Thanks for recommending this approach. However, I am getting following error:
when running gremlin> def list = client.submit("g.V()").all().get()

Adding new types of storage or indexing backends to JanusGraph is not straightforward. So, unless you are a seasoned java developer and have some time to spare, you will have to use the available storage and indexing backends, as listed in https://docs.janusgraph.org/.

I am not aware of any out-of-the-box/cloud solutions to transfer data from Mongodb to JanusGraph.

Best wishes,    Marc

Hi everyone, is it possible to use mongodb or elastic search as the storage backend? I'm new to janusgraph so please bear with me and feel free to explain anything obvious that I may be missing. It appears Mongodb and janusgraph are entirely different types of databases but I’m just wondering if there’s a known way to make janusgraph work with data that’s already stored in mongodb. Elastic search is a common indexing backend for janusgraph, and is commonly used with mongodb as well. So I’m considering if it’s possible to use all 3 together. If mongodb can't be used, how about elastic search as the storage backend as well as the indexing backend?

Connecting gremlin console to gremlin server goes like:

cluster = Cluster.build(<hostname>).jaasEntry(<entry in gremlin-jaas.conf file>).protocol(<serverPrincipalName>).create()

and see https://tinkerpop.apache.org/docs/current/reference/#connecting-via-drivers how to use the cluster object.

Did you try this already?

" Krb5Authenticator runs inside Gremlin Server and authenticates users of gremlin clients (e.g. Gremlin Console). " this is configured as part of gremlin-server.yaml. 
When I run just "graph" alone  from gremlin-console, I get error "Authenticator is not ready to handle requests".
Whereas when I run JanusGraphFactory it passes. Not sure why do we get this. My current service keytab had 2 principals and I configured one. Will it create problem?

Hi Nikita,

I do not understand: Krb5Authenticator runs inside Gremlin Server and authenticates users of gremlin clients (e.g. Gremlin Console). Why would you run JanusGraphFactory in the Gremlin Console if the graph is already opened server side?

Can you also check the logs of Gremlin Server and see if they give any additinal hint about Krb5Authenticator?

Best wishes,   Marc

Hi Aman,

Without saying that I understand everything of the JanusGraph behaviour that you describe, I can add the following:

• when accessing the graph via JanusGraph server (what you call the gremlin API) every request is a transaction already (unless you use sessions). So, using buildTransaction for defining g in JanusGraph Server is counterintuitive and possibly enters untested territory.
• Apache TinkerPop has the so-called ReadOnlyStrategy to realize the behaviour you want. Can you try that instead?

Best wishes,    Marc

Hi Wasantha,

It's great to hear that you have solved the previous problem.

Regarding contributing to the community, I would suggest you create a GitHub issue first, describing the problem and your approach there. This is not required but recommended. Then, you could create a pull request linking to that issue (note that you would also be asked to sign an individual CLA or corporate CLA once you create your first pull request in JanusGraph).

I am not 100% sure if I understand your question, but I guess you are asking what exactly is stored in that cache. Basically, that cache stores the raw data fetched from the storage backend. It does not have to be vertex - it could be vertex properties or edges. It might also contain deserialized data (See getCache() method in Entry.java). Note that in your case, since your cache is not local, it might be a better idea to store only the raw data but not the deserialized data to reduce the network overhead. To achieve that, you could override Entry::setCache method and let it do nothing. If you are interested in learning more about the "raw data", I wrote a blog Data layout in JanusGraph that you might be interested in.

Hope this helps.
Boxuan

Hi Boxuan,

We were able to overcome sync issue on multiple JG instance after doing modifications on void invalidate(StaticBuffer key, List<CachableStaticBuffer> entries) as suggested. We had few performance issues to resolve which took considerable effort.

i am happy to contribute the implementation to community since it's almost done. Please guide on that. 

One another question on cache :

private final Cache<KeySliceQuery,EntryList> cache;

As per above initialization on cache object it persists only the specific query against result of that query. It does not caches all the traversal vertices. Is my understanding correct ?

Thanks
Wasantha

Hi Krishna,

storage.hostname = cass01,cass01

Hi,

Hi Team,

We are running JanusGraph + Cassandra combination for storing through Gremlin Commands from Java Api.
Thinking of saving the full JSON document into Graph alongside relationship.

Gremlin Query is Like Below :

g.addV('Segment').property(\"docId\",docId).property(\"docValue\",docValue).property(\"docSize\",docSize)

The "docValue" value will be huge lying in the range of 100-500kb. It is a JSON document.
Wanted to understand whether it is a good practice to save full documents in Graph or should we only store the references.

Hi hadoopmarc

It's a typo in the post, I had just typed that people can understand I am passing it as a string.
in acutal code, i am using property file and reading those properties in configuration2 object and passing to janusgraph.

Thanks
Krishna Jalla

Hi Krishna,

The properties you cite are not quoted in the right way:

"storage.hostname: "cass01,cass02,cass03""

Are these typos in the post or in your actual code?

Best wishes,   Marc

HI Boxuan,

I am using the same above mentioned config in the properties file, loading configuration2 object using java and loading janusgraph.

Thanks
Krishna Jalla