# Percona XtraDB Cluster 5.7.38-31.59 (2022-06-29)

Percona XtraDB Cluster (PXC) supports critical business applications in your public, private, or hybrid cloud environment. Our free, open source, enterprise-grade solution includes the high availability and security features your business requires to meet your customer expectations and business goals.

## Release Highlights

Improvements and bug fixes for MySQL 5.7.38, provided by Oracle, and included in Percona Server for MySQL are the following:

* In certain scenarios, a MySQL server connection could fail if the .ibd file for the partition was missing.

* A statement was not written to the slow query log if the statement contained errors and could not be parsed.

Find the complete list of bug fixes and changes in [MySQL 5.7.38 Release Notes](https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-38.html).

## Bugs Fixed

* [PXC-3118](https://jira.percona.com/browse/PXC-3118): A fix for when, using a thread pool, a brute force abort for a metadata locking (MDL) subsystem conflict stalled.

* [PXC-3951](https://jira.percona.com/browse/PXC-3951): Updated how sst-idle-timeout calculates disk usage. The default timeout value for the variable is 120 seconds. If the joiner node does not detect a disk usage difference in that time, the node terminates the SST. The current calculation could return the same value for 120 seconds.

* [PXC-2367](https://jira.percona.com/browse/PXC-2367): When enabled, the event scheduler filled the error logs with a “Ready state reached” message. The message’s logging level was reduced to “debug” and only logged in the error logs when wsrep_debug = 1.

* [PXC-3961](https://jira.percona.com/browse/PXC-3961): Reduced the strictness of checks which had marked GNo=0 invalid. In Percona XtraDB Cluster, writesets are replicated to other nodes with GNo=0. The generation of seqno or GTID occurs later in the pre-commit phase. A recent version had increased the strictness of these checks which caused the GTID event from 5.6 to be considered invalid.

## Useful Links

The [Percona XtraDB Cluster installation instructions](https://www.percona.com/doc/percona-xtradb-cluster/5.7/install/index.html)

The [Percona XtraBackup downloads](https://www.percona.com/downloads/Percona-XtraDB-Cluster-57/LATEST/)

The [Percona XtraBackup GitHub location](https://github.com/percona/percona-xtradb-cluster)

To contribute to the documentation, review the [Documentation Contribution Guide](https://github.com/percona/pxc-docs/blob/8.0/contributing.md)