> If you're building something and you use a blockchain, rethink your life.
@stepanparr
Жыл бұрын
Great course team. Quick note: the "notes" link in the description is no longer found:
@sidharthaagrawal1440
4 жыл бұрын
A query on what are federated databases... When I think of a typical stateless distributed Service(not databases). They take in requests(REST GRPC etc) and maintain state in multiple databases for different types of data(MySQL and Cassandra and Influx etc). The service(we could call it middleware) knows how the rows in different databases are connected. So in some ways I could call this entire system as a Federated Database, but we don't. So my question is, what is the distinct feature of a system to be called a federated database from the system I described above. Is it the fact that the queries are in some SQLesque language and not REST etc? Or is it the fact that we can define a unified schema that is oblivious to underlying types of databases?
@ameypatel5774
4 жыл бұрын
The slide 14 states that if a participant crashes, the coordinator assumes that it has responded with an abort. In this case, shouldn't the coordinator send an abort message to the application request too (i.e abort the transaction)? In assignment 5, Question 1.d, the solution says that the transaction would commit in such a scenario.
@dukedud9743
Жыл бұрын
at 1:01:44 can any one tell me a range for 50 milliseconds of data is could be ? i mean how much bytes did we lost ?
@jpreddy9902
3 жыл бұрын
How are indexes stored in distributed environment? Do all the indexes get replicated on nodes or do they store only data that is present on that node?
@pb25193
4 жыл бұрын
Results of what??? I want to know,!!
@binshebah
4 жыл бұрын
He had a baby and he was thinking that he is not the father, so he was waiting for the result of the analysis.
@borre842
3 жыл бұрын
The URL for notes of the class is down ):
@andypavlo
3 жыл бұрын
I don't think we had notes for this lecture in 2019: Use Fall 2020 notes: 15445.courses.cs.cmu.edu/fall2020/schedule.html#nov-30-2020
@abdelrahman5094
3 жыл бұрын
اللي جاي من عند بشمهندس حماد يسوي لايك 😂😂
@FF-ne2qz
2 жыл бұрын
nobody understands your shitty lang
@move1649
3 жыл бұрын
primary-replica sounds better?
@FF-ne2qz
2 жыл бұрын
nope
@Paul-fn2wb
4 жыл бұрын
I read somewhere else and Wikipedia says: > CAP is frequently misunderstood as if one has to choose to abandon one of the three guarantees at all times. In fact, the choice is really between consistency and availability only when a network partition or failure happens; at all other times, no trade-off has to be made. I.e. there's no such thing as CA. en.m.wikipedia.org/wiki/CAP_theorem
@move1649
3 жыл бұрын
if we look at the reference which made that statement, it really came down to how we view the network failures/partitions, is it transient? Is it generally unreliable? usually when we design a system we make a bunch of assumptions when doing system modeling, in this example we make assumptions about the definition of "reliable network": is it reliable as not losing anything or it's a fair-loss situation as long as you keep retrying message eventually gets through or for how long does this relative unreliableness continue to be viewed as "reliable" plus network failure is usually not a "choice" you can make when leveraging a design, you make assumptions or test the behaviors and accept
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