In the context of a MapReduce deployment in Hadoop, what is the optimization that allows cutting down the amount of output sent by the mappers to the reducer?

(select the option that best fits the question).

In a cloud data center facility the total energy consumption is 3000 kW and the energy delivered to computing equipment is 2000 kW.

What is the PUE (power usage effectiveness) of this facility?

(select the option that best fits the question).

When considering MapReduce, Spark and Spark Streaming, which of the following assessments are correct?

(select all the correct options).

Function-as-a-Service (FaaS) aims to improve on the delivery model provided by Infrastructure-as-a-Service (IaaS). 

Identify the key aspects that FaaS deployments in serverless platforms need to take into account when hosting and executing functions.

(select all the correct options).

Consider an Infrastructure-as-a-Service deployment, in order to seamless extend computing resources for a small start-up company, in a real-life scenario employing replicated m front-ends and n replicated back-ends. 

When redirecting requests to the web application among a number of virtual servers, what situation can happen in the case of scaling and/or failures?

(select the option that best fits the question).

CNV-25-26 Exam 1:

Identification and Rules:

Please fill in your identification in the draft sheet you were provided. Return it at the end of the exam after completely closing your submission.

In the draft sheet and in this question you must insert your exam code given to you by the person watching the exam. You exam is not valid without the exam code.

The exam is without consultation (no other windows or apps beside the one where the exam is being done). Otherwise, exam is annulled.

The exam has a time limit of 80 minutes. You can only leave after submitting your exam and only after 45 minutes. We take the best grade of the two exams.

There will be no further information about the exam questions (dúvidas acerca do enunciado) provided during the exam, besides the question text itself.

Answer the questions given the context in the question.

There are 24 actual questions in total in the exam, all graded with the same weight except the Map-Reduce problem that has a weight twice a normal (all others) question (1 mark -> 0.8 in 1-20 scale). 

E.g. for a final grade of 8/20 ("valores") you need to sum up 10 marks, for a final grade of 15/20 ("valores") you need to sum up 18.75 marks. For a grade of 20/20 ("valores"), you need to sum up the 25 complete marks.

(Only if strictly needed, you can also insert here any other notes regarding the answering of some question(s) in the exam clearly identifying them in your comments). 

Considering the Map-Reduce paradigm and the Hadoop platform, analyse the following statements regarding the MR programming model.

(select all the options that are true sentences).

Considering a System VM (e.g., such as VMWare), identify where the virtualization takes place (i.e. the interface that is being virtualized in the guest VM) and its two components. 

(select the option that best fits the question).

When deploying applications in the Google App Engine PaaS, is the payment predominantly dependent on the number of servers allocated? Why or why not? 

(select the option that best answers the question).

Consider the garbage collection algorithm mark-and-sweep. 

(Classify the next sentence as true or false)

The mark-and-sweep algorithm achieves very good memory performance by itself due to the improved locality resulting from: i) the way objects are placed in memory, and ii) reduced fragmentation.