All nodes in the cluster should have a synchronized system date-time.

All nodes share sandboxes stored on a shared or replicated filesystem. The filesystem shared among all nodes is single point of failure. Thus, the use of a replicated filesystem is strongly recommended.

All nodes share a DB, thus it must support transactions. I.e. The MySQL table engine, MyISAM, may cause strange behaviour because it is not transactional.

All nodes share a DB, which is a single point of failure. Use of a clustered DB is strongly recommended.

Configure the license as "license.file" for this property on Tomcat. Do not use clover_license.war. Tomcat loads web-apps in an unpredictable order and for the cluster, the license must be loaded before CloverETL Server itself.