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Currently it's possible to set gtid_domain_id or gtid_seq_no from inside a transaction.
If someone is doing such a strange thing, they most likely expect the change to take effect for the remaining part of the transaction; or, short of that, starting from the next transaction. In fact, the change will affect the whole current transaction.
It might be considered less of a user's strange behavior and more of a real problem if autocommit = 0 is used, and hence the user doesn't really do something stupid explicitly.
Changing variables that go to the binary log from inside a transaction is not unheard of, e.g. sql_mode can be modified several times, as it is written into the binlog with each statement. However, with gtid* it obviously makes no sense, so I suggest to forbid it at all (e.g. binlog_format cannot be changed inside a transaction).
Test case:
--source include/master-slave.inc
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--source include/have_innodb.inc
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set autocommit = 0;
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create table t1 (i int) engine=InnoDB;
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create table t2 (i int) engine=InnoDB;
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insert into t1 values (1);
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insert into t1 values (2);
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insert into t1 values (3);
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set gtid_domain_id=1;
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insert into t2 values (1);
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insert into t2 values (2);
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commit;
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show binlog events;
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Output:
Log_name Pos Event_type Server_id End_log_pos Info
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master-bin.000001 4 Format_desc 1 248 Server ver: 10.0.1-MariaDB-gcov-debug-log, Binlog ver: 4
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master-bin.000001 248 Gtid_list 1 273 []
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master-bin.000001 273 Binlog_checkpoint 1 313 master-bin.000001
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master-bin.000001 313 Gtid 1 351 GTID 0-1-1
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master-bin.000001 351 Query 1 451 use `test`; create table t1 (i int) engine=InnoDB
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master-bin.000001 451 Gtid 1 489 GTID 0-1-2
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master-bin.000001 489 Query 1 589 use `test`; create table t2 (i int) engine=InnoDB
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master-bin.000001 589 Gtid 1 627 BEGIN GTID 1-1-3
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master-bin.000001 627 Query 1 715 use `test`; insert into t1 values (1)
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master-bin.000001 715 Query 1 803 use `test`; insert into t1 values (2)
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master-bin.000001 803 Query 1 891 use `test`; insert into t1 values (3)
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master-bin.000001 891 Query 1 979 use `test`; insert into t2 values (1)
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master-bin.000001 979 Query 1 1067 use `test`; insert into t2 values (2)
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master-bin.000001 1067 Xid 1 1094 COMMIT /* xid=132 */
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