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Code Activity

MDEV-20574 Position of events reported by mysqlbinlog is wrong with encrypted binlogs, SHOW BINLOG EVENTS reports the correct one.

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Analysis

Mysqlbinlog output for encrypted binary log
#Q> insert into tab1 values (3,'row 003')
#190912 17:36:35 server id 10221  end_log_pos 980 CRC32 0x53bcb3d3  Table_map: `test`.`tab1` mapped to number 19
# at 940
#190912 17:36:35 server id 10221  end_log_pos 1026 CRC32 0xf2ae5136     Write_rows: table id 19 flags: STMT_END_F

Here we can see Table_map_log_event ends at 980 but Next event starts at 940.
And the reason for that is we do not send START_ENCRYPTION_EVENT to the slave

Solution:-
Send Start_encryption_log_event as Ignorable_log_event to slave(mysqlbinlog),
So that mysqlbinlog can update its log_pos.
Since Slave can request multiple FORMAT_DESCRIPTION_EVENT while master does not
have so We only update slave master pos when master actually have the
FORMAT_DESCRIPTION_EVENT. Similar logic should be applied for START_ENCRYPTION_EVENT.

Also added the test case when new server reads the data from old server which
does not send START_ENCRYPTION_EVENT to slave.

Master Slave Upgrade Scenario.
When Slave is updated first, Slave will have extra logic of handling
START_ENCRYPTION_EVENT But master willnot be sending START_ENCRYPTION_EVENT.
So there will be no issue.
When Master is updated first, It will send  START_ENCRYPTION_EVENT to
slave , But slave will ignore this event in queue_event.
This commit is contained in:
Sachin Setiya
2019-09-26 15:05:55 +05:30
parent 13535b2713
commit 27664ef29d
9 changed files with 159 additions and 35 deletions
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27
mysql-test/suite/binlog_encryption/binlog_mdev_20574_old_binlog.result Normal file
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include/master-slave.inc
[connection master]
connection slave;
include/stop_slave.inc
connection master;
include/rpl_stop_server.inc [server_number=1]
# Data in binlog
# CREATE TABLE t1 (a INT);
# INSERT INTO t1 VALUES (1),(2),(3);
# REPLACE INTO t1 VALUES (4);
include/rpl_start_server.inc [server_number=1]
connection slave;
RESET SLAVE;
RESET MASTER;
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;
include/start_slave.inc
DESC t1;
Field Type Null Key Default Extra
a int(11) YES NULL
SELECT * FROM t1 ORDER BY a;
a
1
2
3
4
DROP TABLE t1;
include/rpl_end.inc