Known issues and limitations

There is a number of Percona XtraBackup related issues with compressed InnoDB tables. These issues result from either server-side bugs, or OS configuration and thus, cannot be fixed on the Percona XtraBackup side.

Known issues:

  • For MySQL or Percona Server versions 5.1 and 5.5 there are known and unfixed bugs with redo-logging of updates to compressed InnoDB tables. For example, internal Oracle bug #16267120 has been fixed only in MySQL 5.6.12, but not in 5.1 or 5.5. The bug is about compressed page images not being logged on page reorganization and thus, creating a possibility for recovery process to fail in case a different zlib version is being used when replaying a MLOG_ZIP_PAGE_REORGANIZE redo log record.
  • For MySQL or Percona Server version 5.6 it is NOT recommended to set innodb_log_compressed_pages=OFF for servers that use compressed InnoDB tables which are backed up with Percona XtraBackup. This option makes InnoDB recovery (and thus, backup prepare) sensible to zlib versions. In case the host where a backup prepare is performed uses a different zlib version than the one that was used by the server during runtime, backup prepare may fail due to differences in compression algorithms.

Limitations:

  • The Aria storage engine is part of MariaDB and has been integrated in it for many years and Aria table files backup support has been added to innobackupex in 2011. The issue is that the engine uses recovery log files and an aria_log_control file that are not backuped by innobackupex. As stated in the documentation, starting MariaDB without the maria_log_control file will mark all the Aria tables as corrupted with this error when doing a CHECK on the table : Table is from another system and must be zerofilled or repaired to be usable on this system. This means that the Aria tables from an innobackupex backup must be repaired before being usable (this could be quite long depending on the size of the table). Another option is aria_chk --zerofil table on all Aria tables present on the backup after the prepare phase.

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