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MDEV-225: Replace with dummy events an event that is not understood by a slave to which it should be sent

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Add function to replace arbitrary event with dummy event.

Add code which uses this to fix the bug that enabling row_annotate events
on the master breaks slaves which do not request such events.

Add that slaves set a variable @mariadb_slave_capability to inform the
master in a robust way about which events it can, and cannot, handle.

Add tests.
This commit is contained in:
unknown
2012-06-22 11:40:40 +02:00
parent c562c74478
commit 9fe317ffd6
8 changed files with 459 additions and 6 deletions
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98
mysql-test/suite/rpl/r/rpl_mariadb_slave_capability.result Normal file
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include/master-slave.inc
[connection master]
set @old_master_binlog_checksum= @@global.binlog_checksum;
set @old_slave_dbug= @@global.debug_dbug;
CREATE TABLE t1 (a INT PRIMARY KEY);
INSERT INTO t1 VALUES (0);
# Test slave with no capability gets dummy event, which is ignored.
include/stop_slave.inc
SET @@global.debug_dbug='+d,simulate_slave_capability_none';
include/start_slave.inc
ALTER TABLE t1 ORDER BY a;
SET SESSION binlog_annotate_row_events = ON;
DELETE FROM t1;
INSERT INTO t1 /* A comment just to make the annotate event sufficiently long that the dummy event will need to get padded with spaces so that we can test that this works */ VALUES(1);
show binlog events in 'master-bin.000001' from <binlog_start> limit 0, 10;
Log_name Pos Event_type Server_id End_log_pos Info
master-bin.000001 # Query # # BEGIN
master-bin.000001 # Annotate_rows # # DELETE FROM t1
master-bin.000001 # Table_map # # table_id: # (test.t1)
master-bin.000001 # Delete_rows # # table_id: # flags: STMT_END_F
master-bin.000001 # Query # # COMMIT
master-bin.000001 # Query # # BEGIN
master-bin.000001 # Annotate_rows # # INSERT INTO t1 /* A comment just to make the annotate event sufficiently long that the dummy event will need to get padded with spaces so that we can test that this works */ VALUES(1)
master-bin.000001 # Table_map # # table_id: # (test.t1)
master-bin.000001 # Write_rows # # table_id: # flags: STMT_END_F
master-bin.000001 # Query # # COMMIT
SELECT * FROM t1;
a
1
show relaylog events in 'slave-relay-bin.000003' from <binlog_start> limit 0,10;
Log_name Pos Event_type Server_id End_log_pos Info
slave-relay-bin.000003 # Query # # BEGIN
slave-relay-bin.000003 # User var # # @`!dummyvar`=NULL
slave-relay-bin.000003 # Table_map # # table_id: # (test.t1)
slave-relay-bin.000003 # Delete_rows # # table_id: # flags: STMT_END_F
slave-relay-bin.000003 # Query # # COMMIT
slave-relay-bin.000003 # Query # # BEGIN
slave-relay-bin.000003 # Query # # # Dummy event replacing event type 160 that slave cannot handle.
slave-relay-bin.000003 # Table_map # # table_id: # (test.t1)
slave-relay-bin.000003 # Write_rows # # table_id: # flags: STMT_END_F
slave-relay-bin.000003 # Query # # COMMIT
set @@global.debug_dbug= @old_slave_dbug;
# Test dummy event is checksummed correctly.
set @@global.binlog_checksum = CRC32;
TRUNCATE t1;
INSERT INTO t1 VALUES(2);
show binlog events in 'master-bin.000002' from <binlog_start> limit 0, 5;
Log_name Pos Event_type Server_id End_log_pos Info
master-bin.000002 # Query # # BEGIN
master-bin.000002 # Annotate_rows # # INSERT INTO t1 VALUES(2)
master-bin.000002 # Table_map # # table_id: # (test.t1)
master-bin.000002 # Write_rows # # table_id: # flags: STMT_END_F
master-bin.000002 # Query # # COMMIT
SELECT * FROM t1;
a
2
show relaylog events in 'slave-relay-bin.000005' from <binlog_start> limit 3,5;
Log_name Pos Event_type Server_id End_log_pos Info
slave-relay-bin.000005 # Query # # BEGIN
slave-relay-bin.000005 # Query # # # Dummy ev
slave-relay-bin.000005 # Table_map # # table_id: # (test.t1)
slave-relay-bin.000005 # Write_rows # # table_id: # flags: STMT_END_F
slave-relay-bin.000005 # Query # # COMMIT
# Test that slave which cannot tolerate holes in binlog stream but
# knows the event does not get dummy event
include/stop_slave.inc
SET @@global.debug_dbug='+d,simulate_slave_capability_old_53';
include/start_slave.inc
ALTER TABLE t1 ORDER BY a;
UPDATE t1 SET a = 3;
show binlog events in 'master-bin.000002' from <binlog_start> limit 0, 5;
Log_name Pos Event_type Server_id End_log_pos Info
master-bin.000002 # Query # # BEGIN
master-bin.000002 # Annotate_rows # # UPDATE t1 SET a = 3
master-bin.000002 # Table_map # # table_id: # (test.t1)
master-bin.000002 # Update_rows # # table_id: # flags: STMT_END_F
master-bin.000002 # Query # # COMMIT
SELECT * FROM t1;
a
3
show relaylog events in 'slave-relay-bin.000006' from <binlog_start> limit 0,5;
Log_name Pos Event_type Server_id End_log_pos Info
slave-relay-bin.000006 # Query # # BEGIN
slave-relay-bin.000006 # Annotate_rows # # UPDATE t1 SET a = 3
slave-relay-bin.000006 # Table_map # # table_id: # (test.t1)
slave-relay-bin.000006 # Update_rows # # table_id: # flags: STMT_END_F
slave-relay-bin.000006 # Query # # COMMIT
select @@global.log_slave_updates;
@@global.log_slave_updates
1
select @@global.replicate_annotate_row_events;
@@global.replicate_annotate_row_events
0
set @@global.debug_dbug= @old_slave_dbug;
Clean up.
set @@global.binlog_checksum = @old_master_binlog_checksum;
DROP TABLE t1;
include/rpl_end.inc