Bug #93884 why not remove instance from innodb cluster?

• Submitted: 11 Jan 2019 2:19
• Modified: 22 Jan 2019 12:05
• Reporter: yingzhe shi
• Status: Can't repeat
• Category: Shell AdminAPI InnoDB Cluster / ReplicaSet
• Severity: S3 (Non-critical)
• Version: Ver 8.0.13
• OS: CentOS (CentOS Linux release 7.6.1810 (Core))
• Assigned to: MySQL Verification Team
• CPU Architecture: x86

[11 Jan 2019 2:19] yingzhe shi

Description:
I have an existing deployment of Group Replication with three node4, and I use the adoptFromGR option to the dba.createCluster() function. After creating innodb cluster, I add a new node to the innodb cluster. I use <cluster>.removeInstance() to remove the node, but failed. 
error_msg: SystemError: LogicError: Cluster.remove_instance: get_string(7): field is NULL

How to repeat:
1. Create MGR cluster
2. use adoptFromGR option to the dba.createCluster() function.
3. add a new node to the innodb cluster
4. removeInstance

[22 Jan 2019 12:05] MySQL Verification Team

Hi,

> <cluster>.removeInstance() to remove the node, but failed. 
> error_msg: SystemError: LogicError: Cluster.remove_instance: get_string(7): field is NULL

I cannot reproduce this. What parameter did you give to removeInstance? 

Please share more data.

all best
Bogdan