It is fixed in lp:~percona-dev/percona-xtrabackup/xtrabackup-parallel-compression. In that branch (which should eventually be merged into the next major XtraBackup release) the xtrabackup binary logs everything to stderr, no messages are ever logged to stdout.
It is fixed in lp:~percona-dev/percona-xtrabackup/xtrabackup-parallel-compression. In that branch (which should eventually be merged into the next major XtraBackup release) the xtrabackup binary logs everything to stderr, no messages are ever logged to stdout.