Skip to content
logo
Percona XtraDB Cluster
Percona XtraDB Cluster 8.0.25-15.1
Initializing search
    percona/pxc-docs
    percona/pxc-docs
    • Home
      • About Percona XtraDB Cluster
      • Percona XtraDB Cluster limitations
      • Understand version numbers
      • Quick start guide for Percona XtraDB Cluster
      • Install Percona XtraDB Cluster
      • Configure nodes for write-set replication
      • Bootstrap the first node
      • Add nodes to cluster
      • Verify replication
      • High availability
      • PXC strict mode
      • Online schema upgrade
      • Non-Blocking Operations (NBO) method for Online Scheme Upgrades (OSU)
      • Security basics
      • Secure the network
      • Encrypt PXC traffic
      • Enable AppArmor
      • Enable SELinux
      • State snapshot transfer
      • Percona XtraBackup SST configuration
      • Restart the cluster nodes
      • Cluster failover
      • Monitor the cluster
      • Certification in Percona XtraDB Cluster
      • Percona XtraDB Cluster threading model
      • Understand GCache and Record-Set cache
      • GCache encryption and Write-Set cache encryption
      • Perfomance Schema instrumentation
      • Data at Rest Encryption
      • Upgrade Percona XtraDB Cluster
      • Crash recovery
      • Configure Percona XtraDB Cluster on CentOS
      • Configure Percona XtraDB Cluster on Ubuntu
      • Set up Galera arbitrator
      • How to set up a three-node cluster on a single box
      • How to set up a three-node cluster in EC2 environment
      • Load balancing with HAProxy
      • Load balancing with ProxySQL
      • ProxySQL admin utilities
      • Setting up a testing environment with ProxySQL
      • Release notes index
      • Percona XtraDB Cluster 8.0.31-23 (2023-03-14)
      • Percona XtraDB Cluster 8.0.30-22.md (2022-12-28)
      • Percona XtraDB Cluster 8.0.29-21 (2022-09-12)
      • Percona XtraDB Cluster 8.0.28-19.1 (2022-07-19)
      • Percona XtraDB Cluster 8.0.27-18.1
      • Percona XtraDB Cluster 8.0.26-16.1
      • Percona XtraDB Cluster 8.0.25-15.1
        • Release Highlights
        • New Features
        • Bugs Fixed
      • Percona XtraDB Cluster 8.0.23-14.1
      • Percona XtraDB Cluster 8.0.22-13.1
      • Percona XtraDB Cluster 8.0.21-12.1
      • Percona XtraDB Cluster 8.0.20-11
      • Percona XtraDB Cluster 8.0.20-11.3
      • Percona XtraDB Cluster 8.0.20-11.2
      • Percona XtraDB Cluster 8.0.19-10
      • Percona XtraDB Cluster 8.0.18-9.3
      • Index of wsrep status variables
      • Index of wsrep system variables
      • Index of wsrep_provider options
      • Index of files created by PXC
      • Frequently asked questions
      • Glossary
      • Copyright and licensing information
      • Trademark policy

    • Release Highlights
    • New Features
    • Bugs Fixed

    Percona XtraDB Cluster 8.0.25-15.1¶

    • Date

      November 22, 2021

    • Installation

      Installing Percona XtraDB Cluster.

    Percona XtraDB Cluster 8.0.25-15.1 includes all of the features and bug fixes available in Percona Server for MySQL. See the corresponding release notes for Percona Server for MySQL 8.0.25-15 for more details on these changes.

    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¶

    A Non-Blocking Operation method for online schema changes in Percona XtraDB Cluster. This mode is similar to the Total Order Isolation (TOI) mode, whereas a data definition language (DDL) statement (for example, ALTER) is executed on all nodes in sync. The difference is that in the NBO mode, the DDL statement acquires a metadata lock that locks the table or schema at a late stage of the operation, which is a more efficient locking strategy.

    Note that the NBO mode is a Tech Preview feature. We do not recommend that you use this mode in a production environment. For more information, see Non-Blocking Operations (NBO) method for Online Scheme Upgrades (OSU).

    The notable changes and bug fixes introduced by Oracle MySQL include the following:

    • The sql_slave_skip_counter variable only counts the events in the uncompressed transaction payloads.

    • A possible deadlock occurred when system variables, read by different clients, were being updated and the binary log file was rotated.

    • Sometimes the aggregate function results could return values from a previous statement when using a prepared SELECT statement with a WHERE clause that is always false.

    For more information, see the MySQL 8.0.24 Release Notes and the MySQL 8.0.25 Release Notes.

    New Features¶

    • PXC-3265 Implements the Non-Blocking Operations (NBO) mode for an Online schema upgrade.

    Bugs Fixed¶

    • PXC-3275: Fix the documented APT package list to match the packages listed in the Repo. (Thanks to user Hubertus Krogmann for reporting this issue)

    • PXC-3387: Performing an intermediate commit does not call wsrep commit hooks.

    • PXC-3449: Fix for missing dependencies which were carried out in replication writesets caused Galera to fail.

    • PXC-3589: Documentation: Updates in Percona XtraDB Cluster Limitations that the LOCK=NONE clause is no longer allowed in an INPLACE ALTER TABLE statement. (Thanks to user Brendan Byrd for reporting this issue)

    • PXC-3611: Fix that deletes any keyring.backup file if it exists for SST operation.

    • PXC-3608: Fix a concurrency issue that caused a server exit when attempting to read a foreign key.

    • PXC-3637: Changes the service start sequence to allow more time for mounting local or remote directories with large amounts of data. (Thanks to user Eric Gonyea for reporting this issue)

    • PXC-3679: Fix for SST failures after the update of socat to ‘1.7.4.0’.

    • PXC-3706: Fix adds a wait to wsrep_after_commit until the first thread in a group commit queue is available.

    • PXC-3729: Fix for conflicts when multiple applier threads execute certified transactions and are in High-Priority transaction mode.

    • PXC-3731: Fix for incorrect writes to the binary log when sql_log_bin=0.

    • PXC-3733: Fix to clean the WSREP transaction state if a transaction is requested to be re-prepared.

    Contact us

    For free technical help, visit the Percona Community Forum.

    To report bugs or submit feature requests, open a JIRA ticket.

    For paid support and managed or consulting services , contact Percona Sales.


    Last update: 2022-08-24
    Percona LLC and/or its affiliates, © 2023
    Made with Material for MkDocs

    Cookie consent

    We use cookies to recognize your repeated visits and preferences, as well as to measure the effectiveness of our documentation and whether users find what they're searching for. With your consent, you're helping us to make our documentation better.