Changes in MySQL NDB Cluster 7.4.27 (5.6.47-ndb-7.4.27) (2020-01-14, General Availability)

Bugs Fixed

• If a transaction was aborted while getting a page from the disk page buffer and the disk system was overloaded, the transaction hung indefinitely. This could also cause restarts to hang and node failure handling to fail. (Bug #30397083, Bug #30360681)

  References: See also: Bug #30152258.

• The maximum global checkpoint (GCP) commit lag and GCP save timeout are recalculated whenever a node shuts down, to take into account the change in number of data nodes. This could lead to the unintentional shutdown of a viable node when the threshold decreased below the previous value. (Bug #27664092)

  References: See also: Bug #26364729.

• Concurrent SELECT and ALTER TABLE statements on the same SQL node could sometimes block one another while waiting for locks to be released. (Bug #17812505, Bug #30383887)