MDEV-26: Global transaction ID.

Fix things so that a master can switch with MASTER_GTID_POS=AUTO to a slave
that was previously running with log_slave_updates=0, by looking into the
slave replication state on the master when the slave requests something not
present in the binlog.

Be a bit more strict about what position the slave can ask for, to avoid some
easy-to-hit misconfiguration errors.

Start over with seq_no counter when RESET MASTER.

1 files changed, 3 insertions, 1 deletions

diff --git a/sql/rpl_gtid.h b/sql/rpl_gtid.h
index 003db657242..bdc88b5c2b5 100644
--- a/sql/rpl_gtid.h
+++ b/sql/rpl_gtid.h
@@ -89,6 +89,7 @@ struct rpl_slave_state
                       bool in_transaction);
   uint64 next_subid(uint32 domain_id);
   int tostring(String *dest, rpl_gtid *extra_gtids, uint32 num_extra);
+  bool domain_to_gtid(uint32 domain_id, rpl_gtid *out_gtid);
   int load(THD *thd, char *state_from_master, size_t len, bool reset);
   bool is_empty();
 
@@ -135,12 +136,13 @@ struct rpl_binlog_state
 
   void reset();
   int update(const struct rpl_gtid *gtid);
-  uint32 seq_no_from_state();
+  uint64 seq_no_from_state();
   int write_to_iocache(IO_CACHE *dest);
   int read_from_iocache(IO_CACHE *src);
   uint32 count();
   int get_gtid_list(rpl_gtid *gtid_list, uint32 list_size);
   int get_most_recent_gtid_list(rpl_gtid **list, uint32 *size);
+  rpl_gtid *find(uint32 domain_id, uint32 server_id);
 };