xtrabackup won't run when slave_parallel_workers > 0 and --slave-info is used

Bug #1738383 reported by Rick Pizzi on 2017-12-15
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This bug affects 1 person
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Percona XtraBackup moved to https://jira.percona.com/projects/PXB
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Bug Description

In case of a multi threaded slave, xtrabackup refuses to run if --slave-info option is used.

However, as per this upstream bug http://bugs.mysql.com/bug.php?id=74528 it has been demonstrated that it is safe to trust exec_master_log_pos with MTS, if the slave SQL thread is stopped before taking the backup.

Following that, I expected --slave-info to be accepted if --safe-slave-backup is also used, but apparently, xtrabackup just refuses to run if the variable slave_parallel_workers has a value greater than zero and --slave-info is used, no matter the other options I use.

xtrabackup version 2.4.9 based on MySQL server 5.7.13 Linux (x86_64) (revision id: a467167cdd4)

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXB-1489

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