[Clas12_calcom] Micromegas DAQ constants update

[Francois-Xavier Girod]

Dear Guillaume

I am not currently doing any mass decoding. I see a couple people doing
simulations on the batch farm, although I doubt they could be affected.

Best regards
FX

On Fri, Feb 16, 2018 at 3:35 PM, Guillaume CHRISTIAENS <guillaum at jlab.org>
wrote:

> Hi all,
>
> In order to reduce Micromegas data size, we now use "sparse samples" in
> MVT. To compute a time information correctly we need this information to be
> accessible during the decoding.
>
> Since it's an electronic feature that we didn't know before facing this
> data size issue, ccdb table was not made to hold this information. Then I
> would like to add 2 constants and thus 2 columns to the current DAQ table
> for micromegas (/daq/config/bmt). It's only a 1-row table so not too heavy.
>
> I think the only ways to add columns are to delete the table and create a
> new one, or to create a duplicate table with a different name (like
> /daq/config/bmt2). Even if it's not the spirit of ccdb, I clearly prefer
> the first solution, to keep clean and clear tables, and since it's just
> adding column, retro-compatibility will be fine.
>
> The only issue I see is if someone is decoding a file at the moment the
> table is deleted and then created again, he may have errors.
>
> What do you think ?
>
> Regards,
>
> Guillaume
>
>
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