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4e1e9ea6f3
From the very beginning, the default InnoDB transaction isolation level
REPEATABLE READ does not correspond to any well formed definition.
The main issue is the lack of write/write conflict detection.
To fix that and to make REPEATABLE READ correspond to Snapshot Isolation,
b8a6719889 introduced the Boolean
session variable innodb_snapshot_isolation. It was disabled by default
in order not to break any user applications.
In a new major version of MariaDB Server, we had better enable this
parameter by default.
107 lines
3.1 KiB
Plaintext
107 lines
3.1 KiB
Plaintext
--source include/galera_cluster.inc
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--source include/have_innodb.inc
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#
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# Test the effect of Cluster Configuration Change on a concurrently-running SR transaction
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# We use SET GLOBAL wsrep_cluster_address = '' to cause the slave (node_2) to temporarily
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# leave the cluster.
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#
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# Save original auto_increment_offset values.
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--let $node_1=node_1
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--let $node_2=node_2
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--source ../../galera/include/auto_increment_offset_save.inc
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# Start with a clean slate
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--connection node_2
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SELECT COUNT(*) = 0 FROM mysql.wsrep_streaming_log;
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--connection node_1
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SELECT COUNT(*) = 0 FROM mysql.wsrep_streaming_log;
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CREATE TABLE t1 (f1 INTEGER) ENGINE=InnoDB;
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--let $wsrep_trx_fragment_size_orig = `SELECT @@wsrep_trx_fragment_size`
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SET SESSION wsrep_trx_fragment_size = 1;
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SET AUTOCOMMIT=OFF;
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START TRANSACTION;
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INSERT INTO t1 VALUES (1);
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INSERT INTO t1 VALUES (2);
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INSERT INTO t1 VALUES (3);
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INSERT INTO t1 VALUES (4);
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INSERT INTO t1 VALUES (5);
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SELECT COUNT(*) > 0 FROM mysql.wsrep_streaming_log;
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--connection node_2
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SELECT COUNT(*) > 0 FROM mysql.wsrep_streaming_log;
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#
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# Trigger CC . The transaction should be able to continue
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#
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--connection node_2
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--let $wsrep_cluster_address_orig = `SELECT @@wsrep_cluster_address`
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SET GLOBAL wsrep_cluster_address = '';
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# Wait until the node_2 disconnects from the cluster
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SET SESSION wsrep_sync_wait = 0;
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--let $wait_condition = SELECT VARIABLE_VALUE = 'Disconnected' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status'
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--source include/wait_condition.inc
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SET SESSION wsrep_sync_wait = default;
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--connection node_1
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# Wait until the node_1 sees the cluster configuration change
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--let $wait_condition = SELECT VARIABLE_VALUE = 1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size'
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--source include/wait_condition.inc
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# Continue generating events in the transaction
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SET innodb_snapshot_isolation=OFF;
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INSERT INTO t1 VALUES (6);
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INSERT INTO t1 VALUES (7);
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INSERT INTO t1 VALUES (8);
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INSERT INTO t1 VALUES (9);
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INSERT INTO t1 VALUES (10);
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SELECT COUNT(*) > 0 FROM mysql.wsrep_streaming_log;
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# Restore cluster
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--connection node_2
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--disable_query_log
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--eval SET GLOBAL wsrep_cluster_address='$wsrep_cluster_address_orig';
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--enable_query_log
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--source include/galera_wait_ready.inc
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# Confirm that the SR table still contains entries from ongoing transaction
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SELECT COUNT(*) > 0 FROM mysql.wsrep_streaming_log;
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# Continue and finalize transaction
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--connection node_1
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INSERT INTO t1 VALUES (11);
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INSERT INTO t1 VALUES (12);
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INSERT INTO t1 VALUES (13);
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INSERT INTO t1 VALUES (14);
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INSERT INTO t1 VALUES (16);
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COMMIT;
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SELECT COUNT(*) = 0 FROM mysql.wsrep_streaming_log;
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# Confirm that transaction was replicated properly
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# and SR table is cleaned up afterwards.
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--connection node_2
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--let $wait_condition = SELECT COUNT(*) = 15 FROM t1;
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--source include/wait_condition.inc
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SELECT COUNT(*) = 0 FROM mysql.wsrep_streaming_log;
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DROP TABLE t1;
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CALL mtr.add_suppression("points to own listening address, blacklisting");
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# Restore original auto_increment_offset values.
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--source ../../galera/include/auto_increment_offset_restore.inc
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