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Develop a graph database app using JanusGraph
https://github.com/ibm/janusgraph-utils

datamodel graphson groovy ibmcode janusgraph janusgraph-instance java schema

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Develop a graph database app using JanusGraph

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# Develop a graph database app using JanusGraph



This Code Pattern contains sample data and code for running a Twitter-like application in JanusGraph. The utility code illustrates how to use OLTP APIs to define schema, ingest data, and query graph. Developers can use or modify the code to build and operate their custom graph applications, or create similar java and groovy files to interact with JanusGraph.



When the reader has completed this Code Pattern, they will understand how to:

* Generate a synthetic graph dataset

* Load a graph schema from json

* Import graph data in csv files into JanusGraph database

* Query and update graph data using Console and REST API

* Setup and configure a distributed JanusGraph system



![](doc/source/images/architecture.png)



## Flow

Prerequisites:

Install and configure JanusGraph, Cassandra, ElasticSearch, janusgraph-utils



1. The user generates Twitter sample schema and data using JanusGraph utilities

2. The user loads schema and imports data in backend servers using JanusGraph utilities

3. The user makes search and update requests in a REST/custom client

4. The client app sends the REST requests to JanusGraph server

5. The JanusGraph server interacts with backend to process and return graph data



## Included components



* [Apache Cassandra](https://cassandra.apache.org/): An open source, scalable, high availability database.

* [JanusGraph](http://janusgraph.org/): A highly scalable graph database optimized for storing and querying large graphs. JanusGraph v0.1.1 was used for this code pattern development and test.



## Featured technologies

* [Databases](https://en.wikipedia.org/wiki/IBM_Information_Management_System#.22Full_Function.22_databases): Repository for storing and managing collections of data.

* [Java](https://java.com/en/): A secure, object-oriented programming language for creating applications.



# Watch the Video



[![](https://img.youtube.com/vi/1TQcPWgPvF8/0.jpg)](https://www.youtube.com/watch?v=1TQcPWgPvF8)



# Steps

## Run locally

1. [Install prerequisites](#1-install-prerequisites)

2. [Clone the repo](#2-clone-the-repo)

3. [Generate the graph sample](#3-generate-the-graph-sample)

4. [Load schema and import data](#4-load-schema-and-import-data)

5. [Run interactive remote queries](#5-run-interactive-remote-queries)



### 1. Install prerequisites

> NOTE: These prerequisites can be installed on one server. The instructions are written for Cassandra 3.10 and ElasticSearch 5.3.0 on Linux. Newer versions should work, but might not have been tested. The folder structures on Mac can be different. Check Cassandra and ElasticSearch official documentations for details.



Install Cassandra 3.10 on the storage server. Make the following changes in `/etc/cassandra/cassandra.yaml` and restart Cassandra.



```

start_rpc: true

rpc_address: 0.0.0.0

rpc_port: 9160

broadcast_rpc_address: x.x.x.x (your storage server ip)

```



Install ElasticSearch 5.3.0 on the index server. Make the following changes in `/etc/elasticsearch/elasticsearch.yml` and restart ElasticSearch.



```

network.host: x.x.x.x (your index server ip)

```



Install JanusGraph on the graph server:

* Install java (1.8), maven (3.3.9, newer should work), git (2.7.5, newer should work)

* Run `git clone https://github.com/JanusGraph/janusgraph.git`

* Run the following commands in the `janusgraph` folder:

```

git checkout 4609b6731a01116e96e554140b37ad589f0ae0ca

mvn clean install -DskipTests=true

cp conf/janusgraph-cassandra-es.properties conf/janusgraph-cql-es.properties

```

* Make the following changes in conf/janusgraph-cql-es.properties:

```

storage.backend=cql

storage.hostname=x.x.x.x (your storage server ip)

index.search.hostname=x.x.x.x (your index server ip)

```



Install a REST client, such as RESTClient add-on for Firefox, on the client machine.



### 2. Clone the repo



Clone the `janusgraph-utils` on the graph server and run `mvn package`.



```

git clone https://github.com/IBM/janusgraph-utils.git

cd janusgraph-utils/

mvn package

```



### 3. Generate the graph sample



Run the command in `janusgraph-utils` folder to generate data into `/tmp` folder.

```

./run.sh gencsv csv-conf/twitter-like-w-date.json /tmp

```

Modify the generated user file under `/tmp` so the sample queries will return with data.

```

sed -i -e '2s/.*/1,Indiana Jones/' /tmp/User.csv

```

### 4. Load schema and import data



A graph schema can be loaded from either the Gremlin console or a java utility. You can check the

doc [doc/users_guide.md](doc/users_guide.md) for details. Alternatively, just run one command in `janusgraph-utils` folder to

load schema and import data.

```

export JANUSGRAPH_HOME=~/janusgraph

./run.sh import ~/janusgraph/conf/janusgraph-cql-es.properties /tmp /tmp/schema.json /tmp/datamapper.json

```



### 5. Run interactive remote queries



Configure JanusGraph server by running these commands:



```

cd ~/janusgraph/conf/gremlin-server

cp ~/janusgraph-utils/samples/date-helper.groovy ../../scripts

cp ../janusgraph-cql-es.properties janusgraph-cql-es-server.properties

cp gremlin-server.yaml rest-gremlin-server.yaml

```



Add this line to janusgraph-cql-es-server.properties:

```

gremlin.graph=org.janusgraph.core.JanusGraphFactory

```



Change the following four lines in rest-gremlin-server.yaml:

```

host: x.x.x.x (your server ip)

channelizer: org.apache.tinkerpop.gremlin.server.channel.HttpChannelizer

graph: conf/gremlin-server/janusgraph-cql-es-server.properties}

scripts: [scripts/empty-sample.groovy,scripts/date-helper.groovy]}}

```



Start JanusGraph server:

```

cd ~/janusgraph; ./bin/gremlin-server.sh ./conf/gremlin-server/rest-gremlin-server.yaml

```



Now you can query and update graph data using REST. For example, send REST requests using RESTClient

in browser with following:

```

Method: POST

URL: http://x.x.x.x:8182

Body: {"gremlin":“query_to_run"}

```

You can find sample search and insert queries in [samples/twitter-like-queries.txt](samples/twitter-like-queries.txt).



# Sample output



![Sample output for "Find Indiana Jones' tweets that his followers retweeted"](doc/source/images/sample_output.png)



# Links

* [Demo on Youtube](https://www.youtube.com/watch?v=1TQcPWgPvF8): Watch the video.

* [JanusGraph](https://docs.janusgraph.org/): Learn more about this highly scalable graph database optimized for storing and querying large graphs distributed across a multi-machine cluster.

* [Data and Analytics Reference Architecture](https://www.ibm.com/cloud/garage/architectures/dataAnalyticsArchitecture): Learn how this Journey fits into the Data and Analytics Reference Architecture



# Learn more



* **Data Analytics Code Patterns**: Enjoyed this Code Pattern? Check out our other [Data Analytics Code Patterns](https://developer.ibm.com/technologies/data-science/)

* **AI and Data Code Pattern Playlist**: Bookmark our [playlist](https://www.youtube.com/playlist?list=PLzUbsvIyrNfknNewObx5N7uGZ5FKH0Fde) with all of our Code Pattern videos

* **JanusGraph Performance Evaluation:** [On-boarding with JanusGraph Performance](https://www.slideshare.net/ChinHuang4/onboarding-with-janusgraph-performance).



# License

This code pattern is licensed under the Apache Software License, Version 2.  Separate third party code objects invoked within this code pattern are licensed by their respective providers pursuant to their own separate licenses. Contributions are subject to the [Developer Certificate of Origin, Version 1.1 (DCO)](https://developercertificate.org/) and the [Apache Software License, Version 2](https://www.apache.org/licenses/LICENSE-2.0.txt).



[Apache Software License (ASL) FAQ](https://www.apache.org/foundation/license-faq.html#WhatDoesItMEAN)