**Comment from Launchpad by: Sergei Glushchenko on: 19-03-2015 18:44:23

For those who on XtraBcakup 2.1 please consider upgrading to 2.2.
2.2 has no such issue because it doesn't backup doublewrite file.
Doublewrite file is not really needed for xtrabackup because xtrabackup ensure that backup does not contain partially written pages by design. All pages are verified for consistency by checking their checksums.

**Comment from Launchpad by: Alexey Kopytov on: 10-06-2013 10:19:32

Correct, it's an incomplete fix for bug #1068470.

**Comment from Launchpad by: Raghavendra D Prabhu on: 30-05-2013 16:33:31

@Rocco, As per the original fix, the doublewrite buffer it copies is not required after prepare. You can delete that file after prepare/apply-log but before copy/move.

**Comment from Launchpad by: Raghavendra D Prabhu on: 30-05-2013 16:31:33

Assuming you have xtrabackup 2.1.3 installed on destination host as well, this is an issue caused by incomplete fix of lp:1068470

$excluded_files = $excluded_files . '|' . $doublewrite_file;

This doesn't handle full paths of doublewrite_file I think.

**Comment from Launchpad by: Rocco on: 29-05-2013 14:53:26

Well the path I wrote from my.cnf is on the source, and the destination
also for that matter.

On Wednesday, May 29, 2013, Raghavendra D Prabhu wrote:

> @Rocoo,
>
> What is the my.cnf on source host - just to check if
> backup-my.cnf is generated correctly. To see if it is bug in
> that.
>
> –
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1184888
>
> Title:
> innodb_doublewrite not copied back to proper location
>
> Status in Percona XtraBackup:
> New
> Status in Percona XtraDB Cluster - HA scalable solution for MySQL:
> New
>
> Bug description:
> innobackupex: back to original data directory '/data/mysql'
> innobackupex: Copying '/backup/2013-05-28/innodb_doublewrite' to
> '/data/mysql/innodb_doublewrite'
>
>
> /etc/mysql/my.cnf:
>
> innodb_doublewrite_file = /log/mysql-bin/innodb_doublewrite
>
> Ubuntu deb installed.
> ii percona-xtrabackup
> 2.1.3-608.precise
>
> Not sure if it's a problem or not (That the doublewrite file will be
> missing). InnoDB log files are copied to correct destination.
> innobackupex: back to original InnoDB log directory '/log/mysql-bin'
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/percona-xtrabackup/+bug/1184888/+subscriptions
>