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Re: Discrepancy between mysqlsh and performance_schema with 8.0.11
Posted by: Grant Gavares
Date: May 15, 2018 04:46PM

More details. If I create a cluster with 3 configured seed nodes but only two of the seed nodes available and then run:

dba.createCluster('test')

The cluster is created with the two healthy machines as a part of the cluster:

{
"nodes": {
"mysql-1.local:3306": {
"status": "ONLINE",
"role": "HA",
"mode": "R/W"
},
"mysql-3.local:3306": {
"status": "ONLINE",
"role": "HA",
"mode": "R/O"
}
},
"primary": {
"host": "mysql-1.local",
"port": "3306"
}
}



The missing node (mysql-2) is started with the same set of seed nodes and, according to the logs, believes it has joined the replication group:


2018-05-15T22:36:27.935787Z 0 [Note] [MY-011503] [Repl] Plugin group_replication reported: 'Group membership changed to mysql-2.local:3306, mysql-3.local:3306, mysql-1.local:3306 on view 15264235362398542:3.'
2018-05-15T22:36:27.935958Z 0 [Note] [MY-011490] [Repl] Plugin group_replication reported: 'This server was declared online within the replication group.'


The host doesn't show up in the output of 'dba.getCluster().status()' which still looks exactly as pasted above.

The performance_schema.replication_group_members table does show mysql-2 is online and is registered as a SECONDARY:

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 60b49200-5890-11e8-9b8f-0242ac120003 | mysql-2.local | 3306 | ONLINE | SECONDARY | 8.0.11 |
| group_replication_applier | caa25534-588f-11e8-b478-0242ac120004 | mysql-3.local | 3306 | ONLINE | SECONDARY | 8.0.11 |
| group_replication_applier | cacd3971-588f-11e8-b480-0242ac120002 | mysql-1.local | 3306 | ONLINE | PRIMARY | 8.0.11 |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
3 rows in set (0.00 sec)

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Re: Discrepancy between mysqlsh and performance_schema with 8.0.11
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May 15, 2018 04:46PM


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