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Avis et commentaires pour d'étudiants pour Big Data Analysis with Scala and Spark par École polytechnique fédérale de Lausanne

2,507 évaluations
516 avis

À propos du cours

Manipulating big data distributed over a cluster using functional concepts is rampant in industry, and is arguably one of the first widespread industrial uses of functional ideas. This is evidenced by the popularity of MapReduce and Hadoop, and most recently Apache Spark, a fast, in-memory distributed collections framework written in Scala. In this course, we'll see how the data parallel paradigm can be extended to the distributed case, using Spark throughout. We'll cover Spark's programming model in detail, being careful to understand how and when it differs from familiar programming models, like shared-memory parallel collections or sequential Scala collections. Through hands-on examples in Spark and Scala, we'll learn when important issues related to distribution like latency and network communication should be considered and how they can be addressed effectively for improved performance. Learning Outcomes. By the end of this course you will be able to: - read data from persistent storage and load it into Apache Spark, - manipulate data with Spark and Scala, - express algorithms for data analysis in a functional style, - recognize how to avoid shuffles and recomputation in Spark, Recommended background: You should have at least one year programming experience. Proficiency with Java or C# is ideal, but experience with other languages such as C/C++, Python, Javascript or Ruby is also sufficient. You should have some familiarity using the command line. This course is intended to be taken after Parallel Programming:

Meilleurs avis

28 nov. 2019

Excellent overview of Spark, including exercises that solidify what you learn during the lectures. The development environment setup tutorials were also very helpful, as I had not yet worked with sbt.

7 juin 2017

The sessions where clearly explained and focused. Some of the exercises contained slightly confusing hints and information, but I'm sure those mistakes will be ironed out in future iterations. Thanks!

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476 - 499 sur 499 Avis pour Big Data Analysis with Scala and Spark

par Nikita V

11 mai 2017

I guess it's a goo introduction course into Apache Spark. Meantime I would expect deeper dive into optimizations and algorithms.

par Moiseenko A

6 mai 2020

There is not any course support at all.

Provided drafts of program assignments does not satisfy SOLID and Clean-code principles

par Kyle J

21 mai 2019

Pretty good, but one of the assignments was poorly set up. Some of the provided code was broken and it was very hard to debug.

par Virginija D

7 août 2017

Too entry-level after the first two much more challenging courses by M. Odersky.

par Jinyi S

9 mai 2021

It's a little bit difficult for me in its configuration part

par Hans R

25 oct. 2020

Explains the core concepts very well, but lacks depth.

par Mortatha K H

8 juil. 2020

it's hard for beginner understanding this course

par Ioannis A

25 sept. 2018

course needs to be updated

par Cherniaev A

7 févr. 2021

Good, but outdated course

par José F

17 avr. 2017

a let down and not up to par with other courses in the series.

Huge amount of time is wasted bsically repeating that the API is close to scala collections'. The huge amout of time is wasted again on very simple dataframe APIs including several slides presenting the show() function. Allow me to repeat : several slides presenting the show() function.

Finally the assignments are unimaginative and mechanical. The desciption is really confuse and most of the time is spend trying to chase small differences away to please the grader.

The sole part of the course that seemed interesting was the shuffling one, that was unfourtunately ignored on the assignments

Not related to the course but to spark: What utter mess are dataframes and datasets filled with boilerplate type conversions and runtime erros. I shy away in disgust form this untyped IDE-unfriendly monstruosity.

par Vladyslav S

6 mai 2017

Relatively decent video lectures, if not that blurry which makes text hard to read. Accompanied with awful practice lessons: - code templates are written with little to no style, even file reading is done in 3 different ways in all 3 lessons; - grader output is very confusing and almost useless; - unit tests, very useful to avoid some common caveats, were present in the first lesson, disappear completely in the last one.

Probably following spark's programming guide is better time investment, even if it misses some "humanity" of video lectures

par Prathviraj S C

25 févr. 2020

How to execute assignments and weekly work is not properly described in assignment task, it took lot's of time to understand how to execute the project and which software with what configuration is needed. This course is good to learn but submitting assignments is very much difficult. This course can become awesome if the proper guidance is provided for submitting tasks and if demo available how to execute the same.

par Mikołaj J

5 juin 2017

So many mistakes in the slides. Coding exercises are so hard to comprehend, it's tough to know what you are trying to achieve. I have already done a course in spark, this was supposed to be just refresher, but now I'm just confused...

par Owen N

9 avr. 2017

Course material was pretty good, but the lectures were hard to watch. Lots of editing problems, and blurring on the text (gave me a headache several times). Would rate higher if the videos were improved.

par Vassileios L

5 juin 2021

There is no Scala taught whatsoever, the title is misleading. I had to use stackoverflow in hardcore mode to be able to solve the assignments and the lessons did not help almost at all with that.

par rafael f o

7 juin 2020

not good teacher lessons

par Miguel A

19 nov. 2021

L​et me start by saying that the content and the assingments are interesting and give good information. The reason I'm giving it a low score is because it's evident that this course has been abandoned by the staff (and they never payed much attention to it to begin with). First, the videos are blurry from the overlay of slides and recording, they also contain mistakes that are fixed while the instructor goes through them. They are videos and it looks like it's been 5-6 years since they were recorded, definitely time enough to fix those things. But my main problem are the assignments: They use really old versions of java, scala and spark, which leaves students trying to find workarounds to install and use these old versions. Sometime the code doesn't match what the assignment is showing. The answers in the forums are sporadic and, usually, not that helpful to begin with. All of this wouldn't bother me too much in a free course, but not only this is not a free course, it's also part of the specialization so, regardless of all the issues mentioned, students have to do it and pay for the certificate if they want to get the full specialization.

par Dan O

25 mars 2017

Slow videos repeating several times the same thing (not a pedagogical / "good to fix an idea" kind of repetition), which makes them hard to follow.

However the worst are the exercises: the first time after 3-4 other Coursera Scala related courses where I have to actively check the forums for minute details about what is expected / implied for the solutions to pass the grading.

Things like what to do when updating the kmeans and you have duplicates, subtle differences between average and mean, etc. ...

In all other courses the expectation of the exercises were sufficiently clear and straight forward that I never had to check the forums to solve them.

Also, the code style of the exercises is literally an anti-pattern in idiomatic Scala, against everything learnt in the previous Scala courses: "var" all over the place, low level loops like in C or Java, etc. ...

par Марко И

10 avr. 2017

I don't know what happened but it seems they had technical or some other problem while preparing this course. Some assignments were more oriented to solving marginal problems then using Spark and distributed and parallel computing. And that is really annoying. Previous 3 courses were great, maybe this one will improve.

par Martin C S

17 févr. 2021

I can't give more than one star since the exercises contain too many mistakes, which are thoroughly discussed in the forums, have been acknowledged by the staff, and could be fixed in no time. As for the content I think it provides a good first overview.

par Deleted A

9 juil. 2020

good lectures another case of lectures not matching the assignment in terms of what you should pick up. inadequate resources and not enough depth on actual transformations and methods.

par Sergio R P

30 sept. 2019

The assignments are very confusing and unexplained. They do not take long to reply to the forum.

par Krzysztof S

3 mars 2020

Assignments don't work properly

par crow f

19 mai 2018

The course is too basic.