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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. Ben Laurie‏Verified account @BenLaurie 2 May 2019
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      Ben Laurie Retweeted Paweł Lasek

      Why do people think I'd rather have speed than security? Would you?https://twitter.com/pawel_lasek/status/1123610028047466496 …

      Ben Laurie added,

      Paweł Lasek @pawel_lasek
      Replying to @BenLaurie @jessfraz
      You can buy a machine where all of those layers are open and owner modifiable. But you won't get rid of them because a lot of it is ultimately necessary to run with speed and features you want, including features like "small"
      5 replies 0 retweets 5 likes
    2. Colm MacCárthaigh‏ @colmmacc 2 May 2019
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      Replying to @BenLaurie

      Colm MacCárthaigh Retweeted Colm MacCárthaigh

      leaving this here ...https://twitter.com/colmmacc/status/986286693572493312 …

      Colm MacCárthaigh added,

      Colm MacCárthaigh @colmmacc
      Security, durability, availability, speed. That’s the priority order I think about for design trade-offs and it’s never let me down. Simplicity and Cost are huge too but more like guiding principles. pic.twitter.com/KwRkUoqysB
      Show this thread
      2 replies 1 retweet 6 likes
    3. Daniel Vassallo‏ @dvassallo 2 May 2019
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      Replying to @colmmacc @BenLaurie

      I see availability and speed as the same thing. Availability is just a speed threshold chosen by the service provider. If an API is so slow that every client times out, then it’s unavailable. If an API fails but succeeds when retried 1ms later, then it’s probably available.

      2 replies 0 retweets 1 like
    4. Colm MacCárthaigh‏ @colmmacc 2 May 2019
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      Replying to @dvassallo @BenLaurie

      Well, that's a ridiculous take. Availability and speed are not the same thing.

      1 reply 0 retweets 3 likes
    5. adrian cockcroft‏ @adrianco 2 May 2019
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      Replying to @colmmacc @dvassallo @BenLaurie

      In this sense they are: A client cannot distinguish between a slow server and a down server.

      1 reply 0 retweets 0 likes
    6. Colm MacCárthaigh‏ @colmmacc 2 May 2019
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      Replying to @adrianco @dvassallo @BenLaurie

      Of course it can! only when the slowness goes beyond the threshold is that true. And a 100% error rate, but with super fast errors, is clearly not available.

      1 reply 0 retweets 1 like
    7. Daniel Vassallo‏ @dvassallo 2 May 2019
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      Replying to @colmmacc @adrianco @BenLaurie

      I think availability is best seen from the POV of delivering the promised utility to the user. If my Netflix movie streams without buffering, I don’t care if some packets had to be retransmitted. The service I wanted was available. But if it starts buffering, it’s not available.

      1 reply 0 retweets 0 likes
    8. Colm MacCárthaigh‏ @colmmacc 2 May 2019
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      Replying to @dvassallo @adrianco @BenLaurie

      That doesn't make availability == speed. Of course extreme slowness is downtime. So is durability failure. So are some security incidents. But these words have independent meanings. Systems can vary in speed and remain available, as you point out! That's why availability > speed.

      1 reply 0 retweets 2 likes
    9. Daniel Vassallo‏ @dvassallo 2 May 2019
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      Replying to @colmmacc @adrianco @BenLaurie

      Wouldn’t a good definition of availability be the ability to deliver something with certain performance & features? Saying availability > speed implies that one can be traded for the other. But availability is a function of speed, so they can’t be treated independently.

      1 reply 0 retweets 0 likes
      Colm MacCárthaigh‏ @colmmacc 2 May 2019
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      Replying to @dvassallo @adrianco @BenLaurie

      A classic example of a speed/availability trade-off is a cache. Introducing a cache often increases speed, but also creates a severe availability risk, in that the cache can be another point of failure, and that a cold cache can lead to an unrecoverable state.

      5:53 AM - 2 May 2019
      • 1 Like
      • tinyrobots
      1 reply 0 retweets 1 like
        1. New conversation
        2. Daniel Vassallo‏ @dvassallo 2 May 2019
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          Replying to @colmmacc @adrianco @BenLaurie

          From my speed==availability perspective, the cache would be an option to make the service "available" to use cases that cannot use it without the perf provided by the cache. So you're not trading avail/perf, but just making a strategic choice about availability options. ...

          1 reply 0 retweets 2 likes
        3. Daniel Vassallo‏ @dvassallo 2 May 2019
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          Replying to @dvassallo @colmmacc and

          If, say, S3 has a latency of 50ms, and I need 10ms for my project, S3 is not available to me. If S3 adds a cache and the latency drops to <10ms, then it becomes available to me. But the cache might add a risk of making it unavailable to everyone. It's all availability! 🙂

          1 reply 0 retweets 1 like
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