Pavel Ivanov <pivanof@google.com> writes:
Thanks for the pointers, Kristian. It turned out that it was an incorrect merge of GTID-related changes into 10.0.1 tree. In particular I didn't quite understand the meaning of LINE_FOR_FIRST_MYSQL_5_6 in sql/rpl_mi.cc and thus left it at the value of 19. Because of that every time when master.info was read slave didn't see the value of using_gtid variable and didn't purge relay logs. Now I've got this fixed for us.
Ok, good that you got it tracked down.
BTW, while debugging I've noticed that master.info file wasn't properly truncated when it was re-written. I always saw some left-over text after the line "using_gtid=1". After finish of rpl.rpl_gtid_crash it could be even several lines of extra text with one more line "using_gtid=1" at the end. So probably you will want to fix this at some point...
Ah, good catch, I'll get it fixed. - Kristian.