This release is the current GA (Generally Available) stable release in the 2.1 series.
Percona XtraBackup now supports logs created with the new log block checksums option innodb_log_checksum_algorithm in Percona Server 5.6
New innobackupex --force-non-empty-directories option has been implemented. When specified, it makes innobackupex --copy-back option or innobackupex --move-back option transfer files to non-empty directories. No existing files will be overwritten. If --copy-back or --move-back has to copy a file from the backup directory which already exists in the destination directory, it will still fail with an error.
A fixed initialization vector (constant string) was used while encrypting the data. This opened the encrypted stream/data to plaintext attacks among others. Bug fixed #1185343.
xtrabackup_slave_info didn’t contain any GTID information, which could cause master_auto_position not to work properly. Bug fixed #1239670.
Percona XtraBackup now supports absolute paths in innodb_data_file_path variable. Bug fixed #382742.
innobackupex wasn’t able to perform backups to the NFS mount in some NFS configurations, because it was trying to preserve file ownership. Bug fixed #943750.
Percona XtraBackup wouldn’t back up the empty directory created with mkdir (i.e. test) outside of the server which could lead to inconsistencies during the Percona XtraDB Cluster State Snapshot Transfer. Bug fixed #1217426.
Race condition in start_query_killer child code could cause parent MySQL connection to close. Bug fixed #1239728.