The problem with neo4j is that Cassandra is a brilliant alternative with a superb hosted story - lots of providers have hosted Cassandra which scales to petabyt

The problem with neo4j is that Cassandra is a brilliant alternative with a superb hosted story - lots of providers have hosted Cassandra which scales to petabytes levels. And there is a huge scalable graph stack with Cassandra - Datastax Enterprise Graph, Titan,JanusGraph (where Google is involved), Tinkerpop,etc. The production readiness of neo4j is something I'm still not quite sure about. It truly shines as an embedded graph db though. I wonder if there is a Blockchain story around neo4j (as a replacement for leveldb) that makes this more interesting. After all there is a lot of excitement around DAG based blockchain alternatives.