Changes in MySQL NDB Cluster 7.5.27 (5.7.39-ndb-7.5.27) (2022-07-27, General Availability)

MySQL NDB Cluster 7.5.27 is a new release of MySQL NDB Cluster 7.5, based on MySQL Server 5.7 and including features in version 7.5 of the NDB storage engine, as well as fixing recently discovered bugs in previous NDB Cluster releases.

Obtaining MySQL NDB Cluster 7.5.  MySQL NDB Cluster 7.5 source code and binaries can be obtained from https://dev.mysql.com/downloads/cluster/.

For an overview of changes made in MySQL NDB Cluster 7.5, see What is New in NDB Cluster 7.5.

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 5.7 through MySQL 5.7.39 (see Changes in MySQL 5.7.39 (2022-07-26, General Availability)).

Bugs Fixed

• NDB Cluster APIs: The internal function NdbThread_SetThreadPrio() sets the thread priority (thread_prio) for a given thread type when applying the setting of the ThreadConfig configuration parameter. It was possible for this function in some cases to return an error when it had actually succeeded, which could have a an unfavorable impact on the performance of some NDB API applications. (Bug #34038630)

• Path lengths were not always calculated correctly by the data nodes. (Bug #33993607)

• The internal function NdbReceiver::unpackRecAttr(), which unpacks attribute values from a buffer from a GSN_TRANSID_AI signal, did not check to ensure that attribute sizes fit within the buffer. This could corrupt the buffer which could in turn lead to reading beyond the buffer and copying beyond destination buffers. (Bug #33941167)

• Some NDB internal signals were not always checked properly. (Bug #33896428)