Bug #98524 ERROR 3096 (HY000): The START GROUP_REPLICATION command failed as there was an e
Submitted: 9 Feb 2:47 Modified: 28 Feb 12:38
Reporter: wayne hu Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Server: Group Replication Severity:S3 (Non-critical)
Version:8.0.19 OS:CentOS
Assigned to: CPU Architecture:x86
Tags: [MY-011735]

[9 Feb 2:47] wayne hu
Description:
my.cnf has configured as :
group_replication_local_address= "127.0.0.1:33061"
group_replication_group_seeds= "127.0.0.1:33061,127.0.0.1:33062,127.0.0.1:33063"
-------------------------------------------------------------
or like this:
group_replication_local_address= '127.0.0.1:33061'
group_replication_group_seeds= '127.0.0.1:33061,127.0.0.1:33062,127.0.0.1:33063'
-------------------------------------------------------------
when I run command: start group_replication 
mysql report error:
[20:58:30]mysql> START GROUP_REPLICATION;
[20:58:55]
[21:01:51]ERROR 3096 (HY000): The START GROUP_REPLICATION command failed as there was an error when initializing the group communication layer.
-------------------------------------------------------------
and the error log report error:
[16:58:03]2020-02-08T08:57:30.035604Z 2 [Warning] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Peer address " "127.0.0.1:33061" is not valid.'
[16:58:03]2020-02-08T08:57:30.035697Z 2 [Warning] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Peer address "127.0.0.1:33063"" is not valid.'
[16:58:03]2020-02-08T08:57:30.035733Z 2 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Invalid hostname or IP address ( "127.0.0.1:33061") assigned to the parameter local_node!'
[16:58:03]2020-02-08T08:57:30.036025Z 2 [ERROR] [MY-011674] [Repl] Plugin group_replication reported: 'Unable to initialize the group communication engine'
[16:58:03]2020-02-08T08:57:30.036074Z 2 [ERROR] [MY-011637] [Repl] Plugin group_replication reported: 'Error on group communication engine initialization'
[16:58:03]2020-02-08T08:57:30.036106Z 2 [ERROR] [MY-011718] [Repl] Plugin group_replication reported: 'Error calling group communication interfaces while trying to leave the group'

How to repeat:
my.cnf has configured as :
group_replication_local_address= "127.0.0.1:33061"
group_replication_group_seeds= "127.0.0.1:33061,127.0.0.1:33062,127.0.0.1:33063"
-------------------------------------------------------------
or like this:
group_replication_local_address= '127.0.0.1:33061'
group_replication_group_seeds= '127.0.0.1:33061,127.0.0.1:33062,127.0.0.1:33063'
-------------------------------------------------------------
run command: start group_replication 

Suggested fix:
my.cnf can only configured as :
group_replication_local_address='127.0.0.1:33061'
group_replication_group_seeds='127.0.0.1:33061,127.0.0.1:33062,127.0.0.1:33063'
-------------------------------------------------------------

It's not allowed to use Double quotation marks(")
and can't use space after equal sign(=)
[26 Feb 5:12] MySQL Verification Team
Hi,
Thanks for the report. I agree this is a bug. Workaround is simple but should be fixed anyhow.

Thanks
Bogdan
[28 Feb 12:20] Nuno Carvalho
Posted by developer:
 
Hi,

Thank you for the bug report.

I was not able to reproduce it.

Looking to the error
  [16:58:03]2020-02-08T08:57:30.035733Z 2 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Invalid hostname or IP address (?"127.0.0.1:33061") assigned to the parameter local_node!'
we can see a question mark on the group_replication_local_address value, this is a indication that the my.cnf has a encoding that was not understood.

Can you please check what is your my.cnf encoding?

Best regards,
Nuno Carvalho
[28 Feb 12:38] wayne hu
vi my.cnf
# Disable other storage engines
#
disabled_storage_engines="MyISAM,BLACKHOLE,FEDERATED,ARCHIVE,MEMORY"
#
# Replication configuration parameters
  fileencoding=utf-8
#
# Replication configuration parameters
#
server_id=4401
gtid_mode=ON
enforce_gtid_consistency=ON
binlog_checksum=NONE
master_info_repository=TABLE
relay_log_info_repository=TABLE
#
# Group Replication configuration
#
transaction_write_set_extraction=XXHASH64
group_replication_group_name="aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
group_replication_start_on_boot=on
group_replication_local_address='127.0.0.1:33061'
group_replication_group_seeds='127.0.0.1:33061,127.0.0.1:33062,127.0.0.1:33063'
~
~
~
~
~
~
~
~
  fileencoding=utf-8
--------------------------------------
My my.cnf encoding is utf-8
=========================================

[16:58:03]2020-02-08T08:57:30.035604Z 2 [Warning] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Peer address " "127.0.0.1:33061" is not valid.'
[16:58:03]2020-02-08T08:57:30.035697Z 2 [Warning] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Peer address "127.0.0.1:33063"" is not valid.'
[16:58:03]2020-02-08T08:57:30.035733Z 2 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Invalid hostname or IP address ( "127.0.0.1:33061") assigned to the parameter local_node!'
[16:58:03]2020-02-08T08:57:30.036025Z 2 [ERROR] [MY-011674] [Repl] Plugin group_replication reported: 'Unable to initialize the group communication engine'
[16:58:03]2020-02-08T08:57:30.036074Z 2 [ERROR] [MY-011637] [Repl] Plugin group_replication reported: 'Error on group communication engine initialization'
[16:58:03]2020-02-08T08:57:30.036106Z 2 [ERROR] [MY-011718] [Repl] Plugin group_replication reported: 'Error calling group communication interfaces while trying to leave the group'
-----------------------------------------------------------------
the error was copy from error log,and there wasn't question mark
-----------------------------------------------------------------
you can add space after equal sign(=) 

such as :
group_replication_local_address = "......."
[28 Feb 14:10] Nuno Carvalho
Posted by developer:
 
Hi Waine,

I'm unable to reproduce this.

What is the output of?
  file -i my.cnf

Can you please upload your my.cnf?

What is your operating system default encoding?

Best regards,
Nuno Carvalho