Comment 15 for bug 1098566

@Kolbe, @Serge,

> Why not put this new functionality into the regular "xtrabackup" SST script instead of into a new one?

The 'regular' script is just there for backward compatibility and, so,
all additions go to v2 only. The v2 script works differently and is not
compatible with old one. This is pretty clear in our
documentation and I don't know what is the ambiguity here on that.

> Why require this sst-special-dirs variable

This is because this relied on a PXB feature added in 2.1.6 which
was also newly released. I didn't want to bump minimum dependency version of PXB onto PXC since 2.1.6 was newly released, and it may have had bugs, so didn't want to restrict in case downgrade of PXB is required.

But, now that, it looks good, I will make it default: https://bugs.launchpad.net/percona-xtradb-cluster/+bug/1276904