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README.txt

PyGREN -- Python Graph Engine
=============================
Approved for Public Release; Distribution Unlimited. 13-3052
Copyright ©2014 - The MITRE Corporation. All rights reserved.

The authors' affiliation with The MITRE Corporation is provided for identification
purposes only, and is not intended to convey or imply MITRE's concurrence with, or 
support for, the positions, opinions or viewpoints expressed by the authors.

PyGREN is a distributed graph database engine. It's based on top of Tornado and
SQLAlchemy and implements a Bulk Synchronous Parallel system.
http://en.wikipedia.org/wiki/Bulk_Synchronous_Parallel

Currently, it supports:
 - distributed SQL queries
 - Simple subject/predicate/object queries
 - Dynamic updates and addition of data
 - Processing jobs
 - SPARQL queries (work in progress)

Requirements
------------
 - (Python 2.7?)
 - Unix like operating system
 - SQLAlchemy
 - lockfile
 - python-daemon
 - tornado

Installation
------------
 - Installable via pip:

    pip install pygren

 TODO: Install on slaves using pybundles (possibly a script to do this


Using PyGREN
------------
### Starting ###

To start pygren, type

    pygren debug

at the command line. Use CTRL-C to stop it.

### Usage ###

PyGEN is accessible through a human readable HTTP interface as well as a
machine-friendly RESTful interface. When PyGREN starts up, it will present the
graphical user interface at 127.0.0.1:8080.

#### End Points ####
 - /api/
 - /db/
 - /graph/
 - /query/

### Importing Data ###
There are several ways to import data with pygren. The simplest is through the command line:

    pygren import <filename>

Terminology
----------
 - PyGREN stores triples in a graph
 - A query is a request of data in the graph
 - Bulk Synchronous Parallel requests

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A distributed graph database engine.

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