Distributed Systems




CS 425 : ECE 428



Contact Course Staff

Fall 2017


Machine Problems (MPs)

  • This section on MPs is only for 4 credit students (on-campus or online) who are NOT MCS-DS. (3 credit students or MCS-DS are welcome to do the MPs, but we will not be able to grade or evaluate them or treat them as extra credit.)
  • All Machine Problems (MPs) will be posted here. There will be three to four MPs. Unless otherwise stated, you should work on your MP in groups of 2. You can discuss concepts and clarifications of the MPs with other students and the course staff, but all solutions, code, and ideas must remain within the group.
  • If you are a 4 credit on-campus/online student: By Thursday 9/7 @ 5 pm, you must let us know what group you are in. To do so, please do BOTH of the following (ONCE each):
    1. Fill out the form at this link, and
    2. Email  cs-425-staff@mx.uillinois.edu with subject line "CS 425 MP Group" stating the members in your group.

  • Any corrections will appear in red font in MP document. Please refresh (and check Piazza) often!
  • [MP1 Specification Document]: Released 9/5. Due @ 9/17 11.59 PM US Central Time. Demos on 9/18.
    • MP1 "Recommended" Solutions (released 9/24)
    • [C++] [Java] [Go] [Python]
    • These solutions are one among the many best solutions in the class. If your MP1 code doesn't work you can reuse these.
  • [MP2 Specification Document]: Released 9/19. Due @ 10/8 11.59 PM US Central Time. Demos on 10/9.
  • [MP3 Specification Document]: Released 10/19. Due @ 11/5 11.59 PM US Central Time. Demos on 11/6.
  • [MP4 Specification Document]: Released 11/9. Due @ 12/3 11.59 PM US Central Time. Demos on 12/4.

Homework Assignments (HWs)

  • This section on HWs is for ALL students (on-campus, online, MCS-DS, all credit levels).
  • Homework assignments (HWs) will be posted here. There will be about four to five HWs, and they will be handed out (approximately) bi-weekly. We will stagger HW deadlines so that they do not clash with MP deadlines.
  • ALL Students (on-campus, online, MCS-DS) must do all HWs
  • For HWs, you must submit hardcopy  are typed. Figures may be drawn by hand. Handwritten solutions will be returned without being graded. For each homework, please make sure each new problem solution starts on a fresh sheet, and that your name appears at the top of each sheet. Homeworks are due at the start of the lecture on the due-date (no excuses).

  • MCS Online students can email us HWs (by deadline time).
  • MCS-DS students must upload their HW on Coursera (do not email them to us).
  • All other on-campus students MUST PRINT their HWs for submission - we will not accept emailed solutions.
  • You must work on all homeworks individually.

  • You can discuss concepts and clarifications of questions with other students and the course staff.

  • Unless otherwise specified, the only resources you can avail of in your HWs are the provided course materials (slides, textbooks, etc.), and communication with instructor/TA via the forum, e-mail, and office hours.

  • Any major corrections will appear in red font in HW document. Please refresh!
  • [HW1 Document]: Released 9/5. Due @ 9/26 Start of Lecture. [HW1 Solutions] (solutions released 9/28)
  • [HW2 Document]: Released 9/26. Due @ 10/10 Start of Lecture. [HW2 Solutions] (solutions released 10/12)
    • 9/27: Small clarification to Q4 added to HW2 doc
  • [HW3 Document]: Released 10/19. Due @ 11/7 Start of Lecture. [HW3 Solutions] (solutions released 11/10)
    • Small correction on HW3 Q3 solution 10/22.
  • [HW4 Document]: Released 11/9. Due @ 12/7 Start of Lecture. [HW4 Solutions] (solutions released 12/8)
    • Small correction on HW4 Q7 solution 11/20.


    • ALL Students (on-campus, online, MCS-DS) must take both Midterm and Final Exams. If you are off-campus (MCS Online or MCS DS only) you will need to use a proctor.
    • Midterm Exam around the middle of the semester. See Course schedule (Lectures) for a tentative date. It will be closed-book, closed notes. Calculators ok. NO cheatsheets or cellphones or other devices allowed.
    • Final Exam is at the end of the semester. The schedule is decided by campus, so please don't ask course staff for dates. When campus posts it, we will post it on the course website. Please do not contact us to find out or change final exam date.
    • Makeup/Conflict exams: If you need a makeup exam, please contact Indy at least 2 weeks before the posted exam date (midterm/final). Conflict exams are not given for routine reasons (includes interviews, trips, conflicts with other classes, etc.). Indy's decision is final on each case.
    • [Practice Midterm] Released Oct 10. We will not release solutions (but feel free to use Piazza to discuss solutions for the practice midterm (only)).
    • [Midterm Solutions] Released Oct 19.

    Regrading Policy

    • This section on regrading policy is for ALL students.
    • All regrade requests must be submitted back within 1 week of the graded HW/MP being returned. Regrade requests must be in writing on a separate piece of paper, and must clearly indicate the question number(s) and part(s) to regrade (and if necessary, the reason for the regrade request).
    • If you are an online or MCS-DS student, please submit your regrade request via email to the staff mailing list. Please document clearly on a separate page what your regrade request is (see earlier bullet point). The 1 week deadline still holds.
    • Regrade requests submitted after one week of the HW/MP being returned will not be regraded.
    • All regrading decisions will be final (i.e., no regrade requests on regrades).