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NEW QUESTION: 1
Understanding customer requirements is important and each customer has different needs. Which two of the following challenges are more likely to be faced by governments as well as enterprise customers? (Choose two.)
A. Improve service delivery
B. Increase operational efficiencies
C. Increase customer satisfaction
D. Reduce costs
E. Increase business agility
F. Ensure safety and security
Answer: A,D
NEW QUESTION: 2
Company has asked for an OOB management network design. Which option is one
Cisco
best practice parameter that must be followed?
A. Data networks must traverse the management network as a backup path
B. Data networks must be limited to SSH, NTP, FTP, SNMP and TaCACS+ protocols
C. Data networks must never traverse the management network
D. Data networks and management networks must be in the routing table
Answer: C
NEW QUESTION: 3
You are designing a data processing solution that will run as a Spark job on an HDInsight cluster. The solution will be used to provide near real-time information about online ordering for a retailer.
The solution must include a page on the company intranet that displays summary information.
The summary information page must meet the following requirements:
* Display a summary of sales to date grouped by product categories, price range, and review scope.
* Display sales summary information including total sales, sales as compared to one day ago and sales as compared to one year ago.
* Reflect information for new orders as quickly as possible.
You need to recommend a design for the solution.
What should you recommend? To answer, select the appropriate configuration in the answer area.
Answer:
Explanation:
Explanation:
Box 1: DataFrame
DataFrames
Best choice in most situations.
Provides query optimization through Catalyst.
Whole-stage code generation.
Direct memory access.
Low garbage collection (GC) overhead.
Not as developer-friendly as DataSets, as there are no compile-time checks or domain object programming.
Box 2: parquet
The best format for performance is parquet with snappy compression, which is the default in Spark 2.x. Parquet stores data in columnar format, and is highly optimized in Spark.
Incorrect Answers:
DataSets
Good in complex ETL pipelines where the performance impact is acceptable.
Not good in aggregations where the performance impact can be considerable.
RDDs
You do not need to use RDDs, unless you need to build a new custom RDD.
No query optimization through Catalyst.
No whole-stage code generation.
High GC overhead.
References:
https://docs.microsoft.com/en-us/azure/hdinsight/spark/apache-spark-perf