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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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    1. Jacob‏ @jhscott 22 May 2019
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      Replying to @colmmacc @copyconstruct

      I think that "strong contracts empower distributed ownership". Thus, an explicit error budget -- with e.g. common visibility of current value -- empowers teams to make the right decisions and have clear expectations what happens when you miss your SLA.

      2 replies 0 retweets 2 likes
    2. Colm MacCárthaigh‏ @colmmacc 22 May 2019
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      Replying to @jhscott @copyconstruct

      Measuring SLAs and how you're doing, down to each customer's experience, and having transparency about that ... that's all good. But that's just using an SLA IMO. Error budgets are an extra concept layered on top, and my point is I don't think it's a good one.

      4 replies 0 retweets 1 like
    3. Colm MacCárthaigh‏ @colmmacc 22 May 2019
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      Replying to @colmmacc @jhscott @copyconstruct

      Even the name implies that there's a budget for errors. It's a bad framing. Leads to behaviors like being less cautious when the budget is less spent. Or worst ... that you can plan to spend it pro-actively to help cut some corners.

      1 reply 0 retweets 1 like
    4. Jacob‏ @jhscott 22 May 2019
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      Replying to @colmmacc @copyconstruct

      ah but I think that's one of the best parts! Like there is always a balance between velocity and reliability, right? So setting an *appropriate* SLA and error budget makes it clear to e.g. product managers that you are moving slowly b/c you need five nines.

      1 reply 0 retweets 0 likes
    5. Jacob‏ @jhscott 22 May 2019
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      Replying to @jhscott @colmmacc @copyconstruct

      vs moving faster if you can get away with three nines. If your business use case can't take the corner cutting, tighten your SLA!

      1 reply 0 retweets 0 likes
    6. Colm MacCárthaigh‏ @colmmacc 22 May 2019
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      Replying to @jhscott @copyconstruct

      *shudder*. That is the exact unhealthy organizational dysfunction I'm talking about! First - we don't need to trade-off velocity and reliability. Investments in test and deployment automation, and in compartmentalization, usually deliver both. Second ...

      1 reply 0 retweets 4 likes
    7. Colm MacCárthaigh‏ @colmmacc 22 May 2019
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      Replying to @colmmacc @jhscott @copyconstruct

      if you're in a PHB product managers are in charge but not listening situation ... fix that :) Best model is comprehensive team ownership of business, development, and operations, with mutual understanding.

      2 replies 0 retweets 2 likes
    8. Jacob‏ @jhscott 22 May 2019
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      Replying to @colmmacc @copyconstruct

      I don't disagree and/or I "want to believe", but the same way @copyconstruct alludes to error budgets being rarely deployed in practice, I believe that especially for hypergrowth companies, "investments in test and deployment automation" don't yield...

      1 reply 0 retweets 0 likes
    9. Jacob‏ @jhscott 22 May 2019
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      Replying to @jhscott @colmmacc @copyconstruct

      enough of "both" to offset rapid growth in engineering headcount, features, service<>service interactions, etc. See e.g.https://medium.com/@mattklein123/the-human-scalability-of-devops-e36c37d3db6a …

      1 reply 1 retweet 0 likes
    10. Colm MacCárthaigh‏ @colmmacc 22 May 2019
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      Replying to @jhscott @copyconstruct

      We're getting so much better as an industry! I remember going through a 3 day global outage at Skype, 13 years ago now. Can't imagine the same today if we're building on modern tooling, cloud, etc. Probably a 10x improvement in that time.

      1 reply 0 retweets 1 like
      Colm MacCárthaigh‏ @colmmacc 22 May 2019
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      Replying to @colmmacc @jhscott @copyconstruct

      I have hope that serverless can deliver a similar improvement, over a similar time-frame. Hopefully in 2030, 4-5 nines is very low effort even for a boutique one or two person team full of naivety.

      8:26 PM - 22 May 2019 from Seattle, WA
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Jacob‏ @jhscott 22 May 2019
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          Replying to @colmmacc @copyconstruct

          ah, sigh, I'm kind of a serverless skeptic. I want to believe! But not clear how it adds nines (point me to resources if you have them!). For your potential two hour outages, maybe ask *why* developers want them and why the automated tooling hasn't de-risked their changes?

          1 reply 0 retweets 0 likes
        3. Jacob‏ @jhscott 22 May 2019
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          Replying to @jhscott @colmmacc @copyconstruct

          I suspect (core?) AWS and its customers operate with pretty different levels of maturity, chaos, resourcing, ...

          0 replies 0 retweets 0 likes
        4. End of conversation

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