1、trove mysql replica 一些限制
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trove 可以同时支持binlog replica 和gtid replica
gtid 需要mysql5.6及其以上版本
newton trove 对mysql 的 binlog replica 支持不是很好
newton trove 对mysql的gtid replica 可以正常工作
newton trove 可以创建 mysql5.5 binlog replica
detach-replica：Mysql 5.5 binlog 模式可以正常工作
eject-replica-source：对binlog复制模式mysql5.5报错，binlog模式报错信息：Could not locate column in row for column 'Master_UUID'
promote-to-replica-source：Mysql5.5 binlog 模式报错，操作中会用到gtid
2、与replica 相关的命令
trove create # 创建复制
trove detach-replica # 从复制中移除slave
trove promote-to-replica-source #master，slave都存活的情况下，将指定的slave提升为master，原master降为slave
trove eject-replica-source # 当master失去心跳，可以移除master，trove在slave选择一个合适的节点作为master
3、创建复制
trove create ab 6 --size 5 --databases myDB \
--users userA:password --datastore_version mysql-5.6 \
--datastore mysql
trove create ab-slave1 6 --size 5 --replica_of ab --replica_count 2 \
--datastore_version mysql-5.6 --datastore mysql
4、分离slave
trove show ab-slave2-2
+-------------------+--------------------------------------+
| Property | Value |
+-------------------+--------------------------------------+
| created | 2017-03-31T03:29:20 |
| datastore | mysql |
| datastore_version | mysql-5.6 |
| flavor | 6 |
| id | caa908f1-5e14-4c65-ac0e-a9ba26536107 |
| ip | 172.168.10.6 |
| name | ab-slave2-2 |
| replica_of | 3d39a475-3277-4d24-9467-ebc254e9316f |
| status | ACTIVE |
| updated | 2017-03-31T06:19:30 |
| volume | 5 |
| volume_used | 0.14 |
+-------------------+--------------------------------------+
trove detach-replica ab-slave2-2
trove show ab-slave2-2
+-------------------+--------------------------------------+
| Property | Value |
+-------------------+--------------------------------------+
| created | 2017-03-31T03:29:20 |
| datastore | mysql |
| datastore_version | mysql-5.6 |
| flavor | 6 |
| id | caa908f1-5e14-4c65-ac0e-a9ba26536107 |
| ip | 172.168.10.6 |
| name | ab-slave2-2 |
| status | ACTIVE |
| updated | 2017-03-31T06:28:45 |
| volume | 5 |
| volume_used | 0.14 |
+-------------------+--------------------------------------+
5、提升slave为master
trove show ab-slave3-1
+-------------------+--------------------------------------+
| Property | Value |
+-------------------+--------------------------------------+
| created | 2017-03-31T03:36:16 |
| datastore | mysql |
| datastore_version | mysql-5.6 |
| flavor | 6 |
| id | f303fc8f-819b-47b5-b33a-38184c8aff90 |
| ip | 172.168.10.14 |
| name | ab-slave3-1 |
| replica_of | 3d39a475-3277-4d24-9467-ebc254e9316f |
| status | ACTIVE |
| updated | 2017-03-31T06:19:30 |
| volume | 5 |
| volume_used | 0.14 |
+-------------------+--------------------------------------+
trove promote-to-replica-source ab-slave3-1
# ab-slave3-1已提升为master
trove show ab-slave3-1
+-------------------+----------------------------------------------------------------------------+
| Property | Value |
+-------------------+----------------------------------------------------------------------------+
| created | 2017-03-31T03:36:16 |
| datastore | mysql |
| datastore_version | mysql-5.6 |
| flavor | 6 |
| id | f303fc8f-819b-47b5-b33a-38184c8aff90 |
| ip | 172.168.10.14 |
| name | ab-slave3-1 |
| replicas | 3d39a475-3277-4d24-9467-ebc254e9316f, f4b3be64-c204-439d-a9c4-e28cb543a3b9 |
| status | ACTIVE |
| updated | 2017-03-31T06:33:39 |
| volume | 5 |
| volume_used | 0.14 |
+-------------------+----------------------------------------------------------------------------+
# master已降级为slave
trove show 3d39a475-3277-4d24-9467-ebc254e9316f
+-------------------+--------------------------------------+
| Property | Value |
+-------------------+--------------------------------------+
| created | 2017-03-31T06:14:35 |
| datastore | mysql |
| datastore_version | mysql-5.6 |
| flavor | 6 |
| id | 3d39a475-3277-4d24-9467-ebc254e9316f |
| ip | 172.168.10.8 |
| name | ab |
| replica_of | f303fc8f-819b-47b5-b33a-38184c8aff90 |
| status | ACTIVE |
| updated | 2017-03-31T06:33:39 |
| volume | 5 |
| volume_used | 0.14 |
+-------------------+--------------------------------------+
6、移除master
移除master需要在master已经失去心跳的情况下做，如果master尚有心跳是无法移除master的
可以通过停止master上的trove-guestagent模拟master失去心跳
service trove-guestagent stop
trove eject-replica-source
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