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not4oundGraph

Simple Distributed Graph Database Management System written on Python as the project in Advanced Databases course at Innopolis University.

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

Clone repository on your local machine using:

git clone https://github.com/ilya16/graph-db.git

Python 3.6 interpreter is required and recommended to install and run the project.

Installing

To install Graph Database on you local machine

cd graph-db/
python setup.py install

...
Using /anaconda3/lib/python3.6/site-packages
Searching for plumbum==1.6.6
Best match: plumbum 1.6.6
Adding plumbum 1.6.6 to easy-install.pth file

Using /anaconda3/lib/python3.6/site-packages
Finished processing dependencies for not4oundGraph-DB==0.1

Note: We use rpyc package for building distributing file system and communication between peers. It must be installed from setup.py, but in case of any problems, please, manually run:

pip install rpyc

Running the tests

To run tests use:

python setup.py test

...
test_queries_invalid (src.tests.access.test_parser.ParserCase) ... ok
test_cache_clear (src.tests.engine.test_graph_engine.IOEngineCase) ... ok
test_deletions (src.tests.engine.test_graph_engine.IOEngineCase) ... ok
test_nodes_and_labels (src.tests.engine.test_graph_engine.IOEngineCase) ... ok
test_properties (src.tests.engine.test_graph_engine.IOEngineCase) ... ok
test_relationships (src.tests.engine.test_graph_engine.IOEngineCase) ... ok
test_simple_case (src.tests.engine.test_graph_engine.IOEngineCase) ... ok
test_simple_case_from_disk (src.tests.engine.test_graph_engine.IOEngineCase) ... ok

----------------------------------------------------------------------
Ran 9 tests in 0.064s

Test explanation

Tests affect various layers of the Graph Database:

  • Valid/Invalid queries
  • Create/Match/Update/Delete operations on nodes, relationships, labels, properteis
  • Reading existing graph from disk
  • Main memory cache
  • Distributed file system communication

Deployment

To deploy Graph Database simply use

n4Graph [conf_path]

where conf_path stands for the path to configuration file that describes peers of distributed file system including managers and workers (slaves).

Distributed File System

DFS configuration file has the following JSON format:

{
  "manager_config" : {
    "ip": "localhost",
    "port": 2131,
    "db_path": "db/",
    "workers": [
      {
        "ip": "localhost",
        "port": 8888,
        "stores": {
          "NodeStorage": true,
          "RelationshipStorage": true,
          "LabelStorage": true,
          "PropertyStorage": true,
          "DynamicStorage": true
        }
      }
    ],
    "dfs_mode": {
      "Replicate": true,
      "Distribute": false
    },
    "replica_factor": 2
  }
}

Without specifying any arguments, the default configuration file with replica_factor = 2 is used.

not4oundGraph supports two DFS modes:

  • Replication of data across multiple workers, each worker contains the same portion of data (example configuration file: config.json)
  • Distribution of data across multiple workers using Round-Robin algorithm (example configuration file: config_distributed.json)

Graph Engine API

We provide an API for managing graph database system directly from Python code. Supported graph operations are listed in specifications.

Data Access API (Query Language)

We provide own simple graph query language not4oundQL for executing queries and a wrapper around it. Language specification can found in not4oundGraph specifications.

Executable file n4Graph runs console mode and accepts not4oundQL queries:

Welcome to not4oundGraph DB. (c) Ilya Borovik, Artur Khayaliev, Boris Makaev

You can enter `/help` to see query examples.


/help

Query examples:
create graph: label
create node: label
create node: label key:value
create node: label key:value key:value key:value
create relationship: label from label1 to label2
create relationship: label from label1 to label2 key:value
create relationship: label from id:0 to id:1 key:value
...

Note: not4oundGraph DB does not support delete graph queries. If you want to delete graph, please, delete the db_path directory with data that you have specified in configuration file.

Built With

  • Python 3.6
  • rpyc (for distibuted file system)

Authors

License

This project is licensed under the MIT License - see the LICENSE.md file for details

Acknowledgments

  • Graph Database implementation is inspired by Neo4j Graph Platform
  • Distributed File System implementation is inspired by PyDFS