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upgra from mysql 5.6 to 5.7

Silviu CarageaSilviu Caragea EntrantLegacy User Role Beginner
Based on percona update procedure (https://www.percona.com/doc/percona-server/5.7/upgrading_guide_56_57.html) you need to do :

sudo service mysql stop
sudo apt-get install percona-server-server-5.7
sudo mysql_upgrade
sudo service mysql restart

In my case I have a cluster with 3 nodes (multi-master):

My questions are :

1. Do I need to run mysql_upgrade on all nodes or only on first one upgraded ?
2. Is there any problem if until I complete update on all nodes some of them will run 5.6 and some 5.7 ?

Kind regards,
Silviu

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