NativeStore repo grows when same triples added

[jasonperry]

Hi, I am just starting to work with a NativeStore repository, and I noticed that when I add the same triple file repeatedly to an existing repo, the store keeps growing, both in disk usage and the number reported by connection.size(). Why is this happening? It shouldn't be adding multiple copies of the same triples, right? Is there a way to prevent this?

[hmottestad]

Does your file contain blank nodes?

[jasonperry]

That's it! I counted the number of statements with blank nodes, and that's exactly the amount by which the store size increases each time. So it's creating new identifiers for all the blank nodes every time.

I suppose that if I wanted to prevent this, but still make sure that blank nodes get unique names when I ingest different sources, I'd have to write some code to name blank nodes in a source-specific but deterministic way. Thank you.