Details
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Bug
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Status: Closed (View Workflow)
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Minor
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Resolution: Fixed
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None
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None
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None
Description
After the fix for MDEV-4688, at any point of time I see two consequent values in mysql.gtid_slave_pos for a given domain:
# [slave] Table contents after 1st synchronization
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domain_id sub_id server_id seq_no
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0 1 1 1
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0 2 1 2
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As long as the slave is running, the values get rotated:
# [slave] Table contents after 2nd synchronization
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domain_id sub_id server_id seq_no
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0 2 1 2
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0 3 1 3
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It's new, but doesn't seem too bad in itself, so if it helps to fix some other issues, so be it.
However, after server restart, the old values are kept in the table, and new ones are added when replication resumes:
# [slave] Table contents after 1st restart
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domain_id sub_id server_id seq_no
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0 2 1 2
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0 3 1 3
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# [slave] Table contents after 3rd synchronization
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domain_id sub_id server_id seq_no
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0 2 1 2
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0 3 1 3
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0 4 1 4
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# [slave] Table contents after 2nd restart
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domain_id sub_id server_id seq_no
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0 2 1 2
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0 3 1 3
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0 4 1 4
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# [slave] Table contents after 4th synchronization
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domain_id sub_id server_id seq_no
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0 2 1 2
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0 3 1 3
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0 5 1 5
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0 6 1 6
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etc.
It's possibly harmless if the slave makes sure it always uses the greatest value for a domain (as it probably does anyway), but with time the table might get cluttered, so if it's fixable, I think it's better to fix it
bzr version-info
revision-id: knielsen@knielsen-hq.org-20130621095346-9bi73emjowwe396n
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revno: 3663
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branch-nick: 10.0-base
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Test case:
--source include/master-slave.inc
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--source include/have_innodb.inc
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--source include/have_binlog_format_row.inc
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--connection slave
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set sql_log_bin=0; |
--source include/stop_slave.inc
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alter table mysql.gtid_slave_pos engine=InnoDB; |
change master to master_use_gtid=current_pos; |
--source include/start_slave.inc
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--connection master
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create table t1 (i int, c varchar(8)) engine=InnoDB; |
insert into t1 values (1,'a'),(2,'b'); |
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--sync_slave_with_master
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--echo # [slave] Table contents after 1st synchronization
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select * from mysql.gtid_slave_pos; |
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--connection master
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insert into t1 values (3,'c'),(4,'d'); |
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--sync_slave_with_master
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--echo # [slave] Table contents after 2nd synchronization
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select * from mysql.gtid_slave_pos; |
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--enable_reconnect
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--append_file $MYSQLTEST_VARDIR/tmp/mysqld.2.expect
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restart
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EOF
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--shutdown_server 0
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--source include/wait_until_connected_again.inc
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--echo # [slave] Table contents after 1st restart
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select * from mysql.gtid_slave_pos; |
--source include/start_slave.inc
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--connection master
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insert into t1 values (5,'e'),(6,'f'); |
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--sync_slave_with_master
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--echo # [slave] Table contents after 3nd synchronization
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select * from mysql.gtid_slave_pos; |
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--enable_reconnect
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--append_file $MYSQLTEST_VARDIR/tmp/mysqld.2.expect
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restart
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EOF
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--shutdown_server 0
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--source include/wait_until_connected_again.inc
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--echo # [slave] Table contents after 2nd restart
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select * from mysql.gtid_slave_pos; |
--source include/start_slave.inc
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--connection master
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insert into t1 values (7,'g'),(8,'h'); |
drop table t1; |
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--sync_slave_with_master
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--echo # [slave] Table contents after 4th synchronization
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select * from mysql.gtid_slave_pos; |
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Attachments
Issue Links
- relates to
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MDEV-26 Global transaction ID
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- Closed
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