# Percona XtraDB Cluster 8.0.21-12.1


* **Date**

    December 28, 2020



* **Installation**

    [Installing Percona XtraDB Cluster](https://docs.percona.com/percona-xtradb-cluster/8.0/install-index.html)


Percona XtraDB Cluster 8.0.21-12.1 includes all of the features and bug fixes available in Percona Server for MySQL. See the corresponding [release notes for Percona Server for MySQL 8.0.21-12](https://www.percona.com/doc/percona-server/LATEST/release-notes/Percona-Server-8.0.21-12.html) for more details on these changes.

Implement an inconsistency voting policy. In the best case scenario, the node with the inconsistent data is aborted and the cluster continues to operate.

## Improvements


* [PXC-2574](https://jira.percona.com/browse/PXC-2574): Improve messaging for “BF lock wait long” timeout

## Bugs Fixed


* [PXC-3353](https://jira.percona.com/browse/PXC-3353): Modify error handling in Garbd when donor crashes during SST or when an invalid donor name is passed to it


* [PXC-3468](https://jira.percona.com/browse/PXC-3468): Resolve package conflict when installing PXC 5.7 on RHEL/CentOS8


* [PXC-3418](https://jira.percona.com/browse/PXC-3418): Prevent DDL-DML deadlock by making in-place ALTER take shared MDL for the whole duration.


* [PXC-3416](https://jira.percona.com/browse/PXC-3416): Fix memory leaks in garbd when started with invalid group name


* [PXC-3445](https://jira.percona.com/browse/PXC-3445): Correct MTR test failures


* [PXC-3442](https://jira.percona.com/browse/PXC-3442): Fix crash when log_slave_updates=ON and consistency check statement is executed


* [PXC-3424](https://jira.percona.com/browse/PXC-3424): Fix error handling when the donor is not able to serve SST


* [PXC-3404](https://jira.percona.com/browse/PXC-3404): Fix memory leak in garbd while processing CC actions


* [PXC-3191](https://jira.percona.com/browse/PXC-3191): Modify Read-Only checks on wsrep_\* tables when in super_read_only

## Known Issues (unfixed problems that you should be aware of)


* [PXC-3039](https://jira.percona.com/browse/PXC-3039): No useful error messages if an SSL-disabled node tries to join an SSL-enabled cluster


* [PXC-3092](https://jira.percona.com/browse/PXC-3092): Log a warning at startup if a keyring is specified but cluster traffic encryption is turned off


* [PXC-3093](https://jira.percona.com/browse/PXC-3093): Completed SST Transfer incorrectly logged by garbd (Timing is not correct)


* [PXC-3159](https://jira.percona.com/browse/PXC-3159): Modify the error handling to close the communication channels and abort the joiner node when the donor crashes