rpl/t/rpl_parallel_conflicts.test

--source include/have_innodb.inc
--source include/have_debug.inc
--source include/have_debug_sync.inc
--source include/master-slave.inc

--echo *** MDEV-7847: "Slave worker thread retried transaction 10 time(s) in vain, giving up", followed by replication hanging ***
--echo *** MDEV-7882: Excessive transaction retry in parallel replication ***

--connection server_1
ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;
CREATE TABLE t7 (a int PRIMARY KEY, b INT) ENGINE=InnoDB;
CREATE TABLE t8 (a int PRIMARY KEY, b INT) ENGINE=InnoDB;
--save_master_pos

--connection server_2
--sync_with_master
--source include/stop_slave.inc


# Using dbug error injection, we artificially create event groups with a lot of
# conflicting transactions in each event group. The bugs were originally seen
# "in the wild" with transactions that did not conflict on the master, and only
# conflicted very rarely on the slave (maybe some edge case with InnoDB btree
# page splits or something like that). The event groups here loosely reflect
# the structure of the original failure's group commits.


--connection server_1
INSERT INTO t7 VALUES (1,1), (2,2), (3,3), (4,4), (5,5);
SET @old_dbug= @@SESSION.debug_dbug;
SET @commit_id= 42;
SET SESSION debug_dbug="+d,binlog_force_commit_id";
INSERT INTO t8 VALUES (1,1);
INSERT INTO t8 VALUES (2,2);
INSERT INTO t8 VALUES (3,3);
INSERT INTO t8 VALUES (4,4);
INSERT INTO t8 VALUES (5,5);
INSERT INTO t8 VALUES (6,6);
INSERT INTO t8 VALUES (7,7);
INSERT INTO t8 VALUES (8,8);

UPDATE t7 SET b=9 WHERE a=3;
UPDATE t7 SET b=10 WHERE a=3;
UPDATE t7 SET b=11 WHERE a=3;

INSERT INTO t8 VALUES (12,12);
INSERT INTO t8 VALUES (13,13);

UPDATE t7 SET b=14 WHERE a=3;
UPDATE t7 SET b=15 WHERE a=3;

INSERT INTO t8 VALUES (16,16);

UPDATE t7 SET b=17 WHERE a=3;

INSERT INTO t8 VALUES (18,18);
INSERT INTO t8 VALUES (19,19);

UPDATE t7 SET b=20 WHERE a=3;

INSERT INTO t8 VALUES (21,21);

UPDATE t7 SET b=22 WHERE a=3;

INSERT INTO t8 VALUES (23,24);
INSERT INTO t8 VALUES (24,24);

UPDATE t7 SET b=25 WHERE a=3;

INSERT INTO t8 VALUES (26,26);

UPDATE t7 SET b=27 WHERE a=3;

BEGIN;
INSERT INTO t8 VALUES (28,28);
INSERT INTO t8 VALUES (29,28), (30,28);
INSERT INTO t8 VALUES (31,28);
INSERT INTO t8 VALUES (32,28);
INSERT INTO t8 VALUES (33,28);
INSERT INTO t8 VALUES (34,28);
INSERT INTO t8 VALUES (35,28);
INSERT INTO t8 VALUES (36,28);
INSERT INTO t8 VALUES (37,28);
INSERT INTO t8 VALUES (38,28);
INSERT INTO t8 VALUES (39,28);
INSERT INTO t8 VALUES (40,28);
INSERT INTO t8 VALUES (41,28);
INSERT INTO t8 VALUES (42,28);
COMMIT;


SET @commit_id=43;
INSERT INTO t8 VALUES (43,43);
INSERT INTO t8 VALUES (44,44);

UPDATE t7 SET b=45 WHERE a=3;

INSERT INTO t8 VALUES (46,46);
INSERT INTO t8 VALUES (47,47);

UPDATE t7 SET b=48 WHERE a=3;

INSERT INTO t8 VALUES (49,49);
INSERT INTO t8 VALUES (50,50);


SET @commit_id=44;
INSERT INTO t8 VALUES (51,51);
INSERT INTO t8 VALUES (52,52);

UPDATE t7 SET b=53 WHERE a=3;

INSERT INTO t8 VALUES (54,54);
INSERT INTO t8 VALUES (55,55);

UPDATE t7 SET b=56 WHERE a=3;

INSERT INTO t8 VALUES (57,57);

UPDATE t7 SET b=58 WHERE a=3;

INSERT INTO t8 VALUES (58,58);
INSERT INTO t8 VALUES (59,59);
INSERT INTO t8 VALUES (60,60);
INSERT INTO t8 VALUES (61,61);

UPDATE t7 SET b=62 WHERE a=3;

INSERT INTO t8 VALUES (63,63);
INSERT INTO t8 VALUES (64,64);
INSERT INTO t8 VALUES (65,65);
INSERT INTO t8 VALUES (66,66);

UPDATE t7 SET b=67 WHERE a=3;

INSERT INTO t8 VALUES (68,68);

UPDATE t7 SET b=69 WHERE a=3;
UPDATE t7 SET b=70 WHERE a=3;
UPDATE t7 SET b=71 WHERE a=3;

INSERT INTO t8 VALUES (72,72);

UPDATE t7 SET b=73 WHERE a=3;
UPDATE t7 SET b=74 WHERE a=3;
UPDATE t7 SET b=75 WHERE a=3;
UPDATE t7 SET b=76 WHERE a=3;

INSERT INTO t8 VALUES (77,77);

UPDATE t7 SET b=78 WHERE a=3;

INSERT INTO t8 VALUES (79,79);

UPDATE t7 SET b=80 WHERE a=3;

INSERT INTO t8 VALUES (81,81);

UPDATE t7 SET b=82 WHERE a=3;

INSERT INTO t8 VALUES (83,83);

UPDATE t7 SET b=84 WHERE a=3;


SET @commit_id=45;
INSERT INTO t8 VALUES (85,85);
UPDATE t7 SET b=86 WHERE a=3;
INSERT INTO t8 VALUES (87,87);


SET @commit_id=46;
INSERT INTO t8 VALUES (88,88);
INSERT INTO t8 VALUES (89,89);
INSERT INTO t8 VALUES (90,90);

SET SESSION debug_dbug=@old_dbug;

INSERT INTO t8 VALUES (91,91);
INSERT INTO t8 VALUES (92,92);
INSERT INTO t8 VALUES (93,93);
INSERT INTO t8 VALUES (94,94);
INSERT INTO t8 VALUES (95,95);
INSERT INTO t8 VALUES (96,96);
INSERT INTO t8 VALUES (97,97);
INSERT INTO t8 VALUES (98,98);
INSERT INTO t8 VALUES (99,99);


SELECT * FROM t7 ORDER BY a;
SELECT * FROM t8 ORDER BY a;
--source include/save_master_gtid.inc


--connection server_2
--source include/start_slave.inc
--source include/sync_with_master_gtid.inc
SELECT * FROM t7 ORDER BY a;
SELECT * FROM t8 ORDER BY a;

--echo *** MDEV-8302: Duplicate key with parallel replication ***

--connection server_2
--source include/stop_slave.inc
/* Inject a small sleep which makes the race easier to hit. */
SET @old_dbug=@@GLOBAL.debug_dbug;
SET GLOBAL debug_dbug="+d,inject_mdev8302";


--connection server_1
INSERT INTO t7 VALUES (100,1), (101,2), (102,3), (103,4), (104,5);

# Artificially create a bunch of group commits with conflicting transactions.
# The bug happened when T1 and T2 was in one group commit, and T3 was in the
# following group commit. T2 is a DELETE of a row with same primary key as a
# row that T3 inserts. T1 and T2 can conflict, causing T2 to be deadlock
# killed after starting to commit. The bug was that T2 could roll back before
# doing unmark_start_commit(); this could allow T3 to run before the retry
# of T2, causing duplicate key violation.

SET @old_dbug= @@SESSION.debug_dbug;
SET @commit_id= 20000;
SET SESSION debug_dbug="+d,binlog_force_commit_id";

--let $n = 100
--disable_query_log
while ($n)
{
  eval UPDATE t7 SET b=b+1 WHERE a=100+($n MOD 5);
  eval DELETE FROM t7 WHERE a=100+($n MOD 5);

  SET @commit_id = @commit_id + 1;
  eval INSERT INTO t7 VALUES (100+($n MOD 5), $n);
  SET @commit_id = @commit_id + 1;
  dec $n;
}
--enable_query_log
SET SESSION debug_dbug=@old_dbug;


SELECT * FROM t7 ORDER BY a;
--source include/save_master_gtid.inc


--connection server_2
--source include/start_slave.inc
--source include/sync_with_master_gtid.inc
SELECT * FROM t7 ORDER BY a;

--source include/stop_slave.inc
SET GLOBAL debug_dbug=@old_dbug;

# Clean up.
--source include/start_slave.inc
SET DEBUG_SYNC= 'RESET';

--connection server_1
DROP TABLE t7,t8;
SET DEBUG_SYNC= 'RESET';

--source include/rpl_end.inc