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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. Dan Luu‏ @danluu May 15
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      Where does engineering rep come from? Here's a Google engineer slagging on Amazon engineering, which they say mediocre. I don't think this is an unusual opinion, I've heard this from people both inside and outside of Google. Google has the best engineering, Amazon is mediocre.pic.twitter.com/EPLwjpUytT

      "Amazon clearly does not compete by hiring the best engineers. Rather, they compete by throwing money at the problem and undercutting everyone else, getting by with mediocre engineering." -- googlemike
      49 replies 117 retweets 640 likes
      Show this thread
    2. Colm MacCárthaigh‏ @colmmacc May 15
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      Replying to @danluu

      I'm probably going to regret tweeting this, but I think we're 100% fine with Google folks thinking this, but they would never be comfortable the other way around. And that's the difference.

      5 replies 5 retweets 227 likes
    3. Colm MacCárthaigh‏ @colmmacc May 15
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      Replying to @colmmacc @danluu

      I'm also going to regret tweeting this, but I can think of at least 3 "big" Google papers (Maglev, Spanner, ALTS) with designs we had rejected years and years earlier, with seemingly no commentary on the problems that we had discovered. Anyway, we prefer to ship and keep on :)

      3 replies 9 retweets 116 likes
    4. Brecht Hoflack‏ @bhoflack May 15
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      Replying to @colmmacc @danluu

      Where can we read why they were rejected?

      1 reply 0 retweets 4 likes
    5. Colm MacCárthaigh‏ @colmmacc May 15
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      Replying to @bhoflack @danluu

      We rejected a Maglev-like design because probabilistic LB doesn't work for the vast majority of workloads. Most customers have only 2 LB targets, they're also often slow, and subject to garbage-collection pauses. Probabilistic LB increases utilization way too much.

      2 replies 3 retweets 41 likes
    6. Colm MacCárthaigh‏ @colmmacc May 15
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      Replying to @colmmacc @bhoflack @danluu

      It's a design that works well when you have lots of very fast, very consistent targets. You could say it worked well at Google then, but I'm not sure I'd agree. It also imposes that constraint tax on your ecosystem; teams may be forced to optimize way earlier.

      1 reply 0 retweets 16 likes
      Colm MacCárthaigh‏ @colmmacc May 15
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      Replying to @colmmacc @bhoflack @danluu

      Our world view of load balancers is that they primarily an organizational tool designed to free teams from problems and complexity. Helps you not work as much on HA, GC, or long-tail latency, quite as much. The paper reads like awesome bin-packing is what LB is about.

      8:31 AM - 15 May 2020
      • 1 Retweet
      • 26 Likes
      • h100gfld Bruno Rohée James Watters Kevin Spring Don MacAskill John Backus Evan Meagher Noise (previously known as Noise Reduction) FRIdS μ'sic forever
      1 reply 1 retweet 26 likes
        1. New conversation
        2. Colm MacCárthaigh‏ @colmmacc May 15
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          Replying to @colmmacc @bhoflack @danluu

          Colm MacCárthaigh Retweeted Colm MacCárthaigh

          ALTS shares many of the problems I put in my rant about mTLS. https://twitter.com/colmmacc/status/1057017343438540801 … Though ALTS is mTLS done about as well as it can be. We put our weight behind SIGv4 instead, even internally, and I think it's much much better.

          Colm MacCárthaigh added,

          Colm MacCárthaigh @colmmacc
          Ok. tweet thread time! Too long ago I promised to write a screed explaining how much I hated mutual-auth TLS and why. I got distracted, and I wasn't happy with the writing, so here it is in tweet thread form instead! But basically: Client certs and Mutual-Auth TLS is TERRIBAD.
          Show this thread
          1 reply 0 retweets 25 likes
        3. Colm MacCárthaigh‏ @colmmacc May 15
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          Replying to @colmmacc @bhoflack @danluu

          The pre-auth TCB of SIGv4 is basically SHA256. The pre-auth TCB of ALTS includes Protobufs. And it's a layering violation that puts AAA in a layer where request-smuggling can happen. Anyway, it's something now fixed AIUI, and gRPC is a good example of something better.

          1 reply 0 retweets 14 likes
        4. 4 more replies
        1. New conversation
        2. Rick Branson‏ @rbranson May 16
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          Replying to @williamsjoe @colmmacc and

          FB also uses a split L4/L7 design. It seems to be the thing to do.

          0 replies 0 retweets 1 like
        3. End of conversation

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