Exam Code: BF01
Exam Name: BCS Professional Certificate in Business Finance
Certification: BCS Other Certification
Total Questions: 132 Q&A
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NEW QUESTION: 1
The Hadoop framework provides a mechanism for coping with machine issues such as faulty configuration or impending hardware failure. MapReduce detects that one or a number of machines are performing poorly and starts more copies of a map or reduce task. All the tasks run simultaneously and the task finish first are used. This is called:
B. Speculative Execution
C. Default Partitioner
Speculative execution: One problem with the Hadoop system is that by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program. For example if one node has a slow disk controller, then it may be reading its input at only 10% the speed of all the other nodes. So when 99 map tasks are already complete, the system is still waiting for the final map task to check in, which takes much longer than all the other nodes. By forcing tasks to run in isolation from one another, individual tasks do not know where their inputs come from. Tasks trust the Hadoop platform to just deliver the appropriate input. Therefore, the same input can be processed multiple times in parallel, to exploit differences in machine capabilities. As most of the tasks in a job are coming to a close, the Hadoop platform will schedule redundant copies of the remaining tasks across several nodes which do not have other work to perform. This process is known as speculative execution. When tasks complete, they announce this fact to the JobTracker. Whichever copy of a task finishes first becomes the definitive copy. If other copies were executing speculatively, Hadoop tells the TaskTrackers to abandon the tasks and discard their outputs. The Reducers then receive their inputs from whichever Mapper completed successfully, first.
Reference: Apache Hadoop, Module 4: MapReduce
*Hadoop uses "speculative execution." The same task may be started on multiple boxes. The first one to finish wins, and the other copies are killed.
Failed tasks are tasks that error out.
*There are a few reasons Hadoop can kill tasks by his own decisions:
a) Task does not report progress during timeout (default is 10 minutes)
b) FairScheduler or CapacityScheduler needs the slot for some other pool (FairScheduler)
or queue (CapacityScheduler).
c) Speculative execution causes results of task not to be needed since it has completed on
Reference: Difference failed tasks vs killed tasks
NEW QUESTION: 2
It will best for Sara to use PaaS as a service delivery model as it will provide multiple hosting environments, PaaS Key characteristics are:
- Support multiple languages and frameworks
- Multiple hosting environments
- Allow choice and reduce lock-in
- Ability to auto-scale
NEW QUESTION: 3
Which of the following statements is false? Select the correct answer.
A. Increasing the quantity of data model transformation logic within a service composition
results in a decrease in the development effort required to build the service composition
due to the fact that the intrinsic data model mapping logic residing within services can be
B. Increasing the quantity of data model transformation logic within a service composition
results in an increase in the architectural complexity of the service composition due to the
incorporation of the additional data model transformation layers.
C. Increasing the quantity of data model transformation logic within a service composition
results in an increase in the development effort required to build the service composition
due to an increase in the necessary data model mapping logic.
D. Increasing the quantity of data model transformation logic within a service composition
results in a decrease in the performance of the service composition due to the need to
execute the data model mapping logic at runtime.
NEW QUESTION: 4
What does implementation of Enterprise Modernization solution do for clients?
A. Enables automation solutions that will increase the productivity of individuals and teams that are responsible for portfolio management
B. Ensures the security of both embedded software and IT systems that are critical to the business
C. Leverages an integrated, extensible, open platform that will facilitate smooth hand-offs between business processes
D. Reduces the total cost of ownership of their IT assets and increase their value
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