Description:
Scenario: Start server on 8.0.17 with group_replication plugin loaded, on default data directory of 5.7.
Tested with: --upgrade=auto/minimal/force
Observation:-
1. When server is upgraded with --upgrade=auto/force, we are able to connect to server through client. << This is OK.
2. When server is upgraded with --upgrade=minimal, we are NOT able to connect to server through client. << This is NOK.
Concern:- Why server gets hanged i.e. client doesn't able to connect to the server? If there are any issues those must be
reported in error log.
How to repeat:
Details:-
=========
Tested with MySQL Versions:
5.7.27
8.0.17
Steps to repro:-
================
## In 5.7
$ mkdir -p mysql-test/var/mysqld.1/data mysql-test/var/log \
mysql-test/var/tmp/mysqld.1;
$ ./bin/mysqld --no-defaults --datadir=$PWD/mysql-test/var/mysqld.1/data \
--basedir=$PWD --log-error=$PWD/mysql-test/var/log/mysqld.1.err \
--initialize-insecure --core-file 2>&1 &
$ ./bin/mysqld --no-defaults --basedir=$PWD --port=13000 \
--datadir=$PWD/mysql-test/var/mysqld.1/data --socket=/tmp/mysqld.1.sock \
--report-host=localhost --log-error=$PWD/mysql-test/var/log/mysqld.1.err \
--server-id=1 --core-file 2>&1 &
$ ./bin/mysql -uroot -S/tmp/mysqld.1.sock \
-e "set global innodb_fast_shutdown=0; shutdown;";
## Save Data Directory path of 5.7
$ DD57PATH="$PWD/mysql-test/var/mysqld.1/data"
## In 8.0:
$ mkdir -p mysql-test/var/mysqld.4/data mysql-test/var/log \
mysql-test/var/tmp/mysqld.4;
$ ./bin/mysqld --no-defaults --port=13000 --server-id=1 --basedir="$PWD" \
--report-host="localhost" --socket="/tmp/mysqldtrunk.4.sock" \
--datadir="$DD57PATH" \
--log-error="$PWD/mysql-test/var/log/mysqld.4.err" \
--general_log_file="$PWD/mysql-test/var/mysqld.4/mysqld.log" \
--binlog-checksum="NONE" --enforce-gtid-consistency --gtid-mode=ON \
--transaction-write-set-extraction="XXHASH64" \
--plugin-dir="$PWD/../plugin_output_directory/" \
--plugin-load="group_replication.so" \
--group_replication_group_name="baaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa" \
--upgrade=MINIMAL \
--core-file 2>&1 &
$ ./mysql -uroot -S/tmp/mysqldtrunk.4.sock << Observe that it hangs.
Suggested fix:
Workaround: --upgrade=auto/force OR no --upgrade option.
