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MySQL NDB Cluster 7.4 Release Notes  /  Changes in MySQL NDB Cluster 7.4.27 (5.6.47-ndb-7.4.27) (2020-01-14, General Availability)

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

MySQL NDB Cluster 7.4.27 is a new release of MySQL NDB Cluster 7.4, based on MySQL Server 5.6 and including features in version 7.4 of the NDB storage engine, as well as fixing recently discovered bugs in previous NDB Cluster releases.

Obtaining MySQL NDB Cluster 7.4.  MySQL NDB Cluster 7.4 source code and binaries can be obtained from

For an overview of changes made in MySQL NDB Cluster 7.4, see What is New in NDB Cluster 7.4.

This release also incorporates all bug fixes and changes made in previous NDB Cluster releases, as well as all bug fixes and feature changes which were added in mainline MySQL 5.6 through MySQL 5.6.47 (see Changes in MySQL 5.6.47 (2020-01-13, 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)