problem. And you should not look much at rsync SST.

xtrabackup promise is that it backs up the server. Implying that if you start mysqld on the resulting datadir, it will be an exact copy of the source at some point in time. This is a requirement for PITR for example. And exact copy means that all the necessary gtids should be there as well, not just innodb tablespace. And if MySQL insists on storing this data in the binlog file, then it looks like xtrabackup has no choice but to mimic this somehow. Be it a file copy or be it a forged binlog file. Once xtrabackup can make such backup, all the problems will be saved.