[Tile-serving] [osm2pgsql-dev/osm2pgsql] parallelize the COPY phase (Discussion #2426)

[Jochen Topf]

@tvondra When COPYing into the same table from multiple threads, do you see a possible issue with data ordering? What I mean is that in one case (the middle tables in slim mode), those tables will be written in the order of their primary key id. I assume this to be a good thing, at least building the index will be faster I would assume. If we write from multile threads, the table will not be as ordered. Do you forsee any issues there? (I would expect this to be a large issue, with changes afterwards the table will get unsorted anyway, but I'd just though I check.)

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