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You can implement the same features of this customised version using standard Redis sets. I've been using Redis to implement some large directed graphs (e.g. 300,000+ nodes, > 1m directed edges) using the built in Redis data structures pretty efficiently.

The author should explain the benefits of this approach.

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You are right. It's me who did that, and I explained the motivation here: http://qunsul.com/redis_part1.html

I don't want to downplay your work (which can be very helpful, I can see graphs being implemented natively), but why not use EVAL [0] and lua scripts for this ? I instinctively think that performance would be similar but:

- it would be more easily maintainable and extendable (lua scripts vs redis fork)

- it would still be usable in any language (because all you need is EVAL the scripts)

[0] http://redis.io/commands/eval

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