Comment 1 for bug 713267

Peter,

I'm not quite clear about both the bug and the proposed solution.

So xtrabackup crashed because the OS did not allow it to proceed due to open files limit. Note that during backup xtrabackup does not use more that (2 * N + 1) descriptors where N is the number of --parallel threads. The remaining descriptors could be used by the server or some other activity in the system.

I don't see how that can be fixed by handling server settings. It's about the OS limit, rather than any server/InnoDB limit. It's also not clear how cases like that can be detected in advance so xtrabackup would refuse to run.