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This release is purely composed of bug fixes and is the current stable release of Percona XtraBackup.
xtrabackup_binary was not included in tar archive when streaming, instead it was written to the current directory. This could lead to a wrong xtrabackup binary being used when preparing backups created with the --stream or --remote-host options. Bugs fixed #723318 and #787988 (Stewart Smith).
FLUSH TABLES WITH READ LOCK was not used when creating incremental backups, which could lead to inconsistent backups when updates to non-InnoDB tables or DDL statements on any tables occurred during the backup process. Bug fixed #771981 (Alexey Kopytov).
Option --safe-slave-backup was resulting in incorrect binlog info, because in some cases innobackupex confused the response from SHOW SLAVE STATUS with the one from SHOW MASTER STATUS. Bug fixed #977101 (Alexey Kopytov).
innodb_data_file_path was not written to backup-my.cnf, this was a regression introduced in XtraBackup 1.6.5. Bug fixed #983685 (Sergei Glushchenko).
Fixed spurious test suite failures with grep 2.10. Bug fixed #996483 (Alexey Kopytov).
When innobackupex was running with --apply-log, it was reading configuration from the server configuration file instead of backup-my.cnf in backup directory. Bug fixed #996493 (Sergei Glushchenko).
innobackupex could copy files to a wrong directory when merging an incremental backup to a full one. Bug fixed #1002688 (Alexey Kopytov).
XtraBackup binary was leaking file descriptors on --backup. This was fixed by reusing the existing file descriptor so no leak occurs. Bug fixed #713267 (Alexey Kopytov).
Other bugs fixed: bug #1021954 (Hrvoje Matijakovic).