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Hi

Can we adopt a new rule: a qserv installation should
never rely on directories outside of qserv install
directory. I am talking about not relying on directories
such as /dev, /tmp, /var, /log, etc... I know there
was a lot of effort to move things off /tmp, /var,
/log, but I noticed we still rely at least on /dev,
e.g., our two "production" installations on lsst-db2
are both sharing:

scratch_path = /dev/shm/qserv

This is not always easy to spot, I happened to
notice because /dev/shm/qserv is owned by Douglas
and I can't write to it, so my qserv fails.

I wonder if any bad things might happen if two
installations share scratch_path... Douglas,
you might want to fix that.

Jacek

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