The Deprecation of qpress/QuickLZ Compression Algorithm

To reduce the backup size, save storage space, and speed up the backup and restore process, you can compress a backup with Percona XtraBackup. The XtraBackup --compress option makes XtraBackup compress all output data, including the transaction log file and metadata files, with one of the supported compression algorithms. To decompress all files in a backup made with the --compress option, use the --decompress option.

Version changes

• With Percona XtraBackup 8.0.34-29, qpress/QuickLZ is no longer supported for compress operations. The Zstandard (ZSTD) compression algorithm is moved to General Availability. With this version, ZSTD becomes the default compression algorithm for the --compress option. The alternative compression algorithm is LZ4.

  To compress files using the ZSTD compression algorithm, use the --compress option:

  xtrabackup --backup --compress --target-dir=/data/backup

  To compress files using the LZ4 compression algorithm, set the --compress option to LZ4:

  xtrabackup --backup --compress=lz4 --target-dir=/data/backup

  To decompress all files in a backup, use the --decompress option:

  xtrabackup --decompress --target-dir=/data/compressed/

  To decompress backups taken by older versions of Percona XtraBackup that used a QuickLZ compression algorithm, the --decompress option still supports qpress for backward compatibility.

• Up to Percona XtraBackup 8.0.33-28, the --compress option uses a QuickLZ compression algorithm by default. When using --compress, the resulting files have the qpress (*.qp) archive format. 

  To compress files using the QuickLZ compression algorithm, use the --compress option:

  xtrabackup --backup --compress --target-dir=/data/backup

  Every *.qp file produced by XtraBackup is a one-file qpress archive. You can extract the contents of these files with the --decompress option that supports the qpress file archiver.

• Starting with Percona XtraBackup 8.0.31-24, the use of qpress/QuickLZ to compress backups is deprecated. Percona recommends using either LZ4 or ZSTD compression algorithms.

• Percona XtraBackup 8.0.30-23 adds ZSTD compression algorithm in tech preview. ZSTD is a fast lossless compression algorithm that targets real-time compression scenarios and better compression ratios. 

  To compress files using the ZSTD compression algorithm, set the --compress option to zstd.

  xtrabackup --backup --compress=zstd --target-dir=/data/backup

  The --compress=zstd option produces *.zst files. You can extract the contents of these files with the --decompress option.

  Also, you can specify the ZSTD compression level with the --compress-zstd-level(=#) option as follows:

  xtrabackup --backup --compress --compress-zstd-level=1 --target-dir=/data/backup

Percona XtraBackup is a free, open source, complete online backup solution for all versions of Percona Server for MySQL and MySQL. It performs online non-blocking, tightly compressed, highly secure backups on transactional systems so that applications remain fully available during planned maintenance windows.

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