深度理解MySQL Group Replication的RECOVERING狀態-mysql教程-PHP中文網

首頁

資料庫

mysql教程

深度理解MySQL Group Replication的RECOVERING狀態

黄舟

Mar 22, 2017 pm 01:25 PM

接收到警報通知，db3這台群組複製成員故障down機了，等修復好，啟動伺服器，然後再啟動mysql實例，進去查看狀態，變成了RECOVERING，如下所示；

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| CHANNEL_NAME  | MEMBER_ID  | MEMBER_HOST          | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| group_replication_applier | 3381d155-d7d1-11e6-94f7-b8ca3af6e36c | hch_test_dbm2_121_71 |   3317 | ONLINE       |
| group_replication_applier | 664b9ce9-d7de-11e6-9e8c-18a99b763071 | hch_test_web_1_24  |        3317 | ONLINE     |
| group_replication_applier | 84dba8ff-d7d2-11e6-aa9a-18a99b76310d | bpe_service      |     3317 | RECOVERING   |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
3 rows in set (0.00 sec)


mysql>

這種狀態有點類似mongodb的sendary的RECOVERING狀態，對於剛出現的MySQL Group Replication新技術，遇到這種情況，這種情況怎麼辦？

在mongodb的這種模式下，一般是secondary從primary庫上不停複製數據，所以我們遵循這種思路，去看下db2的數據目錄，看到有很多relay-bin的recovery日誌在應用執行，如下所示relay日誌包記錄

-rw-r----- 1 mysql mysql  383 1月  17 16:08 bpe_service-relay-bin-group_replication_applier.000019
-rw-r----- 1 mysql mysql  502 1月  17 16:11 bpe_service-relay-bin-group_replication_applier.000020
-rw-r----- 1 mysql mysql  502 1月  17 16:23 bpe_service-relay-bin-group_replication_applier.000021
-rw-r----- 1 mysql mysql  421 1月  17 16:23 bpe_service-relay-bin-group_replication_applier.000022
-rw-r----- 1 mysql mysql  228 1月  17 16:23 bpe_service-relay-bin-group_replication_applier.index
-rw-r----- 1 mysql mysql  312 1月  17 16:24 bpe_service-relay-bin-group_replication_recovery.000007
-rw-r----- 1 mysql mysql 1.1G 1月  17 16:24 bpe_service-relay-bin-group_replication_recovery.000008
-rw-r----- 1 mysql mysql  391 1月  17 16:24 bpe_service-relay-bin-group_replication_recovery.000009
-rw-r----- 1 mysql mysql  312 1月  17 16:24 bpe_service-relay-bin-group_replication_recovery.000010
-rw-r----- 1 mysql mysql 1.1G 1月  17 16:24 bpe_service-relay-bin-group_replication_recovery.000011
-rw-r----- 1 mysql mysql  391 1月  17 16:24 bpe_service-relay-bin-group_replication_recovery.000012
-rw-r----- 1 mysql mysql  312 1月  17 16:24 bpe_service-relay-bin-group_replication_recovery.000013
-rw-r----- 1 mysql mysql 1.1G 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000014
-rw-r----- 1 mysql mysql  391 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000015
-rw-r----- 1 mysql mysql  312 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000016
-rw-r----- 1 mysql mysql 1.1G 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000017
-rw-r----- 1 mysql mysql  391 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000018
-rw-r----- 1 mysql mysql  312 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000019
-rw-r----- 1 mysql mysql 1.1G 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000020
-rw-r----- 1 mysql mysql  391 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000021
-rw-r----- 1 mysql mysql  312 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000022
-rw-r----- 1 mysql mysql 1.1G 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000023
-rw-r----- 1 mysql mysql  391 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000024
-rw-r----- 1 mysql mysql  312 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.000025
-rw-r----- 1 mysql mysql 181M 1月  17 16:26 bpe_service-relay-bin-group_replication_recovery.000026
-rw-r----- 1 mysql mysql 1.2K 1月  17 16:25 bpe_service-relay-bin-group_replication_recovery.index
drwxr-x--- 2 mysql mysql 4.0K 1月  17 14:11 business_db

然後在mysql窗口，可以看到幾個線程，其中有一個就是Reading event from the relay log線程，就是表示正在應用relay日誌：

mysql> show full processlist;
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+-----------------------+
| Id | User        | Host      | db   | Command | Time | State    | Info                 |
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+-----------------------+
| 28 | system user |           | NULL | Connect |  701 | Suspending    | NULL                  |
| 31 | system user |           | NULL | Connect |  701 | Slave has read all relay log; waiting for more updates | NULL  |
| 35 | system user |           | NULL | Connect |  699 | Waiting for master to send event  | NULL    |
| 36 | system user |           | NULL | Connect | 4519 | Reading event from the relay log   | NULL  |
| 38 | root        | localhost | NULL | Query   |    0 | starting   | show full processlist |
+----+-------------+-----------+------+---------+------+--------------------------------------------------------+-----------------------+
5 rows in set (0.00 sec)


mysql>

再過一會兒，資料同步完成之後，bpe_service就會從RECOVERING變成ONLINE狀態。這個更加證實了，數據已經同步完成。

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID   | MEMBER_HOST          | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
| group_replication_applier | 3381d155-d7d1-11e6-94f7-b8ca3af6e36c | hch_test_dbm2_121_71 |        3317 | ONLINE       |
| group_replication_applier | 664b9ce9-d7de-11e6-9e8c-18a99b763071 | hch_test_web_1_24    |        3317 | ONLINE       |
| group_replication_applier | 84dba8ff-d7d2-11e6-aa9a-18a99b76310d | bpe_service          |        3317 | ONLINE       |
+---------------------------+--------------------------------------+----------------------+-------------+--------------+
3 rows in set (0.00 sec)


mysql>

去查看後台error log日誌顯示，剛開始啟動，在做CHANGE MASTER TO FOR CHANNEL 'group_replication_applier' executed'的時候，沒有取到值，然後看後面同步完後，就會執行加入群組複製成員的命令

“CHANGE MASTER TO FOR CHANNEL &#39;group_replication_recovery&#39; executed&#39;.
 Previous state master_host=&#39;hch_test_web_1_24&#39;, master_port= 3317, master_log_file=&#39;&#39;, 
 master_log_pos= 4, master_bind=&#39;&#39;. New state master_host=&#39;<NULL>&#39;, master_port= 0, master_log_file=&#39;&#39;, master_log_pos= 4, master_bind=&#39;&#39;”，

在執行結束後，最後告訴我們「'This server was declared online within the replication group'」已經加入了群組成員，而且變成了即時的ONLINE狀態：

2017-01-17T08:23:15.710146Z 4 [Note] Plugin group_replication reported: &#39;auto_increment_increment is reset to 1&#39;
2017-01-17T08:23:15.710200Z 4 [Note] Plugin group_replication reported: &#39;auto_increment_offset is reset to 1&#39;
2017-01-17T08:23:15.710401Z 20 [Note] Error reading relay log event for channel &#39;group_replication_applier&#39;: slave SQL thread was killed
2017-01-17T08:23:15.711212Z 17 [Note] Plugin group_replication reported: &#39;The group replication applier thread was killed&#39;
2017-01-17T08:23:42.141239Z 4 [Note] Plugin group_replication reported: &#39;Group communication SSL configuration: group_replication_ssl_mode: "DISABLED"&#39;
2017-01-17T08:23:42.141451Z 4 [Note] Plugin group_replication reported: &#39;[GCS] Added automatically IP ranges 127.0.0.1/8,192.168.121.111/23 to the whitelist&#39;
2017-01-17T08:23:42.141990Z 4 [Note] Plugin group_replication reported: &#39;[GCS] Translated &#39;db2&#39; to 192.168.121.111&#39;
2017-01-17T08:23:42.142174Z 4 [Note] Plugin group_replication reported: &#39;[GCS] SSL was not enabled&#39;
2017-01-17T08:23:42.142220Z 4 [Note] Plugin group_replication reported: &#39;Initialized group communication with configuration: 
group_replication_group_name: "e4668cea-d7ca-11e6-86b5-18a99b76310d"; group_replication_local_address: "db2:24902"; 
group_replication_group_seeds: "db1:24901,db2:24902,db3:24903"; group_replication_bootstrap_group: false; 
group_replication_poll_spin_loops: 0; group_replication_compression_threshold: 1000000; group_replication_ip_whitelist: "AUTOMATIC"&#39;
2017-01-17T08:23:42.142936Z 28 [Note] &#39;CHANGE MASTER TO FOR CHANNEL &#39;group_replication_applier&#39; executed&#39;. 
Previous state master_host=&#39;<NULL>&#39;, master_port= 0, master_log_file=&#39;&#39;, master_log_pos= 4, master_bind=&#39;&#39;. 
New state master_host=&#39;<NULL>&#39;, master_port= 0, master_log_file=&#39;&#39;, master_log_pos= 4, master_bind=&#39;&#39;.

-- #（1）尝试启动默认的组复制，结果信息不对称，启动失败，然后开始初始化Group Replication
2017-01-17T08:23:42.166956Z 31 [Note] Slave SQL thread for channel &#39;group_replication_applier&#39; initialized, 
starting replication in log &#39;FIRST&#39; at position 0, relay log &#39;./bpe_service-relay-bin-group_replication_applier.000019&#39; position: 4
2017-01-17T08:23:42.166960Z 4 [Note] Plugin group_replication reported: &#39;Group Replication applier module successfully initialized!&#39;
2017-01-17T08:23:42.167064Z 4 [Note] Plugin group_replication reported: &#39;auto_increment_increment is set to 7&#39;
2017-01-17T08:23:42.167079Z 4 [Note] Plugin group_replication reported: &#39;auto_increment_offset is set to 12002&#39;
2017-01-17T08:23:42.167219Z 0 [Note] Plugin group_replication reported: &#39;state 4257 action xa_init&#39;
2017-01-17T08:23:42.167292Z 0 [Note] Plugin group_replication reported: &#39;Successfully bound to 0.0.0.0:24902 (socket=49).&#39;
2017-01-17T08:23:42.167341Z 0 [Note] Plugin group_replication reported: &#39;Successfully set listen backlog to 32 (socket=49)!&#39;
2017-01-17T08:23:42.167357Z 0 [Note] Plugin group_replication reported: &#39;Successfully unblocked socket (socket=49)!&#39;
2017-01-17T08:23:42.167400Z 0 [Note] Plugin group_replication reported: &#39;connecting to db2 24902&#39;
2017-01-17T08:23:42.167585Z 0 [Note] Plugin group_replication reported: &#39;Ready to accept incoming connections on 0.0.0.0:24902 (socket=49)!&#39;
2017-01-17T08:23:42.174427Z 0 [Note] Plugin group_replication reported: &#39;client connected to db2 24902 fd 50&#39;
2017-01-17T08:23:42.174807Z 0 [Note] Plugin group_replication reported: &#39;connecting to db2 24902&#39;
2017-01-17T08:23:42.175008Z 0 [Note] Plugin group_replication reported: &#39;client connected to db2 24902 fd 63&#39;
2017-01-17T08:23:42.175234Z 0 [Note] Plugin group_replication reported: &#39;connecting to db2 24902&#39;
2017-01-17T08:23:42.175411Z 0 [Note] Plugin group_replication reported: &#39;client connected to db2 24902 fd 65&#39;
2017-01-17T08:23:42.175614Z 0 [Note] Plugin group_replication reported: &#39;connecting to db2 24902&#39;
2017-01-17T08:23:42.175799Z 0 [Note] Plugin group_replication reported: &#39;client connected to db2 24902 fd 67&#39;
2017-01-17T08:23:42.176006Z 0 [Note] Plugin group_replication reported: &#39;connecting to db2 24902&#39;
2017-01-17T08:23:42.176176Z 0 [Note] Plugin group_replication reported: &#39;client connected to db2 24902 fd 69&#39;
2017-01-17T08:23:42.176377Z 0 [Note] Plugin group_replication reported: &#39;connecting to db2 24902&#39;
2017-01-17T08:23:42.176563Z 0 [Note] Plugin group_replication reported: &#39;client connected to db2 24902 fd 71&#39;
2017-01-17T08:23:42.176876Z 0 [Note] Plugin group_replication reported: &#39;connecting to db1 24901&#39;
2017-01-17T08:23:42.177312Z 0 [Note] Plugin group_replication reported: &#39;client connected to db1 24901 fd 73&#39;
2017-01-17T08:23:43.463474Z 0 [Note] Plugin group_replication reported: &#39;state 4257 action xa_snapshot&#39;
2017-01-17T08:23:43.463969Z 0 [Note] Plugin group_replication reported: &#39;new state x_recover&#39;
2017-01-17T08:23:43.464000Z 0 [Note] Plugin group_replication reported: &#39;state 4277 action xa_complete&#39;
2017-01-17T08:23:43.464275Z 0 [Note] Plugin group_replication reported: &#39;new state x_run&#39;
2017-01-17T08:23:44.619112Z 0 [Note] Plugin group_replication reported: &#39;Starting group replication recovery with view_id 14844510167669342:17&#39; 

--#（2） 开始进行组内数据recovery
2017-01-17T08:23:44.619451Z 34 [Note] Plugin group_replication reported: &#39;Establishing group recovery connection with a possible donor. Attempt 1/10&#39;
2017-01-17T08:23:44.624181Z 34 [Note] &#39;CHANGE MASTER TO FOR CHANNEL &#39;group_replication_recovery&#39; executed&#39;. Previous state master_host=&#39;<NULL>&#39;, 
master_port= 0, master_log_file=&#39;&#39;, master_log_pos= 4, master_bind=&#39;&#39;. New state master_host=&#39;hch_test_web_1_24&#39;, master_port= 3317, 
master_log_file=&#39;&#39;, master_log_pos= 4, master_bind=&#39;&#39;.
2017-01-17T08:23:44.628853Z 34 [Note] Plugin group_replication reported: &#39;Establishing connection to a group replication
 recovery donor 664b9ce9-d7de-11e6-9e8c-18a99b763071 at hch_test_web_1_24 port: 3317.&#39;
2017-01-17T08:23:44.629156Z 35 [Warning] Storing MySQL user name or password information in the master info repository is not secure and
 is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the &#39;START SLAVE Syntax&#39;
  in the MySQL Manual for more information.
2017-01-17T08:23:44.635870Z 36 [Note] Slave SQL thread for channel &#39;group_replication_recovery&#39; initialized, starting
 replication in log &#39;FIRST&#39; at position 0, relay log &#39;./bpe_service-relay-bin-group_replication_recovery.000001&#39; position: 4
2017-01-17T08:23:44.681897Z 35 [Note] Slave I/O thread for channel &#39;group_replication_recovery&#39;: 
connected to master &#39;repl@hch_test_web_1_24:3317&#39;,replication started in log &#39;FIRST&#39; at position 4
2017-01-17T08:43:34.219952Z 34 [Note] Plugin group_replication reported: &#39;Terminating existing group replication donor connection and 
purging the corresponding logs.&#39;
2017-01-17T08:43:34.220609Z 36 [Note] Slave SQL thread for channel &#39;group_replication_recovery&#39; exiting, 
replication stopped in log &#39;binlog.000042&#39; at position 185511578
2017-01-17T08:43:34.226869Z 35 [Note] Slave I/O thread killed while reading event for channel &#39;group_replication_recovery&#39;
2017-01-17T08:43:34.226886Z 35 [Note] Slave I/O thread exiting for channel &#39;group_replication_recovery&#39;, read up to log &#39;binlog.000042&#39;, position 185511578
2017-01-17T08:43:34.269973Z 34 [Note] &#39;CHANGE MASTER TO FOR CHANNEL &#39;group_replication_recovery&#39; executed&#39;. 
Previous state master_host=&#39;hch_test_web_1_24&#39;, master_port= 3317, master_log_file=&#39;&#39;,
 master_log_pos= 4, master_bind=&#39;&#39;. New state master_host=&#39;<NULL>&#39;, master_port= 0, master_log_file=&#39;&#39;, master_log_pos= 4, master_bind=&#39;&#39;.

-- # （3）已经数据恢复完成，加入组，成为组成员
2017-01-17T08:43:34.290920Z 0 [Note] Plugin group_replication reported: &#39;This server was declared online within the replication group&#39;

小結：mysql group replication的使用來說，有些理念比如mongodb的分片以及primary-secondary的思路理念可以參考下，這樣理解起來就會比較容易一些。

以上是深度理解MySQL Group Replication的RECOVERING狀態的詳細內容。更多資訊請關注PHP中文網其他相關文章！

陳述

本文內容由網友自願投稿，版權歸原作者所有。本站不承擔相應的法律責任。如發現涉嫌抄襲或侵權的內容，請聯絡admin@php.cn

MySQL與Sqlite有何不同？Apr 24, 2025 am 12:12 AM

MySQL和SQLite的主要區別在於設計理念和使用場景：1.MySQL適用於大型應用和企業級解決方案，支持高性能和高並發；2.SQLite適合移動應用和桌面軟件，輕量級且易於嵌入。

MySQL中的索引是什麼？它們如何提高性能？Apr 24, 2025 am 12:09 AM

MySQL中的索引是數據庫表中一列或多列的有序結構，用於加速數據檢索。 1）索引通過減少掃描數據量提升查詢速度。 2）B-Tree索引利用平衡樹結構，適合範圍查詢和排序。 3）創建索引使用CREATEINDEX語句，如CREATEINDEXidx_customer_idONorders(customer_id)。 4）複合索引可優化多列查詢，如CREATEINDEXidx_customer_orderONorders(customer_id,order_date)。 5）使用EXPLAIN分析查詢計劃，避

說明如何使用MySQL中的交易來確保數據一致性。Apr 24, 2025 am 12:09 AM

在MySQL中使用事務可以確保數據一致性。 1)通過STARTTRANSACTION開始事務，執行SQL操作後用COMMIT提交或ROLLBACK回滾。 2)使用SAVEPOINT可以設置保存點，允許部分回滾。 3)性能優化建議包括縮短事務時間、避免大規模查詢和合理使用隔離級別。

在哪些情況下，您可以選擇PostgreSQL而不是MySQL？Apr 24, 2025 am 12:07 AM

選擇PostgreSQL而非MySQL的場景包括：1)需要復雜查詢和高級SQL功能，2)要求嚴格的數據完整性和ACID遵從性，3)需要高級空間功能，4)處理大數據集時需要高性能。 PostgreSQL在這些方面表現出色，適合需要復雜數據處理和高數據完整性的項目。

如何保護MySQL數據庫？Apr 24, 2025 am 12:04 AM

MySQL數據庫的安全可以通過以下措施實現：1.用戶權限管理：通過CREATEUSER和GRANT命令嚴格控制訪問權限。 2.加密傳輸：配置SSL/TLS確保數據傳輸安全。 3.數據庫備份和恢復：使用mysqldump或mysqlpump定期備份數據。 4.高級安全策略：使用防火牆限制訪問，並啟用審計日誌記錄操作。 5.性能優化與最佳實踐：通過索引和查詢優化以及定期維護兼顧安全和性能。

您可以使用哪些工具來監視MySQL性能？Apr 23, 2025 am 12:21 AM

如何有效監控MySQL性能？使用mysqladmin、SHOWGLOBALSTATUS、PerconaMonitoringandManagement(PMM)和MySQLEnterpriseMonitor等工具。 1.使用mysqladmin查看連接數。 2.用SHOWGLOBALSTATUS查看查詢數。 3.PMM提供詳細性能數據和圖形化界面。 4.MySQLEnterpriseMonitor提供豐富的監控功能和報警機制。

MySQL與SQL Server有何不同？Apr 23, 2025 am 12:20 AM

MySQL和SQLServer的区别在于：1)MySQL是开源的，适用于Web和嵌入式系统，2)SQLServer是微软的商业产品，适用于企业级应用。两者在存储引擎、性能优化和应用场景上有显著差异，选择时需考虑项目规模和未来扩展性。

在哪些情況下，您可以選擇SQL Server而不是MySQL？Apr 23, 2025 am 12:20 AM

在需要高可用性、高級安全性和良好集成性的企業級應用場景下，應選擇SQLServer而不是MySQL。 1)SQLServer提供企業級功能，如高可用性和高級安全性。 2)它與微軟生態系統如VisualStudio和PowerBI緊密集成。 3)SQLServer在性能優化方面表現出色，支持內存優化表和列存儲索引。

See all articles