We had a fun time this week with TokyoTyrant. Recently it has become apparent that MemcacheDB has been all but abandoned. As fantastic as the early work was by Steve Chu, the project is in disrepair. That, coupled with the less than obvious failover for its replication combined to make us seek alternatives.
This past April I was riding in a late model, 2 door rental car with an interesting trio for sure. On my right sat Patrick Galbraith, maintainer of DBD::mysql and author of the Federated storage engine. Directly in front of me manning the steering wheel (for those of you keen on spatial description, you may have noted at this point that its most likely I was seated in the back, left seat of a car which is designed to be driven on the right side of the road. EOUF [end of useless fact]), David Axmark, co-founder of MySQL. Immediately to his right sat Brian Aker, of (most recently) Drizzle fame.
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It semeed so simple, just setup two memcachedb instances and point them at eachother. Instant fault tolerance, Right? If only it were so simple!
Its not entirely clear from the documentation how to setup memcachedb for fault tolerance. Here’s the procedures I’ve found useful.
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So I was starting to play with Memcached for session storage, and I found a fairly big problem with justing memcached in its normal caching mode as a session store. It really just boils down to caching and storing of deterministic data being very different things that only look similar on the surface.
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I don’t remember exactly how I found memcachedb, however, it is one of those projects that somebody else beat me to the punch in writing. I mean, it was going to happen, as the need was there. Steve Chu, the author, did a great job of melding two open source projects, BerkeleyDB, and memcached, to produce something really very powerful
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