High Availability

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4 modifications for Raft consensus

A month ago I published a quasi-academic paper, proposing 3 modifications to the Raft replication algorithm. I got some great review and feedback on the Raft mailing list. So based on that I have now updated the paper, hopefully to be much clearer than the first iteration.

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3 modifications to the Raft consensus algorithm (paper)

Update: This version of my paper is superceded by a new version: 4 modifications to Raft consensus. Please read it instead.

August is usually a slower month as a lot of people are on vacations. I try to take advantage of that to work on tasks that require a bit more deliberation and quiet time. This Summer I returned to re-reading the paper on the Raft algorithm, in particular my colleagues in New York pointed out that the PhD thesis that extends on the original paper was now complete, and contains some additional details.

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Slides and spreadsheets for my MySQL High Availability tutorial

Good morning Percona Live visitors! Attached to this post you can find a spreadsheet (both LibreOffice or Excel, as you prefer) that you can use towards the end of my tutorial. I've also attached the slides so you can download a copy of them.

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Slides for Evaluating MySQL HA Alternatives

Attached are the slides for my MySQL Connect talk Evaluating MySQL High-availability alternatives, which I will present today at 14:30 at the MySQL Connect conference.

A bit unusually I'm posting the material ahead of the talk. The point of the talk is about evaluating each alternative from your own perspective. With that in mind, if you're at the talk with your own laptop, feel free to browse the slides at your own pace from here.

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Failover is evil

In the Matrix movie there is a scene where the heroes visit a spiritual councelor, and amongst the people in her waiting room they see a little boy, dressed like a buddhist monk, who can bend a spoon just by looking at it. When they ask him what he does to bend the spoon, the boy's answer is: "There is no spoon". And if you watch the movie to the end, you will see that he is right. (In that spirit, if this post is too long to read for you, just skip to the last paragraph for the answer.)

The title for this blog post is of course inspired by Baron's "Is automated failover the root of all evil?", which is a commentary on GitHub's detailed explanation of their recent Pacemaker-induced downtime. Baron makes a good question, but the answer is deeper than suggested by the question. The problem is not the automation, the problem is the failover.

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Helsinki MySQL User Group on May 29

The Helsinki MySQL User Group will meet at the usual place on May 29th. Click here for details and to RSVP. Linas Varbalas will talk about Tungsten and maybe dare a live demo!

Linas is in town for the OUGF Harmony conference 2012. The conference might of course be of some interest to user group members too. Due to the conference we also have other famous MySQLrs in town, Sheeri Kabral of OurSQLcast fame has also confirmed she will attend the user group (and maybe have OurSQLcast CD's with her?)

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MySQL conference HA tutorial resources

Attached are slides and a excercise spreadsheet for the How to evaluate which MySQL High Availability solution best suits you tutorial.

We will use the spreadsheet after the break, please download it now.

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Slides for Choosing a MySQL High Availability solution

Here are the slides to my first talk at Percona Live UK 2011: Choosing a MySQL High Availability solution.1

  1. 1. See this for a review of the conference as a whole: http://openlife.cc/blogs/2011/october/thanks-percona-and-attendees-great-percona-live-uk-2011
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