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e333d82964
Comment from Codership:- To fix the problem, we changed the certification logic in galera to treat insert on child table row as exclusive to prevent any operation on referenced parent table row. At the same time, update and delete on child table row were demoted to "shared", which makes it possible to update/delete referenced parent table row, but only in a later transaction. This change allows somewhat more concurrency for foreign key constrained transactions, but is still safe for correct certification end result.
75 lines
2 KiB
PHP
75 lines
2 KiB
PHP
#
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# This file should be included from tests for MW-369 to run concurrent
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# transaction from node_1 with autocommit query from node_2.
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#
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# The parameters:
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# * $mw_369_parent_query - the parent query to be run inside transaction
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# * $mw_369_child_query - the child query
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#
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# The operations are the following:
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#
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# node_1:
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# START TRANSACTION;
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# $mw_369_parent_query
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# node_2
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# $mw_369_child_query - will be blocked on node_1 in apply monitor
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# node_1:
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# COMMIT; - will be blocked on node_1 in local monitor
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#
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# The $mw_369_child_query is always expected to succeed. The caller is
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# responsible for checking if the final COMMIT on connection node_1
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# succeeds.
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#
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--connection node_1
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SET AUTOCOMMIT=ON;
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START TRANSACTION;
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--eval $mw_369_parent_query
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#
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# Block the $mw_369_child_query from node_2
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#
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# --connect node_1a, 127.0.0.1, root, , test, $NODE_MYPORT_1
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--connection node_1a
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SET SESSION wsrep_sync_wait = 0;
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--let $galera_sync_point = apply_monitor_slave_enter_sync
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--source include/galera_set_sync_point.inc
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#
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# insert client row, which will make it impossible to replay the
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# delete on parent
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#
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--connection node_2
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--eval $mw_369_child_query
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#
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# Wait until $mw_369_child_query from node_2 reaches the sync point and
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# block the 'COMMIT' from node_1 before it certifies.
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#
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--connection node_1a
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--source include/galera_wait_sync_point.inc
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--source include/galera_clear_sync_point.inc
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--let $galera_sync_point = local_monitor_enter_sync
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--source include/galera_set_sync_point.inc
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--connection node_1
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--send COMMIT
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#
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# Wait until both sync points have been reached
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#
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--connection node_1a
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--let $galera_sync_point = apply_monitor_slave_enter_sync local_monitor_enter_sync
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--source include/galera_wait_sync_point.inc
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#
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# both threads are now parked in sync points, signal them to continue
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#
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--let $galera_sync_point = apply_monitor_slave_enter_sync
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--source include/galera_signal_sync_point.inc
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--let $galera_sync_point = local_monitor_enter_sync
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--source include/galera_signal_sync_point.inc
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--source include/galera_clear_sync_point.inc
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