MYSQL cluster issue: shutdown data node correctly breaks replication

I faced issue on mysql cluster (5.7.28), i shuted down properly vm6 (data nodes) and the mysql replication was broken, i’m trying to make the link bettwen the datanode down and the replication broken but i still can’t find the reason (below the relevant), is there someone who can help me to find the link

Slave: Got error 4009 ‘Cluster Failure’ from NDB Error_code: 1296 [Warning] Slave: Can’t lock file (errno: 157 – Could not connect to storage engine) Error_code: 1015 Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with "SLAVE START".