Phillip Pearson - web + electronics notes

tech notes and web hackery from a new zealander who was vaguely useful on the web back in 2002 (see: python community server, the blogging ecosystem, the new zealand coffee review, the internet topic exchange).


ZooKeeper: pretty much exactly what I was looking for

After writing about wanting a replicated versioned database for storing host configuration information the other day, I found out about ZooKeeper, from Yahoo! Research. I'm fairly sure that it's what I was looking for. I've been playing with it today and all looks good so far.

Here's a blog post about it with some more details. Basically it's a distributed versioned object store with a few tricks (the ability to set 'ephemeral' nodes, which disappear when you disconnect, and nodes with serial numbers) that let you implement locks, barriers and queues.

The Java process that's been running it all afternoon has used 7 s of CPU time so far and is showing an RSZ of 16704 kB, so it looks like it scales down well - that's comparable to a Python or Ruby process.

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