JanusGraph

JanusGraph - Distributed, open source, massively scalable graph database.

JanusGraph

JanusGraph - Distributed, open source, massively scalable graph database.

9/10/2024

Sack with List (Split and Merge operations)

Hi all, I am trying to get the following usage of sack working (with JanusGraph) and would appreciate a pointer in the right direction. I have broken the query down to the following, because I want to get the sack working at first. g.withSack([] as Set){set-> set.clone()}{setA,setB -> setA.appendAll(setB); setA}. V() .has('name', 'TS')...

mrat85

8/30/2024

Edge Index stuck at Installed

I have a Janusgraph instance running 1.0.0 with scylladb storage and Elastic indexing. I am trying to follow the example for creating an index on one of my edges: ``` graph.tx().rollback() //Never create new indexes while a transaction is active mgmt = graph.openManagement() time = mgmt.getPropertyKey('time')...

b4lls4ck

8/23/2024

Speeding up Queries Made to JanusGraph

Hi, I am working with Janusgraph and my query is taking a while to execute (around 2.8 seconds), but I would like it to be faster. I read that I should create a composite index to improve speed and performance or something of that sort, but I am unfamiliar with how to do that in Python. Here is my query: g.V().has("person", "name", "Bob").outE("knows").has("weight", P.gte(0.5)).inV().values("name").toList() What my query does is it finds all the nodes that Bob has relationship "knows" with, as long as the weight of the edge to those nodes are >=0.5. Bob has around ~600 nodes that it's connected to with the "knows" relationship. It's fairly slow and takes 2.5-2.8 secs to complete....

Opan

8/21/2024

Implement new storage backend using Tablestore

Hello, thank you for allowing me to join. This is my first post so apologize if I post my question in the wrong channel. So, I am planning to setup a new storage backend using Tablestore from AlibabaCloud https://www.alibabacloud.com/help/en/tablestore/tablestore-hbase-client, is there a doc on how to get started to integrate a new storage backend in Janusgraph? Thanks in advance...

karthikraju

8/16/2024

Is there a way to connect janusgraph to an existing opensearch instance as the index backend?

I have an opensearch instance running already which I want to also use as the index backend for janusgraph.

      janusgraph.index.search.backend: elasticsearch
      janusgraph.index.search.hostname: <my-opensearch-hostname>:9200

      janusgraph.index.search.backend: elasticsearch
      janusgraph.index.search.hostname: <my-opensearch-hostname>:9200

...

HailDevil

8/13/2024

Janusgraph Servers start throwing Exceptions when load increases

We have 10 instances of Janusgraph servers with 1 CPU each and 10GB of memory limit. It works fine when the number of requests are not much, but when we increase the request load, every instance of server starts throwing "Connection reset by peer" error. Previously we were facing idle connection closing issue, for which we added below configuration in our servers to resolve: evaluationTimeout: 0 idleConnectionTimeout: 0...

gdotv

8/9/2024

Granular configuration options for such as JANUSGRAPH_RELATION_DELIMITER on driver

Hi folks, I'm curious about the possibility to make configuration options such as JANUSGRAPH_RELATION_DELIMITER more granular at the driver level. I know it can currently be set as an environment variable, but I'm wondering if there's thoughts of making this configurable on a per DriverRemoteConnection/Cluster basis client-side. The reason I'm asking is to cater for potential use cases where users on G.V() might need to connect to multiple janusgraph databases with disparate setups. Is that something reasonable/achievable as a potential new feature?...

Solution:

It’s unfortunately not viable, because driver package has no dependencies on config (core) package

8/9/2024

Schema creation with groovy script does not work on inmemory setup

Hello, all. We are facing an issue while trying to create a schema by executing a groovy script with an inmemory setup. Below are the steps to reproduce: Create container via docker compose -f docker-compose.yml up -d (see attachments). Use the schema.groovy (see attachments) file to instantiate graph. In order to do this, we must:...

docker-compose.yml

karthikraju

8/8/2024

What would be the ideal way to set up deep learning on janusgraph data?

I have setup a simple knowledge graph on janusgraph and I wanted to use the data to train a deep learning model. I found DGL(https://dglke.dgl.ai/doc/index.html) library which seems to be used mostly. I am not sure how I should go about this. DGL accepts training data as a simple comma seperated strings which defines the from_vertex, relationship and the to_vertex ex: "London", "isCapitalOf", "UK" ...

NeO

8/1/2024

How does remote gremlin server reacts to credential rotation.

I have are remote gremlin server setup with backend database as Cassandra. I need to rotate Cassandra Username/password once a week. My Cassandra credential are stored in gremlin server properties file and are injected by side-car container at boot time. How does the Janus graph reacts to if Cassandra credential are changed ? How can I achieved a rotation of Cassandra credentials without any downtime for gremlin server? ...

7/29/2024

Infinite recursion error when evaluating script on Inmemory setup

Hello all, in our usecase, we use a Cassandra backend for development and production, but use an inmemory setup for running integration tests. We run our tests from a python application, using Gremlin Python and JanusGraph Python. The issue we face when running the inmemory setup is that the following error is thrown when trying to submit a script to JanusGraph: org.apache.tinkerpop.shaded.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError) Some background configuration on how we run our setup can be found below (setup.yml). The python script and groovy code we are submitting to JanusGraph (script.py)....

setup.yml

7/24/2024

Incremental schema changes - Indices get stuck in 'Installed' state

Hi All, in our use-case the graph schema is changing over time and we have issues to incrementally add indices to the schema as we get error in the below scenario: 1. We create a graph with an initial schema and fill it with data. 2. We try adding a new index and cycling through the recommended steps in the documentation document here: https://docs.janusgraph.org/schema/index-management/index-lifecycle/ (Installed -> Registered -> Enabled (through Reindex action). ...

compositeIndex.groov...

b4lls4ck

7/18/2024

Is there a suitable JanusGraph visualizer where you can see your created graphs?

I am using Python (gremlin-python) to create JanusGraph graphs, and am using Docker to host the JanusGraph on my machine. Is there any software or plugin available that can display my created graphs?

criminosis

7/10/2024

MergeV "get or create" performance asymmetry

So I'm working on adding the mergeV step among others to the Rust gremlin driver. As part of that I took a pause and did a performance comparison to the "traditional" way of doing it. So the Rust driver is submitting bytecode that's effectively doing: "Traditional/Reference":...

pm_osc

6/26/2024

Incremental schema changes - Property Key constraint does not exist

Hi All, in our use-case the graph schema is changing over time and we have issues to incrementally add properties to the schema as we get error in the below scenario: 1. day 1: we create a graph with an initial schema: person node with firstName property. 2. day 2: we try adding lastName property to the person node. This still works and one can create persons with lastName 3. day 3: we try adding fullName property to the person node. This does not work any more as gp_traversal.addV('person').property('fullName', 'test full name') throws error: Property Key constraint does not exist for given Vertex Label [person] and property key [fullName]. ...

Solution:

Hello, you need to close graph in order to take into account new schema constraint, no need to restart server. You can close graph with ConfiguredGraphFactory.close, then it will automatically open again with GremlinExecutorGraphBinder in JanusGraphManager....

day1.groovy

paull8147

6/25/2024

Text predicate not serializable (containsPhrase, notContainsX, etc)

Hello, JanusGraphPSerializer is missing several predicates, this is causing a timeout exhausting all opened connexion when we're calling these predicates. I fixed this locally, I can do a merge request, but i haven't found the related issue. Here are the 8 missing predicates :...

Aiman

6/24/2024

How do we generate transaction logs ?

This is how I created Client ``` def loadClient(graphId: String): Client = { val typeSerializerRegistry = TypeSerializerRegistry.build.addRegistry(JanusGraphIoRegistry.instance).create val cluster = Cluster.build()...

thelearningpanda

6/17/2024

RpcRetryingCallerImp while trying to connect JanusGraph with Hbase 2.2.7 under Cloudera Distribution

Hi, I am new to using JanusGraph and I am trying to integrate JanusGraph version 0.6.4 with Kerberized HBase 2.2.7, which comes under the Cloudera Distribution 7.9.1. I had to use an earlier version of JanusGraph since the compatibility matrix specifies that JanusGraph is tested compatible with HBase 2.2.x. I am using the following configuration to get a 3-node HBase cluster to interact with JanusGraph. However, when I try to start the server, I encounter the following loop, and as a result, the server does not start. ...

cdegroc

6/11/2024

Potentially useless allocations when checking a field cardinality

👋🏻 Hey folks In a service running JanusGraph embedded, I observed a number of sizeable allocations coming from JanusGraphVertexFeatures#getCardinality (https://github.com/JanusGraph/janusgraph/blob/2c71b378339a3ab49b961eef29b5a042d018f513/janusgraph-core/src/main/java/org/janusgraph/graphdb/tinkerpop/JanusGraphFeatures.java#L161-L169). From a profile (attached), it looks like...

HailDevil

5/29/2024

Java 17 support

When can we expect Janusgraph to support Java 17? 🙂

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JanusGraph

JanusGraph - Distributed, open source, massively scalable graph database.

JanusGraph

JanusGraph - Distributed, open source, massively scalable graph database.