pinned

Crowdsourcing final answers
Would people prefer a shared google doc to compare final answers? #pin
- 3 Followup Comments
4/18/23
Search for Teammates!
- 3 Open Teammate Searches
1/12/23

week 4/30 - 5/6

Final marks
when will final marks be released?
- 1 Followup Comment
5/2/23

week 4/23 - 4/29

m4 marks
when will m4 marks be released?
- 1 Followup Comment
4/27/23

week 4/16 - 4/22

Milestone 2 Tester Bonus Marks
Just a reminder to consider the bonus marks for using the online tester for M2 before the M3 deadline, as per the announ
- An instructor thinks this is a good question
4/22/23
GG
We ball
- 3 Followup Comments
4/20/23
Found Lost Airpods in Exam Room 3153
Hey there! I found a pair of airpods in exam room 3153. Wanted to give it to the invigilators but they left. Ill give i
4/20/23
piazza response rate💀
- 1 Followup Comment
4/20/23
Lecture question on Reed Solomon Code
Can someone confirm the answer above is correct? My understanding is we can always recompute parity bytes using parity
- 2 Followup Comments
4/19/23
CAN routing number of neighbour nodes
Hello, This slide seems to suggest that in CAN routing each node can maintain up to 2d neighbour nodes. However, thi
- 1 Followup Comment
4/19/23
3
question on class of 9's
Let's say a system is 98.9999% available which is close to 99%. Will class of 9's measure still say it's one
4/19/23
Using iPad to handwrite the cheat sheet
Hello, I would like to get clarification from an instructor on whether handwriting my cheat sheet on an iPad and then pr
- 3 Followup Comments
4/18/23
Piazza answering
It would be great if we could get some answers on the piazza, especially considering how close to the final exam we are.
- 1 Followup Comment
4/18/23
2
2019 Final Q3 Execution sequence for each process
How would a "valid execution sequence for each process" look like? Is it writing the order for each different
4/18/23
1
Requirement analysis (Safe, Liveness, Ordered) for Lamport algorithm?
How can we prove Lamport ME algo is safe and live? fairness is easy to prove as a priority queue is maintained at all no
4/17/23
2
nodes affected when splitting CAN
why are only O(d) nodes effected? are we counting the neighbours who need to update their routing table?
4/17/23
1
question RE number of neighbours in CAN
each node has 2d neighbours but here Node 4 has 6 neighbours. Is it possible?
4/17/23
1
Question RE Chord key location
should it paraphrase to "look for predecessors first" instead of successor of key? for the last location we sele
4/17/23
1
Consistency model ranking
If a system is sequentially consistent does that mean it's also casual/FIFO/weak consistent? Does this logical apply
- 2 Unresolved followups
- 2 Followup Comments
4/17/23
6
root tablet vs. metadata tablets vs. user tablets
What's stored in each and why do we need all three?
4/17/23
1
Question RE coordination service
Why do we still need Master in BigTable to do load balancing when there is Chubby as coordination service? Seems it'
4/17/23
1
Question about reliability in lecture
In week 1 slide 2 pg.7 I can understand the highly available part but why is it highly unreliable?
- 1 Followup Comment
4/17/23
mapreduce quiz answers
can the marks get released? we're waiting on q1 and q2 to be graded.
4/17/23
1
Photocopy Aid Sheet to Prevent Smudging
Hi, I know that we can use the Examination Aidsheet in which we have to write it by hand, but I was wondering when I f
- 1 Unresolved followup
- 3 Followup Comments
4/16/23

week 4/9 - 4/15

Wk7 Quiz Question
I don't quite understand why query() for b3 is not 2 b3 has a = {1}, and r = {1,2} which are all correct then why i
- 1 Followup Comment
4/15/23
3
2019 Final Exam Question 1 c)
Question 1c asks to find 3 pairs of concurrent events using only Lamport clocks. Does this mean "using the event d
- 4 Unresolved followups
- 4 Followup Comments
4/15/23
7
Optimal dimensions for CAN routing given node number
I made a plot for the average routing path length on desmo https://www.desmos.com/calculator/xs60xtqkzl seems when n =
4/15/23
1
Further Request for M3 Mark Releases
I understand marking is time-consuming but as we approach the week before the final exam as well as a couple of hours be
4/14/23
4
m3 marks
m3 marks... can they be released?
4/12/23
2
Are We Required to Pass the Exam?
Greetings Prof/TAs, I was informed that some courses have a requirement were we must pass the final exam (>50%) in
- 2 Followup Comments
4/12/23
M4 Presenting Load Balancing
If our group choose to implement additional server-side features such as load balancing, we realize it would be hard to
4/11/23
1
Final Exam Aid Sheet
Hello, I noticed that the final exam is Type C and we're allowed to bring in an aid sheet. Does this aid sheet need
4/9/23
posting solutions to old finals
can the solutions to the old final please be posted? thanks,
- 2 Unresolved followups
- 2 Followup Comments
4/9/23

week 4/2 - 4/8

nvm
nvm
4/4/23
2
discussion board monitoring
Piazza monitoring can really be improved. Loads of unanswered questions that are over a week old.
- 1 Unresolved followup
- 1 Followup Comment
4/4/23
2
Quiz this week?
Is there a quiz this week? Thanks,
- 1 Unresolved followup
- 1 Followup Comment
4/3/23

week 3/26 - 4/1

M4 based on M2 or M3 and relation to grades
Hello, I wonder if we finished M3, but our M4 functionality does not actually require us to have finished M3 but instea
3/30/23
1
Follow up on @210
Is it possible to get a reply to @210? solution: @214_f2
- 2 Unresolved followups
- 2 Followup Comments
3/29/23
4
nvm
nvm. Have a nice day!
3/27/23
2
Last day of class
When is the last day of scheduled classes? Do we have in person lecture on April 13?
3/27/23
1

week 3/19 - 3/25

MS Client from Different Machine
How will this test be carried out? Do we have instructions for connecting to a different machine?
3/25/23
2
p
- 2 Unresolved followups
- 2 Followup Comments
3/25/23
5
NullPointerException in build.xml when running ant test.
When running ant test, I get the following error: The most recent line is 134 in build.xml, which is this: I don&#
3/25/23
1
Assumptions about replication and number of servers
each data item should be replicated on exactly two storage servers that are succeeding the coordinator on the ring topo
3/25/23
3
Online Tester Thread Limit?
Is there a thread limit to the online tester? We are getting very weird errors like messages being sent but not received
3/24/23
1
No comments on m2 report visible
As title.
- 1 Unresolved followup
- 2 Followup Comments
3/22/23
4
What is expected in the test report?
My group got a comment for the M2 report saying that our test report was missing all test cases. We're wondering wha
3/22/23
2
Retry PUT/GET after redirect to the correct server
Hi, I'm trying to debug the retry PUT/GET function after client updates its metadata and connect itself with the se
3/22/23
1
Testing Suggestion
Let's say I have a sequence of interactions I would like to test on both client and ECS as follow: - Start ECS and
3/22/23
Milestone 3 submission and milestone 2 grades
Hi, currently there's no milestone 3 report submission page on Quercus - when will that be available? Also, could we
3/22/23
2
Week 9 quiz
As title. Will it be released soon?
3/21/23
3
Online Tester Bonus Judging
It seems that the infrastructure is very slow sometimes. Will the latest run we do on the tester be used for determining
3/20/23
2
Assign hashring objects clockwise or counter-clockwise?
Hi, Should the hashring assign items clockwise or counter-clockwise? According to the M2 (first image), it was counter-
3/20/23
2
Does "ant test" take infinitely long to run for anyone after updating to java 9?
We just updated our java version to java 9 and now running ant test with any testsuite added results in it being stuck l
- 5 Followup Comments
3/20/23
6
KEYRANGE_READ_SUCCESS message
We're confused about what KEYRANGE_READ_SUCCESS should return, since the M3 autotester accepts both results, but end
3/19/23
5
Update on @191?
Is there an update to @191?
3/19/23
1

week 3/12 - 3/18

week 3/5 - 3/11

Do we have to implement keyrange_read?
I am wondering why do we need the keyrange_read client command? Why cannot we just find the 3 servers that can serve th
- 1 Unresolved followup
- 1 Followup Comment
3/11/23
Command line script to run on the ug machine
Hello, Has anyone made an effort to automate the running the ecs and server system using maybe command line scripts? Wo
3/11/23
Where is the raft consensus lecture?
Hello, I saw an announcement that the raft consensus lecture is in Modules on Quercus, but I can't seem to find it.
3/10/23
Testing when a server is down.
How does failure detection differ from the shutdown hook? i.e. how can we forcefully cause a running server process to
3/7/23
Quiz for this Week
Hello, I was wondering if there was going to be a quiz for this week, and if so, which topics it will cover. Thank y
3/6/23
.
3/6/23
Late Report
Hi, we forgot to submit our report. If we submit the report late, do we lose 20% on the report or do we lose 20% on the
3/5/23
Autotester PUT test case
There is a test case in the autotester that sends this message to KVServer: put @12347 -/() abc def The server returned
3/5/23
Socket exception when disconnect and reconnect to a new ip:port server
Have been debuggin this error for hours and would really appreciate some help. Here's my logic in KVStore to reroute
3/5/23

week 2/26 - 3/4

week 2/19 - 2/25

week 2/12 - 2/18

week 2/5 - 2/11

week 1/29 - 2/4

week 1/22 - 1/28

question history:

question

80 views

Testing when a server is down.

How does failure detection differ from the shutdown hook?

i.e. how can we forcefully cause a running server process to fail as opposed to using the shutdown hook via ctrl c?

Would this be done by sending a kill signal?

the students' answer,

where students collectively construct a single answer

the instructors' answer,

where instructors collectively construct a single answer

yes. you can use kill -9 to kill the jps.

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