Hello,
It seems that we are missing a spec for what parameters are required and
what are optional and what is default, with regards to specifying
databases and tables in qserv.
I have some concept of what is required, e.g., you must specify overlap
for director tables (it should not default to 0 or some k), but it
occurs to me that perhaps others may disagree, and we have no reference
doc to point either for users or for us to argue over.
(I am also uncertain how to find docs for the parameters for the
partitioner, and what they default to, but that's different question.)
I think we need one. This will save us a fair amount of confusion in
implementation and will clarify the use of qserv-admin.py as well as
data-loader.py . I've created DM-1756 to track this work. Feel free to
pick it up as you wish. I will plan on putting in some version that I
derive from the bits of code that care (I don't think they are all
consistent... perhaps that is my fault).
Anyway, please let me know if you have any "yes, parameter X needs to be
required! people need to be explicit about that" or "don't you dare make
Y required! let's just default to Y=0" kinds of thoughts, and I'll be
sure to cover them.
I'm asking about "what is required/optional/default from the user",
which is slightly different than "what we should store in the metadata".
The former should be strict enough to prevent the user from making
mistakes and expressive enough to capture the intent, with a bit of "do
what I mean". The latter is really about capturing enough information so
that qserv is extremely sure of how it's supposed to operate.
Serge, I'm sure you've thought about what's optional and required for
partitioning, so if you can point me at your doc or the part of code
that enforces such things, that would help.
Thanks,
-Daniel
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