MySQL从5.6升级到5.7.13后，开启多源复制，遇到重复的channel name
1.一共三个数据库，原版本均为5.6，升级到5.7.13后开启多源复制，做成两主一从，发现channel name同名。
2. 在从库执行reset slave all后，从库自动重启。
3. 5.6 ---> 5.7.13:
4. 5.6：
5. 1 cd /usr/local/mysql ; scripts/mysql_install_db --user=mysql --defaults-file=/57data/my56.cnf
6. 2 /usr/local/mysql/bin/mysqld_safe --defaults-file=/57data/my56.cnf &
7. 3 mysqladmin -S /tmp/mysql3307.sock -u root -P3307 -p password
8. 4 mysql -uroot -S /tmp/mysql3307.sock -pmysql
9. 5 set global innodb_fast_shutdown=0;
10. 6 mysqladmin -S /tmp/mysql3307.sock shutdown
11.
12. 5.7：
13. 7 cd /usr/local/mysql57 ; ./bin/mysqld_safe --defaults-file=/57data/my.cnf &
14. 8 cd /usr/local/mysql57 ; ./bin/mysql_upgrade -S /tmp/mysql3307.sock
15. 9 cd /usr/local/mysql57 ; ./bin/mysqladmin -S /tmp/mysql3307.sock shutdown
16. 10 cd /usr/local/mysql57 ; ./bin/mysqld_safe --defaults-file=/57data/my.cnf &
17. 11 /usr/local/mysql57/bin/mysql -S /tmp/mysql3307.sock
18. 12 grant replication slave,replication client on *.* to repl@'%' identified by 'passw0rd';
19. 13
20. mysql> SET GLOBAL master_info_repository = 'TABLE';
21. Query OK, 0 rows affected (0.00 sec)
22.
23. mysql> SET GLOBAL relay_log_info_repository = 'TABLE';
24. Query OK, 0 rows affected (0.00 sec)
25.
26. mysql>
27. mysql> change master to master_host='vm2',
28. -> master_user='repl',
29. -> MASTER_PORT=3307,
30. -> master_password='passw0rd',
31. -> master_auto_position=1 FOR CHANNEL 'master_vm2';
32.
33. change master to master_host='vm3',
34. master_user='repl',
35. MASTER_PORT=3307,
36. master_password='passw0rd',
37. Query OK, 0 rows affected, 2 warnings (0.08 sec)
38.
39. mysql>
40. mysql> change master to master_host='vm3',
41. -> master_user='repl',
42. -> MASTER_PORT=3307,
43. -> master_password='passw0rd',
44. -> master_auto_position=1 FOR CHANNEL 'master_vm3';
45. Query OK, 0 rows affected, 2 warnings (0.04 sec)
46.
47. mysql>
48. mysql>
49. mysql> show slave status\G;
50. *************************** 1. row ***************************
51. Slave_IO_State:
52. Master_Host: vm2
53. Master_User: repl
54. Master_Port: 3307
55. Connect_Retry: 60
56. Master_Log_File:
57. Read_Master_Log_Pos: 4
58. Relay_Log_File: vm4-relay-bin-master_vm2.000001
59. Relay_Log_Pos: 4
60. Relay_Master_Log_File:
61. Slave_IO_Running: No
62. Slave_SQL_Running: No
63. Replicate_Do_DB:
64. Replicate_Ignore_DB:
65. Replicate_Do_Table:
66. Replicate_Ignore_Table:
67. Replicate_Wild_Do_Table:
68. Replicate_Wild_Ignore_Table:
69. Last_Errno: 0
70. Last_Error:
71. Skip_Counter: 0
72. Exec_Master_Log_Pos: 0
73. Relay_Log_Space: 154
74. Until_Condition: None
75. Until_Log_File:
76. Until_Log_Pos: 0
77. Master_SSL_Allowed: No
78. Master_SSL_CA_File:
79. Master_SSL_CA_Path:
80. Master_SSL_Cert:
81. Master_SSL_Cipher:
82. Master_SSL_Key:
83. Seconds_Behind_Master: NULL
84. Master_SSL_Verify_Server_Cert: No
85. Last_IO_Errno: 0
86. Last_IO_Error:
87. Last_SQL_Errno: 0
88. Last_SQL_Error:
89. Replicate_Ignore_Server_Ids:
90. Master_Server_Id: 0
91. Master_UUID:
92. Master_Info_File: mysql.slave_master_info
93. SQL_Delay: 0
94. SQL_Remaining_Delay: NULL
95. Slave_SQL_Running_State:
96. Master_Retry_Count: 86400
97. Master_Bind:
98. Last_IO_Error_Timestamp:
99. Last_SQL_Error_Timestamp:
100. Master_SSL_Crl:
101. Master_SSL_Crlpath:
102. Retrieved_Gtid_Set:
103. Executed_Gtid_Set: 45ee9543-2d51-11e6-ba5d-0800276e6667:1-2,
104. 4acf2a8c-2d51-11e6-ba5d-080027806975:1-2,
105. 4c01fc54-2d51-11e6-ba5d-08002781f86e:1-6
106. Auto_Position: 1
107. Replicate_Rewrite_DB:
108. Channel_Name: master_vm2
109. Master_TLS_Version:
110. *************************** 2. row ***************************
111. Slave_IO_State:
112. Master_Host: vm3
113. Master_User: repl
114. Master_Port: 3307
115. Connect_Retry: 60
116. Master_Log_File:
117. Read_Master_Log_Pos: 4
118. Relay_Log_File: vm4-relay-bin-master_vm3.000001
119. Relay_Log_Pos: 4
120. Relay_Master_Log_File:
121. Slave_IO_Running: No
122. Slave_SQL_Running: No
123. Replicate_Do_DB:
124. Replicate_Ignore_DB:
125. Replicate_Do_Table:
126. Replicate_Ignore_Table:
127. Replicate_Wild_Do_Table:
128. Replicate_Wild_Ignore_Table:
129. Last_Errno: 0
130. Last_Error:
131. Skip_Counter: 0
132. Exec_Master_Log_Pos: 0
133. Relay_Log_Space: 154
134. Until_Condition: None
135. Until_Log_File:
136. Until_Log_Pos: 0
137. Master_SSL_Allowed: No
138. Master_SSL_CA_File:
139. Master_SSL_CA_Path:
140. Master_SSL_Cert:
141. Master_SSL_Cipher:
142. Master_SSL_Key:
143. Seconds_Behind_Master: NULL
144. Master_SSL_Verify_Server_Cert: No
145. Last_IO_Errno: 0
146. Last_IO_Error:
147. Last_SQL_Errno: 0
148. Last_SQL_Error:
149. Replicate_Ignore_Server_Ids:
150. Master_Server_Id: 0
151. Master_UUID:
152. Master_Info_File: mysql.slave_master_info
153. SQL_Delay: 0
154. SQL_Remaining_Delay: NULL
155. Slave_SQL_Running_State:
156. Master_Retry_Count: 86400
157. Master_Bind:
158. Last_IO_Error_Timestamp:
159. Last_SQL_Error_Timestamp:
160. Master_SSL_Crl:
161. Master_SSL_Crlpath:
162. Retrieved_Gtid_Set:
163. Executed_Gtid_Set: 45ee9543-2d51-11e6-ba5d-0800276e6667:1-2,
164. 4acf2a8c-2d51-11e6-ba5d-080027806975:1-2,
165. 4c01fc54-2d51-11e6-ba5d-08002781f86e:1-6
166. Auto_Position: 1
167. Replicate_Rewrite_DB:
168. Channel_Name: master_vm2
169. Master_TLS_Version:
170. 2 rows in set (0.00 sec)
171.
172. ERROR:
173. No query specified
174.
175. mysql>
176.
177. mysql> select CHANNEL_NAME FROM performance_schema.replication_connection_status;
178. +--------------+
179. | CHANNEL_NAME |
180. +--------------+
181. | master_vm2 |
182. | master_vm2 |
183. +--------------+
184. 2 rows in set (0.01 sec)
185.
186.
187. mysql> select CHANNEL_NAME FROM performance_schema.replication_connection_status;
188. +--------------+
189. | CHANNEL_NAME |
190. +--------------+
191. | master_vm2 |
192. | master_vm2 |
193. +--------------+
194. 2 rows in set (0.01 sec)
195.
196. mysql> start slave;
197. Query OK, 0 rows affected (0.04 sec)
198.
199. 在两主库分别建数据库vm2和vm3,系统正常复制到从库。
200. mysql> show databases;
201. +--------------------+
202. | Database |
203. +--------------------+
204. | information_schema |
205. | mysql |
206. | performance_schema |
207. | sys |
208. | test |
209. | vm2 |
210. | vm3 |
211. +--------------------+
212. 7 rows in set (0.00 sec)
213.
214. 在从库执行reset slave all，从库自动重启。
215. mysql> reset slave all;
216. ERROR 2013 (HY000): Lost connection to MySQL server during query
217. mysql> 2016-06-08T08:56:18.890685Z mysqld_safe Number of processes running now: 0
218. 2016-06-08T08:56:18.906614Z mysqld_safe mysqld restarted
219.
220. mysql>
221. mysql> reset slave all;
222. ERROR 2006 (HY000): MySQL server has gone away
223. No connection. Trying to reconnect...
224. Connection id: 2
225. Current database: *** NONE ***
226.
227. Query OK, 0 rows affected (0.09 sec)
228.
229. mysql> show slave status\G;
230. Empty set (0.01 sec)
231.
232. ERROR:
233. No query specified
234.
235.
236. err log里channel name信息显示正确，但出现Thread pointer相关信息，如下：
237. 2016-06-08T08:55:54.540373Z 4 [Note] Error reading relay log event for channel 'master_vm2': slave SQL thread was killed
238. 2016-06-08T08:55:54.550729Z 3 [Note] Slave I/O thread killed while reading event for channel 'master_vm2'
239. 2016-06-08T08:55:54.550814Z 3 [Note] Slave I/O thread exiting for channel 'master_vm2', read up to log 'mysql_bin.000005', position 653
240. 2016-06-08T08:55:54.556301Z 6 [Note] Error reading relay log event for channel 'master_vm3': slave SQL thread was killed
241. 2016-06-08T08:55:54.563404Z 5 [Note] Slave I/O thread killed while reading event for channel 'master_vm3'
242. 2016-06-08T08:55:54.563549Z 5 [Note] Slave I/O thread exiting for channel 'master_vm3', read up to log 'mysql_bin.000005', position 653
243. 08:56:18 UTC - mysqld got signal 11 ;
244. This could be because you hit a bug. It is also possible that this binary
245. or one of the libraries it was linked against is corrupt, improperly built,
246. or misconfigured. This error can also be caused by malfunctioning hardware.
247. Attempting to collect some information that could help diagnose the problem.
248. As this is a crash and something is definitely wrong, the information
249. collection process might fail.
250.
251. key_buffer_size=8388608
252. read_buffer_size=131072
253. max_used_connections=1
254. max_threads=151
255. thread_count=1
256. connection_count=1
257. It is possible that mysqld could use up to
258. key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 68189 K bytes of memory
259. Hope that's ok; if not, decrease some variables in the equation.