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2617.31.12, 2617.31.15, 2617.31.15, 2617.31.16, 2617.43.1 - initial changeset that introduced the fix for Bug#989 and follow up fixes for all test suite failures introduced in the initial changeset. ------------------------------------------------------------ revno: 2617.31.1 committer: Davi Arnaut <Davi.Arnaut@Sun.COM> branch nick: 4284-6.0 timestamp: Fri 2009-03-06 19:17:00 -0300 message: Bug#989: If DROP TABLE while there's an active transaction, wrong binlog order WL#4284: Transactional DDL locking Currently the MySQL server does not keep metadata locks on schema objects for the duration of a transaction, thus failing to guarantee the integrity of the schema objects being used during the transaction and to protect then from concurrent DDL operations. This also poses a problem for replication as a DDL operation might be replicated even thought there are active transactions using the object being modified. The solution is to defer the release of metadata locks until a active transaction is either committed or rolled back. This prevents other statements from modifying the table for the entire duration of the transaction. This provides commitment ordering for guaranteeing serializability across multiple transactions. - Incompatible change: If MySQL's metadata locking system encounters a lock conflict, the usual schema is to use the try and back-off technique to avoid deadlocks -- this schema consists in releasing all locks and trying to acquire them all in one go. But in a transactional context this algorithm can't be utilized as its not possible to release locks acquired during the course of the transaction without breaking the transaction commitments. To avoid deadlocks in this case, the ER_LOCK_DEADLOCK will be returned if a lock conflict is encountered during a transaction. Let's consider an example: A transaction has two statements that modify table t1, then table t2, and then commits. The first statement of the transaction will acquire a shared metadata lock on table t1, and it will be kept utill COMMIT to ensure serializability. At the moment when the second statement attempts to acquire a shared metadata lock on t2, a concurrent ALTER or DROP statement might have locked t2 exclusively. The prescription of the current locking protocol is that the acquirer of the shared lock backs off -- gives up all his current locks and retries. This implies that the entire multi-statement transaction has to be rolled back. - Incompatible change: FLUSH commands such as FLUSH PRIVILEGES and FLUSH TABLES WITH READ LOCK won't cause locked tables to be implicitly unlocked anymore.
56 lines
1.8 KiB
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56 lines
1.8 KiB
Text
#
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# Here we collect tests that doesn't work with the embedded server
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#
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-- source include/not_embedded.inc
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# The following fails sporadically because 'check-testcase' runs
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# queries before this test and there is no way to guarantee that any
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# previous process finishes. The purpose of the test is not clearly
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# stated, there is no reference to any bug report, and "select from
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# I_S from prepared statement" doesn't look like something that's
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# really imporant to test. I'm commenting out this for now. If
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# anyone wants to keep this, please fix the race and motivate why we
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# need to test this. If you see this comment and it is after mid-2009
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# or so, feel free to remove this test from the file. /Sven
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#
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#
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## Show full process list with prepare
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## To not show other connections, this must be the first test and we must
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## have a server restart before this one
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##
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## We don't have any 4.1 tests as we use I_S to query the PROCESSLIST to
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## exclude system threads that may/may not be active in the server
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## (namely the ndb injector thread)
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##
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## End of 4.1 tests
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#
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#prepare stmt1 from ' SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST WHERE COMMAND!=\'Daemon\' ';
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#--replace_column 1 number 6 time 3 localhost
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#execute stmt1;
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#deallocate prepare stmt1;
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call mtr.add_suppression("Can't open and lock privilege tables: Table 'host' was not locked with LOCK TABLES");
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#
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# Bug#43835: SHOW VARIABLES does not include 0 for slave_skip_errors
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#
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SHOW VARIABLES like 'slave_skip_errors';
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# End of 5.1 tests
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--echo #
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--echo # WL#4284: Transactional DDL locking
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--echo #
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--echo # FLUSH PRIVILEGES should not implicitly unlock locked tables.
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--echo #
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--disable_warnings
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drop table if exists t1;
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--enable_warnings
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create table t1 (c1 int);
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lock tables t1 read;
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--error ER_TABLE_NOT_LOCKED
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flush privileges;
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unlock tables;
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drop table t1;
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