1 files changed, 73 insertions, 0 deletions
diff --git a/mysql-test/t/trigger_notembedded.test b/mysql-test/t/trigger_notembedded.test
index 7a7e6c6bc85..1dee1db0a3a 100644
--- a/mysql-test/t/trigger_notembedded.test
+++ b/mysql-test/t/trigger_notembedded.test
@@ -875,6 +875,79 @@ DROP TABLE t1;
 DROP DATABASE mysqltest_db1;
 USE test;
 
+#
+# Bug #26162: Trigger DML ignores low_priority_updates setting
+#
+CREATE TABLE t1 (id INTEGER);
+CREATE TABLE t2 (id INTEGER);
+
+INSERT INTO t2 VALUES (1),(2);
+
+# trigger that produces the high priority insert, but should be low, adding
+# LOW_PRIORITY fixes this
+CREATE TRIGGER t1_test AFTER INSERT ON t1 FOR EACH ROW 
+  INSERT INTO t2 VALUES (new.id);
+
+CONNECT (rl_holder,    localhost, root,,);
+CONNECT (rl_acquirer,  localhost, root,,);
+CONNECT (wl_acquirer,  localhost, root,,);
+CONNECT (rl_contender, localhost, root,,);
+
+CONNECTION rl_holder;
+SELECT GET_LOCK('B26162',120);
+
+CONNECTION rl_acquirer;
+let $rl_acquirer_thread_id = `SELECT @@pseudo_thread_id`;
+--send
+SELECT 'rl_acquirer', GET_LOCK('B26162',120), id FROM t2 WHERE id = 1;
+
+CONNECTION wl_acquirer;
+let $wl_acquirer_thread_id = `SELECT @@pseudo_thread_id`;
+SET SESSION LOW_PRIORITY_UPDATES=1;
+SET GLOBAL LOW_PRIORITY_UPDATES=1;
+#need to wait for rl_acquirer to lock on the B26162 lock 
+let $wait_condition=
+  SELECT STATE = 'User lock' FROM INFORMATION_SCHEMA.PROCESSLIST
+   WHERE ID = $rl_acquirer_thread_id;
+--source include/wait_condition.inc
+--send
+INSERT INTO t1 VALUES (5);
+
+CONNECTION rl_contender;
+# Wait until wl_acquirer is waiting for the read lock on t2 to be released.
+let $wait_condition=
+  SELECT STATE = 'Locked' FROM INFORMATION_SCHEMA.PROCESSLIST
+   WHERE ID = $wl_acquirer_thread_id;
+--source include/wait_condition.inc
+# must not "see" the row inserted by the INSERT (as it must run before the
+# INSERT)
+--send
+SELECT 'rl_contender', id FROM t2 WHERE id > 1;
+
+CONNECTION rl_holder;
+#need to wait for wl_acquirer and rl_contender to lock on t2 
+sleep 2;
+SELECT RELEASE_LOCK('B26162');
+
+CONNECTION rl_acquirer;
+--reap
+SELECT RELEASE_LOCK('B26162');
+CONNECTION wl_acquirer;
+--reap
+CONNECTION rl_contender;
+--reap
+
+CONNECTION default;
+DISCONNECT rl_acquirer;
+DISCONNECT wl_acquirer;
+DISCONNECT rl_contender;
+DISCONNECT rl_holder;
+
+DROP TRIGGER t1_test;
+DROP TABLE t1,t2;
+SET SESSION LOW_PRIORITY_UPDATES=DEFAULT;
+SET GLOBAL LOW_PRIORITY_UPDATES=DEFAULT;
+
 --echo End of 5.0 tests.
 
 #