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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

week 4/2 - 4/8

week 3/26 - 4/1

week 3/19 - 3/25

week 3/12 - 3/18

week 3/5 - 3/11

week 2/26 - 3/4

Server/Client behavior is ECS is killed
What is the expected behavior if ECS is killed? Should servers continue to accept requests/store data? Should they shut
- 1 Followup Comment
3/4/23
Important assumptions about M2
Let's assume server A and server B, both of which have no data, are added to ECS. Now let's say server C, which
3/4/23
Auto tester not working
When trying to run the autotester, it shows that nothing gets run, as shown below. The tester does not even attempt to c
- 3 Unresolved followups
- 5 Followup Comments
3/4/23
M2 Assignment Feedback
I have two pieces of feedback for the M2 milestone so far that I hope can be addressed by M3: 1. The starter code is ou
- An instructor thinks this is a good question
- 2 Followup Comments
3/4/23
Performance Testing
Hello, Does the performance testing for m2 need to be for both latency and throughput? Or can it just be for one of th
- 4 Followup Comments
3/3/23
Not Enough Disk Space for Enron Data Set
I'm running out of disk space when I do: wget http://www.cs.cmu.edu/~enron/enron_mail_20150507.tar.gz How are we
3/3/23
Clarification of the M2 instruction on retry operation
From the first screenshot my understanding is that we will display retry to the client front-end to be "transpare
- 1 Unresolved followup
- 7 Followup Comments
3/3/23
M2: Is ':' part of what's being hashed by hash(ip:port)?
The email announcement yesterday reminds us that: As stated in the handout, you MUST use md5 for hashing. During the de
3/3/23
Is the connection between a KVServer and the ECS supposed to be kept open?
Can a KVServer use different ports for communicating with the client and ECS? A ServerSocket cannot initiate any connect
3/3/23
Remove of a Server
The client use metaData to find the correct server, but what if the server it connected to is removed and it cannot get
3/3/23
M2 Test Cases
Are there no new test cases provided for M2? The instructions say "Together with this handout, we provide you with a
3/3/23
Teaching Team Ignored Extension Request?
A post was made on Sunday last week, Piazza post @143, with 39 upvotes (the most upvoted Piazza post yet). The teachin
- 2 Unresolved followups
- 4 Followup Comments
3/3/23
Repository error - Need to reset
Ran into the same error again. Can we get a reset please?
3/2/23
Question follow up
Does anyone know the answer to post @140?
3/2/23
M1 Component Weights
How are the bonus, report, and demo weighted for A1? I can't seem to find the exact weightings on Quercus.
3/2/23
Message Format
Are there any reserved characters that we can assume WON'T be used in keys, values, or messages? I'm asking for
3/2/23
Adding servers to ECS
Can we assume that the whole process of adding a server to ECS will be fully complete before initiating the addition of
3/2/23
Persistent Storage for M2
Hello, I wanted to know what the expectation for persistent storage was in the context of M2, and I have a couple relat
- 4 Followup Comments
3/1/23
Removal of a server metadata update question
Hi, I'm curious why we would want to send a metadata update to the successor server (A) when removing a server (B)
3/1/23
Can the follow up to @146 be addressed?
Can the follow up to @146 be addressed? The online tester can't be run.
- 1 Unresolved followup
- 1 Followup Comment
3/1/23
Does the ECS Create the KVServers?
Is the ECS supposed to launch the requested number of KVServer.jar? Or should it just sit there waiting for new KVServer
- 1 Unresolved followup
- 1 Followup Comment
3/1/23
Metadata and message size
What happens if metadata that we want to send between client/server/ECS exceeds our predefined message size?
2/28/23
What if the KVStore tries to access a server that has shut down?
Case 1: Client Does Not Know Any Active Servers Say we initially have server A and client A knows about this server. Th
- 1 Followup Comment
2/28/23
Github classroom tester issue - maybe needs to be reset
Also, I cant even schedule a retest....
- 4 Unresolved followups
- 12 Followup Comments
2/28/23
SERVER_WRITE_LOCK under different conditions
Hi, I wanted to know about the conditions with which we set the SERVER_WRITE_LOCK as I feel it's a bit ambiguous in
- 1 Unresolved followup
- 4 Followup Comments
2/26/23
Wk 6 Quiz
Hello would it be possible to open up wk6 quiz?
2/26/23
M2 Extension Request
There is a lot going on with other midterms, iron ring ceremonies, and graduation events between March 4-March 10th and
- 5 Unresolved followups
- 5 Followup Comments
2/26/23

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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Adding servers to ECS

Can we assume that the whole process of adding a server to ECS will be fully complete before initiating the addition of another server?

the students' answer,

where students collectively construct a single answer

I mean you can enforce that in your ECS code if you want it to be the case. Just makea queue of server addition requests and processes them one at a time

~ An instructor (Michalis Bachras) endorsed this answer ~

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