Blog posts
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The FLP theorem: impossibility of achieving consensus within distributed systems
For this week, my distributed systems course just assigned us students a reading assignment: “Impossibility of distributed consensus with one faulty process“. Apparently, this paper is a seminal piece of work that goes on to describe and prove that, given a single process failure within a distributed system, the underlying system cannot achieve consensus (i.e.…
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YouTube Review: “My Guitar Teacher TOMO FUJITA Gives Words of Wisdom”
I recently watched a YouTube video titled “My Guitar Teacher TOMO FUJITA Gives Words of Wisdom”. In this video (below), YouTuber Mary Spender interviews Tomo Fujita, a guitar instructor who taught at Berkelee school of music for over 20 years; he takes his years of accumulated knowledge and shares some words of wisdom. From this…
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Week in Review: 2021/01/17 – 2021/01/24
Not too much to report this week. Not because nothing happened, but because I wasn’t at diligent in capturing this week’s activities; I was on-call this week and carrying the pager almost always disrupts my flow, this week being no exception. My pager alarmed me out of bed several times (e.g. 12:30 AM, 2:30 AM,…
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Why is Lamport’s Scalar Clock only consistent, not strongly consistent?
For the last couple days, I’ve been watching the distributed systems video lectures and reading the recommended papers that cover logical clocks. Even after making multiple passes on the material, the concepts just haven’t clicked: I cannot wrap my mind around why Lamport’s clocks satisfy only consistency — not strong consistency. But now I think…
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8 fallacies of distributed computing
Rotem-Gal-Oz, A. (2005). Fallacies of Distributed Computing Explained. Cognitive biases (built-in patterns of thinking) and fallacies (errors in thoughts) creep into our every day lives, sometimes with us not even knowing it. For example, ever wonder why you work just a little harder, a little quicker, when you think someone is standing over your shoulder,…
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What are good models and what models are good?
Schneider, F. B. (1993). What good are models and what models are good. Distributed Systems, 2, 17–26. Paper Summary In his seminal paper on models (as they apply to distributed systems), Schnedier describes the two conventional ways — experimental observation; modeling and analysis — we normally develop an intuition when studying a new domain. And…
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Distributed Computing – Lesson 1 Summary
Summary Distributed systems are everywhere: social media, internet of things, single server systems — all part of larger, distributed systems. But how do you define a distributed system? A distributed system is, according to Leslie Lamport (father of distributed computing), a system in which failure of some component (or node) impacts the larger system, rendering…
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Spring 2021: Distributed Computing
Yes! I’m finally registered for the distributed computing course. This course is hot off the press! It’s spanking brand new to the OMSCS program and offered for the first time this (Spring 2021) term. I’ve been eagerly waiting over two years for a course centering around distributed systems, combining both theory and practice. The course…
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2020 year in review
Survival First things first: I’m grateful for surviving this difficult, weird and straight-up dystopian year. 2020 was the absolute worst; although the year will permanently leave its mark in our memories, we’re all ready to leave it behind, ready to move on. Who could have, apart from maybe Bill Gates during during 2014 Ted Talk,…
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Two memorable quotes from Ira Glass’s interview
While perusing Aaron’s Swartz’s blog, I stopped and read his post titled “Writing A Book: Part 2”. In this post, Aaron swoons over Ira Glass’s unparalleled storytelling skills. Wanting to learn more about Ira, I whipped out my iPhone, opened up my YouTube app, and loaded a (podcast) interview where Ira Glass shares his thoughts…
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Just a thought: On working from home
Like almost everyone else working remotely due to the COVID-19 global pandemic, I struggled with adjusting to the work from home situation, more than I could’ve possibly anticipated. I found difficulty in my daily routines suddenly disappearing; my deeply ingrained habits vanished out of thin air: no more commuting to the office; no more breathing…
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Reader expectations and three dimensions for emphasizing writing
Fred the dog beater Look at the above example, the four sentences. Now, take each of those sentences and imagine you poll an audience of 100 people, asking them the following question: “Does the author want you [the reader] to give Fred either a thumbs up or thumbs up?” How do you think the audience…
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You should NOT always prefer active over passive voice
Like many other aspiring authors, I’m always sharpening my writing skills, dozens of writing books (including one of my favorites: On Writing by Stephen King) lined up on my bookshelf. Almost all these books share the same stance when comparing the active and passive voices. They strongly prefer the active voice over the passive voice.…
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Want to improve your craft of writing? Imitate!
There are no shortcuts to becoming a great writer. As Stephen King says, great writers need to read a lot and write a lot. But that’s not enough. Nope. I’d argue you need to take writing one step further: imitate good writing. Imitating great tennis players When I was a young boy, about 8 or…
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To fading memories
One silver lining of COVID-19 is that I’m working remotely from home and despite the constant interruptions, I’ve grown to appreciate situation. I’m afforded experiences not normally available to me when working physically in the office. Among which is seeing my daughter grow up, right before my eyes. Every day, I catch these fleeting moments,…
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A short review on Zettlr (open source Zettelkasten app)
I serendipitously stumbled on another Zettelkasten desktop application called Zettlr. Perusing the online forum over at Zettelkasten.de, I had noticed that at least three of four members repping the app in their signatures. Naturally, I was curious so I followed the scent on the trail and loaded up the Zettlr website in my browser. After…
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Top 5 Zettelkasten.de forum posts
I’m obsessed with personal information management (PIM) and as I learn more about the discipline, one concept continues to repeatedly crop up: Zettelkasten. I first learned about Zettelkasten after reading one of my favorite books “How to take smart notes”, and since then, I’m sold on the idea and continue to tweak my digital workflow…
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Tagging my personal information management (PIM) with key/value pairs as key words
Generally speaking, there two ways people store their digital assets. Some file their digital assets— PDF documents, images, videos, bookmarks and so on — into neat, hierarchical structures. In the other camp are people who leverage tagging, assigning one or more key words to their files. When retrieving assets, these people tend to leverage their…
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Squeezing the most out of your study sessions (midterm and final exam preparation)
Why publish my studying techniques? This semester, I manage to pull off an A not only for the midterm and final exams, but for the class as a whole. My intention of revealing my grade is not to boast (that’s poor taste), but to give some credibility to the techniques and strategies below, techniques and…
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Neil Strauss’s 3 pass writing technique
Three passes World class writers sit down and pour out beautiful prose in a single sitting, right? That’s the image I image I held in mind for many years and this belief is not only far from the truth but this belief crippled me as a writer. I would sit down to type and proceed…
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Giant Scale Services – Summary and notes
Introduction We’ll address some questions like “how to program big data systems” and how to “store and disseminate content on the web in scalable manners” Quiz: Giant Scale Services Basically almost every service is backed by “Giant Scale” services Tablet Introduction This lesson covers three issues: system issues in giant scale services, programming models for…
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Free E-book: Advanced operating systems (AOS) refresher course – summary and study guide
Click here to download “Advanced OS refresher course – summary and study guide” I compiled my various blog posts from the advanced operating systems refresher course and bundled them together into a nicely packed e-book. So, if you are about to enroll in Georgia Tech’s advanced operating system course (AOS) and want to step through…
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Failure: I want more of it.
Students in the Georgia Tech program collaborate with one another — and collaborate with professors and teacher assistants — through a platform called Piazza. But at the end of the semester, this forum shuts off to read only mode, meaning we all lose connection with one another. Because of this, I recently created an e-mail…
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Enterprise Java Beans – notes and summary
Introduction Key Words: EJB, enterprise java beans Discuss how we can structure system software for large scale distributed sytem service Inter Enterprise View Key Words: monolithic, supply chain model, amalgam, survivability, complexity From a user perspective, we view a system (like Ebay or Google) as a blackbox. But in reality, much more complex than that…