CPSC 416, Winter 2017
Mon/Wed/Fri 3-4:00PM, HDP 110, UBC course page
Office hours: Stewart..... Mon 2:00-3:00 (X339) Ivan.......... Tue 3:00-4:00 (ICICS 327) Jodi.......... Thu 1:00-2:00 (X153) Amanda.... Fri 2:00-3:00 (Demco Table 1)
Leslie Lamport, a computer scientist who won the 2013 ACM Turing Award, gave the following definition of a distributed system:
Yet, distribution provides numerous benefits. A system becomes more fault tolerant if there are fewer points of failure and it has no centralized components. By extending the system with more physical nodes the system gains performance and becomes more scalable, capable of handling more load. Distribution can also improve latency, by improving geographic diversity, by placing resources closer to clients who use the system.
Achieving these benefits is not easy. As the quote above illustrates, distributed systems can fail in complex ways and these systems are more difficult to build, test, and understand than centralized systems.
This course will introduce you to a broad range of topics in distributed systems. The tentative topics are listed in the schedule below. For the most part this will be a lecture-style course. However, distributed system concepts are notoriously challenging to internalize without first-hand experience. The emphasis of this course, therefore, will be on building distributed system prototypes, small and large.
Course pre-requisites: CPSC 317 (networks) and CPSC 313
(computer hardware and operating systems).
Go programming language
In this course we will exclusively use the Go programming language for all assignments. Learning a new programming language is an important skill. You will practice it in this course. We will spend some time on January 13th covering the basics of Go. However, I will expect that you learn this language mostly on your own.
There are three optional books for this course:
Use the course Piazza for all course-related communication. The Piazza also supports private posts that you can use to communicate with the instructor and the TAs.
Course-level learning goals
The course will provide an opportunity for participants to
Schedule (a work in progress)
Go is a systems language designed at Google. It is especially well suited to building distributed systems. Like with any language, the fastest way to become proficient at Go is to put in the time writing programs in Go. Here are some resources to get you started:
There are seven assignments. All assignments must be completed in Go. You must work independently on assignments 1-5 and each student must submit their own solution source code. For assignments 6 and 7 you will work in teams of two. See collaboration guidelines at the bottom of this page for more information.
Solution must be submitted using the stash server by 9PM of the day of the deadline (except for A6/A7, which are due at midnight). Special instructions for compiling/running the code should be included as a README.txt file.
Assignments will be primarily marked based on functionality. Partial marks will be given to assignments that partially fulfill the specifications. It is in your best interest to properly comment and document your code to receive appropriate partial credit. All solutions must be formatted using gofmt.
To access the hand-in git repository for assignment X as student with undergrad userid UID, run the following command:
git clone https://stash.ugrad.cs.ubc.ca:8443/git/CS416_2016W2_/assignmentX_UID.git
Add your solution (and don't forget to push!) to the repository by the deadline.
Assignment deadlines are listed in the schedule above and below. Assignment descriptions will be linked to from this page once they are available.
To help you practice for the final exam we will typically go over 1-2 questions at the start of each class. You can download the set of practice questions we have covered so far (updated continuously).
Final exam: April 19, 12:00 PM, Location SRC B
Final course mark will be based off of:
Note that A6 and A7 must be done in teams of two people. The team's mark for these deliverables is the same for both team members.
The deadline for any assignment can be extended by one day with a 20% penalty to the mark. Assignments will not be accepted 24 hours past the original deadline.
If you have an emergency (e.g., health) that prevents you from meeting a deadline. You must notify the instructor before the deadline.
How to do well in this course
Learn Go early and practice it regularly. Learning a new language while being time constrained is stressful and not fun. Since the assignments rapidly increase in their difficulty, it will be to your advantage to learn Go as quickly as possible and to learn it well. The posted Go resources are a great starting point, but reading is no substitute for practice, bug, debug, practice, practice, bug, coffee, debug, practice, ...
Do not skimp on software engineering. Distributed systems are hard. They are hard to understand, to build, to debug, to run, to trace, to document, etc. Do not make your life any more difficult. Use best practices from software engineering to help you in this course. Write unit and integration tests, use version control, document your code with comments, write small prototypes, refactor your code, make your code readable and easy to run and debug. If you fail to follow best practices, they will come back to bite you later on. Unfortunately, this course will not explicitly teach you these best practices, but you probably took a course that introduced you to these concepts. If you have any questions, just ask us on Piazza.
Choose your teammates, wisely. The last two assignments (30% of your mark) depend critically on your ability to work effectively with one other student. You are responsible for resolving personal and technical differences among teammates on your own. Let us know as early as possible if you have team concerns, before they turn into crises.
Reach out for success. This is intended to be a challenging fourth year course, but that does not mean that you have to work through it on your own! The course piazza should be your first stop for all technical questions. The course has specific office hours (see top of page), but I and the TAs are flexible. Send any of us an email to schedule a time to discuss the course, the assignments, etc. University students often encounter setbacks from time to time that can impact academic performance. Discuss your situation with us or an academic advisor as early as possible. For help in addressing mental or physical health concerns, including seeing a UBC counselor or doctor, visit this link.
Academic honesty and collaboration guidelines
The department has a detailed policy regarding collaboration and plagiarism. You must familiarize yourself with this policy.
Assignments 1-5: You must work by yourself. No code sharing is allowed. You can use any code examples that you find on the internet for help, but use these as a starting point and write your own code. If you have consulted a specific resource extensively, then note this in the README file (better be safe than sorry).
Assignments 6: You must work in a team of two. Your team will receive a single mark for the assignment. No code sharing between teams is allowed. You can use any code examples that you find on the internet for help, but use these as a starting point and write your own code. If you have consulted a specific resource extensively, then note this in the README file (better be safe than sorry).
Assignment 7: Same as assignment 6, except that you cannot use the same team.
Many of the materials used in this course are derived from CMU's 15-440: Distributed Systems course from Spring 2014, and are used with permission from the content authors.