6.824 Spring 2017 Paper Questions

For each paper, your assignment is two-fold. By 10PM the evening before lecture:

Submit your answer for each lecture's paper question via the submission web site, and
Submit your own question about the paper (e.g., what you find most confusing about the paper or the paper's general context/problem). You cannot use the question below. To the extent possible, during lecture we will try to answer questions submitted the evening before.

You can also upload your questions and answers using curl:

## Answer goes into lecN.txt
$ curl -F file=@lec2.txt \
       -F key=XXXXXXXX \
       https://6824.scripts.mit.edu/2017/handin.py/upload
## Question goes into sqN.txt
$ curl -F file=@sq2.txt \
       -F key=XXXXXXXX \
       https://6824.scripts.mit.edu/2017/handin.py/upload

Lecture 21

Suppose that we eliminated the pre-prepare phase from the Practical BFT protocol. Instead, the primary multicasts a PREPARE,v,n,m message to the replicas, and the replicas multicast COMMIT messages and reply to the client as before. What could go wrong with this protocol? Give a short example, e.g., ``The primary sends foo, replicas 1 and 2 reply with bar...''

Questions or comments regarding 6.824? Send e-mail to 6824-staff@lists.csail.mit.edu.

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