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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    Colm MacCárthaigh‏ @colmmacc 22 May 2019
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    "Error budgets" are the god-damn worst idea I've heard of in recent years. SLAs should be realistic goals about what we can achieve with our current techniques and tools, not permission to fail a certain amount.

    7:13 PM - 22 May 2019 from Seattle, WA
    • 25 Retweets
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    11 replies 25 retweets 121 likes
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      2. Colm MacCárthaigh‏ @colmmacc 22 May 2019
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        Related: planned downtime in 2019 is madness. Deliberate downtime to keep dependencies on their toes ... toxic. I'll make exceptions for chaos engineering *in the noise* where resilience processes can paper over a failed request or something, but not for turning off your service.

        7 replies 5 retweets 31 likes
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      3. Colm MacCárthaigh‏ @colmmacc 22 May 2019
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        9 times out of 10 I hear about error budgets it's a team who is focusing on their own convenience, because they haven't invested in convenient resilience, and isn't putting customers first. SLAs can be crude at this ... is a 4 hour outage ok on your busiest day? Still 99.95% YoY!

        2 replies 4 retweets 24 likes
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      4. End of conversation
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      2. Cindy Sridharan‏ @copyconstruct 22 May 2019
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        Replying to @colmmacc

        Does anyone really use an “error-budget” though - outside Google? I don’t know of anyone, tbh.

        6 replies 0 retweets 3 likes
      3. Colm MacCárthaigh‏ @colmmacc 22 May 2019
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        Replying to @copyconstruct

        SRE culture has tentacles, and seems to bring error budgets, seemingly endless Kubernetes tinkering, and stack over-complication to some places. Plenty of good too, mostly good on balance, but some of it gets to me.

        1 reply 1 retweet 16 likes
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      2. Simon Frankau‏ @simon_frankau 23 May 2019
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        Replying to @colmmacc

        What do you mean by SLAs? For me, they're the public-facing targets - like EC2 not breaking to AZs in a region at the same time. Such SLAs are really weak, and we set our SLOs a lot tighter. If you're talking about something else, what is the consequence of missing?

        1 reply 0 retweets 0 likes
      3. Colm MacCárthaigh‏ @colmmacc 23 May 2019
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        Replying to @simon_frankau

        At AWS pretty much everything has an internal SLA that is measured as the percentage of transactions. It varies from 99.95% to 99.999% depending on the service. We often measure it per-customer too. It's very similar to SLOs.

        1 reply 0 retweets 2 likes
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      1. kitchens‏ @this_hits_home 22 May 2019
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        Replying to @colmmacc

        I can see how they came to be given attempts to make IT more of a weapon than a cost center. In less bureaucratic places, error budgets may be used more so as expectation setting, but I’m not a fan. 1 incident can ruin a budget to where it’s like: ‘discounting that one time...’

        1 reply 1 retweet 3 likes
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      1. saoili‏ @saoili 22 May 2019
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        Replying to @colmmacc

        Interesting. What about the logic that those using your service will expect the availability you provide, not what you say you'll provide, and making a change that reduces availability, even if still well within SLO, appears a failure and causes them issues?

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      1. Candlepowerdiety‏ @cpdiety 23 May 2019
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        Replying to @colmmacc

        I'd generally agree with @mipsytipsy that nines don't matter if users are unhappy (or if they're happy for that matter). I think the key is choosing a metric that's a proxy for user happiness. If that can translate neatly into an error budget, yay. If not figure out what works

        1 reply 1 retweet 2 likes
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      1. Sandro Manke (闪山)‏ @2dbrain 23 May 2019
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        Replying to @colmmacc

        There is a way without having religious wars. Both are correct and both can and are abused. Google has a valid and great point that there will be errors and a certain amount of errors won’t hurt the business, but trading feature velocity for keeping sla often does.

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