Percona XtraDB Cluster 8.0.42-33 (2025-06-16)

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Percona XtraDB Cluster 8.0.42-33 includes all the features and bug fixes available in Percona Server for MySQL 8.0.42-33.

Release highlights

Percona XtraDB Cluster is based on Percona Server for MySQL. Find a complete list of improvements and bug fixes in the Percona Server for MySQL 8.0.42-33 (2025-05-19) release notes.

Percona XtraDB Cluster 8.0.42-33

Improves State Snapshot Transfer (SST) failure diagnostics. garbd now uses distinct exit codes to differentiate between donor exit, SST script failure, and garbd-initiated termination, making SST issues easier to identify and debug.

Percona Server for MySQL 8.0.42-33

• Improves the audit_log_filter_set_user() UDF to accept account names with wildcard characters ('%' and '_') in the host part. For example, you can use ‘usr1@%', ‘usr2%192.168.0.%’, or 'usr3@%.mycorp.com'.

• Updates the C++ level of the KMPI library to enhance error handling capabilities.

• Improves optimizer behavior by restoring correct handling of const tables in test_quick_select(). A MySQL Upstream refactor (commit 9a13c1c) removed the QEP_TAB dependency, causing get_quick_record_count() to no longer pass const table information. This could lead to suboptimal range scan boundaries. The applied patch resolves the issue by explicitly passing const_tables to test_quick_select(), ensuring consistent behavior with the pre-refactor logic.

The latest MyRocks storage engine incorporates code based on RocksDB version 9.3.1. Percona has applied minor modifications to the original RocksDB codebase. Check the list of modifications at https://github.com/percona/rocksdb/.

This release adds the following changes to the list of MyRocks variables.

Adds new MyRocks variables

• --rocksdb_bulk_load_compression_parallel_threads
• --rocksdb_bulk_load_enable_unique_key_check
• --rocksdb_debug_skip_bloom_filter_check_on_iterator_bounds
• --rocksdb_enable_udt_in_mem
• --rocksdb_invalid_create_option_action
• --rocksdb_io_error_action
• --rocksdb_table_stats_skip_system_cf
• --rocksdb_use_io_uring
• --rocksdb_enable_instant_ddl
• --rocksdb_enable_instant_ddl_for_append_column
• --rocksdb_enable_instant_ddl_for_column_default_changes
• --rocksdb_enable_instant_ddl_for_drop_index_changes
• --rocksdb_enable_instant_ddl_for_table_comment_changes
• --rocksdb-bulk-load-compression-parallel-threads
• --rocksdb-bulk-load-enable-unique-key-check
• --rocksdb-debug-skip-bloom-filter-check-on-iterator-bounds

Changes default values of MyRocks variables

• --rocksdb_disable_instant_ddl - the default value is changed from ON to OFF.

• --rocksdb_file_checksums - the data type is changed from Boolean to ENUM. Also, the default value is changed from OFF to CHECKSUMS_OFF.

• --rocksdb_compaction_readahead_size - the default value is changed from 0 (zero) to 2097152.

Deprecates MyRocks variable

• --rocksdb_disable_instant_ddl - this variable is being deprecated and is expected to be removed in a future release.

Removes MyRocks variables

• --rocksdb-access-hint-on-compaction-start
• --rocksdb_large_prefix
• --rocksdb_strict_collation_check
• --rocksdb_strict_collation_exceptions

MySQL 8.0.42

Improvements and bug fixes provided by Oracle for MySQL 8.0.42 and included in Percona Server for MySQL are the following:

• Fixed an issue where CHECK TABLE sometimes incorrectly reported that spatial indexes were corrupted. (Bug #37286473)

• Fixed an issue in InnoDB redo log recovery to improve data safety after a crash. (Bug #37061960)

• Fixed an issue where reading index_id values could lead to incorrect behavior with indexes. (Bug #36993445, Bug #37709706)

• Fixed a bug related to the lower_case_table_names setting that caused inconsistent behavior with table names on different systems. (Bug #32288105)

• Fixed a bug where mysqldump did not properly escape certain special characters in its output. (Bug #37540722, Bug #37709163)

• The fprintf_string() function in mysqldump did not use the correct quote character for escaping strings. (Bug #37607195)

Find the complete list of bug fixes and changes in the MySQL 8.0.42 Release Notes.

Improvements

PXC-4645: Improves State Snapshot Transfer (SST) failure diagnostics. garbd now uses distinct exit codes to differentiate between donor exit, SST script failure, and garbd-initiated termination, making SST issues easier to identify and debug.

Bug fixes

• PXC-3576: Percona XtraDB Cluster created role mappings using an upper-case database name when lower_case_table_names=1 was set.

• PXC-4394: Improved error reporting for scenarios where Percona Xtrabackup, used during State Snapshot Transfer (SST), failed to report its version. These failures may be caused by missing libraries or a broken installation.

• PXC-4399: Executing FLUSH TABLES on a table while writes were in progress caused the cluster node to stall.

• PXC-4512: When RENAME TABLE was executed on a child table concurrently with INSERT/UPDATE on a parent table, a Metadata Lock (MDL) BF-BF conflict occured on the replica, causing two cluster nodes to enter NON-PRIMARY state.

• PXC-4629: Creating a temporary table with CREATE TEMPORARY TABLE ... AS SELECT put the entire session into Transaction Ordered Index (TOI ) / Next Binary Operation (NBO) lock state, preventing any queries from being killed within that session.

• PXC-4638: After performing State Snapshot Transfer (SST), the binlog.index file contents became inconsistent, causing the binlog_utils_udf plugin to fail when accessing the binlog file. Was fixed within PS-9777.

• PXC-4657: There was Metadata Lock (MDL) BF-BF conflict between two applier threads.

• PXC-4684: An UPDATE query that referenced two tables but only modified one could cause an Metadata Lock (MDL) BF-BF conflict on other cluster nodes.

• PXC-4664: Executing transactions with the same Global Transaction Identifier (GTID) on different nodes caused a node to exit.

• PXC-4688: A regression in asynchronous replication caused the replica thread to stall when processing empty transactions.

Additional resources

Download product binaries, packages, and tarballs at Percona Product Downloads

Install Percona XtraDB Cluster

The Percona XtraDB Cluster GitHub repository

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