Map/Reduce workflow for the initialisation of the photometric system (LS iterations, see Sect. 5.1). The workflow is composed of five Map/Reduce jobs labelled A to E. The red circles represent the global distributed join (J) or sorting and grouping by key (S&G) operations. The green boxes represent processes: the input(s) are represented by the incoming arrow, and the output by the outgoing arrow. The data cardinality is shown on the labels as 1 when a single record is handled at a time, or N when multiple records are handled simultaneously. See the text for further information on the distributed workflow.
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