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MySQL NDB Cluster 7.3 Release Notes  /  Changes in MySQL NDB Cluster 7.3.23 (5.6.42-ndb-7.3.23) (2018-10-23, General Availability)

Changes in MySQL NDB Cluster 7.3.23 (5.6.42-ndb-7.3.23) (2018-10-23, General Availability)

MySQL NDB Cluster 7.3.23 is a new release of NDB Cluster, based on MySQL Server 5.6 and including features from version 7.3 of the NDB storage engine, as well as fixing a number of recently discovered bugs in previous NDB Cluster releases.

Obtaining MySQL NDB Cluster 7.3.  MySQL NDB Cluster 7.3 source code and binaries can be obtained from https://dev.mysql.com/downloads/cluster/.

For an overview of changes made in MySQL NDB Cluster 7.3, see What is New in NDB Cluster 7.3.

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 5.6.42 (see Changes in MySQL 5.6.42 (2018-10-22, General Availability)).

Bugs Fixed

  • Having a large number of deferred triggers could sometimes lead to job buffer exhaustion. This could occur due to the fact that a single trigger can execute many operations—for example, a foreign key parent trigger may perform operations on multiple matching child table rows—and that a row operation on a base table can execute multiple triggers. In such cases, row operations are executed in batches. When execution of many triggers was deferred—meaning that all deferred triggers are executed at pre-commit—the resulting concurrent execution of a great many trigger operations could cause the data node job buffer or send buffer to be exhausted, leading to failure of the node.

    This issue is fixed by limiting the number of concurrent trigger operations as well as the number of trigger fire requests outstanding per transaction.

    For immediate triggers, limiting of concurrent trigger operations may increase the number of triggers waiting to be executed, exhausting the trigger record pool and resulting in the error Too many concurrently fired triggers (increase MaxNoOfFiredTriggers. This can be avoided by increasing MaxNoOfFiredTriggers, reducing the user transaction batch size, or both. (Bug #22529864)

    References: See also: Bug #18229003, Bug #27310330.