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Report claims that Seconds_behind_master behaves unexpectedly. Code analysis shows that there is an evident flaw in that treating of FormatDescription event is wrong so that after FLUSH LOGS on slave the Seconds_behind_master's calculation slips and incorrect value can be reported to SHOW SLAVE STATUS. Even worse is that the gap between the correct and incorrect deltas grows with time. Fixed with prohibiting changes to rpl->last_master_timestamp by artifical events (any kind of). suggestion as comments is added how to fight with lack of info on the slave side by means of new heartbeat feature coming. The test can not be done ealily fully determistic.
71 lines
1.5 KiB
Text
71 lines
1.5 KiB
Text
#
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# Testing replication delay reporting (bug#29309)
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# there is an unavoidable non-determinism in the test
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# please compare the results with the comments
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#
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source include/master-slave.inc;
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connection master;
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#connection slave;
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sync_slave_with_master;
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--replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
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--replace_column 1 # 8 # 9 # 23 #
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--query_vertical show slave status /* Second_behind reports 0 */;
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sleep 3;
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### bug emulation
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connection master;
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drop table if exists t1;
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create table t1 (f1 int);
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sleep 3;
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#connection slave;
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sync_slave_with_master;
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flush logs /* contaminate rli->last_master_timestamp */;
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connection slave;
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lock table t1 write;
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connection master;
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insert into t1 values (1);
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sleep 3;
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connection slave;
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--replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
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--replace_column 1 # 8 # 9 # 23 #
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--query_vertical show slave status /* bug emulated: reports slave threads starting time about 3*3 not 3 secs */;
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unlock tables;
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connection master;
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sync_slave_with_master;
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### bugfix
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connection slave;
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flush logs /* this time rli->last_master_timestamp is not affected */;
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lock table t1 write;
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connection master;
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insert into t1 values (2);
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sleep 3;
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connection slave;
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--replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
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--replace_column 1 # 8 # 9 # 23 #
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--query_vertical show slave status /* reports the correct diff with master query time about 3+3 secs */;
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unlock tables;
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connection master;
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drop table t1;
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#connection slave;
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sync_slave_with_master;
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# End of tests
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