认识
MySQL Cluster，MySQL NDB Cluster，
is MySQL NDB Cluster free? MySQL NDB Cluster (Community Edition): This is the open-source version of NDB Cluster, licensed under the GNU General Public License (GPL). It is free to download and use, but the GPL license has implications for how you can use and distribute applications that link to it. If you are developing applications for distribution, you may need to consider the licensing requirements.
2.6.1 Differences Between the NDB and InnoDB Storage Engines | https://dev.mysql.com/doc/mysql-cluster-excerpt/8.0/en/mysql-cluster-ndb-innodb-engines.html
参考
Wikipedia / MySQL Cluster / https://en.wikipedia.org/wiki/MySQL_Cluster