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HenryR's profile
Henry Robinson
Henry Robinson
Henry Robinson
@HenryR

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Henry Robinson

@HenryR

Infrastructure @SlackHQ. Distributed systems engineer. I have of late - but wherefore I know not - lost all my data.

San Francisco, CA
the-paper-trail.org
Joined March 2007

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    Henry Robinson‏ @HenryR Jan 22
    • Report Tweet

    This paper that improves clock synchronization accuracy to tens of nanoseconds is amazing work. What changes with that level of accuracy? Like the paper says, Spanner commit times get a lot shorter. But is it now safe to take action without coordination? https://www.usenix.org/system/files/conference/nsdi18/nsdi18-geng.pdf …

    6:07 PM - 22 Jan 2020
    • 34 Retweets
    • 162 Likes
    • Hasan Hicsasmaz Michael Daniels ꙮ Jonathan Giddy Mark Callaghan XAR 🦉 Nick G Attrecto Mali Akmanalp
    4 replies 34 retweets 162 likes
      1. New conversation
      2. Henry Robinson‏ @HenryR Jan 22
        • Report Tweet

        One of the classic examples is leader failover: when is it safe for a replica to start serving? We only have to wait to be sure the original leader had realised it’s stopped getting heartbeats. So theoretically a tighter clock sync makes that wait time shorter. But...

        1 reply 0 retweets 6 likes
        Show this thread
      3. Henry Robinson‏ @HenryR Jan 22
        • Report Tweet

        my guess is that other factors, like scheduling delays, dominate in this case and contribute to potentially significant variance before a leader realizes what’s up. Putting the clock check on the critical path mitigates this at the expense of lots of clock checks.

        1 reply 0 retweets 7 likes
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      4. End of conversation
      1. New conversation
      2. ☭ 🐇‏Verified account @palvaro Jan 22
        • Report Tweet
        Replying to @HenryR

        henry is this a rhetorical question or...? do I need to read the paper right now?

        2 replies 0 retweets 0 likes
      3. Henry Robinson‏ @HenryR Jan 22
        • Report Tweet
        Replying to @palvaro

        Henry Robinson Retweeted Heidi Howard

        I mean Heidi thinks she might be out of a job, so calibrate your threat level accordingly:https://twitter.com/heidiann360/status/1219629171590287360?s=20 …

        Henry Robinson added,

        Heidi Howard @heidiann360
        I just saw a fantastic talk by Balaji Prabhakar from @StanfordEng on Huygens and fear I might be out of a job soon. I'd definitely recommend checking out their paper from NSDI 2018: https://www.usenix.org/system/files/conference/nsdi18/nsdi18-geng.pdf … pic.twitter.com/XrwqamKq8R
        Show this thread
        2 replies 1 retweet 9 likes
      4. 7 more replies
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      2. Carlos Baquero‏ @xmal Jan 23
        • Report Tweet
        Replying to @HenryR

        It’s a very nice paper that advances the tightness that can be achieved with clock synchronization. Don’t think by itself it makes agreement and durability obsolete.

        1 reply 0 retweets 11 likes
      3. Henry Robinson‏ @HenryR Jan 23
        • Report Tweet
        Replying to @xmal

        I agree in the strict sense, but I wonder how close we are to practically being able to appeal to probabilistic arguments about the chances of A and B having observed the same instant.

        0 replies 0 retweets 6 likes
      4. End of conversation
      1. New conversation
      2. Bill de hÓra‏ @dehora Jan 23
        • Report Tweet
        Replying to @HenryR

        unroll plz @threadreaderapp

        1 reply 0 retweets 0 likes
      3. Thread Reader App‏ @threadreaderapp Jan 23
        • Report Tweet
        Replying to @dehora

        Bonjour, the unroll you asked for: Thread by @HenryR: This paper that improves clock synchronization accuracy to tens of nanoseconds is amazing work. What… https://threadreaderapp.com/thread/1220166015838900224.html …. Talk to you soon. 🤖

        0 replies 0 retweets 1 like
      4. End of conversation

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