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It was brought to my attention that the LSF registration deadline is today. If you are taking this course for credit, then please register in the LSF.

You wouldn't be able to receive credit for the course if you miss the registration deadline.

Lecture 3 slides posted

Written on 03.05.25 by Vaastav Anand

Lecture 3 slides have now been posted on CMS

Office Hours Timings and Location

Written on 28.04.25 by Vaastav Anand

Office Hours Timing: Mondays 2pm - 3pm

Location: Room 005, E1 5 (all mondays except 12th May, 2025)

Location on May 12th, 2025: Room 029, E1 5

Lecture 2 slides posted

Written on 25.04.25 by Vaastav Anand

Lecture 2 slides are now posted on CMS

Assignment 1 released

Written on 24.04.25 by Vaastav Anand

Assignment 1 is now released at: https://gitlab.cs.uni-saarland.de/os/cldrel-25ss/assignments/-/tree/assn1

Each student should have received an invite to join their own fork of the assignments repository.

If you did not get an invitation to your own fork of the assignments repo, then it means… Read more

Assignment 1 is now released at: https://gitlab.cs.uni-saarland.de/os/cldrel-25ss/assignments/-/tree/assn1

Each student should have received an invite to join their own fork of the assignments repository.

If you did not get an invitation to your own fork of the assignments repo, then it means we were unable to find your username in the gitlab system. Please ensure that you have an active gitlab account and then contact the instructors with your account details to get access to your own fork.

Assignment Due Date: 10th May, 2025. 5pm CEST.

Lecture 1 Slides posted

Written on 14.04.25 by Vaastav Anand

Lecture 1 Slides are now posted on the CMS website

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Reliability in Modern Cloud Systems

Cloud systems power a large fraction of the computing world today. Ensuring that these systems are correct and performant remains a key challenge that continues to bedevil developers. In this seminar, we will explore various themes around the various forms of reliability in modern cloud systems as well as learn about state-of-the-art strategies for mitigating incidents and understanding issues in modern cloud systems today.

Pre-requisites: Programming 2, Software Engineering Lab (Praktikum)

Recommended: Distributed Systems

Places: 20

Kickoff Meeting: 14.04.25, Monday 2:15pm-3:45pm

Lecture Time (23.04.25 onwards): Wednesdays, 2:15pm-3:45pm

Lecture Room: 005, E1 5

Office Hours (28.04.25 onwards): Mondays, 2pm-3pm

Office Hours Room: 005, E1 5 on all days except May 12th (Room 029)

Format

Each lecture will be divided into 2 parts:

- Lecture Part: In this part, the instructors will give a lecture on a specific topic in reliability.

- Discussion Part: In this part we will discuss the assigned reading and the previous week's lecture.

Assignments

All assignments will be based on Blueprint, a toolchain for generating microservice implementations and for exploring the design space of microservices.

Grading

- Assignment 1 - Implementing a basic Microservice Application using Blueprint: 10%

- Assignment 2 - Adding Observability to the Application and collecting traces from a workload: 20%

- Assignment 3 - Reproducing a Retry Storm: 25%

- Assignment 4 - Open Ended Project: 40%

- Participation in Discussion: 5%

Course Schedule

Date	Lecture Details	Readings	Assignment	Slides
09.04.25	No seminar	N/A
14.04.25	Part 1: Kickoff Meeting Part 2: From Monoliths to Microservices			Kickoff Logistics, Lecture 1
23.04.25	Part 1: Paper Discussion Part 2: The Tail at Scale	Blueprint: A Toolchain for Highly Reconfigurable Microservices	Assignment 1 released	Lecture 2
30.04.25	Part 1: Paper Discussion Part 2: Reliability Basics	Tales of The Tail: Past and the Future		Lecture 3
07.05.25	Part 1: Paper Discussion Part 2: The Pillars of Observability	If At First You Don’t Succeed, Try, Try, Again...? Insights and LLM-informed Tooling for Detecting Retry Bugs in Software Systems		Lecture 4
10.05.25	Assignment 1 Submission Deadline		Assignment 1 Deadline: 5pm CEST
12.05.25	Assignment 2 released		Assignment 2
14.05.25	No seminar
21.05.25	Part 1: Discussion Part 2: Of Failures and Incidents	Dapper, a Large-Scale Distributed Systems Tracing Infrastructure		Lecture 5
28.05.25	Part 1: Discussion Part 2: Cross System Interaction Failures	What bugs cause production cloud incidents?		Lecture 6
30.05.25	Assignment 2 Due; Assignment 3 released
04.06.25	Part 1: Discussion Part 2: Dealing with Metastability (Load Shedding Techniques)	Fail through the Cracks: Cross-System Interaction Failures in Modern Cloud Systems Metastable Failures in the Wild
11.06.25	Part 1: Discussion Part 2: Root Cause Analysis	TBD
18.06.25	Part 1: Discussion Part 2: Testing & Formal Methods	How to Fight Production Incidents? An Empirical Study on a Large-scale Cloud Service	Assignment 3 due; Assignment 4 released
25.06.25	Part 1: Discussion Part 2: Predicting and handling workloads	Executing microservice applications on serverless, correctly Building Reliable Cloud Services Using P# (Experience Report)
02.07.25	Part 1: Discussion Part 2: Hardware Reliability	Resource Central: Understanding and Predicting Workloads for Improved Resource Management in Large Cloud Platforms
09.07.25	Part 1: Data Center Design Part 2: Discussion	Characterizing Cloud Computing Hardware Reliability RAS: Continuously Optimized Region-Wide Datacenter Resource Allocation
16.07.25	Demos and Presentations		Assignment 4 due