MySQL NDB Cluster 7.2 Release Notes
NDB Disk Data: Stale data from NDB Disk Data tables that had been dropped could potentially be included in backups due to the fact that disk scans were enabled for these. To prevent this possibility, disk scans are now disabled—as are other types of scans—when taking a backup. (Bug #84422, Bug #25353234)
NDB Disk Data:
In some cases, setting dynamic in-memory columns of an NDB Disk
Data table to NULL
was not handled correctly.
(Bug #79253, Bug #22195588)