Comment 1 for bug 1183322

The reason is that with the fix for bug #1079700 XtraBackup does not reuse file descriptors for multiple tablespaces and keeps them open until the corresponding tablespaces are copied into the backup.

This is the only reliable way to fix bug #1079700 and similar ones. The downside is that the operating system limit on the number of open files for the user under which xtrabackup is running must be high enough to allow opening all tablespaces simultaneously.

We should document this for both 2.0 (when the fix for bug #1079700 is released in 2.0.8) and 2.1. Converting to a doc request.