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

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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? Would you like to maybe share how you write your scripts or where you find the resource? I'm trying to look for script that can start multiple java instances at the same time, but I didn't find any. Thank you for any help.

the students' answer,

where students collectively construct a single answer

java -jar m2-ecs.jar -p 8081 &
java -jar m2-server.jar -b 127.0.0.1:8081 -p 8082 -d kv1 &
java -jar m2-server.jar -b 127.0.0.1:8081 -p 8083 -d kv2 &

Something like this should work

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