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danluu's profile
Dan Luu
Dan Luu
Dan Luu
@danluu

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Dan Luu

@danluu

https://patreon.com/danluu 

danluu.com
Joined December 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 639 likes
      Show this thread
    2. Cindy Sridharan‏ @copyconstruct May 15
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      Replying to @danluu

      Funnily enough, I’ve had Amazon (some still at Amazon, some ex—Amazon) employees who then went on to work at google tell me that the thing they *like* and *miss* about Amazon is the simplicity (unsophisticated-ness) of things.

      3 replies 5 retweets 123 likes
    3. Cindy Sridharan‏ @copyconstruct May 15
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      Replying to @copyconstruct @danluu

      A lot of systems were very unsophisticated compared to the counterparts at Google (might translate to “worse engineering” in some people’s minds), but that made working with those systems simple and the failure modes (and limitations) of those systems well-understood.

      5 replies 9 retweets 95 likes
    4. Cindy Sridharan‏ @copyconstruct May 15
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      Replying to @copyconstruct @danluu

      purely going by some postmortems of very public outages, it seems like a lot of GCP’s problems stems from certain engineering patterns used across the board which has very nasty failure modes arising in no small part due to the complexity of the architecture in the first place.

      2 replies 3 retweets 51 likes
    5. Cindy Sridharan‏ @copyconstruct May 15
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      Replying to @copyconstruct @danluu

      Cindy Sridharan Retweeted Cindy Sridharan

      And the same can also be seen in the papers Amazon and Google publish. I find most of Google engineering to be incredibly sophisticated but also almost always incredibly complex. Amazon, almost always, favors pragmatism. I always think about this paper: https://twitter.com/copyconstruct/status/1061729541884862465?s=21 …https://twitter.com/copyconstruct/status/1061729541884862465 …

      Cindy Sridharan added,

      Cindy Sridharan @copyconstruct
      Link to paper https://bit.ly/2AYOPBx  It's interesting in an era where transactional systems are making something of a comeback and Google's preaching about why we should choose strong consistency, whenever possible (http://bit.ly/2AYq6wY ), Amazon picks different tradeoffs pic.twitter.com/GUwA8sEWQ6
      Show this thread
      3 replies 7 retweets 88 likes
      Dan Luu‏ @danluu May 15
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      Replying to @copyconstruct

      Yeah, GCP postmortems are interesting! How many other companies could have an outage that stemmed from running their global SDN on top of their cluster manager? Free blog post idea: a list of GCP outages that most companies couldn't even dream of having. https://status.cloud.google.com/incident/cloud-networking/19009 …pic.twitter.com/Ac7c2Jni8Z

      Google's network control plane runs under the control of different instances of the same cluster management software ...

Two normally-benign misconfigurations, and a specific software bug, combined to initiate the outage: ... network control plane jobs and their supporting infrastructure in the impacted regions were configured to be stopped in the face of a maintenance event ... multiple instances of cluster management software running the network control plane were marked as eligible for inclusion ... the software initiating maintenance events had a specific bug, allowing it to deschedule multiple independent software clusters at once ...

The outage progressed as follows: at 11:45 US/Pacific, the previously-mentioned maintenance event started in a single physical location; the automation software created a list of jobs to deschedule in that physical location, which included the logical clusters running network control jobs. Those logical clusters also included network control ...
      5:13 PM - 15 May 2020
      • 10 Retweets
      • 52 Likes
      • Sergey Mushinskiy Super Duper Max Daniel Houck Niall Murphy Rafael Jesus Shelby Spees (she/her) Alec Morten Grouleff Boris FELD
      1 reply 10 retweets 52 likes
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