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fe3b1c8e25
log-slave-updates and circul repl Slave SQL thread may execute one extra event when there are events skipped by slave I/O thread (e.g. originated by the same server). Whereas it was requested not to do so by the UNTIL condition. This happens because we compare with the end position of previously executed event. This is fine when there are no skipped by slave I/O thread events, as end position of previous event equals to start position of to be executed event. Otherwise this position equals to start position of skipped event. This is fixed by: - reading the event to be executed before checking if the until condition is satisfied. - comparing the start position of the event to be executed. Since we do not have the start position available, we compute it by subtracting event length from end position (which is available). - if there are no events on the event queue at the slave sql starting time, that meet until condition, we stop immediately, as in this case we do not want to wait for next event.
63 lines
1.7 KiB
Text
63 lines
1.7 KiB
Text
stop slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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reset master;
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reset slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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start slave;
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reset master;
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change master to master_host="127.0.0.1",master_port=SLAVE_PORT,master_user="root";
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start slave;
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create table t1 (n int);
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stop slave;
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create table t2 (n int);
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show tables;
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Tables_in_test
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t1
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t2
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create table t3 (n int) engine=innodb;
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set @a=1;
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insert into t3 values(@a);
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begin;
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insert into t3 values(2);
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insert into t3 values(3);
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commit;
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insert into t3 values(4);
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start slave until master_log_file="slave-bin.000001",master_log_pos=195;
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Warnings:
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Note 1278 It is recommended to use --skip-slave-start when doing step-by-step replication with START SLAVE UNTIL; otherwise, you will get problems if you get an unexpected slave's mysqld restart
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select master_pos_wait("slave-bin.000001",137);
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master_pos_wait("slave-bin.000001",137)
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0
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show tables;
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Tables_in_test
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t1
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t2
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start slave until master_log_file="slave-bin.000001",master_log_pos=438;
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Warnings:
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Note 1278 It is recommended to use --skip-slave-start when doing step-by-step replication with START SLAVE UNTIL; otherwise, you will get problems if you get an unexpected slave's mysqld restart
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select * from t3;
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n
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1
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start slave until master_log_file="slave-bin.000001",master_log_pos=663;
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Warnings:
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Note 1278 It is recommended to use --skip-slave-start when doing step-by-step replication with START SLAVE UNTIL; otherwise, you will get problems if you get an unexpected slave's mysqld restart
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select * from t3;
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n
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1
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2
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3
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start slave;
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create table t4 (n int);
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create table t5 (n int);
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create table t6 (n int);
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show tables;
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Tables_in_test
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t1
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t2
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t3
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t4
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t5
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t6
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stop slave;
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reset slave;
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drop table t1,t2,t3,t4,t5,t6;
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