Amazon Interview Question SDE-2s
Country: United States
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VotingOccation
- Diego July 26, 2019Name
StartDateTime
EndDateTime
Candidates[]
VotingOccationAddress
VotingOccation
Address
AmountOfVotesCommunicated?
HasBeenProcessed
NoFraud
VotingOccationAddressResult
VotingOccation
Candidate
Address
NumberOfVotes
VotingOccationResult
VotingOccation
Candidate
NumberOfVotes
FraudInstance
VotingOccation
Address
Person
PersonVotes[]
Candidate
Name
Vote
VotingOccation
Candidate
VotingAddress
TimeStamp
HasBeenUploaded
HasBeenProcessed
Person
Name
SSN
VotingAddress
Address
VotingPerson
RegistrablePerson
VotingOccation
Address
IsRegistered
VoteTimeStamp?
PersonVote
VotingOccation
VotingPerson
VoteTimeStamp (no candidate)
HasBeenProcessed
----------------------------------------------------------
Distributed system:
Locations:
Each location (votingAddress) will have information about:
1) all incoming occations/the candidates
2) the people voting in that address for incoming occations (VotingPerson)
3) all the people (Person) that is VotingPerson for that address
Each location will:
1) Validate that the person can vote there AND hasn't voted yet for this election.
2) Register a vote (no known person but known candidate) and a personVote (known person, not known candidate)
3) Upload to the centralizer the amount of votes expected AFTER the voting day has finished
4) Sync the votes and the PersonVotes with the centralizer
Centralizer:
1) will download all the addresses votes and PersonVotes
2) ProcessLocalVotes
will process all addresses first (checking that they have votes in.)
This will be called many times until VotingOccationAddress only has "true"s
Will detect fraud (PersonVote for the same person in more than one Occation)
3) ProcessGeneralVotes
will process all the local votes into general votes.
4) Will allow to check what's the address for the person for this occation
void ProcessLocalVotes(VotingOccationAddress voa)
{
//validate that it's not processed yet
//Take N votes that have not been processed and accumulate into the VotingOccationAddressResult
//mark those votes as processed and accumulate the votes in the same transaction
//Take N votePeople that have not been processed and do fraud calculation
//if person hasn't voted (VotingPerson.TimeStamp == null)
//mark the timestamp
//else
//fraud
//if all the votes received (Vote for that address and that voting occation)
//matches the AmountOfVotesCommunicated and the PersonVote
{
//we check for frauds already committed on the previous check
//we mark the whole VotingOccationAddress as HasBeenProcessed
}
}