A Short Note on Atomicity and Ordering

February 15, 2016 ~ Adrian Colyer ~ 5 Comments

Just a short observation to start the week this week, inspired by the All File Systems are Not Created Equal paper that we looked at last week. Atomicity (or lack thereof) and (re-)ordering are common issues that crop up again and again in different guises to cause us problems in systems. It all boils down ... Continue Reading

Using Crash Hoare Logic for Certifying the FSCQ File System

February 12, 2016 ~ Adrian Colyer ~ 2 Comments

Using Crash Hoare Logic for Certifying the FSCQ File System - Chen et. al 2015 If you found yesterday's look at POSIX file system semantics and the crash recovery of applications built on top a little sobering, then today's paper offers a glimpse of a light at the end of the tunnel. Chen et al. ... Continue Reading

All File Systems are Not Created Equal: On the Complexity of Crafting Crash Consistent Applications

February 11, 2016 ~ Adrian Colyer ~ 10 Comments

All File Systems are Not Created Equal: On the Complexity of Crafting Crash Consistent Applications - Pillai et al. 2014 Last week we looked at Reducing Crash Recoverability to Reachability for file system-based applications. Today's choice predates that work and investigates the semantics of real world file systems and how this affects applications that run ... Continue Reading

How Complex Systems Fail

February 10, 2016 ~ Adrian Colyer ~ 10 Comments

How Complex Systems Fail - Cook 2000 This is a wonderfully short and easy to read paper looking at how complex systems fail - it's written by a Doctor (MD) in the context of systems of patient care, but that makes it all the more fun to translate the lessons into complex IT systems, including ... Continue Reading

The Heard-Of Model: Computing in Distributed Systems with Benign Failures

February 9, 2016 ~ Adrian Colyer ~ Leave a comment

The Heard-Of Model: Computing in Distributed Systems with Benign Failures - Charron-Bost & Schiper2007 We briefly touched on the Heard-Of model last week when we looked at PSync. It's really very elegant, so today I thought it would be good to take a closer look. The traditional view of fault-tolerant distributed systems makes the following ... Continue Reading

Chapar: Certified Causally Consistent Distributed Key-Value Stores

February 8, 2016 ~ Adrian Colyer ~ 1 Comment

Chapar: Certified Causally Consistent Distributed Key-Value Stores - Lesani et al. 2016 Another POPL '16 paper today. The Chapar framework provides for modular verification of causal consistency for both causally consistent key-value store implementations and for client programs written to use them. §1 also wins the prize for best use of emojis in a research ... Continue Reading

Is Sound Gradual Typing Dead?

February 5, 2016 ~ Adrian Colyer ~ 2 Comments

Is Sound Gradual Typing Dead? - Takikawa et al. 2016 Last year we looked at the notion of gradual typing in an ECOOP 2015 paper by Takikawa et al. based on TypedRacket. Today's choice from POPL 2016 by Takikawa et al. has the rather dramatic sounding title 'Is Sound Gradual Typing Dead?'. If the paper ... Continue Reading

Reducing Crash Recoverability to Reachability

February 4, 2016 ~ Adrian Colyer ~ 1 Comment

Reducing Crash Recoverability to Reachability - Koskinen & Yang 2016. Techniques such as shadow paging and write-ahead logging can help with recovery from crashes, but even then it takes a lot of sophistication to get it right and deal with cases such as crashing during recovery itself. In today's paper Koskinen and Yang first provide ... Continue Reading

‘Cause I’m Strong Enough: Reasoning About Consistency Choices in Distributed Systems

February 3, 2016 ~ Adrian Colyer ~ 3 Comments

'Cause I'm Strong Enough: Reasoning About Consistency Choices in Distributed Systems - Gotsman et al. 2016 With apologies for the longer write-up today, I've tried to stick right to the heart of the matter, but even that takes quite some explanation... We've looked at the theme of coordination avoidance before - instead of uniformly applying ... Continue Reading

Modelling the ARM v8 Architecture, Operationally: Concurrency and ISA

February 2, 2016 ~ Adrian Colyer ~ 1 Comment

Modelling the ARM v8 Architecture, Operationally: Concurrency and ISA - Flur et al. 2016 You can take all the care you like specifying, implementing, and verifying your software, but if the hardware it runs on is ill-defined at the end of the day you're just building on sand. In today's paper choice, Flur et al. ... Continue Reading

the morning paper

a random walk through Computer Science research, by Adrian Colyer
Made delightfully fast by strattic

Month: February 2016