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

week 3/19 - 3/25

week 3/12 - 3/18

week 3/5 - 3/11

week 2/26 - 3/4

week 2/19 - 2/25

Requirement of Separating Directories/ Files For Each Server
While consistent hashing and metadata are used to keep track of the tuples belonging to each of the storage servers, is
2/25/23
Assumption about ECS / Client connection order
Hi, Can we make the assumption that for the first server, the ECS will connect to the KVServer before any clients do?
- 1 Unresolved followup
- 2 Followup Comments
2/25/23
Unable to parse keyRange response
How many spaces should be in between keyrange_success and the server keyranges? What is the exact form that is expected
- 3 Followup Comments
2/24/23
M2 ECS Clarifications
Could an instructor address the questions in: https://piazza.com/class/lctgp0rn94237x/post/122 The starter code seems o
2/24/23
Handling KVServer shutdown
If a KVServer goes offline abruptly, should the ECS silently reallocate the block of hashes that it was originally respo
2/24/23
M2 Report reused content
Should we include all the content about the M1 milestone in the M2 report, or only discuss new features that have been a
2/24/23
Expected Functionality of setupNodes Function
Hello, I was wondering what the expected functionality of the setupNodes function (pictured below) in the ECSClient.ja
2/24/23
Online tester error
Our group ran into an error. It seems like our repo needs to be reset. Any way to fix this?
- 2 Followup Comments
2/23/23
Error Handling
If we shut down all the servers, should the data still persist? i.e. if we start up one server again after they’ve all b
2/22/23
M2 Tester Log Level
Hello, The M2 Tester sets the log level of the ECS to "FINEST". This does not appear to be a standard Log4j lo
2/22/23
Milestone 2 Due Date
When is milestone 2 due? It is mentioned it is the week after reading week but there's no specific deadline.
2/22/23
Using Zookeeper
Hello,If we use ZooKeeper in our code, does it have to be started with the ECS server or can we start it manually (using
2/21/23
ECS & Server CLI and Communication
Hello,Just wanted to ensure I have a correct understanding on how the ECS and KVServers will work together.(1) Do both t
- 1 Unresolved followup
- 2 Followup Comments
2/21/23
keyrange_success payload
As I understand it, `keyrange_success` should be followed by semicolon separated triplets including the hash endpoints &
- 1 Unresolved followup
- 3 Followup Comments
2/21/23
Does ECS use the same command line options as KVServer?
Thanks.
2/19/23

week 2/12 - 2/18

week 2/5 - 2/11

week 1/29 - 2/4

week 1/22 - 1/28

question history:

question

68 views

Using Zookeeper

Hello,

If we use ZooKeeper in our code, does it have to be started with the ECS server or can we start it manually (using the command line)?

the students' answer,

where students collectively construct a single answer

There are ways to spin up a server from Java. Check out ZooKeeperServerMain.java or QuorumPeerMain.java, as the regular zooserver API is very very poorly written.

Proceed with caution. Using Zookeeper makes certain tasks easier but def makes it hard to config project for the autotesters.

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