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3c279d9a5a
The problem was that TRUNCATE TABLE didn't take a exclusive lock on a table if it resorted to truncating via delete of all rows in the table. Specifically for InnoDB tables, this could break proper isolation as InnoDB ends up aborting some granted locks when truncating a table. The solution is to take a exclusive metadata lock before TRUNCATE TABLE can proceed. This guarantees that no other transaction is using the table. Incompatible change: Truncate via delete no longer fails if sql_safe_updates is activated (this was a undocumented side effect).
45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
source include/have_log_bin.inc;
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source include/have_innodb.inc;
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let $engine = InnoDB;
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SET @old_binlog_format=@@binlog_format;
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SET BINLOG_FORMAT=ROW;
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RESET MASTER;
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source extra/binlog_tests/binlog_truncate.test;
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--echo # Even though the isolation level might be permissive, truncate
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--echo # table follows a stricter isolation as its locking is based on
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--echo # (exclusive) metadata locks.
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let $before_truncate = SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
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source extra/binlog_tests/binlog_truncate.test;
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let $before_truncate = SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
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source extra/binlog_tests/binlog_truncate.test;
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let $before_truncate = SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
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source extra/binlog_tests/binlog_truncate.test;
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let $before_truncate = SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
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source extra/binlog_tests/binlog_truncate.test;
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SET BINLOG_FORMAT=STATEMENT;
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RESET MASTER;
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source extra/binlog_tests/binlog_truncate.test;
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--echo # Truncate is not supported for SBR if the isolation level is
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--echo # READ UNCOMMITTED or READ COMMITTED. These specific isolation
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--echo # levels are tested elsewhere.
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let $before_truncate = SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
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source extra/binlog_tests/binlog_truncate.test;
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let $before_truncate = SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
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source extra/binlog_tests/binlog_truncate.test;
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SET BINLOG_FORMAT=@old_binlog_format;
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