[anonetal]

I don't know about Neptune -- curious to hear what it is based on -- but TitanDB never really supported cross-machine traversals for the execution engine. The data was stored in a distributed fashion (across say a Cassandra cluster), but any instance of the execution engine was single-machine, with no easy way to talk between multiple instances of the execution engine.

[luisdbosquez]

One database service that supports horizontally scaled graphs is Azure CosmosDB Graph API: https://docs.microsoft.com/en-us/azure/cosmos-db/graph-intro...

Worth to take a look if you need a managed Gremlin solution with some degree of global distribution.