Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/915
@redoz A GLV is a Gremlin Language Variant (Gremlin.NET is an example of
one):
http://tinkerpop.apache.org/docs/current/tutorials/gremlin-language-variants/
A GLV is just a Gremlin language implementation and not a Gremlin Virtual
Machine (GVM) which would be the language execution engine (TinkerPop provides
the execution engine in Java). You might find these links interesting:
https://www.datastax.com/dev/blog/the-benefits-of-the-gremlin-graph-traversal-machine
https://arxiv.org/abs/1508.03843
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