— This option specifies the number of threads to use to copy multiple data files concurrently when creating a backup. The default value is 1 (i.e., no concurrent transfer).
This means if you have one large file this option won't be advantageous.
This feature request is to have the ability to copy one large file in chunks in parallel and then merge these chunks together at the restore time.
It appears that this issue is no longer being worked on, so we are closing it for housekeeping purposes. If you believe the issue still exists, please open a new ticket after confirming it's present in the latest release.
Currently PXB's option --parallel works on the file level.
For example, User Reference Manual at https://www.percona.com/doc/percona-xtrabackup/2.4/xtrabackup_bin/xbk_option_reference.html says:
— This option specifies the number of threads to use to copy multiple data files concurrently when creating a backup. The default value is 1 (i.e., no concurrent transfer).
This means if you have one large file this option won't be advantageous.
This feature request is to have the ability to copy one large file in chunks in parallel and then merge these chunks together at the restore time.
Incubator item
PXB option --parallel to work on chunks