compression and multithreads for async-rebuild-server

Let s start for the basic command:

maxctrl call command mariadbmon async-rebuild-server MariaDB-Monitor server-2

maxscale will:
rm -rf /var/lib/mysql/* #on server-2

#from the donor to server-2
mariabackup --backup --stream=xbstream --user=maxscale --password=*** | ssh root@server-2 "mbstream -x -C /var/lib/mysql"

#on server-2 prepare:
mariabackup --prepare --target-dir=/var/lib/mysql

chown -R mysql:mysql /var/lib/mysql

systemctl start mariadb

now the command that should better use to should be:

mariabackup --user=root --password=XXXX --backup --tmpdir=/tmp --stream=xbstream --parallel=6 --datadir=/var/lib/mysql/ | pigz -p 4 | ssh root@server-2 " pigz -dc -p 4 | mbstream --directory=/var/lib/mysql -x --parallel=4"

what is missing as parameter are:

• parallel threads for xbstream
• parallel compression thread for pigz
• parallel threads for mbstream
• memory to be used on -prepare command (-use-memory=xGB)

could we get this implemented ? the data size now a day is quite big , we should be able to run instead things like this:

socat -u TCP-LISTEN:4444,reuseaddr stdio | pigz -dc -p 4 | mbstream --directory=/var/lib/mysql -x --parallel=4

mariabackup --user=root --password=XXXX --backup --tmpdir=/tmp --stream=xbstream --parallel=6 --datadir=/var/lib/mysql/ | pigz -p 4 | socat -u stdio TCP:1server-2:4444

mariadb-backup --prepare  --use-memory=4gb --target-dir=/var/lib/mysql/