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Older master has no GTID events, so such events are not available for deciding on scheduling of event groups and so on. With this patch, we run such events from old masters single-threaded, in the sql driver thread. This seems better than trying to make the parallel code handle the data from older masters; while possible, this would require a lot of testing (as well as possibly some extra overhead in the scheduling of events), which hardly seems worthwhile.
27 lines
721 B
Text
27 lines
721 B
Text
include/master-slave.inc
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[connection master]
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include/stop_slave.inc
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include/rpl_stop_server.inc [server_number=1]
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include/rpl_start_server.inc [server_number=1]
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SET @old_parallel= @@GLOBAL.slave_parallel_threads;
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SET GLOBAL slave_parallel_threads=10;
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CHANGE MASTER TO master_host='127.0.0.1', master_port=SERVER_MYPORT_1, master_user='root', master_log_file='master-bin.000001', master_log_pos=4;
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include/start_slave.inc
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CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
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INSERT INTO t2 VALUES (1);
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SELECT * FROM t1 ORDER BY a;
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a b
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1 1
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2 2
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3 4
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4 8
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5 16
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SELECT * FROM t2;
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a
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1
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include/stop_slave.inc
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SET GLOBAL slave_parallel_threads=@old_parallel;
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DROP TABLE t1;
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include/start_slave.inc
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DROP TABLE t2;
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include/rpl_end.inc
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