diff --git a/docs/release-notes/8.4.0-2.md b/docs/release-notes/8.4.0-2.md new file mode 100644 index 00000000..0ef31d22 --- /dev/null +++ b/docs/release-notes/8.4.0-2.md @@ -0,0 +1,92 @@ +# Percona XtraBackup 8.4.0-2 (2024-12-16) + +Get started with [Quickstart Guide for Percona XtraBackup]. + +## Release highlights + +Percona XtraBackup 8.4.0-2 merges the MySQL 8.4 code base and introduces Percona XtraBackup 8.4.0-2 Pro build, in addition to the regular community builds. + +Percona XtraBackup 8.4.0-2 Pro build includes the [capabilities](pxb-pro.md#capabilities) that are typically requested by large enterprises. These Pro builds are specifically created and tested by Percona, and the corresponding packages are supported only for Percona customers with a valid subscription. + +Percona XtraBackup 8.4.0-2 Pro build is available for the following platforms: + +* Oracle Linux 9 + +* Ubuntu (22.04) + +* Ubuntu (24.04) + +* Debian (12) + +Percona XtraBackup 8.4.0-2 Pro build includes the [`Reduced backup lock time`](../reduction-in-locks.md) feature. With the addition of the [`--lock-ddl=REDUCED`](./xtrabackup-option-reference.md#lock-ddl) option this feature minimizes the time the server remains locked by xtrabackup during both full and incremental backups. Now, you can execute `Data Definition Language` (DDL) operations while the backup is in progress. + +### Benefits + +The `--lock-ddl=REDUCED` option features are as follows: + +* Acquire and release the backup lock quickly: The backup process minimizes the time it holds the backup lock, allowing for concurrent DDL operations. + + ??? note "Comparing the backup duration with --lock-ddl=REDUCED" + + While we strive to provide accurate performance benchmarks, real-world results may vary depending on your hardware and software configurations. + + The following tables illustrate the approximate time differences between `--lock-ddl=ON` and `--lock-ddl=REDUCED` for local and cloud backups (Amazon S3). The `Improvement (X times)` column shows how many times less the server is locked by xtrabackup using `--lock-ddl=REDUCED` compared to `--lock-ddl=ON`. + + === "Local backup" + + | Data size in gigabytes | Backup duration with --lock-ddl=ON in seconds| Backup duration with --lock-ddl=REDUCED in seconds| Improvement (X times) | + |-----------------------------|---------------|--------------------|--------------------------| + | 50 GB | 460.2 sec | 2.169 sec | 212.17 | + | 100 GB | 901.8 sec | 1.305 sec | 691.03 | + | 200 GB | 1820.4 sec | 1.347 sec | 1351.45 | + | 400 GB | 3580.2 sec | 1.24 sec | 2887.26 | + | 500 GB | 5436 sec | 1.264 sec | 4300.63 | + + === "Cloud (Amazon s3) backup" + + | Data size in gigabytes | Backup duration with --lock-ddl=ON in seconds | Backup duration with --lock-ddl=REDUCED in seconds | Improvement (X times) | + |----------------------------|---------------|--------------------|--------------------------| + | 50 GB | 469.8 sec | 3.859 sec | 121.74 | + | 100 GB | 927.6 sec | 4.072 sec | 227.80 | + | 200 GB | 1851.6 sec | 4.408 sec | 420.05 | + | 400 GB | 3888 sec | 3.948 sec | 984.80 | + | 500 GB | 4896 sec | 4.065 sec | 1204.43 | + + Using `--lock-ddl=REDUCED` leads to a dramatic reduction in backup time compared to `--lock-ddl=ON`, especially with larger data sizes. + +* Track changes with redo logs: Redo logs record all file-level changes, ensuring data consistency during the backup process. +* Handle DDL operations: The backup process generates metadata files to account for any DDL operations that occur while the backup is in progress. +* Ensure consistency: The `--prepare` step processes generated metadata files and uses redo and undo logs to create a consistent database state. + +### Limitations + +* Certain DDL operations consume significant resources, and xtrabackup simultaneously requires I/O to copy and read files. This requirement can increase resource demand from DDL operations during the backup process. + +* The master key rotation with the `ALTER INSTANCE ROTATE INNODB MASTER KEY` is prohibited while backup is in progress. + +* Backups may be larger because new `DDL` operations are executed concurrently on the server, and the files generated by the server are included in the backup. Additionally, certain `DDL` operations, such as `ADD INDEX` or encryption changes to existing data files, will cause the data files to be recopied, increasing the backup size. + +* The number of open file handles in your operating system should be configured to match the number of files in the server data directory. + +* Taking a backup using [page tracking](..//page-tracking.md) is not supported with `--lock-ddl=REDUCED` option. + +## Pro Features + +[PXB-3269](https://perconadev.atlassian.net/browse/PXB-3269): Reduces the time the server is locked by `xtrabackup` during full and incremental backups. + +## Bug fixes + +* [PXB-3399](https://perconadev.atlassian.net/browse/PXB-3399): Taking a backup on replica faild (Thanks to Hubertus Krogmann +for reporting this issue.) + +* [PXB-3168](https://perconadev.atlassian.net/browse/PXB-3168): Taking a backup under high write load faild with `log block numbers mismatch` error. This fix was originally made for version 8.0 and later added to version 8.4. This fix was accidentally omitted in a previous release. + +## Additional resources + +Install [Percona XtraBackup 8.4.0-2](..//installation.md) + +The [Percona XtraBackup GitHub repository](https://github.com/percona/percona-xtrabackup) + +Download product binaries, packages, and tarballs at [Percona Product Downloads](https://www.percona.com/downloads) + +[Quickstart Guide for Percona XtraBackup]: ..//quickstart-overview.md \ No newline at end of file diff --git a/docs/release-notes/release-notes.md b/docs/release-notes/release-notes.md index 1f12c823..502611dc 100644 --- a/docs/release-notes/release-notes.md +++ b/docs/release-notes/release-notes.md @@ -1,4 +1,6 @@ # Percona XtraBackup {{vers}} release notes index +* [Percona XtraBackup 8.4.0-2 (2024-12-16)](8.4.0-2.md) + * [Percona XtraBackup 8.4.0-1 (2024-08-20)](8.4.0-1.md) diff --git a/mkdocs-base.yml b/mkdocs-base.yml index f9744d7a..d1cb37fa 100644 --- a/mkdocs-base.yml +++ b/mkdocs-base.yml @@ -123,7 +123,7 @@ plugins: with-pdf: # https://github.com/orzih/mkdocs-with-pdf output_path: '_pdf/PerconaXtrabackup-8.2.pdf' cover_title: 'Percona XtraBackup Documentation' - cover_subtitle: 8.4.0-1 (2024-08-20) + cover_subtitle: 8.4.0-2 (2024-12-16) author: 'Percona Technical Documentation Team' cover_logo: docs/_static/Percona_Logo_Color.png debug_html: false @@ -145,6 +145,7 @@ nav: - Home: index.md - Release notes: - Release notes index: release-notes/release-notes.md + - release-notes/8.4.0-2.md - release-notes/8.4.0-1.md - Quickstart Guide: - quickstart-overview.md diff --git a/variables.yml b/variables.yml index ad484d57..19a3aa49 100644 --- a/variables.yml +++ b/variables.yml @@ -1,8 +1,8 @@ # variables for HTML output -release: '8.4.0-1' +release: '8.4.0-2' version: '8.4' vers: '8.4' # is used in links and to specify a product version pkg: 'pxb-84-lts' -release-date: '2024-08-20' -title_date: '2024-08-20' +release-date: '2024-12-16' +title_date: '2024-12-16'