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1af6e92f0b
The hang can happen between a lock connection issuing KILL CONNECTION for a victim, which is in committing phase. There happens two resource deadlockwhere killer is holding victim's LOCK_thd_data and requires trx mutex for the victim. The victim, otoh, holds his own trx mutex, but requires LOCK_thd_data in wsrep_commit_ordered(). Hence a classic two thread deadlock happens. The fix in this commit changes innodb commit so that wsrep_commit_ordered() is not called while holding trx mutex. With this, wsrep patch commit time mutex locking does not violate the locking protocol of KILL command (i.e. LOCK_thd_data -> trx mutex) Also, a new test case has been added in galera.galera_bf_kill.test for scenario where a client connection is killed in committting phase.
90 lines
2.0 KiB
Plaintext
90 lines
2.0 KiB
Plaintext
connection node_2;
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connection node_1;
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connection node_2;
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CREATE TABLE t1(a int not null primary key auto_increment,b int) engine=InnoDB;
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insert into t1 values (NULL,1);
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connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
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connection node_2a;
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begin;
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update t1 set a = 5;
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connection node_2;
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select * from t1;
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a b
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2 1
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disconnect node_2a;
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connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
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connection node_2a;
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begin;
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update t1 set a =5;
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connection node_2;
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select * from t1;
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a b
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2 1
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disconnect node_2a;
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connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
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connection node_2a;
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begin;
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update t1 set a =5, b=2;
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connection node_2;
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ALTER TABLE t1 ADD UNIQUE KEY b1(b);
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ALTER TABLE t1 DROP KEY b1;
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select * from t1;
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a b
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2 1
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disconnect node_2a;
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connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
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connection node_2a;
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begin;
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update t1 set a =5, b=2;
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connect node_2b, 127.0.0.1, root, , test, $NODE_MYPORT_2;
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connection node_2b;
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begin;
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update t1 set a =6, b=7;
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connection node_2;
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ALTER TABLE t1 ADD UNIQUE KEY b2(b);
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ALTER TABLE t1 DROP KEY b2;
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select * from t1;
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a b
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2 1
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disconnect node_2a;
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disconnect node_2b;
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connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
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connection node_2a;
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SET SESSION wsrep_on=OFF;
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begin;
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update t1 set a =5, b=2;
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connection node_2;
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ALTER TABLE t1 ADD UNIQUE KEY b3(b);
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select * from t1;
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a b
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2 1
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disconnect node_2a;
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connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
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connection node_2a;
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SET SESSION wsrep_on=OFF;
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begin;
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update t1 set a =5, b=2;
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connection node_2;
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select * from t1;
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a b
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2 1
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disconnect node_2a;
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drop table t1;
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connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
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connection node_2a;
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CREATE TABLE t1 (i int primary key);
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SET DEBUG_SYNC = "before_wsrep_ordered_commit SIGNAL bwoc_reached WAIT_FOR bwoc_continue";
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INSERT INTO t1 VALUES (1);
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connection node_2;
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SET DEBUG_SYNC = "now WAIT_FOR bwoc_reached";
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SET DEBUG_SYNC = "now SIGNAL bwoc_continue";
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SET DEBUG_SYNC='RESET';
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connection node_2a;
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connection node_2;
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select * from t1;
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i
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1
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disconnect node_2a;
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connection node_2;
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drop table t1;
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