OK, started cluster. I was providing wrong directories for p parameter. I got 3 groups, but first alpha is serving all predicates and second and third no predicates - why?
I have generated the data in the following way: I have source of data elsewhere. I have written a program which generates RDF file (72GB) with all my nodes and predicates, and schema file. I then used command:
dgraph bulk -r eth.rdf -s eth.schema --map_shards=6 --reduce_shards=3 --zero=localhost:5080
This produced 3 subdirectories in out directory: 0, 1 and 2. Am I correct guessing that 0, 1 and 2 each have different predicates? Then I have copied directory 0 to the first alpha, 1 - to second alpha, and 2 to third alpha. I used 0/p as p parameter for the first alpha and so on. Is it correct way of starting the cluster?