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Bug #38360: BLACKHOLE replication with RBR is broken

The Blackhole engine did not support row-based replication
since the delete_row(), update_row(), and the index and range
searching functions were not implemented.

This patch adds row-based replication support for the
Blackhole engine by implementing the two functions mentioned
above, and making the engine pretend that it has found the
correct row to delete or update when executed from the slave
SQL thread by implementing index and range searching functions.

It is necessary to only pretend this for the SQL thread, since
a SELECT executed on the Blackhole engine will otherwise never
return EOF, causing a livelock.


mysql-test/extra/binlog_tests/blackhole.test:
  Blackhole now handles row-based replication.
mysql-test/extra/rpl_tests/rpl_blackhole.test:
  Test helper file for testing that blackhole actually
  writes something to the binary log on the slave.
mysql-test/suite/binlog/t/binlog_multi_engine.test:
  Replication now handles row-based replcation.
mysql-test/suite/rpl/t/rpl_blackhole.test:
  Test that Blackhole works with primary key, index, or none.
sql/log_event.cc:
  Correcting code to only touch filler bits and leave
  all other bits alone. It is necessary since there is
  no guarantee that the engine will be able to fill in
  the bits correctly (e.g., the blackhole engine).
storage/blackhole/ha_blackhole.cc:
  Adding definitions for update_row() and delete_row() to return OK
  when executed from the slave SQL thread with thd->query == NULL
  (indicating that row-based replication events are being processed).
  
  Changing rnd_next(), index_read(), index_read_idx(), and
  index_read_last() to return OK when executed from the slave SQL
  thread (faking that the row has been found so that processing
  proceeds to update/delete the row).
storage/blackhole/ha_blackhole.h:
  Enabling row capabilities for engine.
  Defining write_row(), update_row(), and delete_row().
  Making write_row() private (as it should be).
This commit is contained in:
Mats Kindahl
2008-10-02 11:02:38 +02:00
parent 70e2f814a7
commit 8d9cf89e96
10 changed files with 231 additions and 28 deletions

View File

@ -43,8 +43,6 @@ INSERT INTO t1n VALUES (1,1), (1,2), (2,1), (2,2);
UPDATE t1m, t1b SET m = 2, b = 3 WHERE n = c;
UPDATE t1m, t1n SET m = 2, e = 3 WHERE n = f;
ERROR HY000: Binary logging not possible. Message: Statement cannot be written atomically since more than one engine involved and at least one engine is self-logging
UPDATE t1n, t1b SET e = 2, b = 3 WHERE f = c;
ERROR HY000: Binary logging not possible. Message: Statement cannot be written atomically since more than one engine involved and at least one engine is self-logging
TRUNCATE t1m;
TRUNCATE t1b;
TRUNCATE t1n;
@ -68,20 +66,21 @@ RESET MASTER;
SET SESSION BINLOG_FORMAT=ROW;
INSERT INTO t1m VALUES (1,1), (1,2), (2,1), (2,2);
INSERT INTO t1b VALUES (1,1), (1,2), (2,1), (2,2);
ERROR HY000: Binary logging not possible. Message: Row-based format required for this statement, but not allowed by this combination of engines
INSERT INTO t1n VALUES (1,1), (1,2), (2,1), (2,2);
UPDATE t1m, t1b SET m = 2, b = 3 WHERE n = c;
ERROR HY000: Binary logging not possible. Message: Row-based format required for this statement, but not allowed by this combination of engines
UPDATE t1m, t1n SET m = 2, e = 3 WHERE n = f;
ERROR HY000: Binary logging not possible. Message: Statement cannot be written atomically since more than one engine involved and at least one engine is self-logging
UPDATE t1n, t1b SET e = 2, b = 3 WHERE f = c;
ERROR HY000: Binary logging not possible. Message: Row-based format required for this statement, but not allowed by this combination of engines
ERROR HY000: Binary logging not possible. Message: Statement cannot be written atomically since more than one engine involved and at least one engine is self-logging
show binlog events from <binlog_start>;
Log_name Pos Event_type Server_id End_log_pos Info
master-bin.000001 # Query # # use `test`; BEGIN
master-bin.000001 # Table_map # # table_id: # (test.t1m)
master-bin.000001 # Write_rows # # table_id: # flags: STMT_END_F
master-bin.000001 # Query # # use `test`; COMMIT
master-bin.000001 # Query # # use `test`; BEGIN
master-bin.000001 # Table_map # # table_id: # (test.t1b)
master-bin.000001 # Write_rows # # table_id: # flags: STMT_END_F
master-bin.000001 # Query # # use `test`; COMMIT
master-bin.000001 # Query # # BEGIN
master-bin.000001 # Table_map # # table_id: # (test.t1n)
master-bin.000001 # Table_map # # table_id: # (mysql.ndb_apply_status)