Confusion of DataTier and EventContent

[vlimant]

as it seems, people have been creative in merging the two concept, while they have separate meanings.

• datatier is an ornament in dbs for the dataset name
• eventcontent is the actual list of collections that go in the output files

while people have been thinking that there's a one-to-one matching between the two. by legacy it is not. i.e. two different event content could make up datasets with the same data tier.

this crops up in https://cms-pdmv-prod.web.cern.ch/mcm/settings?prepid=datatier_input ,

cmsPdmV/mcm/json_layer/request.py

Line 3192 in 74b5157

task_dict['_output_tiers_'] = sequences[sequence_index]["eventcontent"]

and

cmsPdmV/mcm/json_layer/request.py

Line 3180 in 74b5157

tModule, tName = request.do_datatier_selection(__DT_prio[__curr_first_step], __prev_tiers)

where _output_tiers_ is actually _output_contents_.

We have to look at this closely to choose wether we:

• properly rename output_tiers and modify datatier_input content and description.
• leave output_tiers but fix it's assigned value, using

given #1187 the first option might be best as it also does not risk to break any current request. However, the second option gives more flexibility (the flexibility that was intended in the first place)

[vlimant]

@DickyChant