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concurrency #86

jschoch opened this issue Oct 8, 2016 · 0 comments

concurrency #86

jschoch opened this issue Oct 8, 2016 · 0 comments


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@jschoch jschoch commented Oct 8, 2016

I'm doing a few experiments and keep running into ConcurrentModificatio
nException. What strikes me as odd is that access such as g.v(...).first causes problems.

I'm using tinkergraph, perhaps that is causing it's own problems that may be solved with a non-memory backend?

What' i'd like to do is parse a CSV file into a graph. Some items need to be looked up first. create_vertex seems to work fine with Thread or the Parallel gem. routes do not, and add_edges_to also seems problematic. I've experimented with bulk_job, but this seems very slow for a single vertex result.

basic example

(1..1000).each do |n| {
        new_node = g.create_vertex({thing: n})
        name = Random.rand(1000)

        #  Blows up
        #v = g.v(name: name).first

       # works
        v = g.vertex(name)
        if v == nil
          raise "bad! #{name}"
        v.add_edges_to(:unf, new_node)

in this test I can grab the vertex by the raw ID, in my project I have another key and do not use it for the vertex id. should I keep some index of the key mappings for the pacer id's to my id's to avoid creating a "route"? Why does reading a route create an exception? Is tinkergraph and the lack of transactions the problem?

any help appreciated.

@pangloss pangloss closed this Mar 24, 2018
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