Steve Kemp's Blog Writings relating to Debian & Free Software

I understand volunterering is hard

Saturday, 5 October 2013

The tail end of this week was mostly spoiled by the discovery that libbeanstalkclient-ruby was not included in Wheezy.

Apparently it was removed because the maintainer had no time, and there were no reverse dependencies - #650308.

Debian maintainers really need to appreciate that no official dependencies doesn't mean a package is unused.

Last year I needed to redesign our companies monitoring software, because we ran out of options that scaled well. I came up with the (obvious) solution:

  • Have a central queue containing jobs to process.
    • e.g. Run a ping-test on host1.example.com
    • e.g. Run an SSH-probe on host99.example.com
    • e.g. Fetch a web-page from https://example3.net/ and test it has some text or a given HTTP status code.
    • (About 15 different test-types are available).
  • Have N workers each pull one job from the queue, execute it, and send the results somewhere.

I chose beanstalkd for my central queue precisely because it was packaged for Debian, had a client library I could use, and seemed to be a good fit. It was a good fit, a year on and we're still running around 5000 tests every minute with 10 workers.

The monitoring tool is called Custodian Custodian, and I think I've mentioned it before here and on the company blog.

It looks like we'll need to re-package the Ruby beanstalk client, and distribute it alongside our project now. That's not ideal, but also not a huge amount of work.

In summary? Debian you're awesome. But libraries shouldn't be removed unless it can't be helped, because you have more users than you know.

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