1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
--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
SET @old_mode= @@GLOBAL.slave_parallel_mode;
SET GLOBAL slave_parallel_mode='conservative';
SET @old_threads= @@GLOBAL.slave_parallel_threads;
SET GLOBAL slave_parallel_threads=40;
SET @old_transaction_retries= @@GLOBAL.slave_transaction_retries;
SET GLOBAL slave_transaction_retries=5;
# 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;
SET GLOBAL slave_parallel_mode=@old_mode;
SET GLOBAL slave_parallel_threads=@old_threads;
SET GLOBAL slave_transaction_retries=@old_transaction_retries;
# 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
|
