41 lines
1.3 KiB
Plaintext
41 lines
1.3 KiB
Plaintext
DROP TABLE IF EXISTS t1;
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SET DEBUG_SYNC= 'RESET';
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CREATE TABLE t1 (kill_id INT);
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INSERT INTO t1 VALUES(connection_id());
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# Switching to connection 'default'.
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# Start transaction.
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BEGIN;
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INSERT INTO t1 VALUES(connection_id());
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# Ensure that COMMIT will pause once it acquires protection
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# against its global read lock.
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SET DEBUG_SYNC='ha_commit_trans_after_acquire_commit_lock SIGNAL acquired WAIT_FOR go';
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# Sending:
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COMMIT;
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# Switching to 'con1'.
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# Wait till COMMIT acquires protection against global read
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# lock and pauses.
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SET DEBUG_SYNC='now WAIT_FOR acquired';
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# Sending:
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FLUSH TABLES WITH READ LOCK;
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# Switching to 'con2'.
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SELECT ((@id := kill_id) - kill_id) FROM t1 LIMIT 1;
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((@id := kill_id) - kill_id)
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0
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Warnings:
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Warning 1287 Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
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# Wait till FLUSH TABLES WITH READ LOCK blocks due
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# to active COMMIT
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# Kill connection 'con1'.
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KILL CONNECTION @id;
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# Switching to 'con1'.
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# Try to reap FLUSH TABLES WITH READ LOCK,
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# it fail due to killed statement and connection.
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Got one of the listed errors
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# Switching to 'con2'.
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# Resume COMMIT.
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SET DEBUG_SYNC='now SIGNAL go';
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# Switching to 'default'.
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# Reaping COMMIT.
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DROP TABLE t1;
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SET DEBUG_SYNC= 'RESET';
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